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 lockManager = new LockManagerFactory().createLockManager(key);
100 // Set up flushing on the context distributor if its not set up already
101 if (flushTimer == null) {
102 flushTimer = new DistributorFlushTimerTask(this);
105 // Create a new persistor for this key
106 persistor = new PersistorFactory().createPersistor(key);
107 LOGGER.exit("init(" + key + ")");
113 * @see org.onap.policy.apex.context.ContextDistributor#shutdown()
116 public abstract void shutdown();
121 * @see org.onap.policy.apex.context.ContextDistributor#getKey()
124 public AxArtifactKey getKey() {
129 * Create a context album using whatever underlying mechanism we are using for albums.
131 * @param contextAlbumKey The key of the album
132 * @return The album as a string-object map
134 public abstract Map<String, Object> getContextAlbumMap(AxArtifactKey contextAlbumKey);
140 * @see org.onap.policy.apex.context.Distributor#registerModel(org.onap.policy.apex.model.contextmodel.concepts.
144 public void registerModel(final AxContextModel contextModel) throws ContextException {
145 ModelService.registerModel(AxKeyInformation.class, contextModel.getKeyInformation());
146 ModelService.registerModel(AxContextSchemas.class, contextModel.getSchemas());
147 ModelService.registerModel(AxContextAlbums.class, contextModel.getAlbums());
154 * org.onap.policy.apex.core.context.ContextDistributor#createContextAlbum(org.onap.policy.apex.core.basicmodel.
155 * concepts. AxArtifactKey)
158 public synchronized ContextAlbum createContextAlbum(final AxArtifactKey axContextAlbumKey) throws ContextException {
159 // Get the context album definition
160 final AxContextAlbum album = ModelService.getModel(AxContextAlbums.class).get(axContextAlbumKey);
162 final String resultString = "context album " + axContextAlbumKey.getId() + " does not exist";
163 LOGGER.warn(resultString);
164 throw new ContextException(resultString);
167 // Check if the context album is valid
168 final AxValidationResult result = album.validate(new AxValidationResult());
169 if (!result.isValid()) {
170 final String resultString =
171 "context album definition for " + album.getKey().getId() + " is invalid" + result;
172 LOGGER.warn(resultString);
173 throw new ContextException(resultString);
176 // Get the schema of the context album
177 final AxContextSchema schema = ModelService.getModel(AxContextSchemas.class).get(album.getItemSchema());
178 if (schema == null) {
179 final String resultString = "schema \"" + album.getItemSchema().getId() + "\" for context album "
180 + album.getKey().getId() + " does not exist";
181 LOGGER.warn(resultString);
182 throw new ContextException(resultString);
185 // Check if the map has already been instantiated
186 if (!albumMaps.containsKey(album.getKey())) {
187 // Instantiate the album map for this context album that we'll distribute using the distribution mechanism
188 final Map<String, Object> newContextAlbumMap = getContextAlbumMap(album.getKey());
190 // The distributed context album will have content from another process instance if the album exists in
192 // if not, we have to try to read the content from persistence
193 if (newContextAlbumMap.isEmpty()) {
194 // Read entries from persistence
195 // TODO: READ ITEMS FROM PRESISTENCE!!!!
198 // Create the context album and put the context album object onto the distributor
199 albumMaps.put(album.getKey(), new ContextAlbumImpl(album, this, newContextAlbumMap));
202 return albumMaps.get(album.getKey());
209 * org.onap.policy.apex.core.context.ContextDistributor#removeContextAlbum(org.onap.policy.apex.core.basicmodel.
210 * concepts. AxArtifactKey)
213 public void removeContextAlbum(final AxContextAlbum contextAlbum) throws ContextException {
214 // Check if the map already exists, if not return
215 if (!albumMaps.containsKey(contextAlbum.getKey())) {
216 LOGGER.warn("map remove failed, supplied map is null");
217 throw new ContextException("map update failed, supplied map is null");
220 // Remove the map from the distributor
221 albumMaps.remove(contextAlbum.getKey());
227 * @see org.onap.policy.apex.core.context.ContextDistributor#flush()
230 public void flush() throws ContextException {
231 // Flush all the maps
232 for (final Entry<AxArtifactKey, ContextAlbum> distributorMapEntry : albumMaps.entrySet()) {
233 // Let the persistor write each of the entries
234 for (final Object contextItem : distributorMapEntry.getValue().values()) {
235 LOGGER.debug(contextItem.toString());
236 // persistor.writeContextItem((AxContextSchema) contextItem);
244 * @see org.onap.policy.apex.core.context.ContextDistributor#flushContextAlbum(org.onap.policy.apex.core.context.
248 public void flushContextAlbum(final ContextAlbum contextAlbum) throws ContextException {
249 // Check if the map already exists, if not return
250 if (!albumMaps.containsKey(contextAlbum.getKey())) {
251 LOGGER.warn("map flush failed, supplied map is null");
252 throw new ContextException("map flush failed, supplied map is null");
255 // Let the persistor flush the items on the map
256 for (final Object contextItem : albumMaps.get(contextAlbum.getKey()).values()) {
257 persistor.writeContextItem(contextItem);
264 * @see org.onap.policy.apex.core.context.ContextDistributor#lockForReading(java.lang.String)
267 public synchronized void lockForReading(final AxArtifactKey mapKey, final String itemKey) throws ContextException {
268 // Lock using the lock manager
269 lockManager.lockForReading(mapKey.getId(), itemKey);
275 * @see org.onap.policy.apex.core.context.ContextDistributor#lockForWriting(java.lang.String)
278 public synchronized void lockForWriting(final AxArtifactKey mapKey, final String itemKey) throws ContextException {
279 // Lock using the lock manager
280 lockManager.lockForWriting(mapKey.getId(), itemKey);
286 * @see org.onap.policy.apex.core.context.ContextDistributor#unlockForReading(java.lang.String)
289 public void unlockForReading(final AxArtifactKey mapKey, final String itemKey) throws ContextException {
290 // Unlock using the lock manager
291 lockManager.unlockForReading(mapKey.getId(), itemKey);
297 * @see org.onap.policy.apex.core.context.ContextDistributor#unlockForWriting(java.lang.String)
300 public void unlockForWriting(final AxArtifactKey mapKey, final String itemKey) throws ContextException {
301 // Unlock using the lock manager
302 lockManager.unlockForWriting(mapKey.getId(), itemKey);
308 * @see org.onap.policy.apex.core.context.ContextDistributor#clear()
311 public void clear() {
312 // Shut down the lock manager
313 if (lockManager != null) {
314 lockManager.shutdown();
320 // Turn off the flush timer
323 // Shut down the specialization of the context distributor