Source Code Cross Referenced for GlobalTxEntityMap.java in  » EJB-Server-JBoss-4.2.1 » server » org » jboss » ejb » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » server » org.jboss.ejb 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JBoss, Home of Professional Open Source.
003:         * Copyright 2006, Red Hat Middleware LLC, and individual contributors
004:         * as indicated by the @author tags. See the copyright.txt file in the
005:         * distribution for a full listing of individual contributors.
006:         *
007:         * This is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU Lesser General Public License as
009:         * published by the Free Software Foundation; either version 2.1 of
010:         * the License, or (at your option) any later version.
011:         *
012:         * This software is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this software; if not, write to the Free
019:         * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021:         */
022:        package org.jboss.ejb;
023:
024:        import org.jboss.logging.Logger;
025:        import org.jboss.tm.TransactionLocal;
026:
027:        import javax.ejb.EJBException;
028:        import javax.transaction.RollbackException;
029:        import javax.transaction.Status;
030:        import javax.transaction.Synchronization;
031:        import javax.transaction.SystemException;
032:        import javax.transaction.Transaction;
033:        import java.util.ArrayList;
034:        import java.util.List;
035:
036:        /**
037:         * This class provides a way to find out what entities are contained in
038:         * what transaction.  It is used, to find which entities to call ejbStore()
039:         * on when a ejbFind() method is called within a transaction. EJB 2.0- 9.6.4
040:         * also, it is used to synchronize on a remove.
041:         * Used in EntitySynchronizationInterceptor, EntityContainer
042:         *
043:         * Entities are stored in an ArrayList to ensure specific ordering.
044:         *
045:         * @author <a href="bill@burkecentral.com">Bill Burke</a>
046:         * @author <a href="alex@jboss.org">Alexey Loubyansky</a>
047:         * @version $Revision: 62278 $
048:         */
049:        public class GlobalTxEntityMap {
050:            private static final Logger log = Logger
051:                    .getLogger(GlobalTxEntityMap.class);
052:
053:            private final TransactionLocal txSynch = new TransactionLocal();
054:
055:            /**
056:             * An instance can be in one of the three states:
057:             * <ul>
058:             * <li>not associated with the tx and, hence, does not need to be synchronized</li>
059:             * <li>associated with the tx and needs to be synchronized</li>
060:             * <li>associated with the tx but does not need to be synchronized</li>
061:             * </ul>
062:             * Implementations of TxAssociation implement these states.
063:             */
064:            public static interface TxAssociation {
065:                /**
066:                 * Schedules the instance for synchronization. The instance might or might not be associated with the tx.
067:                 *
068:                 * @param tx       the transaction the instance should be associated with if not yet associated
069:                 * @param instance the instance to be scheduled for synchronization
070:                 * @throws SystemException
071:                 * @throws RollbackException
072:                 */
073:                void scheduleSync(Transaction tx,
074:                        EntityEnterpriseContext instance)
075:                        throws SystemException, RollbackException;
076:
077:                /**
078:                 * Synchronizes the instance if it is needed.
079:                 * @param thread  current thread
080:                 * @param tx  current transaction
081:                 * @param instance  the instance to be synchronized
082:                 * @throws Exception  thrown if synchronization failed
083:                 */
084:                void synchronize(Thread thread, Transaction tx,
085:                        EntityEnterpriseContext instance) throws Exception;
086:
087:                /**
088:                 * Invokes ejbStore if needed
089:                 * @param thread  current thread
090:                 * @param instance  the instance to be synchronized
091:                 * @throws Exception  thrown if synchronization failed
092:                 */
093:                void invokeEjbStore(Thread thread,
094:                        EntityEnterpriseContext instance) throws Exception;
095:            }
096:
097:            public static final TxAssociation NONE = new TxAssociation() {
098:                public void scheduleSync(Transaction tx,
099:                        EntityEnterpriseContext instance)
100:                        throws SystemException, RollbackException {
101:                    EntityContainer.getGlobalTxEntityMap().associate(tx,
102:                            instance);
103:                    instance.setTxAssociation(SYNC_SCHEDULED);
104:                }
105:
106:                public void synchronize(Thread thread, Transaction tx,
107:                        EntityEnterpriseContext instance) {
108:                    throw new UnsupportedOperationException();
109:                }
110:
111:                public void invokeEjbStore(Thread thread,
112:                        EntityEnterpriseContext instance) {
113:                    throw new UnsupportedOperationException();
114:                }
115:            };
116:
117:            public static final TxAssociation SYNC_SCHEDULED = new TxAssociation() {
118:                public void scheduleSync(Transaction tx,
119:                        EntityEnterpriseContext instance) {
120:                }
121:
122:                public void invokeEjbStore(Thread thread,
123:                        EntityEnterpriseContext instance) throws Exception {
124:                    if (instance.getId() != null) {
125:                        EntityContainer container = (EntityContainer) instance
126:                                .getContainer();
127:                        // set the context class loader before calling the store method
128:                        SecurityActions.setContextClassLoader(thread, container
129:                                .getClassLoader());
130:
131:                        // store it
132:                        container.invokeEjbStore(instance);
133:                    }
134:                }
135:
136:                public void synchronize(Thread thread, Transaction tx,
137:                        EntityEnterpriseContext instance) throws Exception {
138:                    // only synchronize if the id is not null.  A null id means
139:                    // that the entity has been removed.
