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Diffstat (limited to 'services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventConsumerFactory.java')
-rw-r--r-- | services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventConsumerFactory.java | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventConsumerFactory.java b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventConsumerFactory.java new file mode 100644 index 000000000..8f54c049b --- /dev/null +++ b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventConsumerFactory.java @@ -0,0 +1,83 @@ +/*- + * ============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; + } +} |