org.hibernate.context
Class ThreadLocalSessionContext

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

All Implemented Interfaces:

Serializable, CurrentSessionContext

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

ThreadLocalSessionContext

public ThreadLocalSessionContext(SessionFactoryImplementor factory)

Method Detail

currentSession

public final Session currentSession()
                             throws HibernateException

Description copied from interface: CurrentSessionContext

Retrieve the current session according to the scoping defined by this implementation.

Specified by:

currentSession in interface CurrentSessionContext

Returns:

The current session.

Throws:

HibernateException - Typically indicates an issue locating or creating the current session.

getFactory

protected SessionFactoryImplementor getFactory()

buildOrObtainSession

protected Session buildOrObtainSession()

Strictly provided for subclassing purposes; specifically to allow long-session support.

This implementation always just opens a new session.

Returns:

the built or (re)obtained session.

buildCleanupSynch

protected ThreadLocalSessionContext.CleanupSynch buildCleanupSynch()

isAutoCloseEnabled

protected boolean isAutoCloseEnabled()

Mainly for subclass usage. This impl always returns true.

Returns:

Whether or not the the session should be closed by transaction completion.

isAutoFlushEnabled

protected boolean isAutoFlushEnabled()

Mainly for subclass usage. This impl always returns true.

Returns:

Whether or not the the session should be flushed prior transaction completion.

getConnectionReleaseMode

protected ConnectionReleaseMode getConnectionReleaseMode()

Mainly for subclass usage. This impl always returns after_transaction.

Returns:

The connection release mode for any built sessions.

wrap

protected Session wrap(Session session)

bind

public static void bind(Session session)

Associates the given session with the current thread of execution.

Parameters:

session - The session to bind.

unbind

public static Session unbind(SessionFactory factory)

Unassociate a previously bound session from the current thread of execution.

Returns:

The session which was unbound.

sessionMap

protected static Map sessionMap()