140:                    if (instance.getId() != null) {
141:                        EntityContainer container = (EntityContainer) instance
142:                                .getContainer();
143:
144:                        // set the context class loader before calling the store method
145:                        SecurityActions.setContextClassLoader(thread, container
146:                                .getClassLoader());
147:
148:                        // store it
149:                        container.storeEntity(instance);
150:
151:                        instance.setTxAssociation(SYNCHRONIZED);
152:                    }
153:                }
154:            };
155:
156:            public static final TxAssociation SYNCHRONIZED = new TxAssociation() {
157:                public void scheduleSync(Transaction tx,
158:                        EntityEnterpriseContext instance) {
159:                    instance.setTxAssociation(SYNC_SCHEDULED);
160:                }
161:
162:                public void invokeEjbStore(Thread thread,
163:                        EntityEnterpriseContext instance) {
164:                }
165:
166:                public void synchronize(Thread thread, Transaction tx,
167:                        EntityEnterpriseContext instance) {
168:                }
169:            };
170:
171:            public static final TxAssociation PREVENT_SYNC = new TxAssociation() {
172:                public void scheduleSync(Transaction tx,
173:                        EntityEnterpriseContext instance) {
174:                }
175:
176:                public void synchronize(Thread thread, Transaction tx,
177:                        EntityEnterpriseContext instance) throws Exception {
178:                    EntityContainer container = (EntityContainer) instance
179:                            .getContainer();
180:                    if (container.getPersistenceManager().isStoreRequired(
181:                            instance)) {
182:                        throw new EJBException(
183:                                "The instance of "
184:                                        + container.getBeanMetaData()
185:                                                .getEjbName()
186:                                        + " with pk="
187:                                        + instance.getId()
188:                                        + " was not stored to prevent potential inconsistency of data in the database:"
189:                                        + " the instance was evicted from the cache during the transaction"
190:                                        + " and the database was possibly updated by another process.");
191:                    }
192:                }
193:
194:                public void invokeEjbStore(Thread thread,
195:                        EntityEnterpriseContext instance) throws Exception {
196:                    GlobalTxEntityMap.SYNC_SCHEDULED.invokeEjbStore(thread,
197:                            instance);
198:                }
199:            };
200:
201:            /**
202:             * Used for instances in the create phase,
203:             * i.e. before the ejbCreate and until after the ejbPostCreate returns
204:             */
205:            public static final TxAssociation NOT_READY = new TxAssociation() {
206:                public void scheduleSync(Transaction tx,
207:                        EntityEnterpriseContext instance) {
208:                }
209:
210:                public void synchronize(Thread thread, Transaction tx,
211:                        EntityEnterpriseContext instance) throws Exception {
212:                }
213:
214:                public void invokeEjbStore(Thread thread,
215:                        EntityEnterpriseContext instance) throws Exception {
216:                }
217:            };
218:
219:            /**
220:             * sync all EntityEnterpriseContext that are involved (and changed)
221:             * within a transaction.
222:             */
223:            public void synchronizeEntities(Transaction tx) {
224:                GlobalTxSynchronization globalSync = (GlobalTxSynchronization) txSynch
225:                        .get(tx);
226:                if (globalSync != null) {
227:                    globalSync.synchronize();
228:                }
229:            }
230:
231:            /**
232:             * associate instance with transaction
233:             */
234:            private void associate(Transaction tx,
235:                    EntityEnterpriseContext entity) throws RollbackException,
236:                    SystemException {
237:                GlobalTxSynchronization globalSync = (GlobalTxSynchronization) txSynch
238:                        .get(tx);
239:                if (globalSync == null) {
240:                    globalSync = new GlobalTxSynchronization(tx);
241:                    txSynch.set(tx, globalSync);
242:                    tx.registerSynchronization(globalSync);
243:                }
244:
245:                //There should be only one thread associated with this tx at a time.
