diff options
Diffstat (limited to 'core/core-engine')
39 files changed, 5365 insertions, 0 deletions
diff --git a/core/core-engine/pom.xml b/core/core-engine/pom.xml new file mode 100644 index 000000000..9b33974ee --- /dev/null +++ b/core/core-engine/pom.xml @@ -0,0 +1,54 @@ +<!-- + ============LICENSE_START======================================================= + Copyright (C) 2018 Ericsson. All rights reserved. + ================================================================================ + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. + + SPDX-License-Identifier: Apache-2.0 + ============LICENSE_END========================================================= +--> +<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" + xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> + <modelVersion>4.0.0</modelVersion> + <parent> + <groupId>org.onap.policy.apex-pdp.core</groupId> + <artifactId>core</artifactId> + <version>2.0.0-SNAPSHOT</version> + </parent> + + <artifactId>core-engine</artifactId> + <name>${project.artifactId}</name> + <description>The Apex policy execution engine</description> + + <dependencies> + <dependency> + <groupId>org.onap.policy.apex-pdp.model</groupId> + <artifactId>policy-model</artifactId> + <version>${project.version}</version> + </dependency> + <dependency> + <groupId>org.onap.policy.apex-pdp.model</groupId> + <artifactId>engine-model</artifactId> + <version>${project.version}</version> + </dependency> + <dependency> + <groupId>org.onap.policy.apex-pdp.context</groupId> + <artifactId>context-management</artifactId> + <version>${project.version}</version> + </dependency> + <dependency> + <groupId>com.google.guava</groupId> + <artifactId>guava</artifactId> + </dependency> + </dependencies> +</project>
\ No newline at end of file diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/EngineParameters.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/EngineParameters.java new file mode 100644 index 000000000..ff616979d --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/EngineParameters.java @@ -0,0 +1,95 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine; + +import java.util.Map; +import java.util.TreeMap; + +import org.onap.policy.apex.context.parameters.ContextParameters; +import org.onap.policy.apex.model.basicmodel.service.AbstractParameters; +import org.onap.policy.apex.model.basicmodel.service.ParameterService; + +/** + * This class holds the parameters for a single Apex engine. This parameter class holds parameters for context schemas + * and context albums for the engine and a map of the logic flavour executors defined for the engine and the parameters + * for each of those executors. + * <p> + * The context parameters for the engine are held in a {@link ContextParameters} instance. This instance holds the + * parameters for context schema handling that will be used by the engine as well as the context album distribution, + * locking, and persistence parameters. + * <p> + * In Apex, an engine can be configured to use many logic flavours. The executors for each logic flavour are identified + * by their name. Each logic flavour executor must have an instance of {@link ExecutorParameters} defined for it, which + * specifies the executor plugins to use for that logic flavour executor and specific parameters for those executor + * plugins. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public class EngineParameters extends AbstractParameters { + private ContextParameters contextParameters = new ContextParameters(); + + // A map of parameters for executors of various logic types + private Map<String, ExecutorParameters> executorParameterMap = new TreeMap<String, ExecutorParameters>(); + + /** + * Constructor to create an engine parameters instance and register the instance with the parameter service. + */ + public EngineParameters() { + super(EngineParameters.class.getCanonicalName()); + ParameterService.registerParameters(EngineParameters.class, this); + } + + /** + * Gets the parameters for context schema and album handling. + * + * @return the parameters for context schema and album handling + */ + public ContextParameters getContextParameters() { + return contextParameters; + } + + /** + * Sets the parameters for context schema and album handling. + * + * @param contextParameters the parameters for context schema and album handling + */ + public void setContextParameters(final ContextParameters contextParameters) { + this.contextParameters = contextParameters; + } + + /** + * Gets the executor parameter map of the engine. + * + * @return the executor parameter map of the engine + */ + public Map<String, ExecutorParameters> getExecutorParameterMap() { + return executorParameterMap; + } + + /** + * Sets the executor parameter map of the engine. + * + * @param executorParameterMap the executor parameter map of the engine + */ + public void setExecutorParameterMap(final Map<String, ExecutorParameters> executorParameterMap) { + this.executorParameterMap = executorParameterMap; + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/ExecutorParameters.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/ExecutorParameters.java new file mode 100644 index 000000000..d3a8ed5ac --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/ExecutorParameters.java @@ -0,0 +1,123 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine; + +import org.onap.policy.apex.model.basicmodel.service.AbstractParameters; +import org.onap.policy.apex.model.basicmodel.service.ParameterService; + +/** + * This class provides the executors for a logic flavour. Plugin classes for execution of task logic, task selection + * logic, and state finalizer logic for the logic flavour must be specified. + * <p> + * Specializations of this class may provide extra parameters for their specific logic flavour executors. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public class ExecutorParameters extends AbstractParameters { + // Executor Plugin classes for executors + private String taskExecutorPluginClass; + private String taskSelectionExecutorPluginClass; + private String stateFinalizerExecutorPluginClass; + + /** + * Constructor to create an executor parameters instance and register the instance with the parameter service. + */ + public ExecutorParameters() { + super(ExecutorParameters.class.getCanonicalName()); + ParameterService.registerParameters(ExecutorParameters.class, this); + } + + /** + * Constructor to create an executor parameters instance with the name of a sub class of this class and register the + * instance with the parameter service. + * + * @param parameterClassName the class name of a sub class of this class + */ + public ExecutorParameters(final String parameterClassName) { + super(parameterClassName); + } + + /** + * Gets the task executor plugin class for the executor. + * + * @return the task executor plugin class for the executor + */ + public String getTaskExecutorPluginClass() { + return taskExecutorPluginClass; + } + + /** + * Sets the task executor plugin class for the executor. + * + * @param taskExecutorPluginClass the task executor plugin class for the executor + */ + public void setTaskExecutorPluginClass(final String taskExecutorPluginClass) { + this.taskExecutorPluginClass = taskExecutorPluginClass; + } + + /** + * Gets the task selection executor plugin class for the executor. + * + * @return the task selection executor plugin class for the executor + */ + public String getTaskSelectionExecutorPluginClass() { + return taskSelectionExecutorPluginClass; + } + + /** + * Sets the task selection executor plugin class for the executor. + * + * @param taskSelectionExecutorPluginClass the task selection executor plugin class for the executor + */ + public void setTaskSelectionExecutorPluginClass(final String taskSelectionExecutorPluginClass) { + this.taskSelectionExecutorPluginClass = taskSelectionExecutorPluginClass; + } + + /** + * Gets the state finalizer executor plugin class for the executor. + * + * @return the state finalizer executor plugin class for the executor + */ + public String getStateFinalizerExecutorPluginClass() { + return stateFinalizerExecutorPluginClass; + } + + /** + * Sets the state finalizer executor plugin class for the executor. + * + * @param stateFinalizerExecutorPluginClass the state finalizer executor plugin class for the executor + */ + public void setStateFinalizerExecutorPluginClass(final String stateFinalizerExecutorPluginClass) { + this.stateFinalizerExecutorPluginClass = stateFinalizerExecutorPluginClass; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.model.basicmodel.service.AbstractParameters#toString() + */ + @Override + public String toString() { + return "ExecutorParameters [taskExecutorPluginClass=" + taskExecutorPluginClass + + ", taskSelectionExecutorPluginClass=" + taskSelectionExecutorPluginClass + + ", StateFinalizerExecutorPluginClass=" + stateFinalizerExecutorPluginClass + "]"; + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/context/ApexInternalContext.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/context/ApexInternalContext.java new file mode 100644 index 000000000..2186ee31d --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/context/ApexInternalContext.java @@ -0,0 +1,232 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.context; + +import com.google.common.collect.Maps; + +import java.util.List; +import java.util.Map; +import java.util.Map.Entry; +import java.util.NavigableMap; +import java.util.Set; +import java.util.TreeMap; + +import org.onap.policy.apex.context.ContextAlbum; +import org.onap.policy.apex.context.ContextException; +import org.onap.policy.apex.context.Distributor; +import org.onap.policy.apex.context.impl.distribution.DistributorFactory; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.basicmodel.concepts.AxConceptGetter; +import org.onap.policy.apex.model.basicmodel.concepts.AxConceptGetterImpl; +import org.onap.policy.apex.model.basicmodel.service.ModelService; +import org.onap.policy.apex.model.contextmodel.concepts.AxContextAlbum; +import org.onap.policy.apex.model.contextmodel.concepts.AxContextAlbums; +import org.onap.policy.apex.model.contextmodel.handling.ContextComparer; +import org.onap.policy.apex.model.policymodel.concepts.AxPolicyModel; +import org.onap.policy.apex.model.utilities.comparison.KeyedMapDifference; + +/** + * This class manages the internal context for an Apex engine. This class is not thread safe and need not be because + * each Context object is owned by one and only one ApexEngine, which runs in a single thread and only runs one policy + * at a time. Therefore there is only ever one policy using a Context object at a time. The currentPolicyContextAlbum is + * set on the Context object by the StateMachineExecutor each time a policy is triggered. + * + * @author Liam Fallon + */ +public final class ApexInternalContext implements AxConceptGetter<ContextAlbum> { + // The key of the currently running Apex model + private final AxArtifactKey key; + + // The context albums being used in this engine + private final NavigableMap<AxArtifactKey, ContextAlbum> contextAlbums = + Maps.synchronizedNavigableMap(new TreeMap<AxArtifactKey, ContextAlbum>()); + + // The internal context uses a context distributor to handle distribution of context across multiple instances + private Distributor contextDistributor = null; + + // The key of the current policy, used to return the correct policy context album to the user + private final AxArtifactKey currentPolicyKey = null; + + /** + * Constructor, instantiate the context object from the Apex model. + * + * @param apexPolicyModel the apex model + * @throws ContextException On errors on context setting + */ + public ApexInternalContext(final AxPolicyModel apexPolicyModel) throws ContextException { + apexPolicyModel.register(); + + // The context distributor used to distribute context across policy engine instances + contextDistributor = new DistributorFactory().getDistributor(apexPolicyModel.getKey()); + + // Set up the context albums for this engine + for (final AxArtifactKey contextAlbumKey : ModelService.getModel(AxContextAlbums.class).getAlbumsMap() + .keySet()) { + contextAlbums.put(contextAlbumKey, contextDistributor.createContextAlbum(contextAlbumKey)); + } + + // Record the key of the current model + key = apexPolicyModel.getKey(); + } + + /** + * Get the key of the internal context, which is the same as the key of the engine. + * + * @return the key + */ + public AxArtifactKey getKey() { + return key; + } + + /** + * Get the context albums of the engine. + * + * @return the context albums + */ + public Map<AxArtifactKey, ContextAlbum> getContextAlbums() { + return contextAlbums; + } + + /** + * Update the current context so that it aligns with this incoming model, transferring context values if they exist + * in the new model. + * + * @param newPolicyModel The new incoming Apex model to use for context + * @throws ContextException On errors on context setting + */ + public void update(final AxPolicyModel newPolicyModel) throws ContextException { + if (newPolicyModel == null) { + throw new ContextException("internal context update failed, supplied model is null"); + } + + // Get the differences between the existing context and the new context + final KeyedMapDifference<AxArtifactKey, AxContextAlbum> contextDifference = + new ContextComparer().compare(ModelService.getModel(AxContextAlbums.class), newPolicyModel.getAlbums()); + + // Remove maps that are no longer used + for (final Entry<AxArtifactKey, AxContextAlbum> removedContextAlbumEntry : contextDifference.getLeftOnly() + .entrySet()) { + contextDistributor.removeContextAlbum(removedContextAlbumEntry.getValue()); + contextAlbums.remove(removedContextAlbumEntry.getKey()); + } + + // We switch over to the new Apex model + newPolicyModel.register(); + + // Set up the new context albums + for (final AxArtifactKey contextAlbumKey : contextDifference.getRightOnly().keySet()) { + contextAlbums.put(contextAlbumKey, contextDistributor.createContextAlbum(contextAlbumKey)); + } + + // Handle the updated maps + for (final Entry<AxArtifactKey, List<AxContextAlbum>> contextAlbumEntry : contextDifference.getDifferentValues() + .entrySet()) { + // Compare the updated maps + final AxContextAlbum currentContextAlbum = contextAlbumEntry.getValue().get(0); + final AxContextAlbum newContextAlbum = contextAlbumEntry.getValue().get(1); + + // Check that the schemas are the same on the old and new context albums + if (currentContextAlbum.getItemSchema().equals(newContextAlbum.getItemSchema())) { + // The schema is different, throw an exception because the schema should not change if the key of the + // album has not changed + throw new ContextException("internal context update failed on context album \"" + + contextAlbumEntry.getKey().getID() + "\" in model \"" + key.getID() + "\", schema \"" + + currentContextAlbum.getItemSchema().getID() + + "\" on existing context model does not equal schema \"" + + newContextAlbum.getItemSchema().getID() + "\" on incoming model"); + } + } + + } + + /** + * Clear the internal context. + * + * @throws ContextException on clearing errors + */ + public void clear() throws ContextException { + // Clear all context in the distributor + contextDistributor.clear(); + } + + /* + * (non-Javadoc) + * + * @see java.lang.Object#toString() + */ + @Override + public String toString() { + return "ApexInternalContext [contextAlbums=" + contextAlbums + ", contextDistributor=" + contextDistributor + + ", currentPolicyKey=" + currentPolicyKey + "]"; + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.basicmodel.concepts.AxConceptGetter#get(org.onap.policy.apex.core.basicmodel.concepts. + * AxArtifactKey) + */ + @Override + public ContextAlbum get(final AxArtifactKey conceptKey) { + return new AxConceptGetterImpl<>(contextAlbums).get(conceptKey); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.basicmodel.concepts.AxConceptGetter#get(java.lang.String) + */ + @Override + public ContextAlbum get(final String conceptKeyName) { + return new AxConceptGetterImpl<>(contextAlbums).get(conceptKeyName); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.basicmodel.concepts.AxConceptGetter#get(java.lang.String, java.lang.String) + */ + @Override + public ContextAlbum get(final String conceptKeyName, final String conceptKeyVersion) { + return new AxConceptGetterImpl<>(contextAlbums).get(conceptKeyName, conceptKeyVersion); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.basicmodel.concepts.AxConceptGetter#getAll(java.lang.String) + */ + @Override + public Set<ContextAlbum> getAll(final String conceptKeyName) { + return new AxConceptGetterImpl<>(contextAlbums).getAll(conceptKeyName); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.basicmodel.concepts.AxConceptGetter#getAll(java.lang.String, java.lang.String) + */ + @Override + public Set<ContextAlbum> getAll(final String conceptKeyName, final String conceptKeyVersion) { + return new AxConceptGetterImpl<>(contextAlbums).getAll(conceptKeyName, conceptKeyVersion); + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/context/package-info.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/context/package-info.java new file mode 100644 index 000000000..887914ee0 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/context/package-info.java @@ -0,0 +1,28 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +/** + * Manages the context albums that an APEX engine requires during execution. It uses the policy model of the engine to + * determine what context albums the engine requires. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ + +package org.onap.policy.apex.core.engine.context; diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/ApexEngine.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/ApexEngine.java new file mode 100644 index 000000000..9e27e5e86 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/ApexEngine.java @@ -0,0 +1,144 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.engine; + +import java.util.Map; + +import org.onap.policy.apex.core.engine.event.EnEvent; +import org.onap.policy.apex.model.basicmodel.concepts.ApexException; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.enginemodel.concepts.AxEngineModel; +import org.onap.policy.apex.model.enginemodel.concepts.AxEngineState; +import org.onap.policy.apex.model.policymodel.concepts.AxPolicyModel; + +/** + * The Interface ApexEngine is used to control the execution of a single Apex engine thread. This engine instance + * executes the policies in an {@link AxPolicyModel}, which defines the policies that are executed by the engine and the + * context in which they execute. Many instances of an Apex engine may run on the same Apex model, in which case they + * operate the same policy set in parallel over the same context. When the {@code handleEvent} method is passed to the + * Apex engine, the engine executes the policy triggered by that event. A single Apex engine instance does not executed + * multiple policies in parallel, it receives a trigger event and executes the policy for that event to completion + * before it is available to execute another policy. