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 =
63 Collections.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()");
85 * @see org.onap.policy.apex.context.ContextDistributor#init(org.onap.policy.apex.model.basicmodel.concepts.
89 public void init(final AxArtifactKey distributorKey) throws ContextException {
90 LOGGER.entry("init(" + distributorKey + ")");
92 // Record parameters and key
93 this.key = distributorKey;
95 // Create the lock manager if it doesn't already exist
96 if (lockManager == null) {
97 setLockManager(new LockManagerFactory().createLockManager(key));
100 // Set up flushing on the context distributor if its not set up already
101 if (flushTimer == null) {
102 setFlushTimer(new DistributorFlushTimerTask(this));
105 // Create a new persistor for this key
106 persistor = new PersistorFactory().createPersistor(key);
107 LOGGER.exit("init(" + key + ")");
111 * Set the static lock manager
112 * @param incomingLockManager the lock manager value
114 private static void setLockManager(final LockManager incomingLockManager) {
115 lockManager = incomingLockManager;
119 * Set the static flush timer
120 * @param incomingFlushTimer the flush timer value
122 private static void setFlushTimer(final DistributorFlushTimerTask incomingFlushTimer) {
123 flushTimer = incomingFlushTimer;
129 * @see org.onap.policy.apex.context.ContextDistributor#shutdown()
132 public abstract void shutdown();
137 * @see org.onap.policy.apex.context.ContextDistributor#getKey()
140 public AxArtifactKey getKey() {
145 * Create a context album using whatever underlying mechanism we are using for albums.
147 * @param contextAlbumKey The key of the album
148 * @return The album as a string-object map
150 public abstract Map<String, Object> getContextAlbumMap(AxArtifactKey contextAlbumKey);
156 * @see org.onap.policy.apex.context.Distributor#registerModel(org.onap.policy.apex.model.contextmodel.concepts.
160 public void registerModel(final AxContextModel contextModel) throws ContextException {
161 ModelService.registerModel(AxKeyInformation.class, contextModel.getKeyInformation());
162 ModelService.registerModel(AxContextSchemas.class, contextModel.getSchemas());
163 ModelService.registerModel(AxContextAlbums.class, contextModel.getAlbums());
170 * org.onap.policy.apex.core.context.ContextDistributor#createContextAlbum(org.onap.policy.apex.core.basicmodel.
171 * concepts. AxArtifactKey)
174 public synchronized ContextAlbum createContextAlbum(final AxArtifactKey axContextAlbumKey) throws ContextException {
175 // Get the context album definition
176 final AxContextAlbum album = ModelService.getModel(AxContextAlbums.class).get(axContextAlbumKey);
178 final String resultString = "context album " + axContextAlbumKey.getId() + " does not exist";
179 LOGGER.warn(resultString);
180 throw new ContextException(resultString);
183 // Check if the context album is valid
184 final AxValidationResult result = album.validate(new AxValidationResult());
185 if (!result.isValid()) {
186 final String resultString =
187 "context album definition for " + album.getKey().getId() + " is invalid" + result;
188 LOGGER.warn(resultString);
189 throw new ContextException(resultString);
192 // Get the schema of the context album
193 final AxContextSchema schema = ModelService.getModel(AxContextSchemas.class).get(album.getItemSchema());
194 if (schema == null) {
195 final String resultString = "schema \"" + album.getItemSchema().getId() + "\" for context album "
196 + album.getKey().getId() + " does not exist";
197 LOGGER.warn(resultString);
198 throw new ContextException(resultString);
201 // Check if the map has already been instantiated
202 if (!albumMaps.containsKey(album.getKey())) {
203 // Instantiate the album map for this context album that we'll distribute using the distribution mechanism
204 final Map<String, Object> newContextAlbumMap = getContextAlbumMap(album.getKey());
206 // The distributed context album will have content from another process instance if the album exists in
208 // if not, we have to try to read the content from persistence
209 if (newContextAlbumMap.isEmpty()) {
210 // Read entries from persistence, (Not implemented yet)
213 // Create the context album and put the context album object onto the distributor
214 albumMaps.put(album.getKey(), new ContextAlbumImpl(album, this, newContextAlbumMap));
217 return albumMaps.get(album.getKey());
224 * org.onap.policy.apex.core.context.ContextDistributor#removeContextAlbum(org.onap.policy.apex.core.basicmodel.
225 * concepts. AxArtifactKey)
228 public void removeContextAlbum(final AxContextAlbum contextAlbum) throws ContextException {
229 // Check if the map already exists, if not return
230 if (!albumMaps.containsKey(contextAlbum.getKey())) {
231 LOGGER.warn("map remove failed, supplied map is null");
232 throw new ContextException("map update failed, supplied map is null");
235 // Remove the map from the distributor
236 albumMaps.remove(contextAlbum.getKey());
242 * @see org.onap.policy.apex.core.context.ContextDistributor#flush()
245 public void flush() throws ContextException {
246 // Flush all the maps
247 for (final Entry<AxArtifactKey, ContextAlbum> distributorMapEntry : albumMaps.entrySet()) {
248 // Let the persistor write each of the entries
249 for (final Object contextItem : distributorMapEntry.getValue().values()) {
250 persistor.writeContextItem((AxContextSchema) contextItem);
258 * @see org.onap.policy.apex.core.context.ContextDistributor#flushContextAlbum(org.onap.policy.apex.core.context.
262 public void flushContextAlbum(final ContextAlbum contextAlbum) throws ContextException {
263 // Check if the map already exists, if not return
264 if (!albumMaps.containsKey(contextAlbum.getKey())) {
265 LOGGER.warn("map flush failed, supplied map is null");
266 throw new ContextException("map flush failed, supplied map is null");
269 // Let the persistor flush the items on the map
270 for (final Object contextItem : albumMaps.get(contextAlbum.getKey()).values()) {
271 persistor.writeContextItem(contextItem);
278 * @see org.onap.policy.apex.core.context.ContextDistributor#lockForReading(java.lang.String)
281 public synchronized void lockForReading(final AxArtifactKey mapKey, final String itemKey) throws ContextException {
282 // Lock using the lock manager
283 lockManager.lockForReading(mapKey.getId(), itemKey);
289 * @see org.onap.policy.apex.core.context.ContextDistributor#lockForWriting(java.lang.String)
292 public synchronized void lockForWriting(final AxArtifactKey mapKey, final String itemKey) throws ContextException {
293 // Lock using the lock manager
294 lockManager.lockForWriting(mapKey.getId(), itemKey);
300 * @see org.onap.policy.apex.core.context.ContextDistributor#unlockForReading(java.lang.String)
303 public void unlockForReading(final AxArtifactKey mapKey, final String itemKey) throws ContextException {
304 // Unlock using the lock manager
305 lockManager.unlockForReading(mapKey.getId(), itemKey);
311 * @see org.onap.policy.apex.core.context.ContextDistributor#unlockForWriting(java.lang.String)
314 public void unlockForWriting(final AxArtifactKey mapKey, final String itemKey) throws ContextException {
315 // Unlock using the lock manager
316 lockManager.unlockForWriting(mapKey.getId(), itemKey);
322 * @see org.onap.policy.apex.core.context.ContextDistributor#clear()
325 public void clear() {
326 // Shut down the lock manager
327 if (lockManager != null) {
328 lockManager.shutdown();
329 setLockManager(null);
334 // Turn off the flush timer
337 // Shut down the specialization of the context distributor