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+/*-
+ * ============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.ApexEventConsumer;
+import org.onap.policy.apex.service.engine.event.ApexEventException;
+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 consumers of various technology types for Apex engines.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class EventConsumerFactory {
+ // The logger for this class
+ private static final XLogger LOGGER = XLoggerFactory.getXLogger(EventConsumerFactory.class);
+
+ /**
+ * Empty constructor with no generic overloading.
+ */
+ public EventConsumerFactory() {}
+
+ /**
+ * Create an event consumer of the required type for the specified consumer technology.
+ *
+ * @param name the name of the consumer
+ * @param consumerParameters The parameters for the Apex engine, we use the technology type of
+ * the required consumer
+ * @return the event consumer
+ * @throws ApexEventException on errors creating the Apex event consumer
+ */
+ public ApexEventConsumer createConsumer(final String name, final EventHandlerParameters consumerParameters)
+ throws ApexEventException {
+ // Get the carrier technology parameters
+ final CarrierTechnologyParameters technologyParameters = consumerParameters.getCarrierTechnologyParameters();
+
+ // Get the class for the event consumer using reflection
+ final String consumerPluginClass = technologyParameters.getEventConsumerPluginClass();
+ Object consumerPluginObject = null;
+ try {
+ consumerPluginObject = Class.forName(consumerPluginClass).newInstance();
+ } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
+ final String errorMessage = "could not create an Apex event consumer for \"" + name
+ + "\" for the carrier technology \"" + technologyParameters.getLabel()
+ + "\", specified event consumer plugin class \"" + consumerPluginClass + "\" not found";
+ LOGGER.error(errorMessage, e);
+ throw new ApexEventException(errorMessage, e);
+ }
+
+ // Check the class is an event consumer
+ if (!(consumerPluginObject instanceof ApexEventConsumer)) {
+ final String errorMessage = "could not create an Apex event consumer \"" + name
+ + "\" for the carrier technology \"" + technologyParameters.getLabel()
+ + "\", specified event consumer plugin class \"" + consumerPluginClass
+ + "\" is not an instance of \"" + ApexEventConsumer.class.getCanonicalName() + "\"";
+ LOGGER.error(errorMessage);
+ throw new ApexEventException(errorMessage);
+ }
+
+ return (ApexEventConsumer) consumerPluginObject;
+ }
+}