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.context.impl.distribution;
23 import java.util.Collections;
24 import java.util.HashMap;
26 import java.util.Map.Entry;
28 import org.onap.policy.apex.context.ContextAlbum;
29 import org.onap.policy.apex.context.ContextException;
30 import org.onap.policy.apex.context.Distributor;
31 import org.onap.policy.apex.context.LockManager;
32 import org.onap.policy.apex.context.Persistor;
33 import org.onap.policy.apex.context.impl.ContextAlbumImpl;
34 import org.onap.policy.apex.context.impl.locking.LockManagerFactory;
35 import org.onap.policy.apex.context.impl.persistence.PersistorFactory;
36 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
37 import org.onap.policy.apex.model.basicmodel.concepts.AxKeyInformation;
38 import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult;
39 import org.onap.policy.apex.model.basicmodel.service.ModelService;
40 import org.onap.policy.apex.model.contextmodel.concepts.AxContextAlbum;
41 import org.onap.policy.apex.model.contextmodel.concepts.AxContextAlbums;
42 import org.onap.policy.apex.model.contextmodel.concepts.AxContextModel;
43 import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchema;
44 import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchemas;
45 import org.slf4j.ext.XLogger;
46 import org.slf4j.ext.XLoggerFactory;
49 * This context distributor implements the mechanism-neutral parts of a context distributor.
51 * @author Liam Fallon (liam.fallon@ericsson.com)
53 public abstract class AbstractDistributor implements Distributor {
55 // Logger for this class
56 private static final XLogger LOGGER = XLoggerFactory.getXLogger(AbstractDistributor.class);
58 // The key of this distributor
59 private AxArtifactKey key = null;
61 // The context albums for this context set indexed by their keys
62 private static Map<AxArtifactKey, ContextAlbum> albumMaps = Collections
63 .synchronizedMap(new HashMap<AxArtifactKey, ContextAlbum>());
65 // Lock manager for this distributor
66 private static LockManager lockManager = null;
68 // Hold a persistor for this distributor
69 private Persistor persistor = null;
71 // Hold a flush timer for this context distributor
72 private static DistributorFlushTimerTask flushTimer = null;
75 * Create an instance of an abstract Context Distributor.
77 public AbstractDistributor() {
78 LOGGER.entry("AbstractContextDistributor()");
79 LOGGER.exit("AbstractContextDistributor()");
86 public void init(final AxArtifactKey distributorKey) throws ContextException {
87 LOGGER.entry("init(" + distributorKey + ")");
89 // Record parameters and key
90 this.key = distributorKey;
92 // Create the lock manager if it doesn't already exist
93 if (lockManager == null) {
94 setLockManager(new LockManagerFactory().createLockManager(key));
97 // Set up flushing on the context distributor if its not set up already
98 if (flushTimer == null) {
99 setFlushTimer(new DistributorFlushTimerTask(this));
102 // Create a new persistor for this key
103 persistor = new PersistorFactory().createPersistor(key);
104 LOGGER.exit("init(" + key + ")");
108 * Set the static lock manager.
110 * @param incomingLockManager the lock manager value
112 private static void setLockManager(final LockManager incomingLockManager) {
113 lockManager = incomingLockManager;
117 * Set the static flush timer.
119 * @param incomingFlushTimer the flush timer value
121 private static void setFlushTimer(final DistributorFlushTimerTask incomingFlushTimer) {
122 flushTimer = incomingFlushTimer;
129 public abstract void shutdown();
135 public AxArtifactKey getKey() {
140 * Create a context album using whatever underlying mechanism we are using for albums.
