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


001:        /*
002:         * Copyright 2002-2007 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.hibernate;
018:
019:        import java.sql.SQLException;
020:
021:        import net.sf.hibernate.FlushMode;
022:        import net.sf.hibernate.HibernateException;
023:        import net.sf.hibernate.Interceptor;
024:        import net.sf.hibernate.JDBCException;
025:        import net.sf.hibernate.Session;
026:        import net.sf.hibernate.SessionFactory;
027:        import org.apache.commons.logging.Log;
028:        import org.apache.commons.logging.LogFactory;
029:
030:        import org.springframework.beans.BeansException;
031:        import org.springframework.beans.factory.BeanFactory;
032:        import org.springframework.beans.factory.BeanFactoryAware;
033:        import org.springframework.beans.factory.InitializingBean;
034:        import org.springframework.core.Constants;
035:        import org.springframework.dao.DataAccessException;
036:        import org.springframework.jdbc.support.SQLExceptionTranslator;
037:
038:        /**
039:         * Base class for {@link HibernateTemplate} and {@link HibernateInterceptor},
040:         * defining common properties such as SessionFactory and flushing behavior.
041:         *
042:         * <p>Not intended to be used directly.
043:         * See {@link HibernateTemplate} and {@link HibernateInterceptor}.
044:         *
045:         * @author Juergen Hoeller
046:         * @since 29.07.2003
047:         * @see HibernateTemplate
048:         * @see HibernateInterceptor
049:         * @see #setFlushMode
050:         */
051:        public abstract class HibernateAccessor implements  InitializingBean,
052:                BeanFactoryAware {
053:
054:            /**
055:             * Never flush is a good strategy for read-only units of work.
056:             * Hibernate will not track and look for changes in this case,
057:             * avoiding any overhead of modification detection.
058:             * <p>In case of an existing Session, FLUSH_NEVER will turn the flush mode
059:             * to NEVER for the scope of the current operation, resetting the previous
060:             * flush mode afterwards.
061:             * @see #setFlushMode
062:             */
063:            public static final int FLUSH_NEVER = 0;
064:
065:            /**
066:             * Automatic flushing is the default mode for a Hibernate Session.
067:             * A session will get flushed on transaction commit, and on certain find
068:             * operations that might involve already modified instances, but not
069:             * after each unit of work like with eager flushing.
070:             * <p>In case of an existing Session, FLUSH_AUTO will participate in the
071:             * existing flush mode, not modifying it for the current operation.
072:             * This in particular means that this setting will not modify an existing
073:             * flush mode NEVER, in contrast to FLUSH_EAGER.
074:             * @see #setFlushMode
075:             */
076:            public static final int FLUSH_AUTO = 1;
077:
078:            /**
079:             * Eager flushing leads to immediate synchronization with the database,
080:             * even if in a transaction. This causes inconsistencies to show up and throw
081:             * a respective exception immediately, and JDBC access code that participates
082:             * in the same transaction will see the changes as the database is already
083:             * aware of them then. But the drawbacks are:
084:             * <ul>
085:             * <li>additional communication roundtrips with the database, instead of a
086:             * single batch at transaction commit;
087:             * <li>the fact that an actual database rollback is needed if the Hibernate
088:             * transaction rolls back (due to already submitted SQL statements).
089:             * </ul>
090:             * <p>In case of an existing Session, FLUSH_EAGER will turn the flush mode
091:             * to AUTO for the scope of the current operation and issue a flush at the
092:             * end, resetting the previous flush mode afterwards.
093:             * @see #setFlushMode
094:             */
095:            public static final int FLUSH_EAGER = 2;
096:
097:            /**
098:             * Flushing at commit only is intended for units of work where no
099:             * intermediate flushing is desired, not even for find operations
100:             * that might involve already modified instances.
101:             * <p>In case of an existing Session, FLUSH_COMMIT will turn the flush mode
102:             * to COMMIT for the scope of the current operation, resetting the previous
103:             * flush mode afterwards. The only exception is an existing flush mode
104:             * NEVER, which will not be modified through this setting.
