org.hibernate.context.internal

Class ThreadLocalSessionContext

java.lang.Object

org.hibernate.context.spi.AbstractCurrentSessionContext

org.hibernate.context.internal.ThreadLocalSessionContext

All Implemented Interfaces:

Serializable, CurrentSessionContext

public class ThreadLocalSessionContext
extends AbstractCurrentSessionContext

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 SharedSessionContract.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, Sanne Grinovero

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	ThreadLocalSessionContext.CleanupSync Transaction sync used for cleanup of the internal session map.

Constructor Summary

Constructors

Constructor and Description
ThreadLocalSessionContext(SessionFactoryImplementor factory) Constructs a ThreadLocal

Method Summary

Modifier and Type	Method and Description
static void	bind(Session session) Associates the given session with the current thread of execution.
protected ThreadLocalSessionContext.CleanupSync	buildCleanupSynch()
protected Session	buildOrObtainSession() Strictly provided for sub-classing 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() Getter for property 'factory'.
protected boolean	isAutoCloseEnabled() Mainly for subclass usage.
protected boolean	isAutoFlushEnabled() Mainly for subclass usage.
protected static Map<SessionFactory,Session>	sessionMap()
static Session	unbind(SessionFactory factory) Disassociates a previously bound session from the current thread of execution.
protected Session	wrap(Session session)

Methods inherited from class org.hibernate.context.spi.AbstractCurrentSessionContext

baseSessionBuilder, factory, validateExistingSession

Methods inherited from class java.lang.Object

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

Constructor Detail

ThreadLocalSessionContext

public ThreadLocalSessionContext(SessionFactoryImplementor factory)

Constructs a ThreadLocal

Parameters:

factory - The factory this context will service

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.

Returns:

The current session.

Throws:

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

getFactory

protected SessionFactoryImplementor getFactory()

Getter for property 'factory'.

Returns:

Value for property 'factory'.

buildOrObtainSession

protected Session buildOrObtainSession()

Strictly provided for sub-classing 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.CleanupSync 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)

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

Parameters:

factory - The factory for which the session should be unbound.

Returns:

The session which was unbound.

sessionMap

protected static Map<SessionFactory,Session> sessionMap()