validation for vnfs before WorkflowAction starts

Removed accidental merge markup from WorkflowActionBB
Addition of prevalidation to WorkflowActionBB.
Implement more JUnits for validation methods.
Implement verification of deleteInstance workflow for VNR configuration
dependencies.
Added a validation mechanism on a workflow level to check for valid
actions.

Change-Id: Icb2859c3b8ece534d4e9831ca5f48a15dfaef58d
Issue-ID: SO-1379
Signed-off-by: Benjamin, Max (mb388a) <mb388a@us.att.com>

4 files changed, 243 insertions, 0 deletions

diff --git a/bpmn/MSOCommonBPMN/src/main/java/org/onap/so/bpmn/common/validation/PostWorkflowValidator.java b/bpmn/MSOCommonBPMN/src/main/java/org/onap/so/bpmn/common/validation/PostWorkflowValidator.java
new file mode 100644
index 0000000000..46b3c571d5
--- /dev/null
+++ b/bpmn/MSOCommonBPMN/src/main/java/org/onap/so/bpmn/common/validation/PostWorkflowValidator.java
@@ -0,0 +1,25 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - SO
+ * ================================================================================
+ * Copyright (C) 2017 - 2018 AT&T Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.so.bpmn.common.validation;
+
+public interface PostWorkflowValidator extends WorkflowValidator {
+
+}
diff --git a/bpmn/MSOCommonBPMN/src/main/java/org/onap/so/bpmn/common/validation/PreWorkflowValidator.java b/bpmn/MSOCommonBPMN/src/main/java/org/onap/so/bpmn/common/validation/PreWorkflowValidator.java
new file mode 100644
index 0000000000..4dad1eafc4
--- /dev/null
+++ b/bpmn/MSOCommonBPMN/src/main/java/org/onap/so/bpmn/common/validation/PreWorkflowValidator.java
@@ -0,0 +1,25 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - SO
+ * ================================================================================
+ * Copyright (C) 2017 - 2018 AT&T Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.so.bpmn.common.validation;
+
+public interface PreWorkflowValidator extends WorkflowValidator {
+
+}
diff --git a/bpmn/MSOCommonBPMN/src/main/java/org/onap/so/bpmn/common/validation/WorkflowValidator.java b/bpmn/MSOCommonBPMN/src/main/java/org/onap/so/bpmn/common/validation/WorkflowValidator.java
new file mode 100644
index 0000000000..348f91321c
--- /dev/null
+++ b/bpmn/MSOCommonBPMN/src/main/java/org/onap/so/bpmn/common/validation/WorkflowValidator.java
@@ -0,0 +1,44 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - SO
+ * ================================================================================
+ * Copyright (C) 2017 - 2018 AT&T Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.so.bpmn.common.validation;
+
+import java.util.Set;
+
+import org.camunda.bpm.engine.delegate.DelegateExecution;
+
+public interface WorkflowValidator {
+
+	
+	/**
+	 * Name of the workflow action to be validated
+	 * @return
+	 */
+	public Set<String> forWorkflowAction();
+	
+	/**
+	 * Determines whether or not the workflow should be executed
+	 * 
+	 * @param execution
+	 * @return
+	 */
+	public boolean validate(DelegateExecution execution);
+	
+}
diff --git a/bpmn/MSOCommonBPMN/src/main/java/org/onap/so/bpmn/common/validation/WorkflowValidatorRunner.java b/bpmn/MSOCommonBPMN/src/main/java/org/onap/so/bpmn/common/validation/WorkflowValidatorRunner.java
new file mode 100644
index 0000000000..44fbc6d629
--- /dev/null
+++ b/bpmn/MSOCommonBPMN/src/main/java/org/onap/so/bpmn/common/validation/WorkflowValidatorRunner.java
@@ -0,0 +1,149 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - SO
+ * ================================================================================
+ * Copyright (C) 2017 - 2018 AT&T Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.so.bpmn.common.validation;
+
+import java.lang.annotation.Annotation;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+import javax.annotation.PostConstruct;
+import javax.annotation.Priority;
+
+import org.camunda.bpm.engine.delegate.DelegateExecution;
+import org.javatuples.Pair;