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public interface ApexEngine { + /** + * The amount of milliseconds to wait for the current Apex engine to timeout on engine stop requests. If the timeout + * is exceeded, the stop aborts. + */ + int APEX_ENGINE_STOP_EXECUTION_WAIT_TIMEOUT = 3000; + + /** The wait increment (or pause time) when waiting for the Apex engine to stop. */ + int APEX_ENGINE_STOP_EXECUTION_WAIT_INCREMENT = 100; + + /** + * Update the Apex model to be used by the Apex engine. The engine must be in state "STOPPED" when the model is + * updated. The engine will replace the current model with the incoming model if the model of the engine was + * previously updated and the value of common context is transferred if there is common context in the old and new + * models. + * + * @param apexModel the apex model + * @throws ApexException on model update errors + */ + void updateModel(AxPolicyModel apexModel) throws ApexException; + + /** + * Starts an Apex engine so that it can receive events. + * + * @throws ApexException on start errors + */ + void start() throws ApexException; + + /** + * Stops an Apex engine in an orderly way. This method must be called prior to model updates. + * + * @throws ApexException on stop errors + */ + void stop() throws ApexException; + + /** + * Clears all models and data from an Apex engine. The engine must be stopped. + * + * @throws ApexException on clear errors + */ + void clear() throws ApexException; + + /** + * This method constructs an event with the correct event context so that it can later be sent to the Apex engine. + * + * @param eventKey The key of the event in the Apex model + * @return the created event + */ + EnEvent createEvent(AxArtifactKey eventKey); + + /** + * This method passes an event to the Apex model to invoke a policy. If the event matches a policy, then that policy + * is executed. + * + * @return return true if a policy was invoked without error, otherwise false. + * @param incomingEvent the incoming event + */ + boolean handleEvent(EnEvent incomingEvent); + + /** + * A method to add a call back listener class that listens for action events from the engine. + * + * @param listenerName the unique name of the listener + * @param listener is an instance of type {@link EnEventListener} + */ + void addEventListener(String listenerName, EnEventListener listener); + + /** + * A method to remove a call back listener class. + * + * @param listenerName the name of the listener to remove + */ + void removeEventListener(String listenerName); + + /** + * Get the artifact key of the engine. + * + * @return the artifact key + */ + AxArtifactKey getKey(); + + /** + * Get the state of the engine. + * + * @return the engine state + */ + AxEngineState getState(); + + /** + * Get the engine status information, this is just the engine state. + * + * @return the Apex status information + */ + AxEngineModel getEngineStatus(); + + /** + * Get the engine run time information, the status and context. + * + * @return the Apex runtime information + */ + Map<AxArtifactKey, Map<String, Object>> getEngineContext(); +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/EnEventListener.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/EnEventListener.java new file mode 100644 index 000000000..32d638aef --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/EnEventListener.java @@ -0,0 +1,41 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.engine; + +import org.onap.policy.apex.core.engine.event.EnEvent; +import org.onap.policy.apex.model.basicmodel.concepts.ApexException; + +/** + * This interface is used by users of an Apex engine to receive action events being emitted by the engine. + * + * @author Liam Fallon + * + */ +public interface EnEventListener { + + /** + * This method is called when an Apex engine emits an event. + * + * @param enEvent the engine event + * @throws ApexException the apex exception + */ + void onEnEvent(EnEvent enEvent) throws ApexException; +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineFactory.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineFactory.java new file mode 100644 index 000000000..4920486de --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineFactory.java @@ -0,0 +1,43 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.engine.impl; + +import org.onap.policy.apex.core.engine.engine.ApexEngine; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; + +/** + * A factory class to create APEX engines of a given type. As there is only a single type of Apex engine in existence, + * this class is trivial. + * + * @author Liam Fallon + */ +public class ApexEngineFactory { + + /** + * Create an Apex engine implementation. + * + * @param key the key + * @return the apex engine + */ + public ApexEngine createApexEngine(final AxArtifactKey key) { + return new ApexEngineImpl(key); + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineImpl.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineImpl.java new file mode 100644 index 000000000..12ba76afb --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineImpl.java @@ -0,0 +1,451 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.engine.impl; + +import static org.onap.policy.apex.model.utilities.Assertions.argumentNotNull; + +import java.util.LinkedHashMap; +import java.util.Map; +import java.util.Map.Entry; + +import org.onap.policy.apex.context.ContextAlbum; +import org.onap.policy.apex.context.ContextException; +import org.onap.policy.apex.core.engine.context.ApexInternalContext; +import org.onap.policy.apex.core.engine.engine.ApexEngine; +import org.onap.policy.apex.core.engine.engine.EnEventListener; +import org.onap.policy.apex.core.engine.event.EnEvent; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineException; +import org.onap.policy.apex.model.basicmodel.concepts.ApexException; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey; +import org.onap.policy.apex.model.enginemodel.concepts.AxEngineModel; +import org.onap.policy.apex.model.enginemodel.concepts.AxEngineState; +import org.onap.policy.apex.model.enginemodel.concepts.AxEngineStats; +import org.onap.policy.apex.model.policymodel.concepts.AxPolicyModel; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * This class controls the thread of execution of a single engine in an Apex system. An engine is a single thread in a + * pool of engines that are running a set of policies. An engine is either inactive, waiting for a policy to be + * triggered or executing a policy. The engine runs off a queue of triggers that trigger its state machine. If the queue + * is empty, it waits for the next trigger. The Apex engine holds its state machine in a {@link StateMachineHandler} + * instance and uses its state machine handler to execute events. + * + * @author Liam Fallon + */ +public class ApexEngineImpl implements ApexEngine { + // Logger for this class + private static final XLogger LOGGER = XLoggerFactory.getXLogger(ApexEngineImpl.class); + + // The artifact key of this engine + private final AxArtifactKey key; + + // The state of this engine + private AxEngineState state = AxEngineState.STOPPED; + + // call back listeners + private final Map<String, EnEventListener> eventListeners = new LinkedHashMap<String, EnEventListener>(); + + // The context of this engine + private ApexInternalContext internalContext = null; + + // The state machines + private StateMachineHandler stateMachineHandler = null; + + // Statistics on engine execution + private final AxEngineStats engineStats; + + /** + * Constructor, instantiate the engine with its state machine table. + * + * @param key the key of the engine + */ + protected ApexEngineImpl(final AxArtifactKey key) { + argumentNotNull(key, "AxArtifactKey may not be null"); + + LOGGER.entry("ApexEngine()->" + key.getID() + "," + state); + + this.key = key; + + // Set up statistics collection + engineStats = new AxEngineStats(); + engineStats.setKey(new AxReferenceKey(key, "_EngineStats")); + + LOGGER.exit("ApexEngine()<-" + key.getID() + "," + state); + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.engine.ApexEngine#updateModel(org.onap.policy.apex.model.policymodel.concepts. + * AxPolicyModel) + */ + @Override + public void updateModel(final AxPolicyModel apexModel) throws ApexException { + if (apexModel != null) { + LOGGER.entry("updateModel()->" + key.getID() + ", apexPolicyModel=" + apexModel.getKey().getID()); + } else { + LOGGER.warn("updateModel()<-" + key.getID() + ", Apex model not set"); + throw new ApexException( + "updateModel()<-" + key.getID() + ", Apex model is not defined, it has a null value"); + } + + // The engine must be stopped in order to do a model update + if (!state.equals(AxEngineState.STOPPED)) { + throw new ApexException("updateModel()<-" + key.getID() + + ", cannot update model, engine should be stopped but is in state " + state); + } + + // Create new internal context or update the existing one + try { + if (internalContext == null) { + /// New internal context + internalContext = new ApexInternalContext(apexModel); + } else { + // Exiting internal context which must be updated + internalContext.update(apexModel); + } + } catch (final ContextException e) { + LOGGER.warn( + "updateModel()<-" + key.getID() + ", error setting the context for engine \"" + key.getID() + "\"", + e); + throw new ApexException( + "updateModel()<-" + key.getID() + ", error setting the context for engine \"" + key.getID() + "\"", + e); + } + + // Set up the state machines + try { + // We always set up state machines as new because it's only context that must be transferred; policies are + // always set up as new + stateMachineHandler = new StateMachineHandler(internalContext); + } catch (final StateMachineException e) { + LOGGER.warn("updateModel()<-" + key.getID() + ", error setting up the engine state machines \"" + + key.getID() + "\"", e); + throw new ApexException("updateModel()<-" + key.getID() + ", error setting up the engine state machines \"" + + key.getID() + "\"", e); + } + + LOGGER.exit("updateModel()<-" + key.getID()); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.engine.ApexEngine#start() + */ + @Override + public void start() throws ApexException { + LOGGER.entry("start()" + key); + + if (state != AxEngineState.STOPPED) { + LOGGER.warn("start()<-" + key.getID() + "," + state + ", cannot start engine, engine not in state STOPPED"); + throw new ApexException( + "start()<-" + key.getID() + "," + state + ", cannot start engine, engine not in state STOPPED"); + } + + if (stateMachineHandler == null || internalContext == null) { + LOGGER.warn("start()<-" + key.getID() + "," + state + + ", cannot start engine, engine has not been initialized, its model is not loaded"); + throw new ApexException("start()<-" + key.getID() + "," + state + + ", cannot start engine, engine has not been initialized, its model is not loaded"); + } + + // Set up the state machines + try { + // Start the state machines + stateMachineHandler.start(); + engineStats.engineStart(); + } catch (final StateMachineException e) { + LOGGER.warn("updateModel()<-" + key.getID() + ", error starting the engine state machines \"" + key.getID() + + "\"", e); + throw new ApexException("updateModel()<-" + key.getID() + ", error starting the engine state machines \"" + + key.getID() + "\"", e); + } + + // OK, we are good to go + state = AxEngineState.READY; + + LOGGER.exit("start()" + key); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.engine.ApexEngine#stop() + */ + @Override + public void stop() throws ApexException { + LOGGER.entry("stop()->" + key); + + // Stop the engine if it is in state READY, if it is in state EXECUTING, wait for execution to finish + for (int increment = APEX_ENGINE_STOP_EXECUTION_WAIT_TIMEOUT; increment > 0; increment = + APEX_ENGINE_STOP_EXECUTION_WAIT_INCREMENT) { + synchronized (state) { + switch (state) { + // Already stopped + case STOPPED: + + throw new ApexException("stop()<-" + key.getID() + "," + state + + ", cannot stop engine, engine is already stopped"); + // The normal case, the engine wasn't doing anything or it was executing + case READY: + case STOPPING: + + state = AxEngineState.STOPPED; + stateMachineHandler.stop(); + engineStats.engineStop(); + LOGGER.exit("stop()" + key); + return; + // Engine is executing a policy, wait for it to stop + case EXECUTING: + state = AxEngineState.STOPPING; + break; + default: + throw new ApexException("stop()<-" + key.getID() + "," + state + + ", cannot stop engine, engine is in an undefined state"); + } + } + } + + throw new ApexException("stop()<-" + key.getID() + "," + state + ", cannot stop engine, engine stop timed out"); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.engine.ApexEngine#clear() + */ + @Override + public void clear() throws ApexException { + LOGGER.entry("clear()->" + key); + if (state != AxEngineState.STOPPED) { + throw new ApexException( + "clear" + "()<-" + key.getID() + "," + state + ", cannot clear engine, engine is not stopped"); + } + + // Clear everything + stateMachineHandler = null; + engineStats.clean(); + internalContext.clear(); + internalContext = null; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.engine.ApexEngine#createEvent(org.onap.policy.apex.core.model.concepts. + * AxArtifactKey) + */ + @Override + public EnEvent createEvent(final AxArtifactKey eventKey) { + if (state != AxEngineState.READY && state != AxEngineState.EXECUTING) { + LOGGER.warn( + "createEvent()<-" + key.getID() + "," + state + ", cannot create event, engine not in state READY"); + return null; + } + + try { + // Create an event using the internal context + return new EnEvent(eventKey); + } catch (final Exception e) { + LOGGER.warn("createEvent()<-" + key.getID() + "," + state + ", error on event creation", e); + return null; + } + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.engine.ApexEngine#handleEvent(org.onap.policy.apex.core.engine.event.EnEvent) + */ + @Override + public boolean handleEvent(final EnEvent incomingEvent) { + boolean ret = false; + if (incomingEvent == null) { + LOGGER.warn("handleEvent()<-" + key.getID() + "," + state + ", cannot run engine, incoming event is null"); + return ret; + } + + synchronized (state) { + if (state != AxEngineState.READY) { + LOGGER.warn("handleEvent()<-" + key.getID() + "," + state + + ", cannot run engine, engine not in state READY"); + return ret; + } + + state = AxEngineState.EXECUTING; + } + + LOGGER.debug("execute(): triggered by event " + incomingEvent.toString()); + + // By default we return a null event on errors + EnEvent outgoingEvent = null; + try { + engineStats.executionEnter(incomingEvent.getKey()); + outgoingEvent = stateMachineHandler.execute(incomingEvent); + engineStats.executionExit(); + ret = true; + } catch (final StateMachineException e) { + LOGGER.warn("handleEvent()<-" + key.getID() + "," + state + ", engine execution error: ", e); + + // Create an exception return event + outgoingEvent = createExceptionEvent(incomingEvent, e); + } + + // Publish the outgoing event + try { + synchronized (eventListeners) { + if (eventListeners.isEmpty()) { + LOGGER.debug("handleEvent()<-" + key.getID() + "," + state + + ", There is no listener registered to recieve outgoing event: " + outgoingEvent); + } + for (final EnEventListener axEventListener : eventListeners.values()) { + axEventListener.onEnEvent(outgoingEvent); + } + } + } catch (final ApexException e) { + LOGGER.warn("handleEvent()<-" + key.getID() + "," + state + ", outgoing event publishing error: ", e); + ret = false; + } + synchronized (state) { + // Only go to READY if we are still in state EXECUTING, we could be in state STOPPING + if (state == AxEngineState.EXECUTING) { + state = AxEngineState.READY; + } + } + return ret; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.engine.ApexEngine#addEventListener(java.lang.String, + * org.onap.policy.apex.core.engine.engine.EnEventListener) + */ + @Override + public void addEventListener(final String listenerName, final EnEventListener listener) { + eventListeners.put(listenerName, listener); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.engine.ApexEngine#removeEventListener(java.lang.String) + */ + @Override + public void removeEventListener(final String listenerName) { + eventListeners.remove(listenerName); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.engine.ApexEngine#getKey() + */ + @Override + public AxArtifactKey getKey() { + return key; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.engine.ApexEngine#getState() + */ + @Override + public final AxEngineState getState() { + return state; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.engine.ApexEngine#getEngineStatus() + */ + @Override + public AxEngineModel getEngineStatus() { + final AxEngineModel engineModel = new AxEngineModel(key); + engineModel.setTimestamp(System.currentTimeMillis()); + engineModel.setState(state); + engineModel.setStats(engineStats); + return engineModel; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.engine.ApexEngine#getEngineRuntime() + */ + @Override + public Map<AxArtifactKey, Map<String, Object>> getEngineContext() { + final Map<AxArtifactKey, Map<String, Object>> currentContext = + new LinkedHashMap<AxArtifactKey, Map<String, Object>>(); + + for (final Entry<AxArtifactKey, ContextAlbum> contextAlbumEntry : internalContext.getContextAlbums() + .entrySet()) { + currentContext.put(contextAlbumEntry.getKey(), contextAlbumEntry.getValue()); + } + + return currentContext; + } + + /** + * Get the internal context for the Apex engine. + * + * @return The Apex Internal Context + */ + public ApexInternalContext getInternalContext() { + return internalContext; + } + + /** + * Create an exception event from the incoming event including the exception information on the event. + * + * @param incomingEvent The incoming event that caused the exception + * @param eventException The exception that was thrown + * @return the exception event + */ + private EnEvent createExceptionEvent(final EnEvent incomingEvent, final Exception eventException) { + // The exception event is a clone of the incoming event with the exception suffix added to its name and an extra + // field "ExceptionMessage" added + final EnEvent exceptionEvent = (EnEvent) incomingEvent.clone(); + + // Create the cascaded message string + final StringBuilder exceptionMessageStringBuilder = new StringBuilder(); + exceptionMessageStringBuilder.append(eventException.getMessage()); + + Throwable subException = eventException.getCause(); + while (subException != null) { + exceptionMessageStringBuilder.append("\ncaused by: "); + exceptionMessageStringBuilder.append(subException.getMessage()); + subException = subException.getCause(); + } + + // Set the exception message on the event + exceptionEvent.setExceptionMessage(exceptionMessageStringBuilder.toString()); + + return exceptionEvent; + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/StateMachineHandler.