diff options
Diffstat (limited to 'services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventProtocolFactory.java')
-rw-r--r-- | services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventProtocolFactory.java | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventProtocolFactory.java b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventProtocolFactory.java new file mode 100644 index 000000000..85c5bf03f --- /dev/null +++ b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/event/impl/EventProtocolFactory.java @@ -0,0 +1,76 @@ +/*- + * ============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.ApexEventProtocolConverter; +import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException; +import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolParameters; +import org.slf4j.ext.XLogger; +import org.slf4j.ext.XLoggerFactory; + +/** + * This factory class uses the Apex event protocol parameters to create and return an instance of + * the correct Apex event protocol converter plugin for the specified event protocol. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + */ +public class EventProtocolFactory { + // The logger for this class + private static final XLogger LOGGER = XLoggerFactory.getXLogger(EventProtocolFactory.class); + + /** + * Create an event converter that converts between an + * {@link org.onap.policy.apex.service.engine.event.ApexEvent} and the specified event protocol. + * + * @param name the name of the event protocol + * @param eventProtocolParameters the event protocol parameters defining what to convert from + * and to + * @return The event converter for converting events to and from Apex format + */ + public ApexEventProtocolConverter createConverter(final String name, + final EventProtocolParameters eventProtocolParameters) { + // Get the class for the event protocol plugin using reflection + final String eventProtocolPluginClass = eventProtocolParameters.getEventProtocolPluginClass(); + Object eventProtocolPluginObject = null; + try { + eventProtocolPluginObject = Class.forName(eventProtocolPluginClass).newInstance(); + } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) { + final String errorMessage = "could not create an Apex event protocol converter for \"" + name + + "\" for the protocol \"" + eventProtocolParameters.getLabel() + + "\", specified event protocol converter plugin class \"" + eventProtocolPluginClass + + "\" not found"; + LOGGER.error(errorMessage, e); + throw new ApexEventRuntimeException(errorMessage, e); + } + + // Check the class is an event consumer + if (!(eventProtocolPluginObject instanceof ApexEventProtocolConverter)) { + final String errorMessage = "could not create an Apex event protocol converter for \"" + name + + "\" for the protocol \"" + eventProtocolParameters.getLabel() + + "\", specified event protocol converter plugin class \"" + eventProtocolPluginClass + + "\" is not an instance of \"" + ApexEventProtocolConverter.class.getCanonicalName() + "\""; + LOGGER.error(errorMessage); + throw new ApexEventRuntimeException(errorMessage); + } + ((ApexEventProtocolConverter) eventProtocolPluginObject).init(eventProtocolParameters); + return (ApexEventProtocolConverter) eventProtocolPluginObject; + } +} |