2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.apex.plugins.context.distribution.hazelcast;
23 import com.hazelcast.core.Hazelcast;
24 import com.hazelcast.core.HazelcastInstance;
28 import org.onap.policy.apex.context.ContextException;
29 import org.onap.policy.apex.context.impl.distribution.AbstractDistributor;
30 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
31 import org.slf4j.ext.XLogger;
32 import org.slf4j.ext.XLoggerFactory;
35 * This context distributor distributes context across threads in multiple JVMs on multiple hosts.
36 * It uses hazelcast to distribute maps.
38 * @author Liam Fallon (liam.fallon@ericsson.com)
40 public class HazelcastContextDistributor extends AbstractDistributor {
41 // Logger for this class
42 private static final XLogger LOGGER = XLoggerFactory.getXLogger(HazelcastContextDistributor.class);
44 // The hazelcast instance for distributing context for this JVM
45 private static HazelcastInstance hazelcastInstance = null;
48 * Create an instance of a Hazelcast Context Distributor.
50 * @throws ContextException On errors creating the context distributor
52 public HazelcastContextDistributor() throws ContextException {
54 LOGGER.entry("HazelcastContextDistributor()");
56 LOGGER.exit("HazelcastContextDistributor()");
63 public void init(final AxArtifactKey key) throws ContextException {
64 LOGGER.entry("init(" + key + ")");
68 // Create the hazelcast instance if it does not already exist
69 if (hazelcastInstance == null) {
70 setHazelcastInstance(Hazelcast.newHazelcastInstance());
73 LOGGER.exit("init(" + key + ")");
77 * Set the hazelcast instance statically.
78 * @param newHazelcastInstance the hazelcast instance
80 private static void setHazelcastInstance(HazelcastInstance newHazelcastInstance) {
81 hazelcastInstance = newHazelcastInstance;
88 public Map<String, Object> getContextAlbumMap(final AxArtifactKey contextAlbumKey) {
89 // Get the map from Hazelcast
90 LOGGER.info("HazelcastContextDistributor: create album: " + contextAlbumKey.getId());
91 return hazelcastInstance.getMap(contextAlbumKey.getId());
98 public void shutdown() {
99 // Shut down the hazelcast instance
100 if (hazelcastInstance != null) {
101 hazelcastInstance.shutdown();
103 setHazelcastInstance(null);