1 files changed, 179 insertions, 0 deletions
diff --git a/controlloop/common/eventmanager/src/main/java/org/onap/policy/controlloop/eventmanager/EventManagerServices.java b/controlloop/common/eventmanager/src/main/java/org/onap/policy/controlloop/eventmanager/EventManagerServices.java
new file mode 100644
index 000000000..d8668e47d
--- /dev/null
+++ b/controlloop/common/eventmanager/src/main/java/org/onap/policy/controlloop/eventmanager/EventManagerServices.java
@@ -0,0 +1,179 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2020 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.policy.controlloop.eventmanager;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Map;
+import java.util.Properties;
+import lombok.Getter;
+import org.onap.policy.common.parameters.ValidationResult;
+import org.onap.policy.common.utils.resources.ResourceUtils;
+import org.onap.policy.controlloop.actor.guard.GuardActorServiceProvider;
+import org.onap.policy.controlloop.actor.guard.GuardConfig;
+import org.onap.policy.controlloop.actor.guard.GuardOperation;
+import org.onap.policy.controlloop.actor.guard.GuardOperator;
+import org.onap.policy.controlloop.actorserviceprovider.ActorService;
+import org.onap.policy.controlloop.actorserviceprovider.Util;
+import org.onap.policy.controlloop.ophistory.OperationHistoryDataManager;
+import org.onap.policy.controlloop.ophistory.OperationHistoryDataManagerImpl;
+import org.onap.policy.controlloop.ophistory.OperationHistoryDataManagerParams;
+import org.onap.policy.controlloop.ophistory.OperationHistoryDataManagerStub;
+import org.onap.policy.controlloop.utils.ControlLoopUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Services used by the ControlLoopEventManager.
+ */
+@Getter
+public class EventManagerServices {
+    public static final Logger logger = LoggerFactory.getLogger(EventManagerServices.class);
+    public static final String ACTOR_SERVICE_PROPERTIES = "actor.service";
+    public static final String DATA_MANAGER_PROPERTIES = "operation.history";
+
+    public final ActorService actorService = new ActorService();
+
+    // assume we're using a stub until proven otherwise
+    public final OperationHistoryDataManager dataManager;
+
+    /**
+     * Constructs the object. Configures and starts the actor service. Initializes
+     * {@link #dataManager}, to a "real" data manager, if guards are enabled.
+     *
+     * @param configFileName configuration file name
+     */
+    public EventManagerServices(String configFileName) {
+        // configure and start actor services
+        Properties props = startActorService(configFileName);
+
+        if (isGuardEnabled()) {
+            // guards are enabled - use a real data manager
+            dataManager = makeDataManager(props);
+        } else {
+            // guards are disabled - use a stub data manager
+            dataManager = new OperationHistoryDataManagerStub();
+        }
+    }
+
+    /**
+     * Configures and starts the actor service.
+     *
+     * @param configFileName configuration file name
+     * @return the properties that were loaded from the configuration file
+     */
+    public Properties startActorService(String configFileName) {
+        try (InputStream inpstr = openConfigFile(configFileName)) {
+            Properties props = new Properties();
+            props.load(inpstr);
+
+            Map<String, Object> parameters = ControlLoopUtils.toObject(props, ACTOR_SERVICE_PROPERTIES);
+            ControlLoopUtils.compressLists(parameters);
+
+            actorService.configure(parameters);
+            actorService.start();
+
+            return props;
+
+        } catch (RuntimeException | IOException e) {
+            logger.error("cannot configure/start actor service");
+            throw new IllegalStateException(e);
+        }
+    }
+
+    /**
+     * Opens the config file.
+     *
+     * @param configFileName configuration file name
+     * @return the file's input stream
+     * @throws FileNotFoundException if the file cannot be found
+     */
+    private InputStream openConfigFile(String configFileName) throws FileNotFoundException {
+        InputStream inpstr = ResourceUtils.getResourceAsStream(configFileName);
+        if (inpstr == null) {
+            throw new FileNotFoundException(configFileName);
+        }
+
+        return inpstr;
+    }
+
+    /**
+     * Determines if guards are enabled.
+     *
+     * @return {@code true} if guards are enabled, {@code false} otherwise
+     */
+    public boolean isGuardEnabled() {
+        try {
+            GuardOperator guard = (GuardOperator) getActorService().getActor(GuardActorServiceProvider.NAME)
+                            .getOperator(GuardOperation.NAME);
+            if (!guard.isConfigured()) {
+                logger.warn("cannot check 'disabled' property in GUARD actor - assuming disabled");
+                return false;
+            }
+
+            GuardConfig config = (GuardConfig) guard.getCurrentConfig();
+            if (config.isDisabled()) {
+                logger.warn("guard disabled");
+                return false;
+            }
+
+            if (!guard.isAlive()) {
+                logger.warn("guard actor is not running");
+                return false;
+            }
+
+            return true;
+
+        } catch (RuntimeException e) {
+            logger.warn("cannot check 'disabled' property in GUARD actor - assuming disabled", e);
+            return false;
+        }
+    }
+
+    /**
+     * Makes and starts the data manager.
+     *
+     * @param props properties with which to configure the data manager
+     * @return a new data manager
+     */
+    public OperationHistoryDataManagerImpl makeDataManager(Properties props) {
+        try {
+            Map<String, Object> parameters = ControlLoopUtils.toObject(props, DATA_MANAGER_PROPERTIES);
+            OperationHistoryDataManagerParams params = Util.translate(DATA_MANAGER_PROPERTIES, parameters,
+                            OperationHistoryDataManagerParams.class);
+            ValidationResult result = params.validate(DATA_MANAGER_PROPERTIES);
+            if (!result.isValid()) {
+                throw new IllegalArgumentException("invalid data manager properties:\n" + result.getResult());
+            }
+
+            OperationHistoryDataManagerImpl mgr = new OperationHistoryDataManagerImpl(params);
+            mgr.start();
+
+            return mgr;
+
+        } catch (RuntimeException e) {
+            logger.error("cannot start operation history data manager");
+            actorService.stop();
+            throw e;
+        }
+    }
+}