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/StateMachineHandler.java new file mode 100644 index 000000000..856136bab --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/StateMachineHandler.java @@ -0,0 +1,186 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.engine.impl; + +import java.util.HashMap; + +import org.onap.policy.apex.core.engine.context.ApexInternalContext; +import org.onap.policy.apex.core.engine.event.EnEvent; +import org.onap.policy.apex.core.engine.executor.ExecutorFactory; +import org.onap.policy.apex.core.engine.executor.StateMachineExecutor; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineException; +import org.onap.policy.apex.core.engine.executor.impl.ExecutorFactoryImpl; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.basicmodel.service.ModelService; +import org.onap.policy.apex.model.eventmodel.concepts.AxEvent; +import org.onap.policy.apex.model.eventmodel.concepts.AxEvents; +import org.onap.policy.apex.model.policymodel.concepts.AxPolicies; +import org.onap.policy.apex.model.policymodel.concepts.AxPolicy; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * This handler holds and manages state machines for each policy in an Apex engine. When the class is instantiated, an + * executor {@link StateMachineExecutor} is created for each policy in the policy model the state machine handler will + * execute. The executors for each policy are held in a map indexed by event. + * <p> + * When an event is received on the policy, the state machine executor to execute that event is looked up on the + * executor map and the event is passed to the executor for execution. + * + * @author Liam Fallon + * + */ +public class StateMachineHandler { + // Logger for this class + private static final XLogger LOGGER = XLoggerFactory.getXLogger(StateMachineHandler.class); + + // The key of the Apex model we are executing + private final AxArtifactKey key; + + // The state machines in this engine + private final HashMap<AxEvent, StateMachineExecutor> stateMachineExecutorMap = new HashMap<>(); + + // The executor factory is used to get logic executors for the particular type of executor we need for task + // selection logic or task logic + private final ExecutorFactory executorFactory; + + /** + * This constructor builds the state machines for the policies in the apex model. + * + * @param internalContext The internal context we are using + * @throws StateMachineException On state machine initiation errors + */ + protected StateMachineHandler(final ApexInternalContext internalContext) throws StateMachineException { + LOGGER.entry("StateMachineHandler()->" + internalContext.getKey().getID()); + + key = internalContext.getKey(); + + // Create the executor factory to generate executors as the engine runs policies + executorFactory = new ExecutorFactoryImpl(); + + // Iterate over the policies in the policy model and create a state machine for each one + for (final AxPolicy policy : ModelService.getModel(AxPolicies.class).getPolicyMap().values()) { + // Create a state machine for this policy + final StateMachineExecutor thisStateMachineExecutor = + new StateMachineExecutor(executorFactory, policy.getKey()); + + // This executor is the top executor so has no parent + thisStateMachineExecutor.setContext(null, policy, internalContext); + + // Get the incoming trigger event + final AxEvent triggerEvent = ModelService.getModel(AxEvents.class) + .get(policy.getStateMap().get(policy.getFirstState()).getTrigger()); + + // Put the state machine executor on the map for this trigger + final StateMachineExecutor lastStateMachineExecutor = + stateMachineExecutorMap.put(triggerEvent, thisStateMachineExecutor); + if (lastStateMachineExecutor != null + && lastStateMachineExecutor.getSubject() != thisStateMachineExecutor.getSubject()) { + LOGGER.error("No more than one policy in a model can have the same trigger event. In model " + + internalContext.getKey().getID() + " Policy (" + + lastStateMachineExecutor.getSubject().getKey().getID() + ") and Policy (" + + thisStateMachineExecutor.getSubject().getKey().getID() + ") have the same Trigger event (" + + triggerEvent.getKey().getID() + ") "); + LOGGER.error(" Policy (" + lastStateMachineExecutor.getSubject().getKey() + ") has overwritten Policy (" + + thisStateMachineExecutor.getSubject().getKey().getID() + + " so this overwritten policy will never be triggered in this engine."); + } + } + + LOGGER.exit("StateMachineHandler()<-" + internalContext.getKey().getID()); + } + + /** + * This constructor starts the state machines for each policy, carrying out whatever initialization executors need. + * + * @throws StateMachineException On state machine initiation errors + */ + protected void start() throws StateMachineException { + LOGGER.entry("start()->" + key.getID()); + + // Iterate over the state machines + for (final StateMachineExecutor smExecutor : stateMachineExecutorMap.values()) { + try { + smExecutor.prepare(); + } catch (final StateMachineException e) { + final String stateMachineID = smExecutor.getContext().getKey().getID(); + LOGGER.warn("start()<-" + key.getID() + ", start failed, state machine \"" + stateMachineID + "\"", e); + throw new StateMachineException( + "start()<-" + key.getID() + ", start failed, state machine \"" + stateMachineID + "\"", e); + } + } + + LOGGER.exit("start()<-" + key.getID()); + } + + /** + * This method is called to execute an event on the state machines in an engine. + * + * @param event The trigger event for the state machine + * @return The result of the state machine execution run + * @throws StateMachineException On execution errors in a state machine + */ + protected EnEvent execute(final EnEvent event) throws StateMachineException { + LOGGER.entry("execute()->" + event.getName()); + + // Try to execute the state machine for the trigger + final StateMachineExecutor stateMachineExecutor = stateMachineExecutorMap.get(event.getAxEvent()); + if (stateMachineExecutor == null) { + final String exceptionMessage = + "state machine execution not possible, policy not found for trigger event " + event.getName(); + LOGGER.warn(exceptionMessage); + + event.setExceptionMessage(exceptionMessage); + return event; + } + + // Run the state machine + try { + LOGGER.debug("execute(): state machine \"{}\" execution starting . . .", stateMachineExecutor); + final EnEvent outputObject = stateMachineExecutor.execute(event.getExecutionID(), event); + + LOGGER.debug("execute()<-: state machine \"{}\" execution completed", stateMachineExecutor); + return outputObject; + } catch (final Exception e) { + LOGGER.warn("execute()<-: state machine \"" + stateMachineExecutor + "\" execution failed", e); + throw new StateMachineException("execute()<-: execution failed on state machine " + stateMachineExecutor, + e); + } + } + + /** + * Closes down the state machines of an engine. + */ + protected void stop() { + LOGGER.entry("stop()->"); + + // Iterate through all state machines and clean them + for (final StateMachineExecutor smExecutor : stateMachineExecutorMap.values()) { + try { + smExecutor.cleanUp(); + } catch (final StateMachineException e) { + final String smID = smExecutor.getContext().getKey().getID(); + LOGGER.warn("stop()<-clean up failed, state machine \"" + smID + "\" cleanup failed", e); + } + } + LOGGER.exit("stop()<-"); + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/package-info.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/package-info.java new file mode 100644 index 000000000..ce86e2745 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/package-info.java @@ -0,0 +1,27 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +/** + * Provides the implementation of the {@link org.onap.policy.apex.core.engine.engine.ApexEngine} interface. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ + +package org.onap.policy.apex.core.engine.engine.impl; diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/package-info.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/package-info.java new file mode 100644 index 000000000..5c99f917e --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/package-info.java @@ -0,0 +1,30 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +/** + * Defines the Apex engine Java API. The API is used to set up, control, send events to, and receive events from an APEX + * engine. The {@link ApexEngine} interface is used to control the execution of a single APEX engine thread and to send + * events to that APEX engine thread. The {@link EnEventListener} interface is used to listen for events being emitted + * by an APEX engine thread. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ + +package org.onap.policy.apex.core.engine.engine; diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/event/EnEvent.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/event/EnEvent.java new file mode 100644 index 000000000..b072a89d0 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/event/EnEvent.java @@ -0,0 +1,338 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.event; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collection; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Map; +import java.util.Random; +import java.util.Set; + +import org.onap.policy.apex.core.engine.monitoring.EventMonitor; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.basicmodel.concepts.AxConcept; +import org.onap.policy.apex.model.basicmodel.service.ModelService; +import org.onap.policy.apex.model.eventmodel.concepts.AxEvent; +import org.onap.policy.apex.model.eventmodel.concepts.AxEvents; +import org.onap.policy.apex.model.eventmodel.concepts.AxField; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * Instances of the Class EnEvent are events being passed through the Apex system. All events in the system are + * instances of this class. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public class EnEvent extends HashMap<String, Object> { + private static final long serialVersionUID = 6311863111866294637L; + + // Logger for this class + private static final XLogger LOGGER = XLoggerFactory.getXLogger(EnEvent.class); + + // The definition of this event in the Apex model + private final AxEvent axEvent; + + // The event monitor for this event + private final EventMonitor eventMonitor = new EventMonitor(); + + // The stack of execution of this event, used for monitoring + private AxConcept[] userArtifactStack; + + private static Random rand = new Random(System.nanoTime()); + + // An identifier for the current event execution. The default value here will always be a random number, and should + // be reset + private long executionID = rand.nextLong(); + + // A string holding a message that indicates why processing of this event threw an exception + private String exceptionMessage; + + /** + * Instantiates a new EnEvent, an Engine Event. + * + * @param eventKey the key of the event definition from the Apex model + */ + public EnEvent(final AxArtifactKey eventKey) { + this(ModelService.getModel(AxEvents.class).get(eventKey)); + } + + /** + * Instantiates a new EnEvent, an Engine Event. + * + * @param axEvent the event definition from the Apex model + */ + public EnEvent(final AxEvent axEvent) { + super(); + // Save the event definition from the Apex model + this.axEvent = axEvent; + } + + /** + * Gets the event definition of this event. + * + * @return the event definition + */ + public AxEvent getAxEvent() { + return axEvent; + } + + /** + * Get the name of the event. + * + * @return the event name + */ + public String getName() { + return axEvent.getKey().getName(); + } + + /** + * Get the key of the event. + * + * @return the event key + */ + public AxArtifactKey getKey() { + return axEvent.getKey(); + } + + /** + * Get the ID of the event. + * + * @return the event key + */ + public String getID() { + return axEvent.getKey().getID(); + } + + /** + * Get the currently set value for the ExecutionID for this event. A ExecutionID in an EnEvent is used identify all + * EnEvents (input, internal and output events) used in a single Engine invocation. Therefore, a ExecutionID can be + * used to match which output event is the result of a particular input event. The default initialized value for the + * ExecutionID is always unique in a single JVM. + * + * @return the currently set value for the ExecutionID for this event. + */ + public long getExecutionID() { + return executionID; + } + + /** + * Set the value for the ExecutionID for this event. A ExecutionID in an EnEvent is used identify all EnEvents + * (input, internal and output events) used in a single Engine invocation. Therefore, a ExecutionID can be used to + * match which output event is the result of a particular input event. The default initialised value for the + * ExecutionID is always unique in a single JVM. + * + * @param executionID the new value for the ExecutionID for this event. + */ + public void setExecutionID(final long executionID) { + this.executionID = executionID; + } + + /** + * Gets the exception message explaining why processing of this event to fail. + * + * @return the exception message + */ + public String getExceptionMessage() { + return exceptionMessage; + } + + /** + * Sets the exception message explaining why processing of this event to fail. + * + * @param exceptionMessage the exception message + */ + public void setExceptionMessage(final String exceptionMessage) { + this.exceptionMessage = exceptionMessage; + } + + /** + * Store the user artifact stack of the event. + * + * @param usedArtifactStackArray the event user artifact stack + */ + public void setUserArtifactStack(final AxConcept[] usedArtifactStackArray) { + userArtifactStack = usedArtifactStackArray; + } + + /* + * (non-Javadoc) + * + * @see java.util.Map#get(java.lang.Object) + */ + @Override + public Object get(final Object key) { + if (key == null) { + LOGGER.warn("null values are illegal on method parameter \"key\""); + throw new EnException("null values are illegal on method parameter \"key\""); + } + + // Check if this key is a parameter on our event + final AxField eventParameter = axEvent.getParameterMap().get(key); + if (eventParameter == null) { + LOGGER.warn("parameter with key " + key + " not defined on this event"); + throw new EnException("parameter with key " + key + " not defined on this event"); + } + + // Get the item + final Object item = super.get(key); + + // Get the parameter value and monitor it + eventMonitor.monitorGet(eventParameter, item, userArtifactStack); + return item; + } + + /* + * (non-Javadoc) + * + * @see java.util.Map#values() + */ + @Override + public Collection<Object> values() { + // Build the key set and return it + final ArrayList<Object> valueList = new ArrayList<>(); + + // Override the generic "values()" call as we want to monitor the gets + for (final String key : super.keySet()) { + valueList.add(this.get(key)); + } + + return valueList; + } + + /* + * (non-Javadoc) + * + * @see java.util.Map#entrySet() + */ + @Override + public Set<Map.Entry<String, Object>> entrySet() { + // Build the entry set and return it + final Set<Map.Entry<String, Object>> entrySet = new HashSet<>(); + + // Override the generic "entrySet()" call as we want to monitor the gets + for (final String key : super.keySet()) { + entrySet.add(new SimpleEntry<>(key, this.get(key))); + } + + return entrySet; + } + + /* + * (non-Javadoc) + * + * @see java.util.Map#put(java.lang.Object, java.lang.Object) + */ + @Override + public Object put(final String key, final Object incomingValue) { + if (key == null) { + LOGGER.warn("null keys are illegal on method parameter \"key\""); + throw new EnException("null keys are illegal on method parameter \"key\""); + } + + // Check if this key is a parameter on our event + final AxField eventParameter = axEvent.getParameterMap().get(key); + if (eventParameter == null) { + LOGGER.warn("parameter with key \"" + key + "\" not defined on event \"" + getName() + "\""); + throw new EnException("parameter with key \"" + key + "\" not defined on event \"" + getName() + "\""); + } + + // We allow null values + if (incomingValue == null) { + eventMonitor.monitorSet(eventParameter, incomingValue, userArtifactStack); + return super.put(key, incomingValue); + } + + // Holder for the object to assign + final Object valueToAssign = new EnField(eventParameter, incomingValue).getAssignableValue(); + + // Update the value in the parameter map + eventMonitor.monitorSet(eventParameter, valueToAssign, userArtifactStack); + return super.put(key, valueToAssign); + } + + /* + * (non-Javadoc) + * + * @see java.util.Map#putAll(java.util.Map) + */ + @Override + public void putAll(final Map<? extends String, ? extends Object> incomingMap) { + // Override the generic "putAll()" call as we want to monitor the puts + for (final java.util.Map.Entry<? extends String, ? extends Object> incomingEntry : incomingMap.entrySet()) { + put(incomingEntry.getKey(), incomingEntry.getValue()); + } + } + + /* + * (non-Javadoc) + * + * @see java.util.Map#remove(java.lang.Object) + */ + @Override + public Object remove(final Object key) { + if (key == null) { + LOGGER.warn("null keys are illegal on method parameter \"key\""); + throw new EnException("null keys are illegal on method parameter \"key\""); + } + + // Check if this key is a parameter on our event + final AxField eventParameter = axEvent.getParameterMap().get(key); + if (eventParameter == null) { + LOGGER.warn("parameter with key " + key + " not defined on this event"); + throw new EnException("parameter with key " + key + " not defined on this event"); + } + + final Object removedValue = super.remove(key); + eventMonitor.monitorRemove(eventParameter, removedValue, userArtifactStack); + return removedValue; + } + + /* + * (non-Javadoc) + * + * @see java.util.Map#clear() + */ + @Override + public void clear() { + // Override the generic "clear()" call as we want to monitor removals + final Set<String> deleteSet = new HashSet<>(); + deleteSet.addAll(keySet()); + + for (final String deleteKey : deleteSet) { + this.remove(deleteKey); + } + } + + /* + * (non-Javadoc) + * + * @see java.util.AbstractMap#toString() + */ + @Override + public String toString() { + return "EnEvent [axEvent=" + axEvent + ", userArtifactStack=" + Arrays.toString(userArtifactStack) + ", map=" + + super.toString() + "]"; + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/event/EnException.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/event/EnException.java new file mode 100644 index 000000000..79a65cba4 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/event/EnException.java @@ -0,0 +1,51 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.event; + +import org.onap.policy.apex.model.basicmodel.concepts.ApexRuntimeException; + +/** + * This class will be called if an error occurs in Apex event handling. + * + * @author Liam Fallon + */ +public class EnException extends ApexRuntimeException { + private static final long serialVersionUID = -8507246953751956974L; + + /** + * Instantiates a new engine event exception. + * + * @param message the message + */ + public EnException(final String message) { + super(message); + } + + /** + * Instantiates a new engine event exception. + * + * @param message the message + * @param e the e + */ + public EnException(final String message, final Exception e) { + super(message, e); + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/event/EnField.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/event/EnField.java new file mode 100644 index 000000000..5f12e8764 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/event/EnField.java @@ -0,0 +1,153 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.event; + +import java.io.Serializable; + +import org.onap.policy.apex.context.ContextRuntimeException; +import org.onap.policy.apex.context.SchemaHelper; +import org.onap.policy.apex.context.impl.schema.SchemaHelperFactory; +import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey; +import org.onap.policy.apex.model.eventmodel.concepts.AxField; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * Instances of the Class EnField are event fields being passed through the Apex system. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public class EnField implements Serializable { + private static final long serialVersionUID = -5713525780081840333L; + + // Logger for this class + private static final XLogger LOGGER = XLoggerFactory.getXLogger(EnField.class); + + // The definition of this field in the Apex model + private final AxField axField; + + // The schema helper for this field + private SchemaHelper schemaHelper; + + // The value of this field + private final Object value; + + /** + * Instantiates a new EnField, an Engine Field. + * + * @param axField the field definition from the Apex model + * @param value the value + */ + public EnField(final AxField axField, final Object value) { + // Save the field definition from the Apex model + this.axField = axField; + this.value = value; + + // Get a schema helper to handle translations of fields to and from the schema + try { + schemaHelper = new SchemaHelperFactory().createSchemaHelper(axField.getKey(), axField.getSchema()); + } catch (final ContextRuntimeException e) { + final String message = "schema helper cannot be created for parameter with key \"" + axField.getID() + + "\" with schema \"" + axField.getSchema() + "\""; + LOGGER.warn(message, e); + throw new EnException(message, e); + } + } + + /** + * Gets the field definition of this field. + * + * @return the field definition + */ + public AxField getAxField() { + return axField; + } + + /** + * Gets the schema helper of this field. + * + * @return the schema helper for this field + */ + public SchemaHelper getSchemaHelper() { + return schemaHelper; + } + + /** + * Get the name of the field. + * + * @return the field name + */ + public String getName() { + return axField.getKey().getLocalName(); + } + + /** + * Get the key of the field. + * + * @return the field key + */ + public AxReferenceKey getKey() { + return axField.getKey(); + } + + /** + * Get the value of the field. + * + * @return the value + */ + public Object getValue() { + return value; + } + + /* + * (non-Javadoc) + * + * @see java.lang.Object#toString() + */ + @Override + public String toString() { + return "EnField [axField=" + axField + ", value=" + value + "]"; + } + + /** + * Get an assignable object that will work with the field. + * + * @return the assignable value + */ + public Object getAssignableValue() { + // Use the schema helper to get the translated value of the object + return schemaHelper.unmarshal(value); + } + + /** + * Is the value object assignable to this field. + * + * @return true if the value is assignable + */ + public boolean isAssignableValue() { + try { + schemaHelper.unmarshal(value); + return true; + } catch (final Exception e) { + return false; + } + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/event/package-info.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/event/package-info.java new file mode 100644 index 000000000..e94362a75 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/event/package-info.java @@ -0,0 +1,28 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +/** + * Provides the event handling classes that an APEX engine uses and which uses use to send and receive events to and + * from an APEX engine. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ + +package org.onap.policy.apex.core.engine.event; diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/Executor.