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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2019-2020 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.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);
/**
* 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).getDeclaredConstructor().newInstance();
} catch (final Exception 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.getName() + "\"";
LOGGER.error(errorMessage);
throw new ApexEventException(errorMessage);
}
return (ApexEventConsumer) consumerPluginObject;
}
}
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