ThreadLocalSessionContext (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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org.hibernate.context
Class ThreadLocalSessionContext

java.lang.Object
  org.hibernate.context.ThreadLocalSessionContext

All Implemented Interfaces:: CurrentSessionContext, Serializable

public class ThreadLocalSessionContext
extends Object
implements CurrentSessionContext

A CurrentSessionContext impl which scopes the notion of current session by the current thread of execution. Unlike the JTA counterpart, threads do not give us a nice hook to perform any type of cleanup making it questionable for this impl to actually generate Session instances. In the interest of usability, it was decided to have this default impl actually generate a session upon first request and then clean it up after the Transaction associated with that session is committed/rolled-back. In order for ensuring that happens, the sessions generated here are unusable until after Session.beginTransaction() has been called. If close() is called on a session managed by this class, it will be automatically unbound.

Additionally, the static bind(org.hibernate.Session) and unbind(org.hibernate.SessionFactory) methods are provided to allow application code to explicitly control opening and closing of these sessions. This, with some from of interception, is the preferred approach. It also allows easy framework integration and one possible approach for implementing long-sessions.

The buildOrObtainSession(), isAutoCloseEnabled(), isAutoFlushEnabled(), getConnectionReleaseMode(), and buildCleanupSynch() methods are all provided to allow easy subclassing (for long- running session scenarios, for example).

Author:: Steve Ebersole
See Also:: Serialized Form

Nested Class Summary

protected static class ThreadLocalSessionContext.CleanupSynch
          JTA transaction synch used for cleanup of the internal session map.

Field Summary

protected SessionFactoryImplementor factory


Constructor Summary

ThreadLocalSessionContext(SessionFactoryImplementor factory)


Method Summary

static void bind(Session session)
          Associates the given session with the current thread of execution.

protected ThreadLocalSessionContext.CleanupSynch buildCleanupSynch()


protected Session buildOrObtainSession()
          Strictly provided for subclassing purposes; specifically to allow long-session support.

Session currentSession()
          Retrieve the current session according to the scoping defined by this implementation.

protected ConnectionReleaseMode getConnectionReleaseMode()
          Mainly for subclass usage.

protected SessionFactoryImplementor getFactory()


protected boolean isAutoCloseEnabled()
          Mainly for subclass usage.

protected boolean isAutoFlushEnabled()
          Mainly for subclass usage.

protected static Map sessionMap()


static Session unbind(SessionFactory factory)
          Unassociate a previously bound session from the current thread of execution.

protected Session wrap(Session session)


Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

factory

protected final SessionFactoryImplementor factory

Constructor Detail