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/Executor.java new file mode 100644 index 000000000..d659002b2 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/Executor.java @@ -0,0 +1,161 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor; + +import org.onap.policy.apex.context.ContextException; +import org.onap.policy.apex.core.engine.ExecutorParameters; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineException; +import org.onap.policy.apex.model.basicmodel.concepts.AxConcept; + +/** + * This interface defines what operations must be provided by an executing entity in Apex. It is implemented by classes + * that execute logic in a state machine. Each executor has an incoming entity {@code IN} that triggers execution, an + * outgoing entity {@code OUT} that is produced by execution, a subject {@code SUBJECT} that is being executed, and a + * context {@code CONTEXT} in which execution is being carried out. An executor can be part of a chain of executors and + * the {@code setNext} method is used to set the next executor to be executed after this executor has completed. + * + * @author Sven van der Meer (sven.van.der.meer@ericsson.com) + * @author Liam Fallon (liam.fallon@ericsson.com) + * + * @param <IN> type of the incoming entity + * @param <OUT> type of the outgoing entity + * @param <SUBJECT> type that is the subject of execution + * @param <CONTEXT> context holding the context of execution + */ + +public interface Executor<IN, OUT, SUBJECT, CONTEXT> { + /** + * Save the subject and context of the executor. + * + * @param parent the parent executor of this executor or null if this executor is the top executor + * @param executorSubject the executor subject, the subject of execution + * @param executorContext the executor context, the context in which execution takes place + */ + void setContext(Executor<?, ?, ?, ?> parent, SUBJECT executorSubject, CONTEXT executorContext); + + /** + * Prepares the processing. + * + * @throws StateMachineException thrown when a state machine execution error occurs + */ + void prepare() throws StateMachineException; + + /** + * Executes the executor, running through its context in its natural order. + * + * @param executionID the execution ID of the current APEX execution policy thread + * @param incomingEntity the incoming entity that triggers execution + * @return The outgoing entity that is the result of execution + * @throws StateMachineException on an execution error + * @throws ContextException on context errors + */ + OUT execute(long executionID, IN incomingEntity) throws StateMachineException, ContextException; + + /** + * Carry out the preparatory work for execution. + * + * @param executionID the execution ID of the current APEX execution policy thread + * @param incomingEntity the incoming entity that triggers execution + * @throws StateMachineException on an execution error + * @throws ContextException on context errors + */ + void executePre(long executionID, IN incomingEntity) throws StateMachineException, ContextException; + + /** + * Carry out the post work for execution, the returning entity should be set by the child execution object. + * + * @param returnValue the return value indicates whether the execution was successful and, if it failed, how it + * failed + * @throws StateMachineException on an execution error + * @throws ContextException On context errors + */ + void executePost(boolean returnValue) throws StateMachineException, ContextException; + + /** + * Cleans up after processing. + * + * @throws StateMachineException thrown when a state machine execution error occurs + */ + void cleanUp() throws StateMachineException; + + /** + * Get the key associated with the executor. + * + * @return The key associated with the executor + */ + AxConcept getKey(); + + /** + * Get the parent executor of the executor. + * + * @return The parent executor of this executor + */ + Executor<?, ?, ?, ?> getParent(); + + /** + * Get the subject of the executor. + * + * @return The subject for the executor + */ + SUBJECT getSubject(); + + /** + * Get the context of the executor. + * + * @return The context for the executor + */ + CONTEXT getContext(); + + /** + * Get the incoming object of the executor. + * + * @return The incoming object for the executor + */ + IN getIncoming(); + + /** + * Get the outgoing object of the executor. + * + * @return The outgoing object for the executor + */ + OUT getOutgoing(); + + /** + * Save the next executor for this executor. + * + * @param nextExecutor the next executor + */ + void setNext(Executor<IN, OUT, SUBJECT, CONTEXT> nextExecutor); + + /** + * Get the next executor to be run after this executor completes its execution. + * + * @return The next executor + */ + Executor<IN, OUT, SUBJECT, CONTEXT> getNext(); + + /** + * Set parameters for this executor, overloaded by executors that use parameters. + * + * @param parameters executor parameters + */ + void setParameters(ExecutorParameters parameters); +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/ExecutorFactory.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/ExecutorFactory.java new file mode 100644 index 000000000..1bb0b0578 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/ExecutorFactory.java @@ -0,0 +1,67 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor; + +import org.onap.policy.apex.core.engine.context.ApexInternalContext; +import org.onap.policy.apex.model.policymodel.concepts.AxState; +import org.onap.policy.apex.model.policymodel.concepts.AxStateFinalizerLogic; +import org.onap.policy.apex.model.policymodel.concepts.AxTask; + +/** + * This class is used by the state machine to get implementations of task selection and task executors. + * + * @author Liam Fallon + */ + +public abstract class ExecutorFactory { + /** + * Get an executor for task selection logic. + * + * @param stateExecutor the state executor that is requesting the task selection executor + * @param state the state containing the task selection logic + * @param context the context the context in which the task selection logic will execute + * @return The executor that will run the task selection logic + */ + public abstract TaskSelectExecutor getTaskSelectionExecutor(Executor<?, ?, ?, ?> stateExecutor, AxState state, + ApexInternalContext context); + + /** + * Get an executor for task logic. + * + * @param stateExecutor the state executor that is requesting the task executor + * @param task the task containing the task logic + * @param context the context the context in which the task logic will execute + * @return The executor that will run the task logic + */ + public abstract TaskExecutor getTaskExecutor(Executor<?, ?, ?, ?> stateExecutor, AxTask task, + ApexInternalContext context); + + /** + * Get an executor for state finalizer logic. + * + * @param stateExecutor the state executor that is requesting the state finalizer executor + * @param logic the state finalizer logic to execute + * @param context the context the context in which the state finalizer logic will execute + * @return The executor that will run the state finalizer logic + */ + public abstract StateFinalizerExecutor getStateFinalizerExecutor(Executor<?, ?, ?, ?> stateExecutor, + AxStateFinalizerLogic logic, ApexInternalContext context); +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/StateExecutor.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/StateExecutor.java new file mode 100644 index 000000000..ab5b66969 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/StateExecutor.java @@ -0,0 +1,381 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor; + +import java.util.HashMap; +import java.util.Map; +import java.util.Map.Entry; +import java.util.TreeMap; + +import org.onap.policy.apex.context.ContextException; +import org.onap.policy.apex.core.engine.ExecutorParameters; +import org.onap.policy.apex.core.engine.context.ApexInternalContext; +import org.onap.policy.apex.core.engine.event.EnEvent; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineException; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineRuntimeException; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey; +import org.onap.policy.apex.model.basicmodel.service.ModelService; +import org.onap.policy.apex.model.policymodel.concepts.AxState; +import org.onap.policy.apex.model.policymodel.concepts.AxStateFinalizerLogic; +import org.onap.policy.apex.model.policymodel.concepts.AxStateOutput; +import org.onap.policy.apex.model.policymodel.concepts.AxStateTaskOutputType; +import org.onap.policy.apex.model.policymodel.concepts.AxStateTaskReference; +import org.onap.policy.apex.model.policymodel.concepts.AxTask; +import org.onap.policy.apex.model.policymodel.concepts.AxTasks; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * This class is the executor for a state of a policy. + * + * @author Sven van der Meer (sven.van.der.meer@ericsson.com) + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public class StateExecutor implements Executor<EnEvent, StateOutput, AxState, ApexInternalContext> { + // Logger for this class + private static final XLogger LOGGER = XLoggerFactory.getXLogger(StateExecutor.class); + + // Hold the state and context definitions for this state + private AxState axState = null; + private Executor<?, ?, ?, ?> parent = null; + private ApexInternalContext context = null; + + // Holds the incoming event and the state output for this state + private EnEvent lastIncomingEvent = null; + private StateOutput lastStateOutput = null; + + // The task selection logic executor + private TaskSelectExecutor taskSelectExecutor = null; + + // The map of task executors for this state + private final Map<AxArtifactKey, TaskExecutor> taskExecutorMap = new HashMap<>(); + + // The map of state outputs used directly by tasks + private final Map<AxArtifactKey, String> directStateOutputMap = new HashMap<>(); + + // The map of state finalizer logic executors used by tasks + private final Map<AxArtifactKey, StateFinalizerExecutor> task2StateFinalizerMap = new HashMap<>(); + + // The next state executor + private Executor<EnEvent, StateOutput, AxState, ApexInternalContext> nextExecutor = null; + + // The executor factory + private ExecutorFactory executorFactory = null; + + /** + * Constructor, save the executor factory. + * + * @param executorFactory the executor factory to use for getting executors for task selection logic + */ + public StateExecutor(final ExecutorFactory executorFactory) { + this.executorFactory = executorFactory; + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.executor.Executor#setContext(org.onap.policy.apex.core.engine.executor.Executor, + * java.lang.Object, java.lang.Object) + */ + @Override + public void setContext(final Executor<?, ?, ?, ?> incomingParent, final AxState incomingAxState, + final ApexInternalContext incomingContext) { + // Save the state and context definition + this.parent = incomingParent; + this.axState = incomingAxState; + this.context = incomingContext; + + // Set the task selection executor + taskSelectExecutor = executorFactory.getTaskSelectionExecutor(this, axState, context); + + // Set a task executor for each task + for (final Entry<AxArtifactKey, AxStateTaskReference> stateTaskReferenceEntry : axState.getTaskReferences() + .entrySet()) { + final AxArtifactKey taskKey = stateTaskReferenceEntry.getKey(); + final AxStateTaskReference taskReference = stateTaskReferenceEntry.getValue(); + + // Get the task + final AxTask task = ModelService.getModel(AxTasks.class).get(taskKey); + + // Create a task executor for the task + taskExecutorMap.put(taskKey, executorFactory.getTaskExecutor(this, task, context)); + + // Check what type of output is specified for the task on this sate + if (taskReference.getStateTaskOutputType().equals(AxStateTaskOutputType.DIRECT)) { + // Create a task state output reference for this task + directStateOutputMap.put(taskKey, taskReference.getOutput().getLocalName()); + } else if (taskReference.getStateTaskOutputType().equals(AxStateTaskOutputType.LOGIC)) { + // Get the state finalizer logic for this task + final AxStateFinalizerLogic finalizerLogic = + axState.getStateFinalizerLogicMap().get(taskReference.getOutput().getLocalName()); + if (finalizerLogic == null) { + // Finalizer logic for the task does not exist + throw new StateMachineRuntimeException("state finalizer logic on task reference \"" + taskReference + + "\" on state \"" + axState.getID() + "\" does not exist"); + } + + // Create a state finalizer executor for the task + task2StateFinalizerMap.put(taskKey, + executorFactory.getStateFinalizerExecutor(this, finalizerLogic, context)); + } else { + // This should never happen but..... + throw new StateMachineRuntimeException("invalid state output type on task reference \"" + taskReference + + "\" on state \"" + axState.getID() + "\""); + } + } + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#prepare() + */ + @Override + public void prepare() throws StateMachineException { + // There may be no task selection logic + if (taskSelectExecutor != null) { + // Prepare the task selector + taskSelectExecutor.prepare(); + } + + // Prepare the tasks + for (final TaskExecutor taskExecutor : taskExecutorMap.values()) { + taskExecutor.prepare(); + } + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#execute(java.lang.long, java.lang.Object) + */ + @Override + public StateOutput execute(final long executionID, final EnEvent incomingEvent) + throws StateMachineException, ContextException { + this.lastIncomingEvent = incomingEvent; + + // Check that the incoming event matches the trigger for this state + if (!incomingEvent.getAxEvent().getKey().equals(axState.getTrigger())) { + throw new StateMachineException("incoming event \"" + incomingEvent.getID() + "\" does not match trigger \"" + + axState.getTrigger().getID() + "\" of state \"" + axState.getID() + "\""); + } + + // The key of the task to execute + AxArtifactKey taskKey = null; + + try { + // There may be no task selection logic, in which case just return the default task + if (taskSelectExecutor != null) { + // Fire the task selector to find the task to run + taskKey = taskSelectExecutor.execute(executionID, incomingEvent); + } + + // If there's no task selection logic or the TSL returned no task, just use the default task + if (taskKey == null) { + taskKey = axState.getDefaultTask(); + } + + // Execute the task + final TreeMap<String, Object> incomingValues = new TreeMap<>(); + incomingValues.putAll(incomingEvent); + final Map<String, Object> taskExecutionResultMap = + taskExecutorMap.get(taskKey).execute(executionID, incomingValues); + final AxTask task = taskExecutorMap.get(taskKey).getSubject(); + + // Check if this task has direct output + String stateOutputName = directStateOutputMap.get(taskKey); + + // If a direct state output name was not found, state finalizer logic should be defined for the task + if (stateOutputName == null) { + // State finalizer logic should exist for the task + final StateFinalizerExecutor finalizerLogicExecutor = task2StateFinalizerMap.get(taskKey); + if (finalizerLogicExecutor == null) { + throw new StateMachineException("state finalizer logic for task \"" + taskKey.getID() + + "\" not found for state \"" + axState.getID() + "\""); + } + + // Execute the state finalizer logic to select a state output and to adjust the taskExecutionResultMap + stateOutputName = + finalizerLogicExecutor.execute(incomingEvent.getExecutionID(), taskExecutionResultMap); + } + + // Now look up the the actual state output + final AxStateOutput stateOutputDefinition = axState.getStateOutputs().get(stateOutputName); + if (stateOutputDefinition == null) { + throw new StateMachineException("state output definition for state output \"" + stateOutputName + + "\" not found for state \"" + axState.getID() + "\""); + } + + // Create the state output and transfer all the fields across to its event + final StateOutput stateOutput = new StateOutput(stateOutputDefinition); + this.lastStateOutput = stateOutput; + + stateOutput.setEventFields(task.getRawOutputFields(), taskExecutionResultMap); + + // Copy across fields from the incoming event that are not set on the outgoing event + stateOutput.copyUnsetFields(incomingEvent); + + // Set the ExecutionID for the outgoing event to the value in the incoming event. + if (stateOutput != null && stateOutput.getOutputEvent() != null) { + stateOutput.getOutputEvent().setExecutionID(incomingEvent.getExecutionID()); + } + + // That's it, the state execution is complete + return stateOutput; + } catch (final Exception e) { + final String errorMessage = "State execution of state \"" + axState.getID() + "\" on task \"" + + (taskKey != null ? taskKey.getID() : "null") + "\" failed: " + e.getMessage(); + + LOGGER.warn(errorMessage); + throw new StateMachineException(errorMessage, e); + } + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#executePre(java.lang.long, java.lang.Object) + */ + @Override + public final void executePre(final long executionID, final EnEvent incomingEntity) throws StateMachineException { + throw new StateMachineException("execution pre work not implemented on class"); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#executePost(boolean) + */ + @Override + public final void executePost(final boolean returnValue) throws StateMachineException { + throw new StateMachineException("execution post work not implemented on class"); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#cleanUp() + */ + @Override + public void cleanUp() throws StateMachineException { + // Clean the tasks + for (final TaskExecutor taskExecutor : taskExecutorMap.values()) { + taskExecutor.cleanUp(); + } + + if (taskSelectExecutor != null) { + // Clean the task selector + taskSelectExecutor.cleanUp(); + } + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getKey() + */ + @Override + public AxReferenceKey getKey() { + return axState.getKey(); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getParent() + */ + @Override + public Executor<?, ?, ?, ?> getParent() { + return parent; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getSubject() + */ + @Override + public AxState getSubject() { + return axState; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getContext() + */ + @Override + public final ApexInternalContext getContext() { + return context; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getIncoming() + */ + @Override + public final EnEvent getIncoming() { + return lastIncomingEvent; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getOutgoing() + */ + @Override + public final StateOutput getOutgoing() { + return lastStateOutput; + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.executor.Executor#setNext(org.onap.policy.apex.core.engine.executor.Executor) + */ + @Override + public final void setNext(final Executor<EnEvent, StateOutput, AxState, ApexInternalContext> incomingNextExecutor) { + this.nextExecutor = incomingNextExecutor; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getNext() + */ + @Override + public final Executor<EnEvent, StateOutput, AxState, ApexInternalContext> getNext() { + return nextExecutor; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#setParameters(org.onap.policy.apex.core.engine. + * ExecutorParameters) + */ + @Override + public void setParameters(final ExecutorParameters parameters) {} +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/StateFinalizerExecutor.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/StateFinalizerExecutor.java new file mode 100644 index 000000000..17691011f --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/StateFinalizerExecutor.java @@ -0,0 +1,272 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor; + +import static org.onap.policy.apex.model.utilities.Assertions.argumentNotNull; + +import java.util.Map; + +import org.onap.policy.apex.context.ContextException; +import org.onap.policy.apex.core.engine.ExecutorParameters; +import org.onap.policy.apex.core.engine.context.ApexInternalContext; +import org.onap.policy.apex.core.engine.executor.context.StateFinalizerExecutionContext; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineException; +import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey; +import org.onap.policy.apex.model.policymodel.concepts.AxState; +import org.onap.policy.apex.model.policymodel.concepts.AxStateFinalizerLogic; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * This abstract class executes state finalizer logic in a state of an Apex policy and is specialized by classes that + * implement execution of state finalizer logic. + * + * @author Sven van der Meer (sven.van.der.meer@ericsson.com) + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public abstract class StateFinalizerExecutor + implements Executor<Map<String, Object>, String, AxStateFinalizerLogic, ApexInternalContext> { + // Logger for this class + private static final XLogger LOGGER = XLoggerFactory.getXLogger(StateFinalizerExecutor.class); + + // Hold the state and context definitions + private Executor<?, ?, ?, ?