2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
5 * ================================================================================
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * SPDX-License-Identifier: Apache-2.0
19 * ============LICENSE_END=========================================================
22 package org.onap.policy.apex.plugins.context.distribution.hazelcast;
24 import com.hazelcast.core.Hazelcast;
25 import com.hazelcast.core.HazelcastInstance;
27 import lombok.AccessLevel;
29 import org.onap.policy.apex.context.ContextException;
30 import org.onap.policy.apex.context.impl.distribution.AbstractDistributor;
31 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
32 import org.slf4j.ext.XLogger;
33 import org.slf4j.ext.XLoggerFactory;
36 * This context distributor distributes context across threads in multiple JVMs on multiple hosts.
37 * It uses hazelcast to distribute maps.
39 * @author Liam Fallon (liam.fallon@ericsson.com)
41 public class HazelcastContextDistributor extends AbstractDistributor {
42 // Logger for this class
43 private static final XLogger LOGGER = XLoggerFactory.getXLogger(HazelcastContextDistributor.class);
45 // The hazelcast instance for distributing context for this JVM
46 @Setter(AccessLevel.PRIVATE)
47 private static HazelcastInstance hazelcastInstance = null;
50 * Create an instance of a Hazelcast Context Distributor.
52 * @throws ContextException On errors creating the context distributor
54 public HazelcastContextDistributor() throws ContextException {
56 LOGGER.entry("HazelcastContextDistributor()");
58 LOGGER.exit("HazelcastContextDistributor()");
65 public void init(final AxArtifactKey key) throws ContextException {
66 LOGGER.entry("init(" + key + ")");
70 // Create the hazelcast instance if it does not already exist
71 if (hazelcastInstance == null) {
72 setHazelcastInstance(Hazelcast.newHazelcastInstance());
75 LOGGER.exit("init(" + key + ")");
82 public Map<String, Object> getContextAlbumMap(final AxArtifactKey contextAlbumKey) {
83 // Get the map from Hazelcast
84 LOGGER.info("HazelcastContextDistributor: create album: " + contextAlbumKey.getId());
85 return hazelcastInstance.getMap(contextAlbumKey.getId());
92 public void shutdown() {
93 // Shut down the hazelcast instance
94 if (hazelcastInstance != null) {
95 hazelcastInstance.shutdown();
97 setHazelcastInstance(null);