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/*-
* ============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.plugins.context.distribution.hazelcast;
import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;
import java.util.Map;
import org.onap.policy.apex.context.ContextException;
import org.onap.policy.apex.context.impl.distribution.AbstractDistributor;
import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
import org.slf4j.ext.XLogger;
import org.slf4j.ext.XLoggerFactory;
/**
* This context distributor distributes context across threads in multiple JVMs on multiple hosts.
* It uses hazelcast to distribute maps.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class HazelcastContextDistributor extends AbstractDistributor {
// Logger for this class
private static final XLogger LOGGER = XLoggerFactory.getXLogger(HazelcastContextDistributor.class);
// The hazelcast instance for distributing context for this JVM
private static HazelcastInstance hazelcastInstance = null;
/**
* Create an instance of a Hazelcast Context Distributor.
*
* @throws ContextException On errors creating the context distributor
*/
public HazelcastContextDistributor() throws ContextException {
super();
LOGGER.entry("HazelcastContextDistributor()");
LOGGER.exit("HazelcastContextDistributor()");
}
/**
* {@inheritDoc}.
*/
@Override
public void init(final AxArtifactKey key) throws ContextException {
LOGGER.entry("init(" + key + ")");
super.init(key);
// Create the hazelcast instance if it does not already exist
if (hazelcastInstance == null) {
setHazelcastInstance(Hazelcast.newHazelcastInstance());
}
LOGGER.exit("init(" + key + ")");
}
/**
* Set the hazelcast instance statically.
* @param newHazelcastInstance the hazelcast instance
*/
private static void setHazelcastInstance(HazelcastInstance newHazelcastInstance) {
hazelcastInstance = newHazelcastInstance;
}
/**
* {@inheritDoc}.
*/
@Override
public Map<String, Object> getContextAlbumMap(final AxArtifactKey contextAlbumKey) {
// Get the map from Hazelcast
LOGGER.info("HazelcastContextDistributor: create album: " + contextAlbumKey.getId());
return hazelcastInstance.getMap(contextAlbumKey.getId());
}
/**
* {@inheritDoc}.
*/
@Override
public void shutdown() {
// Shut down the hazelcast instance
if (hazelcastInstance != null) {
hazelcastInstance.shutdown();
}
setHazelcastInstance(null);
}
}
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