> parent = null; + private AxState axState = null; + private AxStateFinalizerLogic finalizerLogic = null; + private ApexInternalContext internalContext = null; + + // Holds the incoming and outgoing fields + private Map<String, Object> incomingFields = null; + + // The next state finalizer executor + private Executor<Map<String, Object>, String, AxStateFinalizerLogic, ApexInternalContext> nextExecutor = null; + + // The execution context; contains the facades for events and context to be used by tasks executed by this task + // executor + private StateFinalizerExecutionContext executionContext = null; + + /** + * Gets the execution internalContext. + * + * @return the execution context + */ + protected StateFinalizerExecutionContext getExecutionContext() { + return executionContext; + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.executor.Executor#setContext(org.onap.policy.apex.core.engine.executor.Executor, + * java.lang.Object, java.lang.Object) + */ + @Override + public void setContext(final Executor<?, ?, ?, ?> incomingParent, + final AxStateFinalizerLogic incomingFinalizerLogic, final ApexInternalContext incomingInternalContext) { + this.parent = incomingParent; + axState = (AxState) parent.getSubject(); + this.finalizerLogic = incomingFinalizerLogic; + this.internalContext = incomingInternalContext; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#prepare() + */ + @Override + public void prepare() throws StateMachineException { + LOGGER.debug("prepare:" + finalizerLogic.getID() + "," + finalizerLogic.getLogicFlavour() + "," + + finalizerLogic.getLogic()); + argumentNotNull(finalizerLogic.getLogic(), StateMachineException.class, "task logic cannot be null."); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#execute(java.lang.long, java.lang.Object) + */ + @Override + public String execute(final long executionID, final Map<String, Object> newIncomingFields) + throws StateMachineException, ContextException { + throw new StateMachineException( + "execute() not implemented on abstract StateFinalizerExecutionContext class, only on its subclasses"); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#executePre(java.lang.long, java.lang.Object) + */ + @Override + public final void executePre(final long executionID, final Map<String, Object> newIncomingFields) + throws StateMachineException, ContextException { + LOGGER.debug("execute-pre:" + finalizerLogic.getLogicFlavour() + "," + getSubject().getID() + "," + + finalizerLogic.getLogic()); + + // Record the incoming fields + this.incomingFields = newIncomingFields; + + // Get state finalizer context object + executionContext = new StateFinalizerExecutionContext(this, executionID, axState, getIncoming(), + axState.getStateOutputs().keySet(), getContext()); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#executePost(boolean) + */ + @Override + public final void executePost(final boolean returnValue) throws StateMachineException, ContextException { + if (!returnValue) { + String errorMessage = "execute-post: state finalizer logic execution failure on state \"" + axState.getID() + + "\" on finalizer logic " + finalizerLogic.getID(); + if (executionContext.getMessage() != null) { + errorMessage += ", user message: " + executionContext.getMessage(); + } + LOGGER.warn(errorMessage); + throw new StateMachineException(errorMessage); + } + + // Check a state output has been selected + if (getOutgoing() == null) { + LOGGER.warn("execute-post: state finalizer logic \"" + finalizerLogic.getID() + + "\" did not select an output state"); + throw new StateMachineException("execute-post: state finalizer logic \"" + finalizerLogic.getID() + + "\" did not select an output state"); + } + + if (!axState.getStateOutputs().keySet().contains(getOutgoing())) { + LOGGER.warn( + "execute-post: state finalizer logic \"" + finalizerLogic.getID() + "\" selected output state \"" + + getOutgoing() + "\" that does not exsist on state \"" + axState.getID() + "\""); + throw new StateMachineException( + "execute-post: state finalizer logic \"" + finalizerLogic.getID() + "\" selected output state \"" + + getOutgoing() + "\" that does not exsist on state \"" + axState.getID() + "\""); + } + + LOGGER.debug("execute-post:" + finalizerLogic.getID() + ", returning state output \"" + getOutgoing() + + " and fields " + incomingFields); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#cleanUp() + */ + @Override + public void cleanUp() throws StateMachineException { + throw new StateMachineException("cleanUp() not implemented on class"); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getKey() + */ + @Override + public AxReferenceKey getKey() { + return finalizerLogic.getKey(); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getParent() + */ + @Override + public Executor<?, ?, ?, ?> getParent() { + return parent; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getSubject() + */ + @Override + public AxStateFinalizerLogic getSubject() { + return finalizerLogic; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getContext() + */ + @Override + public ApexInternalContext getContext() { + return internalContext; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getIncoming() + */ + @Override + public Map<String, Object> getIncoming() { + return incomingFields; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getOutgoing() + */ + @Override + public String getOutgoing() { + return executionContext.getSelectedStateOutputName(); + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.executor.Executor#setNext(org.onap.policy.apex.core.engine.executor.Executor) + */ + @Override + public void setNext( + final Executor<Map<String, Object>, String, AxStateFinalizerLogic, ApexInternalContext> incomingNextExecutor) { + this.nextExecutor = incomingNextExecutor; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getNext() + */ + @Override + public Executor<Map<String, Object>, String, AxStateFinalizerLogic, ApexInternalContext> getNext() { + return nextExecutor; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#setParameters(org.onap.policy.apex.core.engine. + * ExecutorParameters) + */ + @Override + public void setParameters(final ExecutorParameters parameters) {} +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/StateMachineExecutor.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/StateMachineExecutor.java new file mode 100644 index 000000000..05e1b3b4b --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/StateMachineExecutor.java @@ -0,0 +1,290 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor; + +import java.util.Map; +import java.util.TreeMap; + +import org.onap.policy.apex.context.ContextException; +import org.onap.policy.apex.core.engine.ExecutorParameters; +import org.onap.policy.apex.core.engine.context.ApexInternalContext; +import org.onap.policy.apex.core.engine.event.EnEvent; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineException; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey; +import org.onap.policy.apex.model.policymodel.concepts.AxPolicy; +import org.onap.policy.apex.model.policymodel.concepts.AxState; +import org.onap.policy.apex.model.policymodel.concepts.AxStateOutput; + +/** + * This class is the executor for a state machine built from a policy. + * + * @author Sven van der Meer (sven.van.der.meer@ericsson.com) + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public class StateMachineExecutor implements Executor<EnEvent, EnEvent, AxPolicy, ApexInternalContext> { + // The Apex Policy and context for this state machine + private AxPolicy axPolicy = null; + private Executor<?, ?, ?, ?> parent = null; + private ApexInternalContext internalContext = null; + + // The list of state executors for this state machine + private final Map<AxReferenceKey, StateExecutor> stateExecutorMap = new TreeMap<>(); + + // The first executor + private StateExecutor firstExecutor = null; + + // The next state machine executor + private Executor<EnEvent, EnEvent, AxPolicy, ApexInternalContext> nextExecutor = null; + + // The executor factory + private ExecutorFactory executorFactory = null; + + /** + * Constructor, save the executor factory that will give us executors for task selection logic and task logic. + * + * @param executorFactory the executor factory + * @param owner the artifact key of the owner of this state machine + */ + public StateMachineExecutor(final ExecutorFactory executorFactory, final AxArtifactKey owner) { + this.executorFactory = executorFactory; + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.executor.Executor#setContext(org.onap.policy.apex.core.engine.executor.Executor, + * java.lang.Object, java.lang.Object) + */ + @Override + public void setContext(final Executor<?, ?, ?, ?> newParent, final AxPolicy newAxPolicy, + final ApexInternalContext newInternalContext) { + // Save the policy and context for this state machine + this.parent = newParent; + this.axPolicy = newAxPolicy; + this.internalContext = newInternalContext; + + // Clear the first executor, setContext can be called multiple times + firstExecutor = null; + + // Create the state executors for this state machine + StateExecutor lastExecutor = null; + for (final AxState state : axPolicy.getStateMap().values()) { + // Create a state executor for this state and add its context (the state) + final StateExecutor stateExecutor = new StateExecutor(executorFactory); + stateExecutor.setContext(this, state, internalContext); + + // Update the next executor on the last executor + if (lastExecutor != null) { + lastExecutor.setNext(stateExecutor); + } + lastExecutor = stateExecutor; + + // Add the state executor to the executor list + stateExecutorMap.put(state.getKey(), stateExecutor); + + // Set the first executor if it is not set + if (state.getKey().getLocalName().equals(axPolicy.getFirstState())) { + firstExecutor = stateExecutor; + } + } + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#prepare() + */ + @Override + public void prepare() throws StateMachineException { + for (final StateExecutor stateExecutor : stateExecutorMap.values()) { + stateExecutor.prepare(); + } + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#executeDirected(java.lang.long, java.lang.Object) + */ + @Override + public EnEvent execute(final long executionID, final EnEvent incomingEvent) + throws StateMachineException, ContextException { + // Check if there are any states on the state machine + if (stateExecutorMap.size() == 0) { + throw new StateMachineException("no states defined on state machine"); + } + + // Check if the first state of the machine is defined + if (firstExecutor == null) { + throw new StateMachineException("first state not defined on state machine"); + } + + // Get the first state of the state machine and define a state output that starts state execution + StateExecutor stateExecutor = firstExecutor; + StateOutput stateOutput = new StateOutput(new AxStateOutput(firstExecutor.getSubject().getKey(), + incomingEvent.getKey(), firstExecutor.getSubject().getKey()), incomingEvent); + while (true) { + // Execute the state + stateOutput = stateExecutor.execute(executionID, stateOutput.getOutputEvent()); + if (stateOutput == null) { + throw new StateMachineException("state execution failed, invalid state output returned"); + } + + // Use the next state of the state output to find if all the states have executed + if (stateOutput.getNextState().equals(AxReferenceKey.getNullKey())) { + break; + } + + // Use the next state of the state output to find the next state + stateExecutor = stateExecutorMap.get(stateOutput.getNextState()); + if (stateExecutor == null) { + throw new StateMachineException( + "state execution failed, next state \"" + stateOutput.getNextState().getID() + "\" not found"); + } + } + + return stateOutput.getOutputEvent(); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#executePre(java.lang.long, java.lang.Object) + */ + @Override + public final void executePre(final long executionID, final EnEvent incomingEntity) throws StateMachineException { + throw new StateMachineException("execution pre work not implemented on class"); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#executePost(boolean) + */ + @Override + public final void executePost(final boolean returnValue) throws StateMachineException { + throw new StateMachineException("execution post work not implemented on class"); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#cleanUp() + */ + @Override + public void cleanUp() throws StateMachineException { + for (final StateExecutor stateExecutor : stateExecutorMap.values()) { + stateExecutor.cleanUp(); + } + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getKey() + */ + @Override + public AxArtifactKey getKey() { + return axPolicy.getKey(); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getParent() + */ + @Override + public final Executor<?, ?, ?, ?> getParent() { + return parent; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getSubject() + */ + @Override + public final AxPolicy getSubject() { + return axPolicy; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getContext() + */ + @Override + public final ApexInternalContext getContext() { + return internalContext; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getIncoming() + */ + @Override + public final EnEvent getIncoming() { + return null; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getOutgoing() + */ + @Override + public final EnEvent getOutgoing() { + return null; + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.executor.Executor#setNext(org.onap.policy.apex.core.engine.executor.Executor) + */ + @Override + public final void setNext(final Executor<EnEvent, EnEvent, AxPolicy, ApexInternalContext> newNextExecutor) { + this.nextExecutor = newNextExecutor; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getNext() + */ + @Override + public final Executor<EnEvent, EnEvent, AxPolicy, ApexInternalContext> getNext() { + return nextExecutor; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#setParameters(org.onap.policy.apex.core.engine. + * ExecutorParameters) + */ + @Override + public void setParameters(final ExecutorParameters parameters) {} +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/StateOutput.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/StateOutput.java new file mode 100644 index 000000000..2274b7c23 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/StateOutput.java @@ -0,0 +1,167 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor; + +import java.util.Map; +import java.util.Map.Entry; + +import org.onap.policy.apex.core.engine.event.EnEvent; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineException; +import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey; +import org.onap.policy.apex.model.basicmodel.service.ModelService; +import org.onap.policy.apex.model.eventmodel.concepts.AxEvent; +import org.onap.policy.apex.model.eventmodel.concepts.AxEvents; +import org.onap.policy.apex.model.eventmodel.concepts.AxField; +import org.onap.policy.apex.model.policymodel.concepts.AxStateOutput; +import org.onap.policy.apex.model.utilities.Assertions; + +/** + * This class is the output of a state, and is used by the engine to decide what the next state for execution is. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public class StateOutput { + // The state output has a state and an event + private final AxStateOutput stateOutputDefinition; + private final AxEvent outputEventDef; + private final EnEvent outputEvent; + + /** + * Create a new state output from a state output definition. + * + * @param axStateOutput the state output definition + */ + public StateOutput(final AxStateOutput axStateOutput) { + this(axStateOutput, new EnEvent(axStateOutput.getOutgingEvent())); + } + + /** + * Create a new state output with the given definition and event key. + * + * @param stateOutputDefinition the state output definition + * @param outputEvent the output event + */ + public StateOutput(final AxStateOutput stateOutputDefinition, final EnEvent outputEvent) { + Assertions.argumentNotNull(stateOutputDefinition, "stateOutputDefinition may not be null"); + Assertions.argumentNotNull(outputEvent, "outputEvent may not be null"); + + this.stateOutputDefinition = stateOutputDefinition; + this.outputEvent = outputEvent; + outputEventDef = ModelService.getModel(AxEvents.class).get(stateOutputDefinition.getOutgingEvent()); + } + + /** + * Gets the next state. + * + * @return the next state + */ + public AxReferenceKey getNextState() { + return stateOutputDefinition.getNextState(); + } + + /** + * Gets the state output definition. + * + * @return the state output definition + */ + public AxStateOutput getStateOutputDefinition() { + return stateOutputDefinition; + } + + /** + * Gets the output event. + * + * @return the output event + */ + public EnEvent getOutputEvent() { + return outputEvent; + } + + /** + * Transfer the fields from the incoming field map into the event. + * + * @param incomingFieldDefinitionMap definitions of the incoming fields + * @param eventFieldMap the event field map + * @throws StateMachineException on errors populating the event fields + */ + public void setEventFields(final Map<String, AxField> incomingFieldDefinitionMap, + final Map<String, Object> eventFieldMap) throws StateMachineException { + Assertions.argumentNotNull(incomingFieldDefinitionMap, "incomingFieldDefinitionMap may not be null"); + Assertions.argumentNotNull(eventFieldMap, "eventFieldMap may not be null"); + + if (!incomingFieldDefinitionMap.keySet().equals(eventFieldMap.keySet())) { + throw new StateMachineException( + "field definitions and values do not match for event " + outputEventDef.getID() + '\n' + + incomingFieldDefinitionMap.keySet() + '\n' + eventFieldMap.keySet()); + } + for (final Entry<String, Object> incomingFieldEntry : eventFieldMap.entrySet()) { + final String fieldName = incomingFieldEntry.getKey(); + final AxField fieldDef = incomingFieldDefinitionMap.get(fieldName); + try { + + // Check if this field is a field in the event + if (!outputEventDef.getFields().contains(fieldDef)) { + throw new StateMachineException( + "field \"" + fieldName + "\" does not exist on event \"" + outputEventDef.getID() + "\""); + } + } catch (final Exception e) { + e.printStackTrace(); + } + + // Set the value in the output event + outputEvent.put(fieldName, incomingFieldEntry.getValue()); + } + } + + /** + * This method copies any fields that exist on the input event that also exist on the output event if they are not + * set on the output event. + * + * @param incomingEvent The incoming event to copy from + */ + public void copyUnsetFields(final EnEvent incomingEvent) { + Assertions.argumentNotNull(incomingEvent, "incomingEvent may not be null"); + + for (final Entry<String, Object> incomingField : incomingEvent.entrySet()) { + final String fieldName = incomingField.getKey(); + + // Check if the field exists on the outgoing event + if (!outputEventDef.getParameterMap().containsKey(fieldName)) { + continue; + } + + // Check if the field is set on the outgoing event + if (outputEvent.containsKey(fieldName)) { + continue; + } + + // Now, check the fields have the same type + if (!incomingEvent.getAxEvent().getParameterMap().get(fieldName) + .equals(outputEvent.getAxEvent().getParameterMap().get(fieldName))) { + continue; + } + + // All checks done, we can copy the value + outputEvent.put(fieldName, incomingField.getValue()); + } + + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/TaskExecutor.