Source Code Cross Referenced for SpringSessionSynchronization.java in  » J2EE » spring-framework-2.0.6 » org » springframework » orm » hibernate3 » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.orm.hibernate3 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2006 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.orm.hibernate3;
018:
019:        import javax.transaction.SystemException;
020:        import javax.transaction.Transaction;
021:        import javax.transaction.TransactionManager;
022:
023:        import org.hibernate.FlushMode;
024:        import org.hibernate.HibernateException;
025:        import org.hibernate.JDBCException;
026:        import org.hibernate.Session;
027:        import org.hibernate.SessionFactory;
028:        import org.hibernate.engine.SessionImplementor;
029:
030:        import org.springframework.core.Ordered;
031:        import org.springframework.dao.DataAccessException;
032:        import org.springframework.dao.DataAccessResourceFailureException;
033:        import org.springframework.jdbc.support.SQLExceptionTranslator;
034:        import org.springframework.transaction.support.TransactionSynchronizationAdapter;
035:        import org.springframework.transaction.support.TransactionSynchronizationManager;
036:
037:        /**
038:         * Callback for resource cleanup at the end of a Spring-managed JTA transaction,
039:         * that is, when participating in a JtaTransactionManager transaction.
040:         *
041:         * @author Juergen Hoeller
042:         * @since 1.2
043:         * @see SessionFactoryUtils
044:         * @see org.springframework.transaction.jta.JtaTransactionManager
045:         */
046:        class SpringSessionSynchronization extends
047:                TransactionSynchronizationAdapter implements  Ordered {
048:
049:            private final SessionHolder sessionHolder;
050:
051:            private final SessionFactory sessionFactory;
052:
053:            private final SQLExceptionTranslator jdbcExceptionTranslator;
054:
055:            private final boolean newSession;
056:
057:            /**
058:             * Whether Hibernate has a looked-up JTA TransactionManager that it will
059:             * automatically register CacheSynchronizations with on Session connect.
060:             */
061:            private boolean hibernateTransactionCompletion = false;
062:
063:            private Transaction jtaTransaction;
064:
065:            private boolean holderActive = true;
066:
067:            public SpringSessionSynchronization(SessionHolder sessionHolder,
068:                    SessionFactory sessionFactory,
069:                    SQLExceptionTranslator jdbcExceptionTranslator,
070:                    boolean newSession) {
071:
072:                this .sessionHolder = sessionHolder;
073:                this .sessionFactory = sessionFactory;
074:                this .jdbcExceptionTranslator = jdbcExceptionTranslator;
075:                this .newSession = newSession;
076:
077:                // Check whether the SessionFactory has a JTA TransactionManager.
078:                TransactionManager jtaTm = SessionFactoryUtils
079:                        .getJtaTransactionManager(sessionFactory, sessionHolder
080:                                .getAnySession());
081:                if (jtaTm != null) {
082:                    this .hibernateTransactionCompletion = true;
083:                    // Fetch current JTA Transaction object
084:                    // (just necessary for JTA transaction suspension, with an individual
085:                    // Hibernate Session per currently active/suspended transaction).
086:                    try {
087:                        this .jtaTransaction = jtaTm.getTransaction();
088:                    } catch (SystemException ex) {
089:                        throw new DataAccessResourceFailureException(
090:                                "Could not access JTA transaction", ex);
091:                    }
092:                }
093:            }
094:
095:            public int getOrder() {
096:                return SessionFactoryUtils.SESSION_SYNCHRONIZATION_ORDER;
097:            }
098:
099:            public void suspend() {
100:                if (this .holderActive) {
101:                    TransactionSynchronizationManager
102:                            .unbindResource(this .sessionFactory);
103:                }
104:            }
105:
106:            public void resume() {
107:                if (this .holderActive) {
108:                    TransactionSynchronizationManager.bindResource(
109:                            this .sessionFactory, this .sessionHolder);
110:                }
111:            }
112:
113:            public void beforeCommit(boolean readOnly)
114:                    throws DataAccessException {
115:                if (!readOnly) {
116:                    Session session = null;
117:                    // Check whether there is a Hibernate Session for the current JTA
118:                    // transaction. Else, fall back to the default thread-bound Session.
119:                    if (this .jtaTransaction != null) {
120:                        session = this .sessionHolder
121:                                .getSession(this .jtaTransaction);
122:                    }
123:                    if (session == null) {
124:                        session = this .sessionHolder.getSession();
125:                    }
126:                    // Read-write transaction -> flush the Hibernate Session.
127:                    // Further check: only flush when not FlushMode.NEVER/MANUAL.
