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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2019 Nordix Foundation.
* ================================================================================
* 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.getName() + "\"";
LOGGER.error(errorMessage);
throw new ApexEventRuntimeException(errorMessage);
}
((ApexEventProtocolConverter) eventProtocolPluginObject).init(eventProtocolParameters);
return (ApexEventProtocolConverter) eventProtocolPluginObject;
}
}
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