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/TaskExecutor.java new file mode 100644 index 000000000..4a105b03f --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/TaskExecutor.java @@ -0,0 +1,328 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor; + +import static org.onap.policy.apex.model.utilities.Assertions.argumentNotNull; + +import java.util.Iterator; +import java.util.Map; +import java.util.Set; +import java.util.TreeMap; +import java.util.TreeSet; + +import org.onap.policy.apex.context.ContextException; +import org.onap.policy.apex.core.engine.ExecutorParameters; +import org.onap.policy.apex.core.engine.context.ApexInternalContext; +import org.onap.policy.apex.core.engine.executor.context.TaskExecutionContext; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineException; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.eventmodel.concepts.AxInputField; +import org.onap.policy.apex.model.eventmodel.concepts.AxOutputField; +import org.onap.policy.apex.model.policymodel.concepts.AxTask; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * This abstract class executes a task in a state of an Apex policy and is specialized by classes that implement + * execution of task logic. + * + * @author Sven van der Meer (sven.van.der.meer@ericsson.com) + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public abstract class TaskExecutor + implements Executor<Map<String, Object>, Map<String, Object>, AxTask, ApexInternalContext> { + // Logger for this class + private static final XLogger LOGGER = XLoggerFactory.getXLogger(TaskExecutor.class); + + // Hold the task and context definitions for this task + private Executor<?, ?, ?, ?> parent = null; + private AxTask axTask = null; + private ApexInternalContext internalContext = null; + + // Holds the incoming and outgoing fields + private Map<String, Object> incomingFields = null; + private Map<String, Object> outgoingFields = null; + + // The next task executor + private Executor<Map<String, Object>, Map<String, Object>, AxTask, ApexInternalContext> nextExecutor = null; + + // The task execution context; contains the facades for events and context to be used by tasks executed by this task + // executor + private TaskExecutionContext executionContext = null; + + /** + * Gets the execution internalContext. + * + * @return the execution context + */ + protected TaskExecutionContext getExecutionContext() { + return executionContext; + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.executor.Executor#setContext(org.onap.policy.apex.core.engine.executor.Executor, + * java.lang.Object, java.lang.Object) + */ + @Override + public void setContext(final Executor<?, ?, ?, ?> newParent, final AxTask newAxTask, + final ApexInternalContext newInternalContext) { + this.parent = newParent; + this.axTask = newAxTask; + this.internalContext = newInternalContext; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#prepare() + */ + @Override + public void prepare() throws StateMachineException { + LOGGER.debug("prepare:" + axTask.getKey().getID() + "," + axTask.getTaskLogic().getLogicFlavour() + "," + + axTask.getTaskLogic().getLogic()); + argumentNotNull(axTask.getTaskLogic().getLogic(), StateMachineException.class, "task logic cannot be null."); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#execute(java.lang.long, java.lang.Object) + */ + @Override + public Map<String, Object> execute(final long executionID, final Map<String, Object> newIncomingFields) + throws StateMachineException, ContextException { + throw new StateMachineException( + "execute() not implemented on abstract TaskExecutor class, only on its subclasses"); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#executePre(java.lang.long, java.lang.Object) + */ + @Override + public final void executePre(final long executionID, final Map<String, Object> newIncomingFields) + throws StateMachineException, ContextException { + LOGGER.debug("execute-pre:" + getSubject().getTaskLogic().getLogicFlavour() + "," + + getSubject().getKey().getID() + "," + getSubject().getTaskLogic().getLogic()); + + // Check that the incoming event has all the input fields for this state + final Set<String> missingTaskInputFields = new TreeSet<>(axTask.getInputFields().keySet()); + missingTaskInputFields.removeAll(newIncomingFields.keySet()); + + // Remove fields from the set that are optional + for (final Iterator<String> missingFieldIterator = missingTaskInputFields.iterator(); missingFieldIterator + .hasNext();) { + final String missingField = missingFieldIterator.next(); + if (axTask.getInputFields().get(missingField).getOptional()) { + missingTaskInputFields.remove(missingField); + } + } + if (!missingTaskInputFields.isEmpty()) { + throw new StateMachineException("task input fields \"" + missingTaskInputFields + + "\" are missing for task \"" + axTask.getKey().getID() + "\""); + } + + // Record the incoming fields + this.incomingFields = newIncomingFields; + + // Initiate the outgoing fields + outgoingFields = new TreeMap<>(); + for (final String outputFieldName : getSubject().getOutputFields().keySet()) { + outgoingFields.put(outputFieldName, null); + } + + // Get task context object + executionContext = + new TaskExecutionContext(this, executionID, getSubject(), getIncoming(), getOutgoing(), getContext()); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#executePost(boolean) + */ + @Override + public final void executePost(final boolean returnValue) throws StateMachineException, ContextException { + if (!returnValue) { + String errorMessage = "execute-post: task logic execution failure on task \"" + axTask.getKey().getName() + + "\" in model " + internalContext.getKey().getID(); + if (executionContext.getMessage() != null) { + errorMessage += ", user message: " + executionContext.getMessage(); + } + LOGGER.warn(errorMessage); + throw new StateMachineException(errorMessage); + } + + // Copy any unset fields from the input to the output if their data type and names are identical + for (final String field : axTask.getOutputFields().keySet()) { + // Check if the field exists and is not set on the output + if (!getOutgoing().containsKey(field) || getOutgoing().get(field) != null) { + continue; + } + + // This field is not in the output, check if it's on the input and is the same type (Note here, the output + // field definition has to exist so it's not + // null checked) + final AxInputField inputFieldDef = axTask.getInputFields().get(field); + final AxOutputField outputFieldDef = axTask.getOutputFields().get(field); + if (inputFieldDef == null || !inputFieldDef.getSchema().equals(outputFieldDef.getSchema())) { + continue; + } + + // We have an input field that matches our output field, copy the value across + getOutgoing().put(field, getIncoming().get(field)); + } + + // Finally, check that the outgoing fields have all the output fields defined for this state and, if not, output + // a list of missing fields + final Set<String> missingTaskOutputFields = new TreeSet<>(axTask.getOutputFields().keySet()); + missingTaskOutputFields.removeAll(outgoingFields.keySet()); + + // Remove fields from the set that are optional + for (final Iterator<String> missingFieldIterator = missingTaskOutputFields.iterator(); missingFieldIterator + .hasNext();) { + final String missingField = missingFieldIterator.next(); + if (axTask.getInputFields().get(missingField).getOptional()) { + missingTaskOutputFields.remove(missingField); + } + } + if (!missingTaskOutputFields.isEmpty()) { + throw new StateMachineException("task output fields \"" + missingTaskOutputFields + + "\" are missing for task \"" + axTask.getKey().getID() + "\""); + } + + // Finally, check that the outgoing field map don't have any extra fields, if present, raise exception with the + // list of extra fields + final Set<String> extraTaskOutputFields = new TreeSet<>(outgoingFields.keySet()); + extraTaskOutputFields.removeAll(axTask.getOutputFields().keySet()); + if (!extraTaskOutputFields.isEmpty()) { + throw new StateMachineException("task output fields \"" + extraTaskOutputFields + + "\" are unwanted for task \"" + axTask.getKey().getID() + "\""); + } + + LOGGER.debug("execute-post:" + axTask.getKey().getID() + ", returning fields " + outgoingFields.toString()); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#cleanUp() + */ + @Override + public void cleanUp() throws StateMachineException { + throw new StateMachineException("cleanUp() not implemented on class"); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getKey() + */ + @Override + public AxArtifactKey getKey() { + return axTask.getKey(); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getParent() + */ + @Override + public Executor<?, ?, ?, ?> getParent() { + return parent; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getSubject() + */ + @Override + public AxTask getSubject() { + return axTask; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getContext() + */ + @Override + public ApexInternalContext getContext() { + return internalContext; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getIncoming() + */ + @Override + public Map<String, Object> getIncoming() { + return incomingFields; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getOutgoing() + */ + @Override + public Map<String, Object> getOutgoing() { + return outgoingFields; + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.executor.Executor#setNext(org.onap.policy.apex.core.engine.executor.Executor) + */ + @Override + public void setNext( + final Executor<Map<String, Object>, Map<String, Object>, AxTask, ApexInternalContext> newNextExecutor) { + this.nextExecutor = newNextExecutor; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getNext() + */ + @Override + public Executor<Map<String, Object>, Map<String, Object>, AxTask, ApexInternalContext> getNext() { + return nextExecutor; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#setParameters(org.onap.policy.apex.core.engine. + * ExecutorParameters) + */ + @Override + public void setParameters(final ExecutorParameters parameters) {} +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/TaskSelectExecutor.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/TaskSelectExecutor.java new file mode 100644 index 000000000..1aaa5ccf5 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/TaskSelectExecutor.java @@ -0,0 +1,263 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor; + +import static org.onap.policy.apex.model.utilities.Assertions.argumentNotNull; + +import org.onap.policy.apex.context.ContextException; +import org.onap.policy.apex.core.engine.ExecutorParameters; +import org.onap.policy.apex.core.engine.context.ApexInternalContext; +import org.onap.policy.apex.core.engine.event.EnEvent; +import org.onap.policy.apex.core.engine.executor.context.TaskSelectionExecutionContext; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineException; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey; +import org.onap.policy.apex.model.policymodel.concepts.AxState; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * This abstract class executes a the task selection logic of a state of an Apex policy and is specialized by classes + * that implement execution of task selection logic. + * + * @author Sven van der Meer (sven.van.der.meer@ericsson.com) + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public abstract class TaskSelectExecutor implements Executor<EnEvent, AxArtifactKey, AxState, ApexInternalContext> { + // Logger for this class + private static final XLogger LOGGER = XLoggerFactory.getXLogger(TaskSelectExecutor.class); + + // Hold the state and context definitions for this task selector + private Executor<?, ?, ?, ?> parent = null; + private AxState axState = null; + private ApexInternalContext context = null; + + // Holds the incoming event and outgoing task keys + private EnEvent incomingEvent = null; + private AxArtifactKey outgoingTaskKey = null; + + // The next task selection executor + private Executor<EnEvent, AxArtifactKey, AxState, ApexInternalContext> nextExecutor = null; + + // The task selection execution context; contains the facades for events and context to be used by tasks executed by + // this task selection executor + private TaskSelectionExecutionContext executionContext; + + /** + * Gets the execution context. + * + * @return the execution context + */ + protected TaskSelectionExecutionContext getExecutionContext() { + return executionContext; + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.executor.Executor#setContext(org.onap.policy.apex.core.engine.executor.Executor, + * java.lang.Object, java.lang.Object) + */ + @Override + public void setContext(final Executor<?, ?, ?, ?> newParent, final AxState newAxState, + final ApexInternalContext newContext) { + this.parent = newParent; + this.axState = newAxState; + this.context = newContext; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#prepare() + */ + @Override + public void prepare() throws StateMachineException { + LOGGER.debug("prepare:" + axState.getKey().getID() + "," + axState.getTaskSelectionLogic().getLogicFlavour() + + "," + axState.getTaskSelectionLogic().getLogic()); + argumentNotNull(axState.getTaskSelectionLogic().getLogic(), "task selection logic cannot be null."); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#execute(java.lang.long, java.lang.Object) + */ + @Override + public AxArtifactKey execute(final long executionID, final EnEvent newIncomingEvent) + throws StateMachineException, ContextException { + throw new StateMachineException("execute() not implemented on class"); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#executePre(java.lang.long, java.lang.Object) + */ + @Override + public final void executePre(final long executionID, final EnEvent newIncomingEvent) throws StateMachineException { + LOGGER.debug("execute-pre:" + axState.getKey().getID() + "," + axState.getTaskSelectionLogic().getLogicFlavour() + + "," + axState.getTaskSelectionLogic().getLogic()); + + this.incomingEvent = newIncomingEvent; + + // Initialize the returned task object so it can be set + outgoingTaskKey = new AxArtifactKey(); + + // Get task selection context object + executionContext = new TaskSelectionExecutionContext(this, executionID, getSubject(), getIncoming(), + getOutgoing(), getContext()); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#executePost(boolean) + */ + @Override + public final void executePost(final boolean returnValue) throws StateMachineException { + if (!returnValue) { + String errorMessage = + "execute-post: task selection logic failed on state \"" + axState.getKey().getID() + "\""; + if (executionContext.getMessage() != null) { + errorMessage += ", user message: " + executionContext.getMessage(); + } + LOGGER.warn(errorMessage); + throw new StateMachineException(errorMessage); + } + + if (outgoingTaskKey == null || AxArtifactKey.getNullKey().getName().equals(outgoingTaskKey.getName())) { + outgoingTaskKey = axState.getDefaultTask(); + LOGGER.debug("execute-post:" + axState.getKey().getID() + ", returning default task"); + return; + } + + if (!axState.getTaskReferences().containsKey(outgoingTaskKey)) { + LOGGER.error("execute-post: task \"" + outgoingTaskKey.getID() + + "\" returned by task selection logic not defined on state \"" + axState.getKey().getID() + "\""); + throw new StateMachineException("task \"" + outgoingTaskKey.getID() + + "\" returned by task selection logic not defined on state \"" + axState.getKey().getID() + "\""); + } + + LOGGER.debug("execute-post:" + axState.getKey().getID() + "," + ", returning task " + outgoingTaskKey.getID()); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#cleanUp() + */ + @Override + public void cleanUp() throws StateMachineException { + throw new StateMachineException("cleanUp() not implemented on class"); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getKey() + */ + @Override + public AxReferenceKey getKey() { + return axState.getKey(); + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getParent() + */ + @Override + public Executor<?, ?, ?, ?> getParent() { + return parent; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getSubject() + */ + @Override + public AxState getSubject() { + return axState; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getContext() + */ + @Override + public ApexInternalContext getContext() { + return context; + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.executor.Executor#setNext(org.onap.policy.apex.core.engine.executor.Executor) + */ + @Override + public void setNext(final Executor<EnEvent, AxArtifactKey, AxState, ApexInternalContext> newNextExecutor) { + this.nextExecutor = newNextExecutor; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getNext() + */ + @Override + public Executor<EnEvent, AxArtifactKey, AxState, ApexInternalContext> getNext() { + return nextExecutor; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getIncoming() + */ + @Override + public EnEvent getIncoming() { + return incomingEvent; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#getOutgoing() + */ + @Override + public AxArtifactKey getOutgoing() { + return outgoingTaskKey; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.Executor#setParameters(org.onap.policy.apex.core.engine. + * ExecutorParameters) + */ + @Override + public void setParameters(final ExecutorParameters parameters) {} +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/AxStateFacade.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/AxStateFacade.java new file mode 100644 index 000000000..226f06ade --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/AxStateFacade.java @@ -0,0 +1,110 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor.context; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.Set; + +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.basicmodel.service.ModelService; +import org.onap.policy.apex.model.policymodel.concepts.AxState; +import org.onap.policy.apex.model.policymodel.concepts.AxTasks; + +/** + * The Class AxStateFacade acts as a facade into the AxState class so that task logic can easily access information in + * an AxState instance. + * + * @author Sven van der Meer (sven.van.der.meer@ericsson.com) + */ +public class AxStateFacade { + // CHECKSTYLE:OFF: checkstyle:visibilityModifier Logic has access to this field + + /** The full definition information for the state. */ + public AxState state; + + // CHECKSTYLE:ON: checkstyle:visibilityModifier + + /** + * Instantiates a new AxState facade. + * + * @param state the state for which a facade is being presented + */ + public AxStateFacade(final AxState state) { + this.state = state; + } + + /** + * Gets the default task key of the state. + * + * @return the default task key + */ + public AxArtifactKey getDefaultTaskKey() { + return state.getDefaultTask(); + } + + /** + * Gets the ID of the state. + * + * @return the ID + */ + public String getId() { + return state.getKey().getID(); + } + + /** + * Gets the name of the state. + * + * @return the state name + */ + public String getStateName() { + return state.getKey().getLocalName(); + } + + /** + * Check if a task is defined for a given task name on a state and, if so, return its key. + * + * @param taskName the name of the task to get + * @return the task key or null if it does not exist + */ + public AxArtifactKey getTaskKey(final String taskName) { + if (taskName == null) { + return null; + } + + return ModelService.getModel(AxTasks.class).get(taskName).getKey(); + } + + /** + * Check if a task is defined for a given task name on a state and, if so, return its key. + * + * @return unmodifiable list of names of tasks available + */ + public List<String> getTaskNames() { + final Set<AxArtifactKey> tasks = state.getTaskReferences().keySet(); + final List<String> ret = new ArrayList<>(tasks.size()); + for (final AxArtifactKey task : tasks) { + ret.add(task.getName()); + } + return Collections.unmodifiableList(ret); + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/AxTaskFacade.