142 * @param contextAlbumKey The key of the album
143 * @return The album as a string-object map
145 public abstract Map<String, Object> getContextAlbumMap(AxArtifactKey contextAlbumKey);
151 public void registerModel(final AxContextModel contextModel) throws ContextException {
152 ModelService.registerModel(AxKeyInformation.class, contextModel.getKeyInformation());
153 ModelService.registerModel(AxContextSchemas.class, contextModel.getSchemas());
154 ModelService.registerModel(AxContextAlbums.class, contextModel.getAlbums());
161 public synchronized ContextAlbum createContextAlbum(final AxArtifactKey axContextAlbumKey) throws ContextException {
162 // Get the context album definition
163 final AxContextAlbum album = ModelService.getModel(AxContextAlbums.class).get(axContextAlbumKey);
165 final String resultString = "context album " + axContextAlbumKey.getId() + " does not exist";
166 LOGGER.warn(resultString);
167 throw new ContextException(resultString);
170 // Check if the context album is valid
171 final AxValidationResult result = album.validate(new AxValidationResult());
172 if (!result.isValid()) {
173 final String resultString = "context album definition for " + album.getKey().getId() + " is invalid"
175 LOGGER.warn(resultString);
176 throw new ContextException(resultString);
179 // Get the schema of the context album
180 final AxContextSchema schema = ModelService.getModel(AxContextSchemas.class).get(album.getItemSchema());
181 if (schema == null) {
182 final String resultString = "schema \"" + album.getItemSchema().getId() + "\" for context album "
183 + album.getKey().getId() + " does not exist";
184 LOGGER.warn(resultString);
185 throw new ContextException(resultString);
188 synchronized (albumMaps) {
189 // Check if the map has already been instantiated
190 if (!albumMaps.containsKey(album.getKey())) {
191 // Instantiate the album map for this context album that we'll distribute using the distribution
193 final Map<String, Object> newContextAlbumMap = getContextAlbumMap(album.getKey());
195 // The distributed context album will have content from another process instance if the album exists in
196 // another process, if not, we have to try to read the content from persistence
197 if (newContextAlbumMap.isEmpty()) {
198 // Read entries from persistence, (Not implemented yet)
201 // Create the context album and put the context album object onto the distributor
202 albumMaps.put(album.getKey(), new ContextAlbumImpl(album, this, newContextAlbumMap));
205 return albumMaps.get(album.getKey());
213 public void removeContextAlbum(final AxContextAlbum contextAlbum) throws ContextException {
214 synchronized (albumMaps) {
215 // Check if the map already exists, if not return
216 if (!albumMaps.containsKey(contextAlbum.getKey())) {
217 LOGGER.warn("map remove failed, supplied map is null");
218 throw new ContextException("map update failed, supplied map is null");
221 // Remove the map from the distributor
222 albumMaps.remove(contextAlbum.getKey());
230 public void flush() throws ContextException {
231 synchronized (albumMaps) {
232 // Flush all the maps
233 for (final Entry<AxArtifactKey, ContextAlbum> distributorMapEntry : albumMaps.entrySet()) {
234 // Let the persistor write each of the entries
235 for (final Object contextItem : distributorMapEntry.getValue().values()) {
236 persistor.writeContextItem(contextItem);
246 public void flushContextAlbum(final ContextAlbum contextAlbum) throws ContextException {
247 synchronized (albumMaps) {
248 // Check if the map already exists, if not return
249 if (!albumMaps.containsKey(contextAlbum.getKey())) {
250 LOGGER.warn("map flush failed, supplied map is null");
251 throw new ContextException("map flush failed, supplied map is null");
254 // Let the persistor flush the items on the map
255 for (final Object contextItem : albumMaps.get(contextAlbum.getKey()).values()) {
256 persistor.writeContextItem(contextItem);
265 public synchronized void lockForReading(final AxArtifactKey mapKey, final String itemKey) throws ContextException {
266 // Lock using the lock manager
267 lockManager.lockForReading(mapKey.getId(), itemKey);
274 public synchronized void lockForWriting(final AxArtifactKey mapKey, final String itemKey) throws ContextException {
275 // Lock using the lock manager
276 lockManager.lockForWriting(mapKey.getId(), itemKey);
283 public void unlockForReading(final AxArtifactKey mapKey, final String itemKey) throws ContextException {
284 // Unlock using the lock manager
285 lockManager.unlockForReading(mapKey.getId(), itemKey);
292 public void unlockForWriting(final AxArtifactKey mapKey, final String itemKey) throws ContextException {
293 // Unlock using the lock manager
294 lockManager.unlockForWriting(mapKey.getId(), itemKey);
301 public void clear() {
302 // Shut down the lock manager
303 if (lockManager != null) {
304 lockManager.shutdown();
305 setLockManager(null);
308 synchronized (albumMaps) {
312 // Turn off the flush timer
315 // Shut down the specialization of the context distributor