246:                //Therefore we should not need to synchronize on entityFifoList to ensure exclusive
247:                //access.  entityFifoList is correct since it was obtained in a synch block.
248:
249:                globalSync.associate(entity);
250:            }
251:
252:            // Inner
253:
254:            /**
255:             * A list of instances associated with the transaction.
256:             */
257:            private class GlobalTxSynchronization implements  Synchronization {
258:                private Transaction tx;
259:                private List instances = new ArrayList();
260:                private boolean synchronizing;
261:
262:                public GlobalTxSynchronization(Transaction tx) {
263:                    this .tx = tx;
264:                }
265:
266:                public void associate(EntityEnterpriseContext ctx) {
267:                    instances.add(ctx);
268:                }
269:
270:                public void synchronize() {
271:                    if (synchronizing || instances.isEmpty()) {
272:                        return;
273:                    }
274:
275:                    synchronizing = true;
276:
277:                    // This is an independent point of entry. We need to make sure the
278:                    // thread is associated with the right context class loader
279:                    Thread currentThread = Thread.currentThread();
280:                    ClassLoader oldCl = SecurityActions.getContextClassLoader();
281:
282:                    EntityEnterpriseContext instance = null;
283:                    try {
284:                        for (int i = 0; i < instances.size(); i++) {
285:                            // any one can mark the tx rollback at any time so check
286:                            // before continuing to the next store
287:                            if (tx.getStatus() == Status.STATUS_MARKED_ROLLBACK) {
288:                                return;
289:                            }
290:
291:                            instance = (EntityEnterpriseContext) instances
292:                                    .get(i);
293:                            instance.getTxAssociation().invokeEjbStore(
294:                                    currentThread, instance);
295:                        }
296:
297:                        for (int i = 0; i < instances.size(); i++) {
298:                            // any one can mark the tx rollback at any time so check
299:                            // before continuing to the next store
300:                            if (tx.getStatus() == Status.STATUS_MARKED_ROLLBACK) {
301:                                return;
302:                            }
303:
304:                            // read-only instances will never get into this list.
305:                            instance = (EntityEnterpriseContext) instances
306:                                    .get(i);
307:                            instance.getTxAssociation().synchronize(
308:                                    currentThread, tx, instance);
309:                        }
310:                    } catch (Exception causeByException) {
311:                        // EJB 1.1 section 12.3.2 and EJB 2 section 18.3.3
312:                        // exception during store must log exception, mark tx for
313:                        // rollback and throw a TransactionRolledback[Local]Exception
314:                        // if using caller's transaction.  All of this is handled by
315:                        // the AbstractTxInterceptor and LogInterceptor.
316:                        //
317:                        // All we need to do here is mark the transaction for rollback
318:                        // and rethrow the causeByException.  The caller will handle logging
319:                        // and wraping with TransactionRolledback[Local]Exception.
320:                        try {
321:                            tx.setRollbackOnly();
322:                        } catch (Exception e) {
323:                            log.warn("Exception while trying to rollback tx: "
324:                                    + tx, e);
325:                        }
326:
327:                        // Rethrow cause by exception
328:                        if (causeByException instanceof  EJBException) {
329:                            throw (EJBException) causeByException;
330:                        }
331:                        throw new EJBException(
332:                                "Exception in store of entity:"
333:                                        + ((instance == null || instance
334:                                                .getId() == null) ? "<null>"
335:                                                : instance.getId().toString()),
336:                                causeByException);
337:                    } finally {
338:                        SecurityActions.setContextClassLoader(oldCl);
339:                        synchronizing = false;
340:                    }
341:                }
342:
343:                // Synchronization implementation -----------------------------
344:
345:                public void beforeCompletion() {
346:                    if (log.isTraceEnabled()) {
347:                        log.trace("beforeCompletion called for tx " + tx);
348:                    }
349:
350:                    // let the runtime exceptions fall out, so the committer can determine
351:                    // the root cause of a rollback
352:                    synchronize();
353:                }
354:
355:                public void afterCompletion(int status) {
356:                    //no-op
357:                }
358:            }
359:        }
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