diff options
Diffstat (limited to 'services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventProducerFactory.java')
-rw-r--r-- | services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventProducerFactory.java | 82 |
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 new file mode 100644 index 000000000..9bbbad362 --- /dev/null +++ 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; + } +} |