105:             * @see #setFlushMode
106:             */
107:            public static final int FLUSH_COMMIT = 3;
108:
109:            /** Constants instance for HibernateAccessor */
110:            private static final Constants constants = new Constants(
111:                    HibernateAccessor.class);
112:
113:            /** Logger available to subclasses */
114:            protected final Log logger = LogFactory.getLog(getClass());
115:
116:            private SessionFactory sessionFactory;
117:
118:            private Object entityInterceptor;
119:
120:            private SQLExceptionTranslator jdbcExceptionTranslator;
121:
122:            private int flushMode = FLUSH_AUTO;
123:
124:            /**
125:             * Just needed for entityInterceptorBeanName.
126:             * @see #setEntityInterceptorBeanName
127:             */
128:            private BeanFactory beanFactory;
129:
130:            /**
131:             * Set the Hibernate SessionFactory that should be used to create
132:             * Hibernate Sessions.
133:             */
134:            public void setSessionFactory(SessionFactory sessionFactory) {
135:                this .sessionFactory = sessionFactory;
136:            }
137:
138:            /**
139:             * Return the Hibernate SessionFactory that should be used to create
140:             * Hibernate Sessions.
141:             */
142:            public SessionFactory getSessionFactory() {
143:                return this .sessionFactory;
144:            }
145:
146:            /**
147:             * Set the bean name of a Hibernate entity interceptor that allows to inspect
148:             * and change property values before writing to and reading from the database.
149:             * Will get applied to any new Session created by this transaction manager.
150:             * <p>Requires the bean factory to be known, to be able to resolve the bean
151:             * name to an interceptor instance on session creation. Typically used for
152:             * prototype interceptors, i.e. a new interceptor instance per session.
153:             * <p>Can also be used for shared interceptor instances, but it is recommended
154:             * to set the interceptor reference directly in such a scenario.
155:             * @param entityInterceptorBeanName the name of the entity interceptor in
156:             * the bean factory
157:             * @see #setBeanFactory
158:             * @see #setEntityInterceptor
159:             */
160:            public void setEntityInterceptorBeanName(
161:                    String entityInterceptorBeanName) {
162:                this .entityInterceptor = entityInterceptorBeanName;
163:            }
164:
165:            /**
166:             * Set a Hibernate entity interceptor that allows to inspect and change
167:             * property values before writing to and reading from the database.
168:             * Will get applied to any <b>new</b> Session created by this object.
169:             * <p>Such an interceptor can either be set at the SessionFactory level,
170:             * i.e. on LocalSessionFactoryBean, or at the Session level, i.e. on
171:             * HibernateTemplate, HibernateInterceptor, and HibernateTransactionManager.
172:             * It's preferable to set it on LocalSessionFactoryBean or HibernateTransactionManager
173:             * to avoid repeated configuration and guarantee consistent behavior in transactions.
174:             * @see #setEntityInterceptorBeanName
175:             * @see LocalSessionFactoryBean#setEntityInterceptor
176:             * @see HibernateTransactionManager#setEntityInterceptor
177:             */
178:            public void setEntityInterceptor(Interceptor entityInterceptor) {
179:                this .entityInterceptor = entityInterceptor;
180:            }
181:
182:            /**
183:             * Return the current Hibernate entity interceptor, or <code>null</code> if none.
184:             * Resolves an entity interceptor bean name via the bean factory,
185:             * if necessary.
186:             * @throws IllegalStateException if bean name specified but no bean factory set
187:             * @throws org.springframework.beans.BeansException if bean name resolution via the bean factory failed
188:             * @see #setEntityInterceptor
189:             * @see #setEntityInterceptorBeanName
190:             * @see #setBeanFactory
191:             */
192:            public Interceptor getEntityInterceptor()
193:                    throws IllegalStateException, BeansException {
194:                if (this .entityInterceptor instanceof  String) {
195:                    if (this .beanFactory == null) {
196:                        throw new IllegalStateException(
197:                                "Cannot get entity interceptor via bean name if no bean factory set");
198:                    }
199:                    return (Interceptor) this .beanFactory.getBean(
200:                            (String) this .entityInterceptor, Interceptor.class);
201:                }
202:                return (Interceptor) this .entityInterceptor;
203:            }
204:
205:            /**
206:             * Set the JDBC exception translator for this instance.
