Spring坿旗鷹盾裂?伊??Spring駁強Hibernate議糞? - 園殻秘壇利
作者 佚名技术
来源 NET编程
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发布时间 2012-06-17
| SessionFactory sessionFactory, Interceptor entityInterceptor, SQLExceptionTranslator jdbcExceptionTranslator, boolean allowCreate) throws HibernateException, IllegalStateException { Assert.notNull(sessionFactory, "No SessionFactory specified"); //这个TransactionSynchronizationManager的Resource是一个ThreadLocal 变量,sessionFactory是一个单例，但ThreadLocal是和线程绑定的 //这样就实现了Hiberante中常用的通过ThreadLocal的session管理机制 SessionHolder sessionHolder = (SessionHolder) TransactionSynchronizationManager.getResource(sessionFactory); if (sessionHolder != null && !sessionHolder.isEmpty()) { // pre-bound Hibernate Session Session session = null; if (TransactionSynchronizationManager.isSynchronizationActive() && sessionHolder.doesNotHoldNonDefaultSession()) { // Spring transaction management is active -> // register pre-bound Session with it for transactional flushing. session = sessionHolder.getValidatedSession(); if (session != null && ! sessionHolder.isSynchronizedWithTransaction()) { logger.debug("Registering Spring transaction synchronization for existing Hibernate Session"); TransactionSynchronizationManager.registerSynchronization( new SpringSessionSynchronization(sessionHolder, sessionFactory, jdbcExceptionTranslator, false)); sessionHolder.setSynchronizedWithTransaction(true); // Switch to FlushMode.AUTO, as we have to assume a thread-bound Session // with FlushMode.NEVER, which needs to allow flushing within the transaction. FlushMode flushMode = session.getFlushMode(); if (flushMode.lessThan(FlushMode.COMMIT) && ! TransactionSynchronizationManager.isCurrentTransactionReadOnly()) { session.setFlushMode(FlushMode.AUTO); sessionHolder.setPreviousFlushMode(flushMode); } } } else { // No Spring transaction management active -> try JTA transaction synchronization. session = getJtaSynchronizedSession(sessionHolder, sessionFactory, jdbcExceptionTranslator); } if (session != null) { return session; } } //这里直接打开一个Session logger.debug("Opening Hibernate Session"); Session session = (entityInterceptor != null ? sessionFactory.openSession(entityInterceptor) : sessionFactory.openSession()); // Use same Session for further Hibernate actions within the transaction. // Thread object will get remove |
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