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/AxTaskFacade.java new file mode 100644 index 000000000..015f3ae80 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/AxTaskFacade.java @@ -0,0 +1,131 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor.context; + +import org.onap.policy.apex.context.ContextRuntimeException; +import org.onap.policy.apex.context.SchemaHelper; +import org.onap.policy.apex.context.impl.schema.SchemaHelperFactory; +import org.onap.policy.apex.core.engine.event.EnException; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineRuntimeException; +import org.onap.policy.apex.model.eventmodel.concepts.AxField; +import org.onap.policy.apex.model.policymodel.concepts.AxTask; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * The Class AxTaskFacade acts as a facade into the AxTask class so that task logic can easily access information in an + * AxTask instance. + * + * @author Sven van der Meer (sven.van.der.meer@ericsson.com) + */ +public class AxTaskFacade { + // Logger for this class + private static final XLogger LOGGER = XLoggerFactory.getXLogger(AxTaskFacade.class); + + // CHECKSTYLE:OFF: checkstyle:visibilityModifier Logic has access to this field + + /** + * The full definition of the task we are presenting a facade to, executing logic has full access to the task + * definition. + */ + public AxTask task; + + // CHECKSTYLE:ON: checkstyle:visibilityModifier + + /** + * Instantiates a new AxTask facade. + * + * @param task the task for which a facade is being presented + */ + public AxTaskFacade(final AxTask task) { + this.task = task; + } + + /** + * Gets the name of the task. + * + * @return the task name + */ + public String getTaskName() { + return task.getKey().getName(); + } + + /** + * Gets the task ID. + * + * @return the task ID + */ + public String getId() { + return task.getID(); + } + + /** + * Creates a schema helper for an incoming field of this task. + * + * @param fieldName The name of the field to get a schema helper for + * @return the schema helper for this field + */ + public SchemaHelper getInFieldSchemaHelper(final String fieldName) { + // Find the field for the field name + return getFieldSchemaHelper(fieldName, task.getInputFields().get(fieldName), "incoming"); + } + + /** + * Creates a schema helper for an outgoing field of this task. + * + * @param fieldName The name of the field to get a schema helper for + * @return the schema helper for this field + */ + public SchemaHelper getOutFieldSchemaHelper(final String fieldName) { + // Find the field for the field name + return getFieldSchemaHelper(fieldName, task.getOutputFields().get(fieldName), "outgoing"); + } + + /** + * Creates a schema helper for an incoming field of this task. + * + * @param fieldName The name of the field to get a schema helper for + * @param field the field + * @param directionString the direction string + * @return the schema helper for this field + */ + private SchemaHelper getFieldSchemaHelper(final String fieldName, final AxField field, + final String directionString) { + // Find the field for the field name + if (field == null) { + final String message = "no " + directionString + " field with name \"" + fieldName + "\" defined on task \"" + + task.getID() + "\""; + LOGGER.warn(message); + throw new StateMachineRuntimeException(message); + } + + // Get a schema helper to handle translations of fields to and from the schema + try { + return new SchemaHelperFactory().createSchemaHelper(field.getKey(), field.getSchema()); + } catch (final ContextRuntimeException e) { + final String message = "schema helper cannot be created for task field \"" + fieldName + "\" with key \"" + + field.getID() + "\" with schema \"" + field.getSchema() + "\""; + LOGGER.warn(message, e); + throw new EnException(message, e); + } + } + +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/StateFinalizerExecutionContext.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/StateFinalizerExecutionContext.java new file mode 100644 index 000000000..2e5971142 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/StateFinalizerExecutionContext.java @@ -0,0 +1,194 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor.context; + +import java.util.ArrayList; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.TreeMap; + +import org.onap.policy.apex.context.ContextAlbum; +import org.onap.policy.apex.context.ContextRuntimeException; +import org.onap.policy.apex.core.engine.context.ApexInternalContext; +import org.onap.policy.apex.core.engine.executor.Executor; +import org.onap.policy.apex.core.engine.executor.StateFinalizerExecutor; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.basicmodel.concepts.AxConcept; +import org.onap.policy.apex.model.policymodel.concepts.AxState; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * Container class for the execution context for state finalizer logic executions in a state being executed in an Apex + * engine. The state finalizer must have easy access to the state definition, the fields, as well as the policy, global, + * and external context. + * + * @author Sven van der Meer (sven.van.der.meer@ericsson.com) + */ +public class StateFinalizerExecutionContext { + /** + * Logger for state finalizer execution, state finalizer logic can use this field to access and log to Apex logging. + */ + private static final XLogger EXCEUTION_LOGGER = + XLoggerFactory.getXLogger("org.onap.policy.apex.executionlogging.StateFinalizerExecutionLogging"); + + // CHECKSTYLE:OFF: checkstyle:VisibilityModifier Logic has access to these field + + /** A facade to the full state definition for the state finalizer logic being executed. */ + public final AxStateFacade subject; + + /** the execution ID for the current APEX policy execution instance. */ + public final Long executionID; + + /** + * The list of state outputs for this state finalizer. The purpose of a state finalizer is to select a state output + * for a state from this list of state output names. + */ + public final Set<String> stateOutputNames; + + /** + * The fields of this state finalizer. A state finalizer receives this list of fields from a task and may use these + * fields to determine what state output to select. Once a state finalizer has selected a state output, it must + * marshal these fields so that they match the fields required for the event defined in the state output. + */ + public Map<String, Object> fields; + + // A message specified in the logic + private String message; + + /** + * The state output that the state finalizer logic has selected for a state. The state finalizer logic sets this + * field in its logic after executing and the Apex engine uses this state output for this state. + */ + private String selectedStateOutputName; + + /** + * Logger for state finalizer execution, state finalizer logic can use this field to access and log to Apex logging. + */ + public final XLogger logger = EXCEUTION_LOGGER; + + // CHECKSTYLE:ON: checkstyle:visibilityModifier + + // All available context albums + private final Map<String, ContextAlbum> context; + + /** + * Instantiates a new state finalizer execution context. + * + * @param stateFinalizerExecutor the state finalizer executor that requires context + * @param executionID the execution ID for the current APEX policy execution instance + * @param axState the state definition that is the subject of execution + * @param fields the fields to be manipulated by the state finalizer + * @param stateOutputNames the state output names, one of which will be selected by the state finalizer + * @param internalContext the execution context of the Apex engine in which the task is being executed + */ + public StateFinalizerExecutionContext(final StateFinalizerExecutor stateFinalizerExecutor, final long executionID, + final AxState axState, final Map<String, Object> fields, final Set<String> stateOutputNames, + final ApexInternalContext internalContext) { + subject = new AxStateFacade(axState); + + // Execution ID is the current policy execution instance + this.executionID = executionID; + + this.fields = fields; + this.stateOutputNames = stateOutputNames; + + // Set up the context albums for this task + context = new TreeMap<>(); + for (final AxArtifactKey mapKey : subject.state.getContextAlbumReferences()) { + context.put(mapKey.getName(), internalContext.getContextAlbums().get(mapKey)); + } + + // Get the artifact stack of the users of the policy + final List<AxConcept> usedArtifactStack = new ArrayList<>(); + for (Executor<?, ?, ?, ?> parent = stateFinalizerExecutor.getParent(); parent != null; parent = + parent.getParent()) { + // Add each parent to the top of the stack + usedArtifactStack.add(0, parent.getKey()); + } + + // Change the stack to an array + final AxConcept[] usedArtifactStackArray = usedArtifactStack.toArray(new AxConcept[usedArtifactStack.size()]); + + // Set the user of the context + // Set the user of the context + for (final ContextAlbum contextAlbum : context.values()) { + contextAlbum.setUserArtifactStack(usedArtifactStackArray); + } + } + + /** + * Return a context album if it exists in the context definition of this state. + * + * @param contextAlbumName The context album name + * @return The context album + * @throws ContextRuntimeException if the context album does not exist on the state for this executor + */ + public ContextAlbum getContextAlbum(final String contextAlbumName) throws ContextRuntimeException { + // Find the context album + final ContextAlbum foundContextAlbum = context.get(contextAlbumName); + + // Check if the context album exists + if (foundContextAlbum != null) { + return foundContextAlbum; + } else { + throw new ContextRuntimeException("cannot find definition of context album \"" + contextAlbumName + + "\" on state \"" + subject.getId() + "\""); + } + } + + /** + * Return the state output name selected by the state finalizer logic. + * + * @return the state output name + */ + public String getSelectedStateOutputName() { + return selectedStateOutputName; + } + + /** + * Set the state output name selected by the state finalizer logic. + * + * @param selectedStateOutputName the state output name + */ + public void setSelectedStateOutputName(final String selectedStateOutputName) { + this.selectedStateOutputName = selectedStateOutputName; + } + + /** + * Gets the user message. + * + * @return the user message + */ + public String getMessage() { + return message; + } + + /** + * Sets the user message. + * + * @param message the message + */ + public void setMessage(final String message) { + this.message = message; + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/TaskExecutionContext.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/TaskExecutionContext.java new file mode 100644 index 000000000..2251cf5c1 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/TaskExecutionContext.java @@ -0,0 +1,174 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor.context; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.Map; +import java.util.TreeMap; + +import org.onap.policy.apex.context.ContextAlbum; +import org.onap.policy.apex.context.ContextRuntimeException; +import org.onap.policy.apex.core.engine.context.ApexInternalContext; +import org.onap.policy.apex.core.engine.executor.Executor; +import org.onap.policy.apex.core.engine.executor.TaskExecutor; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.basicmodel.concepts.AxConcept; +import org.onap.policy.apex.model.policymodel.concepts.AxTask; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * Container class for the execution context for Task logic executions in a task being executed in an Apex engine. The + * task must have easy access to the task definition, the incoming and outgoing field contexts, as well as the policy, + * global, and external context. + * + * @author Sven van der Meer (sven.van.der.meer@ericsson.com) + */ +public class TaskExecutionContext { + // Logger for task execution + private static final XLogger EXECUTION_LOGGER = + XLoggerFactory.getXLogger("org.onap.policy.apex.executionlogging.TaskExecutionLogging"); + + // CHECKSTYLE:OFF: checkstyle:VisibilityModifier Logic has access to these field + + /** A constant <code>boolean true</code> value available for reuse e.g., for the return value */ + public final Boolean TRUE = true; + + /** A constant <code>boolean false</code> value available for reuse e.g., for the return value */ + public final Boolean FALSE = false; + + /** A facade to the full task definition for the task logic being executed. */ + public final AxTaskFacade subject; + + /** the execution ID for the current APEX policy execution instance. */ + public final Long executionID; + + /** + * The incoming fields from the trigger event for the task. The task logic can access these fields when executing + * its logic. + */ + public final Map<String, Object> inFields; + + /** + * The outgoing fields from the task. The task logic can access and set these fields with its logic. A task outputs + * its result using these fields. + */ + public final Map<String, Object> outFields; + + /** Logger for task execution, task logic can use this field to access and log to Apex logging. */ + public final XLogger logger = EXECUTION_LOGGER; + + // CHECKSTYLE:ON: checkstyle:VisibilityModifier + + // All available context albums + private final Map<String, ContextAlbum> context; + + // The artifact stack of users of this context + private final List<AxConcept> usedArtifactStack; + + // A message specified in the logic + private String message; + + /** + * Instantiates a new task execution context. + * + * @param taskExecutor the task executor that requires context + * @param executionID the execution ID for the current APEX policy execution instance + * @param axTask the task definition that is the subject of execution + * @param inFields the in fields + * @param outFields the out fields + * @param internalContext the execution context of the Apex engine in which the task is being executed + */ + public TaskExecutionContext(final TaskExecutor taskExecutor, final long executionID, final AxTask axTask, + final Map<String, Object> inFields, final Map<String, Object> outFields, + final ApexInternalContext internalContext) { + // The subject is the task definition + subject = new AxTaskFacade(axTask); + + // Execution ID is the current policy execution instance + this.executionID = executionID; + + // The input and output fields + this.inFields = Collections.unmodifiableMap(inFields); + this.outFields = outFields; + + // Set up the context albums for this task + context = new TreeMap<>(); + for (final AxArtifactKey mapKey : subject.task.getContextAlbumReferences()) { + context.put(mapKey.getName(), internalContext.getContextAlbums().get(mapKey)); + } + + // Get the artifact stack of the users of the policy + usedArtifactStack = new ArrayList<>(); + for (Executor<?, ?, ?, ?> parent = taskExecutor.getParent(); parent != null; parent = parent.getParent()) { + // Add each parent to the top of the stack + usedArtifactStack.add(0, parent.getKey()); + } + + // Change the stack to an array + final AxConcept[] usedArtifactStackArray = usedArtifactStack.toArray(new AxConcept[usedArtifactStack.size()]); + + // Set the user of the context + for (final ContextAlbum contextAlbum : context.values()) { + contextAlbum.setUserArtifactStack(usedArtifactStackArray); + } + } + + /** + * Return a context album if it exists in the context definition of this task. + * + * @param contextAlbumName The context album name + * @return The context album + * @throws ContextRuntimeException if the context album does not exist on the task for this executor + */ + public ContextAlbum getContextAlbum(final String contextAlbumName) throws ContextRuntimeException { + // Find the context album + final ContextAlbum foundContextAlbum = context.get(contextAlbumName); + + // Check if the context album exists + if (foundContextAlbum != null) { + return foundContextAlbum; + } else { + throw new ContextRuntimeException("cannot find definition of context album \"" + contextAlbumName + + "\" on task \"" + subject.getId() + "\""); + } + } + + /** + * Get the user message. + * + * @return the user message + */ + public String getMessage() { + return message; + } + + /** + * Sets the user message. + * + * @param message the message + */ + public void setMessage(final String message) { + this.message = message; + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/TaskSelectionExecutionContext.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/TaskSelectionExecutionContext.java new file mode 100644 index 000000000..a196e360e --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/TaskSelectionExecutionContext.java @@ -0,0 +1,180 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor.context; + +import java.util.ArrayList; +import java.util.List; +import java.util.Map; +import java.util.TreeMap; + +import org.onap.policy.apex.context.ContextAlbum; +import org.onap.policy.apex.context.ContextRuntimeException; +import org.onap.policy.apex.core.engine.context.ApexInternalContext; +import org.onap.policy.apex.core.engine.event.EnEvent; +import org.onap.policy.apex.core.engine.executor.Executor; +import org.onap.policy.apex.core.engine.executor.TaskSelectExecutor; +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.basicmodel.concepts.AxConcept; +import org.onap.policy.apex.model.policymodel.concepts.AxState; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * Container class for the execution context for Task Selection logic executions in a task being executed in an Apex + * engine. The task must have easy access to the state definition, the incoming and outgoing event contexts, as well as + * the policy, global, and external context. + * + * @author Sven van der Meer (sven.van.der.meer@ericsson.com) + */ +public class TaskSelectionExecutionContext { + // Logger for task execution + private static final XLogger EXECUTION_LOGGER = + XLoggerFactory.getXLogger("org.onap.policy.apex.executionlogging.TaskSelectionExecutionLogging"); + + // CHECKSTYLE:OFF: checkstyle:VisibilityModifier Logic has access to these field + + /** A constant <code>boolean true</code> value available for reuse e.g., for the return value */ + public final Boolean TRUE = true; + + /** A constant <code>boolean false</code> value available for reuse e.g., for the return value */ + public final Boolean FALSE = false; + + /** A facade to the full state definition for the task selection logic being executed. */ + public final AxStateFacade subject; + + /** the execution ID for the current APEX policy execution instance. */ + public final Long executionID; + + /** + * The incoming fields from the trigger event for the state. The task selection logic can access these fields to + * decide what task to select for the state. + */ + public final Map<String, Object> inFields; + + /** + * The task that the task selection logic has selected for a state. The task selection logic sets this field in its + * logic prior to executing and the Apex engine executes this task as the task for this state. + */ + public final AxArtifactKey selectedTask; + + /** + * Logger for task selection execution, task selection logic can use this field to access and log to Apex logging. + */ + public final XLogger logger = EXECUTION_LOGGER; + + // CHECKSTYLE:ON: checkstyle:VisibilityModifier + + // All available context albums + private final Map<String, ContextAlbum> context; + + // A message specified in the logic + private String message; + + /** + * Instantiates a new task selection execution context. + * + * @param taskSelectExecutor the task selection executor that requires context + * @param executionID the execution identifier + * @param axState the state definition that is the subject of execution + * @param incomingEvent the incoming event for the state + * @param outgoingKey the outgoing key for the task to execute in this state + * @param internalContext the execution context of the Apex engine in which the task is being executed + */ + public TaskSelectionExecutionContext(final TaskSelectExecutor taskSelectExecutor, final long executionID, + final AxState axState, final EnEvent incomingEvent, final AxArtifactKey outgoingKey, + final ApexInternalContext internalContext) { + // The subject is the state definition + subject = new AxStateFacade(axState); + + // Execution ID is the current policy execution instance + this.executionID = executionID; + + // The events + inFields = incomingEvent; + selectedTask = outgoingKey; + + // Set up the context albums for this task + // Set up the context albums for this task + context = new TreeMap<>(); + for (final AxArtifactKey mapKey : subject.state.getContextAlbumReferences()) { + context.put(mapKey.getName(), internalContext.getContextAlbums().get(mapKey)); + } + + // Get the artifact stack of the users of the policy + final List<AxConcept> usedArtifactStack = new ArrayList<>(); + for (Executor<?, ?, ?, ?> parent = taskSelectExecutor.getParent(); parent != null; parent = + parent.getParent()) { + // Add each parent to the top of the stack + usedArtifactStack.add(0, parent.getKey()); + } + + // Add the events to the artifact stack + usedArtifactStack.add(incomingEvent.getKey()); + + // Change the stack to an array + final AxConcept[] usedArtifactStackArray = usedArtifactStack.toArray(new AxConcept[usedArtifactStack.size()]); + + // Set the user of the context + // Set the user of the context + for (final ContextAlbum contextAlbum : context.values()) { + contextAlbum.setUserArtifactStack(usedArtifactStackArray); + } + incomingEvent.setUserArtifactStack(usedArtifactStackArray); + } + + /** + * Return a context album if it exists in the context definition of this state. + * + * @param contextAlbumName The context album name + * @return The context albumxxxxxx + * @throws ContextRuntimeException if the context album does not exist on the state for this executor + */ + public ContextAlbum getContextAlbum(final String contextAlbumName) throws ContextRuntimeException { + // Find the context album + final ContextAlbum foundContextAlbum = context.get(contextAlbumName); + + // Check if the context album exists + if (foundContextAlbum != null) { + return foundContextAlbum; + } else { + throw new ContextRuntimeException("cannot find definition of context album \"" + contextAlbumName + + "\" on state \"" + subject.getId() + "\""); + } + } + + /** + * Gets the user message. + * + * @return the user message + */ + public String getMessage() { + return message; + } + + /** + * Sets the user message. + * + * @param message the message + */ + public void setMessage(final String message) { + this.message = message; + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/package-info.