1 files changed, 82 insertions, 0 deletions
diff --git a/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventProducerFactory.java b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventProducerFactory.java
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+++ b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventProducerFactory.java
@@ -0,0 +1,82 @@
+/*-
+ * ============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.service.engine.event.impl;
+
+import org.onap.policy.apex.service.engine.event.ApexEventException;
+import org.onap.policy.apex.service.engine.event.ApexEventProducer;
+import org.onap.policy.apex.service.parameters.carriertechnology.CarrierTechnologyParameters;
+import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
+import org.slf4j.ext.XLogger;
+import org.slf4j.ext.XLoggerFactory;
+
+/**
+ * This factory class creates event producers for the defined technology type for Apex engines.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class EventProducerFactory {
+    // The logger for this class
+    private static final XLogger LOGGER = XLoggerFactory.getXLogger(EventProducerFactory.class);
+
+    /**
+     * Empty constructor with no generic overloading.
+     */
+    public EventProducerFactory() {}
+
+    /**
+     * Create an event producer of the required type for the specified producer technology.
+     *
+     * @param name the name of the producer
+     * @param producerParameters The Apex parameters containing the configuration for the producer
+     * @return the event producer
+     * @throws ApexEventException on errors creating the Apex event producer
+     */
+    public ApexEventProducer createProducer(final String name, final EventHandlerParameters producerParameters)
+            throws ApexEventException {
+        // Get the carrier technology parameters
+        final CarrierTechnologyParameters technologyParameters = producerParameters.getCarrierTechnologyParameters();
+
+        // Get the class for the event producer using reflection
+        final String producerPluginClass = technologyParameters.getEventProducerPluginClass();
+        Object producerPluginObject = null;
+        try {
+            producerPluginObject = Class.forName(producerPluginClass).newInstance();
+        } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
+            final String errorMessage = "could not create an Apex event producer for Producer \"" + name
+                    + "\" for the carrier technology \"" + technologyParameters.getLabel()
+                    + "\", specified event producer plugin class \"" + producerPluginClass + "\" not found";
+            LOGGER.error(errorMessage, e);
+            throw new ApexEventException(errorMessage, e);
+        }
+
+        // Check the class is an event producer
+        if (!(producerPluginObject instanceof ApexEventProducer)) {
+            final String errorMessage = "could not create an Apex event producer for Producer \"" + name
+                    + "\" for the carrier technology \"" + technologyParameters.getLabel()
+                    + "\", specified event producer plugin class \"" + producerPluginClass
+                    + "\" is not an instance of \"" + ApexEventProducer.class.getCanonicalName() + "\"";
+            LOGGER.error(errorMessage);
+            throw new ApexEventException(errorMessage);
+        }
+
+        return (ApexEventProducer) producerPluginObject;
+    }
+}