207:             * Applied to SQLExceptions thrown by callback code, be it direct
208:             * SQLExceptions or wrapped Hibernate JDBCExceptions.
209:             * <p>The default exception translator is either a SQLErrorCodeSQLExceptionTranslator
210:             * if a DataSource is available, or a SQLStateSQLExceptionTranslator else.
211:             * @param jdbcExceptionTranslator the exception translator
212:             * @see java.sql.SQLException
213:             * @see net.sf.hibernate.JDBCException
214:             * @see SessionFactoryUtils#newJdbcExceptionTranslator
215:             * @see org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator
216:             * @see org.springframework.jdbc.support.SQLStateSQLExceptionTranslator
217:             */
218:            public void setJdbcExceptionTranslator(
219:                    SQLExceptionTranslator jdbcExceptionTranslator) {
220:                this .jdbcExceptionTranslator = jdbcExceptionTranslator;
221:            }
222:
223:            /**
224:             * Return the JDBC exception translator for this instance.
225:             * <p>Creates a default SQLErrorCodeSQLExceptionTranslator or SQLStateSQLExceptionTranslator
226:             * for the specified SessionFactory, if no exception translator explicitly specified.
227:             */
228:            public synchronized SQLExceptionTranslator getJdbcExceptionTranslator() {
229:                if (this .jdbcExceptionTranslator == null) {
230:                    this .jdbcExceptionTranslator = SessionFactoryUtils
231:                            .newJdbcExceptionTranslator(getSessionFactory());
232:                }
233:                return this .jdbcExceptionTranslator;
234:            }
235:
236:            /**
237:             * Set the flush behavior by the name of the respective constant
238:             * in this class, e.g. "FLUSH_AUTO". Default is "FLUSH_AUTO".
239:             * @param constantName name of the constant
240:             * @see #setFlushMode
241:             * @see #FLUSH_AUTO
242:             */
243:            public void setFlushModeName(String constantName) {
244:                setFlushMode(constants.asNumber(constantName).intValue());
245:            }
246:
247:            /**
248:             * Set the flush behavior to one of the constants in this class.
249:             * Default is FLUSH_AUTO.
250:             * @see #setFlushModeName
251:             * @see #FLUSH_AUTO
252:             */
253:            public void setFlushMode(int flushMode) {
254:                this .flushMode = flushMode;
255:            }
256:
257:            /**
258:             * Return if a flush should be forced after executing the callback code.
259:             */
260:            public int getFlushMode() {
261:                return this .flushMode;
262:            }
263:
264:            /**
265:             * The bean factory just needs to be known for resolving entity interceptor
266:             * bean names. It does not need to be set for any other mode of operation.
267:             * @see #setEntityInterceptorBeanName
268:             */
269:            public void setBeanFactory(BeanFactory beanFactory) {
270:                this .beanFactory = beanFactory;
271:            }
272:
273:            public void afterPropertiesSet() {
274:                if (getSessionFactory() == null) {
275:                    throw new IllegalArgumentException(
276:                            "Property 'sessionFactory' is required");
277:                }
278:            }
279:
280:            /**
281:             * Apply the flush mode that's been specified for this accessor
282:             * to the given Session.