+import org.onap.so.client.exception.ExceptionBuilder;
+import org.reflections.Reflections;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+import org.springframework.stereotype.Component;
+
+
+/**
+ * Controls running all pre and post validation for workflows.
+ * 
+ * To define a validation you must make it a spring bean and implement either {@link org.onap.so.bpmn.common.validation.PreWorkflowValidator} or 
+ * {@link org.onap.so.bpmn.common.validation.PostWorkflowValidator} your validation will automatically be
+ * run by this class.
+ *
+ */
+@Component
+public class WorkflowValidatorRunner {
+
+	private static Logger logger = LoggerFactory.getLogger(WorkflowValidatorRunner.class);
+	@Autowired
+	private ApplicationContext context;
+	
+	@Autowired
+	private ExceptionBuilder exceptionBuilder;
+	
+	private List<PreWorkflowValidator> preWorkflowValidators;
+	private List<PostWorkflowValidator> postWorkflowValidators;
+
+	
+	@PostConstruct
+	protected void init() {
+		
+		preWorkflowValidators = new ArrayList<>(
+				Optional.ofNullable(context.getBeansOfType(PreWorkflowValidator.class)).orElse(new HashMap<>()).values());
+		postWorkflowValidators = new ArrayList<>(
+				Optional.ofNullable(context.getBeansOfType(PostWorkflowValidator.class)).orElse(new HashMap<>()).values());
+	}
+	
+	public boolean preValidate(String workflow, DelegateExecution execution) {
+		return validate(preWorkflowValidators, workflow, execution);
+	}
+	
+	
+	public boolean postValidate(String workflow, DelegateExecution execution) {
+		return validate(postWorkflowValidators, workflow, execution);
+	}
+	
+	
+	protected boolean validate(List<? extends WorkflowValidator> validators, String workflow, DelegateExecution execution) {
+		List<Pair<String, Boolean>> results = runValidations(validators, workflow, execution);
+		
+		if (!results.isEmpty()) {
+			exceptionBuilder.buildAndThrowWorkflowException(execution, 7000,
+					"Failed Validations:\n" + results.stream().map(item -> item.getValue0()).collect(Collectors.joining("\n")));
+		}
+		
+		return true;
+		
+	}
+	protected List<Pair<String, Boolean>> runValidations(List<? extends WorkflowValidator> validators, String workflow, DelegateExecution execution) {
+		
+		List<WorkflowValidator> filtered = filterValidators(validators, workflow);
+		
+		List<Pair<String,Boolean>> results = new ArrayList<>();
+		filtered.forEach(item -> results.add(new Pair<>(item.getClass().getName(), item.validate(execution))));
+		
+		return results.stream().filter(item -> item.getValue1().equals(false)).collect(Collectors.toList());
+	}
+	
+	protected List<WorkflowValidator> filterValidators(List<? extends WorkflowValidator> validators, String workflow) {
+		return validators.stream()
+				.filter(item -> {
+					return item.forWorkflowAction().contains(workflow);
+				})
+				.sorted(Comparator.comparing(item -> {
+					Priority p = Optional.ofNullable(item.getClass().getAnnotation(Priority.class)).orElse(new Priority() {
+						public int value() {
+							return 1000;
+						}
+
+						@Override
+						public Class<? extends Annotation> annotationType() {
+							return Priority.class;
+						}
+					});
+					return p.value();
+				})).collect(Collectors.toList());
+	}
+	
+	protected <T> List<T> buildalidatorList(Reflections reflections, Class<T> clazz) {
+		List<T> result = new ArrayList<>();
+		try {
+			for (Class<? extends T> klass : reflections.getSubTypesOf(clazz)) {
+				result.add(klass.newInstance());
+			}
+		} catch (InstantiationException | IllegalAccessException e) {
+			logger.error("failed to build validator list for " + clazz.getName(), e);
+			throw new RuntimeException(e);
+		}
+		
+		return result;
+	}
+	
+	protected List<PreWorkflowValidator> getPreWorkflowValidators() {
+		return this.preWorkflowValidators;
+	}
+	
+	protected List<PostWorkflowValidator> getPostWorkflowValidators() {
+		return this.postWorkflowValidators;
+	}
+	
+}