128:                    if (!session.getFlushMode().lessThan(FlushMode.COMMIT)) {
129:                        try {
130:                            SessionFactoryUtils.logger
131:                                    .debug("Flushing Hibernate Session on transaction synchronization");
132:                            session.flush();
133:                        } catch (HibernateException ex) {
134:                            if (this .jdbcExceptionTranslator != null
135:                                    && ex instanceof  JDBCException) {
136:                                JDBCException jdbcEx = (JDBCException) ex;
137:                                throw this .jdbcExceptionTranslator.translate(
138:                                        "Hibernate flushing: "
139:                                                + jdbcEx.getMessage(), jdbcEx
140:                                                .getSQL(), jdbcEx
141:                                                .getSQLException());
142:                            }
143:                            throw SessionFactoryUtils
144:                                    .convertHibernateAccessException(ex);
145:                        }
146:                    }
147:                }
148:            }
149:
150:            public void beforeCompletion() {
151:                if (this .jtaTransaction != null) {
152:                    // Typically in case of a suspended JTA transaction:
153:                    // Remove the Session for the current JTA transaction, but keep the holder.
154:                    Session session = this .sessionHolder
155:                            .removeSession(this .jtaTransaction);
156:                    if (session != null) {
157:                        if (this .sessionHolder.isEmpty()) {
158:                            // No Sessions for JTA transactions bound anymore -> could remove it.
159:                            if (TransactionSynchronizationManager
160:                                    .hasResource(this .sessionFactory)) {
161:                                // Explicit check necessary because of remote transaction propagation:
162:                                // The synchronization callbacks will execute in a different thread
163:                                // in such a scenario, as they're triggered by a remote server.
164:                                // The best we can do is to leave the SessionHolder bound to the
165:                                // thread that originally performed the data access. It will be
166:                                // reused when a new data access operation starts on that thread.
167:                                TransactionSynchronizationManager
168:                                        .unbindResource(this .sessionFactory);
169:                            }
170:                            this .holderActive = false;
171:                        }
172:                        // Do not close a pre-bound Session. In that case, we'll find the
173:                        // transaction-specific Session the same as the default Session.
174:                        if (session != this .sessionHolder.getSession()) {
175:                            SessionFactoryUtils
176:                                    .closeSessionOrRegisterDeferredClose(
177:                                            session, this .sessionFactory);
178:                        } else if (this .sessionHolder.getPreviousFlushMode() != null) {
179:                            // In case of pre-bound Session, restore previous flush mode.
180:                            session.setFlushMode(this .sessionHolder
181:                                    .getPreviousFlushMode());
182:                        }
183:                        return;
184:                    }
185:                }
186:                // We'll only get here if there was no specific JTA transaction to handle.
187:                if (this .newSession) {
188:                    // Default behavior: unbind and close the thread-bound Hibernate Session.
189:                    TransactionSynchronizationManager
190:                            .unbindResource(this .sessionFactory);
191:                    this .holderActive = false;
192:                    if (this .hibernateTransactionCompletion) {
193:                        // Close the Hibernate Session here in case of a Hibernate TransactionManagerLookup:
194:                        // Hibernate will automatically defer the actual closing until JTA transaction completion.
195:                        // Else, the Session will be closed in the afterCompletion method, to provide the
196:                        // correct transaction status for releasing the Session's cache locks.
197:                        SessionFactoryUtils
198:                                .closeSessionOrRegisterDeferredClose(
199:                                        this .sessionHolder.getSession(),
200:                                        this .sessionFactory);
201:                    }
202:                } else if (this .sessionHolder.getPreviousFlushMode() != null) {
203:                    // In case of pre-bound Session, restore previous flush mode.
204:                    this .sessionHolder.getSession().setFlushMode(
205:                            this .sessionHolder.getPreviousFlushMode());
206:                }
207:            }
208:
209:            public void afterCompletion(int status) {
210:                if (!this .hibernateTransactionCompletion || !this .newSession) {
211:                    // No Hibernate TransactionManagerLookup: apply afterTransactionCompletion callback.
212:                    // Always perform explicit afterTransactionCompletion callback for pre-bound Session,
213:                    // even with Hibernate TransactionManagerLookup (which only applies to new Sessions).
214:                    Session session = this .sessionHolder.getSession();
215:                    // Provide correct transaction status for releasing the Session's cache locks,
216:                    // if possible. Else, closing will release all cache locks assuming a rollback.
217:                    if (session instanceof  SessionImplementor) {
218:                        ((SessionImplementor) session)
219:                                .afterTransactionCompletion(
220:                                        status == STATUS_COMMITTED, null);
221:                    }
222:                    // Close the Hibernate Session here if necessary
223:                    // (closed in beforeCompletion in case of TransactionManagerLookup).
224:                    if (this .newSession) {
225:                        SessionFactoryUtils
226:                                .closeSessionOrRegisterDeferredClose(session,
227:                                        this .sessionFactory);
228:                    }
229:                }
230:                if (!this .newSession && status != STATUS_COMMITTED) {
231:                    // Clear all pending inserts/updates/deletes in the Session.
232:                    // Necessary for pre-bound Sessions, to avoid inconsistent state.
233:                    this .sessionHolder.getSession().clear();
234:                }
235:                if (this .sessionHolder.doesNotHoldNonDefaultSession()) {
236:                    this .sessionHolder.setSynchronizedWithTransaction(false);
237:                }
238:            }
239:
240:        }
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