283:             * @param session the current Hibernate Session
284:             * @param existingTransaction if executing within an existing transaction
285:             * @return the previous flush mode to restore after the operation,
286:             * or <code>null</code> if none
287:             * @see #setFlushMode
288:             * @see net.sf.hibernate.Session#setFlushMode
289:             */
290:            protected FlushMode applyFlushMode(Session session,
291:                    boolean existingTransaction) {
292:                if (getFlushMode() == FLUSH_NEVER) {
293:                    if (existingTransaction) {
294:                        FlushMode previousFlushMode = session.getFlushMode();
295:                        if (!previousFlushMode.equals(FlushMode.NEVER)) {
296:                            session.setFlushMode(FlushMode.NEVER);
297:                            return previousFlushMode;
298:                        }
299:                    } else {
300:                        session.setFlushMode(FlushMode.NEVER);
301:                    }
302:                } else if (getFlushMode() == FLUSH_EAGER) {
303:                    if (existingTransaction) {
304:                        FlushMode previousFlushMode = session.getFlushMode();
305:                        if (!previousFlushMode.equals(FlushMode.AUTO)) {
306:                            session.setFlushMode(FlushMode.AUTO);
307:                            return previousFlushMode;
308:                        }
309:                    } else {
310:                        // rely on default FlushMode.AUTO
311:                    }
312:                } else if (getFlushMode() == FLUSH_COMMIT) {
313:                    if (existingTransaction) {
314:                        FlushMode previousFlushMode = session.getFlushMode();
315:                        if (previousFlushMode.equals(FlushMode.AUTO)) {
316:                            session.setFlushMode(FlushMode.COMMIT);
317:                            return previousFlushMode;
318:                        }
319:                    } else {
320:                        session.setFlushMode(FlushMode.COMMIT);
321:                    }
322:                }
323:                return null;
324:            }
325:
326:            /**
327:             * Flush the given Hibernate Session if necessary.
328:             * @param session the current Hibernate Session
329:             * @param existingTransaction if executing within an existing transaction
330:             * @throws HibernateException in case of Hibernate flushing errors
331:             */
332:            protected void flushIfNecessary(Session session,
333:                    boolean existingTransaction) throws HibernateException {
334:                if (getFlushMode() == FLUSH_EAGER
335:                        || (!existingTransaction && getFlushMode() != FLUSH_NEVER)) {
336:                    logger.debug("Eagerly flushing Hibernate session");
337:                    session.flush();
338:                }
339:            }
340:
341:            /**
342:             * Convert the given HibernateException to an appropriate exception from the
343:             * <code>org.springframework.dao</code> hierarchy. Will automatically detect
344:             * wrapped SQLExceptions and convert them accordingly.
345:             * <p>The default implementation delegates to SessionFactoryUtils
346:             * and {@link #convertJdbcAccessException}. Can be overridden in subclasses.
347:             * @param ex HibernateException that occured
348:             * @return the corresponding DataAccessException instance
349:             * @see #convertJdbcAccessException(net.sf.hibernate.JDBCException)
350:             * @see SessionFactoryUtils#convertHibernateAccessException
351:             */
352:            public DataAccessException convertHibernateAccessException(
353:                    HibernateException ex) {
354:                if (ex instanceof  JDBCException) {
355:                    return convertJdbcAccessException((JDBCException) ex);
356:                }
357:                return SessionFactoryUtils.convertHibernateAccessException(ex);
358:            }
359:
360:            /**
361:             * Convert the given JDBCException to an appropriate exception from the
362:             * <code>org.springframework.dao</code> hierarchy. Can be overridden in subclasses.
363:             * @param ex JDBCException that occured, wrapping a SQLException
364:             * @return the corresponding DataAccessException instance
365:             * @see #setJdbcExceptionTranslator
366:             */
367:            protected DataAccessException convertJdbcAccessException(
368:                    JDBCException ex) {
369:                return getJdbcExceptionTranslator().translate(
370:                        "Hibernate operation: " + ex.getMessage(), null,
371:                        ex.getSQLException());
372:            }
373:
374:            /**
375:             * Convert the given SQLException to an appropriate exception from the
376:             * <code>org.springframework.dao</code> hierarchy. Can be overridden in subclasses.
377:             * <p>Note that a direct SQLException can just occur when callback code
378:             * performs direct JDBC access via <code>Session.connection()</code>.
379:             * @param ex the SQLException
380:             * @return the corresponding DataAccessException instance
381:             * @see #setJdbcExceptionTranslator
382:             * @see net.sf.hibernate.Session#connection()
383:             */
384:            protected DataAccessException convertJdbcAccessException(
385:                    SQLException ex) {
386:                return getJdbcExceptionTranslator().translate(
387:                        "Hibernate operation", null, ex);
388:            }
389:
390:        }
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