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/package-info.java new file mode 100644 index 000000000..6dc555107 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/context/package-info.java @@ -0,0 +1,33 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +/** + * Provides context and facades for executing tasks, task selection logic, and state finalizer logic. The public fields + * and methods of {@link TaskExecutionContext}, {@link TaskSelectionExecutionContext} and + * {@link StateFinalizerExecutionContext} are available to task logic, task selection logic, and state finalizer logic + * respectively when that logic is executing in an executor plugin under the control of an APEX engine. + * + * The {@link AxStateFacade} and {@link AxTaskFacade} classes provide facades and convenience methods for state and task + * definition information for logic at execution time. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ + +package org.onap.policy.apex.core.engine.executor.context; diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/exception/StateMachineException.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/exception/StateMachineException.java new file mode 100644 index 000000000..9d6c55900 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/exception/StateMachineException.java @@ -0,0 +1,51 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor.exception; + +import org.onap.policy.apex.model.basicmodel.concepts.ApexException; + +/** + * This class will be called if an error occurs in an Apex state machine. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public class StateMachineException extends ApexException { + private static final long serialVersionUID = -4245694568321686450L; + + /** + * Instantiates a new state machine exception. + * + * @param message the message + */ + public StateMachineException(final String message) { + super(message); + } + + /** + * Instantiates a new state machine exception. + * + * @param message the message + * @param e the e + */ + public StateMachineException(final String message, final Exception e) { + super(message, e); + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/exception/StateMachineRuntimeException.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/exception/StateMachineRuntimeException.java new file mode 100644 index 000000000..9ce2d7499 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/exception/StateMachineRuntimeException.java @@ -0,0 +1,51 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor.exception; + +import org.onap.policy.apex.model.basicmodel.concepts.ApexRuntimeException; + +/** + * This class will be called if a runtime error occurs in an Apex state machine. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public class StateMachineRuntimeException extends ApexRuntimeException { + private static final long serialVersionUID = -4245694568321686450L; + + /** + * Instantiates a new state machine exception. + * + * @param message the message + */ + public StateMachineRuntimeException(final String message) { + super(message); + } + + /** + * Instantiates a new state machine exception. + * + * @param message the message + * @param e the e + */ + public StateMachineRuntimeException(final String message, final Exception e) { + super(message, e); + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/exception/package-info.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/exception/package-info.java new file mode 100644 index 000000000..1cb433946 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/exception/package-info.java @@ -0,0 +1,27 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +/** + * Contains exceptions that may be thrown during execution of an APEX engine. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ + +package org.onap.policy.apex.core.engine.executor.exception; diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/impl/ExecutorFactoryImpl.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/impl/ExecutorFactoryImpl.java new file mode 100644 index 000000000..58ee4c6cc --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/impl/ExecutorFactoryImpl.java @@ -0,0 +1,235 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.executor.impl; + +import java.util.Map; +import java.util.Map.Entry; +import java.util.TreeMap; + +import org.onap.policy.apex.core.engine.EngineParameters; +import org.onap.policy.apex.core.engine.ExecutorParameters; +import org.onap.policy.apex.core.engine.context.ApexInternalContext; +import org.onap.policy.apex.core.engine.executor.Executor; +import org.onap.policy.apex.core.engine.executor.ExecutorFactory; +import org.onap.policy.apex.core.engine.executor.StateFinalizerExecutor; +import org.onap.policy.apex.core.engine.executor.TaskExecutor; +import org.onap.policy.apex.core.engine.executor.TaskSelectExecutor; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineException; +import org.onap.policy.apex.core.engine.executor.exception.StateMachineRuntimeException; +import org.onap.policy.apex.model.basicmodel.service.ParameterService; +import org.onap.policy.apex.model.policymodel.concepts.AxState; +import org.onap.policy.apex.model.policymodel.concepts.AxStateFinalizerLogic; +import org.onap.policy.apex.model.policymodel.concepts.AxTask; +import org.onap.policy.apex.model.utilities.Assertions; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * The Class ExecutorFactoryImpl is a factory class that returns task selection logic and task logic executors depending + * on the type of logic executor has been specified for the task selection logic in a state or task logic in a task. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public class ExecutorFactoryImpl extends ExecutorFactory { + // Get a reference to the logger + private static final XLogger LOGGER = XLoggerFactory.getXLogger(ExecutorFactoryImpl.class); + + // A map of logic flavours mapped to executor classes for plugins to executors for those logic flavours + private Map<String, Class<Executor<?, ?, ?, ?>>> taskExecutorPluginClassMap = + new TreeMap<String, Class<Executor<?, ?, ?, ?>>>(); + private Map<String, Class<Executor<?, ?, ?, ?>>> taskSelectionExecutorPluginClassMap = + new TreeMap<String, Class<Executor<?, ?, ?, ?>>>(); + private Map<String, Class<Executor<?, ?, ?, ?>>> stateFinalizerExecutorPluginClassMap = + new TreeMap<String, Class<Executor<?, ?, ?, ?>>>(); + + // A map of parameters for executors + private final Map<String, ExecutorParameters> implementationParameterMap = + new TreeMap<String, ExecutorParameters>(); + + /** + * Constructor, builds the class map for executors. + * + * @throws StateMachineException on plugin creation errors + */ + public ExecutorFactoryImpl() throws StateMachineException { + final EngineParameters engineParameters = ParameterService.getParameters(EngineParameters.class); + + Assertions.argumentNotNull(engineParameters, StateMachineException.class, + "Parameter \"engineParameters\" may not be null"); + + // Instantiate each executor class map entry + for (final Entry<String, ExecutorParameters> executorParameterEntry : engineParameters.getExecutorParameterMap() + .entrySet()) { + // Get classes for all types of executors for this logic type + taskExecutorPluginClassMap.put(executorParameterEntry.getKey(), + getExecutorPluginClass(executorParameterEntry.getValue().getTaskExecutorPluginClass())); + taskSelectionExecutorPluginClassMap.put(executorParameterEntry.getKey(), + getExecutorPluginClass(executorParameterEntry.getValue().getTaskSelectionExecutorPluginClass())); + stateFinalizerExecutorPluginClassMap.put(executorParameterEntry.getKey(), + getExecutorPluginClass(executorParameterEntry.getValue().getStateFinalizerExecutorPluginClass())); + + // Save the executor implementation parameters + implementationParameterMap.put(executorParameterEntry.getKey(), executorParameterEntry.getValue()); + } + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.executor.ExecutorFactory#getTaskSelectionExecutor(org.onap.policy.apex.core. + * model. concepts.AxState, org.onap.policy.apex.core.engine.context.Context) + */ + @Override + public TaskSelectExecutor getTaskSelectionExecutor(final Executor<?, ?, ?, ?> parentExecutor, final AxState state, + final ApexInternalContext context) { + if (!state.checkSetTaskSelectionLogic()) { + return null; + } + + // Create task selection executor + final TaskSelectExecutor tsExecutor = + (TaskSelectExecutor) createExecutor(state.getTaskSelectionLogic().getLogicFlavour(), + taskSelectionExecutorPluginClassMap.get(state.getTaskSelectionLogic().getLogicFlavour()), + TaskSelectExecutor.class); + tsExecutor.setParameters(implementationParameterMap.get(state.getTaskSelectionLogic().getLogicFlavour())); + tsExecutor.setContext(parentExecutor, state, context); + + return tsExecutor; + } + + /* + * (non-Javadoc) + * + * @see org.onap.policy.apex.core.engine.executor.ExecutorFactory#getTaskExecutor(org.onap.policy.apex.core.model. + * concepts. AxTask, org.onap.policy.apex.core.engine.context.Context) + */ + @Override + public TaskExecutor getTaskExecutor(final Executor<?, ?, ?, ?> parentExecutor, final AxTask task, + final ApexInternalContext context) { + // Create task executor + final TaskExecutor taskExecutor = (TaskExecutor) createExecutor(task.getTaskLogic().getLogicFlavour(), + taskExecutorPluginClassMap.get(task.getTaskLogic().getLogicFlavour()), TaskExecutor.class); + taskExecutor.setParameters(implementationParameterMap.get(task.getTaskLogic().getLogicFlavour())); + taskExecutor.setContext(parentExecutor, task, context); + + return taskExecutor; + } + + /* + * (non-Javadoc) + * + * @see + * org.onap.policy.apex.core.engine.executor.ExecutorFactory#getStateFinalizerExecutor(org.onap.policy.apex.core. + * engine. executor.Executor, org.onap.policy.apex.core.policymodel.concepts.AxStateFinalizerLogic, + * org.onap.policy.apex.core.engine.context.ApexInternalContext) + */ + @Override + public StateFinalizerExecutor getStateFinalizerExecutor(final Executor<?, ?, ?, ?> parentExecutor, + final AxStateFinalizerLogic logic, final ApexInternalContext context) { + // Create state finalizer executor + final StateFinalizerExecutor sfExecutor = (StateFinalizerExecutor) createExecutor(logic.getLogicFlavour(), + stateFinalizerExecutorPluginClassMap.get(logic.getLogicFlavour()), StateFinalizerExecutor.class); + sfExecutor.setParameters(implementationParameterMap.get(logic.getLogicFlavour())); + sfExecutor.setContext(parentExecutor, logic, context); + + return sfExecutor; + } + + /** + * Get an executor class for a given executor plugin class name. + * + * @param executorClassName The name of the executor plugin class + * @return an executor class + * @throws StateMachineException on plugin instantiation errors + */ + @SuppressWarnings("unchecked") + private Class<Executor<?, ?, ?, ?>> getExecutorPluginClass(final String executorClassName) + throws StateMachineException { + // It's OK for an executor class not to be defined as long as it's not called + if (executorClassName == null) { + return null; + } + + // Get the class for the executor using reflection + Class<? extends Object> executorPluginClass = null; + try { + executorPluginClass = Class.forName(executorClassName); + } catch (final ClassNotFoundException e) { + LOGGER.error("Apex executor class not found for executor plugin \"" + executorClassName + "\"", e); + throw new StateMachineException( + "Apex executor class not found for executor plugin \"" + executorClassName + "\"", e); + } + + // Check the class is an executor + if (!Executor.class.isAssignableFrom(executorPluginClass)) { + LOGGER.error("Specified Apex executor plugin class \"" + executorClassName + + "\" does not implment the Executor interface"); + throw new StateMachineException("Specified Apex executor plugin class \"" + executorClassName + + "\" does not implment the Executor interface"); + } + + return (Class<Executor<?, ?, ?, ?>>) executorPluginClass; + } + + /** + * Get an instance of an executor plugin class of the specified type and super type. + * + * @param logicFlavour The logic flavour of the logic + * @param executorClass The sub-class of the executor type to be instantiated + * @param executorSuperClass The super type of the class of executor to be instantiated + * @return The instantiated class + */ + private Executor<?, ?, ?, ?> createExecutor(final String logicFlavour, + final Class<Executor<?, ?, ?, ?>> executorClass, + final Class<? extends Executor<?, ?, ?, ?>> executorSuperClass) { + // It's OK for an executor class not to be defined but it's not all right to try and create a non-defined + // executor class + if (executorClass == null) { + final String errorMessage = "Executor plugin class not defined for \"" + logicFlavour + + "\" executor of type \"" + executorSuperClass.getCanonicalName() + "\""; + LOGGER.error(errorMessage); + throw new StateMachineRuntimeException(errorMessage); + } + + // Create an executor for the specified logic flavour + Object executorObject = null; + try { + executorObject = executorClass.newInstance(); + } catch (InstantiationException | IllegalAccessException e) { + final String errorMessage = "Instantiation error on \"" + logicFlavour + "\" executor of type \"" + + executorClass.getCanonicalName() + "\""; + LOGGER.error(errorMessage, e); + throw new StateMachineRuntimeException(errorMessage, e); + } + + // Check the class is a Task Selection Executor + if (!(executorSuperClass.isAssignableFrom(executorObject.getClass()))) { + final String errorMessage = "Executor on \"" + logicFlavour + "\" of type \"" + executorClass + + "\" is not an instance of \"" + executorSuperClass.getCanonicalName() + "\""; + + LOGGER.error(errorMessage); + throw new StateMachineRuntimeException(errorMessage); + } + + return (Executor<?, ?, ?, ?>) executorObject; + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/impl/package-info.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/impl/package-info.java new file mode 100644 index 000000000..66e23e667 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/impl/package-info.java @@ -0,0 +1,27 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +/** + * Contains factories for creating executors for tasks, state fianlizers, and task selectors. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ + +package org.onap.policy.apex.core.engine.executor.impl; diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/package-info.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/package-info.java new file mode 100644 index 000000000..062e1ae49 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/executor/package-info.java @@ -0,0 +1,27 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +/** + * Implements state, task, task selection, and state finalizer execution for the APEX engine. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ + +package org.onap.policy.apex.core.engine.executor; diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/monitoring/EventMonitor.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/monitoring/EventMonitor.java new file mode 100644 index 000000000..9710b106e --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/monitoring/EventMonitor.java @@ -0,0 +1,114 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.core.engine.monitoring; + +import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey; +import org.onap.policy.apex.model.basicmodel.concepts.AxConcept; +import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey; +import org.onap.policy.apex.model.eventmodel.concepts.AxField; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * This class is used to monitor event parameter gets and sets. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public class EventMonitor { + // Logger for this class + private static final XLogger LOGGER = XLoggerFactory.getXLogger(EventMonitor.class); + + /** + * Monitor get on an event parameter. + * + * @param eventParameter The event parameter to monitor + * @param value the value of the event parameter + * @param userArtifactStack the keys of the artifacts using the event at the moment + */ + public void monitorGet(final AxField eventParameter, final Object value, final AxConcept[] userArtifactStack) { + LOGGER.trace(monitor("GET", userArtifactStack, eventParameter, value)); + } + + /** + * Monitor set on an event parameter. + * + * @param eventParameter The event parameter to monitor + * @param value the value of the event parameter + * @param userArtifactStack the keys of the artifacts using the event at the moment + */ + public void monitorSet(final AxField eventParameter, final Object value, final AxConcept[] userArtifactStack) { + LOGGER.trace(monitor("SET", userArtifactStack, eventParameter, value)); + } + + /** + * Monitor remove on an event parameter. + * + * @param eventParameter The event parameter to monitor + * @param removedValue the value of the event parameter + * @param userArtifactStack the keys of the artifacts using the event at the moment + */ + public void monitorRemove(final AxField eventParameter, final Object removedValue, + final AxConcept[] userArtifactStack) { + LOGGER.trace(monitor("REMOVE", userArtifactStack, eventParameter, removedValue)); + } + + /** + * Monitor the user artifact stack. + * + * @param preamble the preamble + * @param userArtifactStack The user stack to print + * @param eventParameter The event parameter that we are monitoring + * @param value The value of the target object + * @return the string + */ + private String monitor(final String preamble, final AxConcept[] userArtifactStack, final AxField eventParameter, + final Object value) { + final StringBuilder builder = new StringBuilder(); + + builder.append(preamble); + builder.append(",["); + + if (userArtifactStack != null) { + boolean first = true; + for (final AxConcept stackKey : userArtifactStack) { + if (first) { + first = false; + } else { + builder.append(','); + } + if (stackKey instanceof AxArtifactKey) { + builder.append(((AxArtifactKey) stackKey).getID()); + } else if (stackKey instanceof AxReferenceKey) { + builder.append(((AxReferenceKey) stackKey).getID()); + } else { + builder.append(stackKey.toString()); + } + } + } + builder.append("],"); + + builder.append(eventParameter.toString()); + builder.append("="); + builder.append(value); + + return builder.toString(); + } +} diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/monitoring/package-info.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/monitoring/package-info.java new file mode 100644 index 000000000..530041a23 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/monitoring/package-info.java @@ -0,0 +1,28 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +/** + * Provides monitoring of APEX policy execution. It monitors events as they trigger Apex policies, pass between the + * various states of a policy, and are emitted by a policy. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ + +package org.onap.policy.apex.core.engine.monitoring; diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/package-info.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/package-info.java new file mode 100644 index 000000000..a836cd949 --- /dev/null +++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/package-info.java @@ -0,0 +1,30 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +/** + * Provides the core engine implementation for Apex. It builds a state machine for execution for each policy in its + * policy model. It provides the infrastructure for running policies and their states, for running executors provided by + * executor plugins, for supplying events and context to running policies, states, and tasks, and for handling event + * transmission into and out of policies and between states in policies. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ + +package org.onap.policy.apex.core.engine; |