org.springframework.transaction.support

Class ResourceHolderSynchronization<H extends ResourceHolder,K>

java.lang.Object

org.springframework.transaction.support.ResourceHolderSynchronization<H,K>

All Implemented Interfaces:

java.io.Flushable, TransactionSynchronization

public abstract class ResourceHolderSynchronization<H extends ResourceHolder,K>
extends java.lang.Object
implements TransactionSynchronization

TransactionSynchronization implementation that manages a ResourceHolder bound through TransactionSynchronizationManager.

Since:

2.5.5

Author:

Juergen Hoeller

Field Summary

Fields inherited from interface org.springframework.transaction.support.TransactionSynchronization

STATUS_COMMITTED, STATUS_ROLLED_BACK, STATUS_UNKNOWN

Constructor Summary

Constructors

Constructor and Description
ResourceHolderSynchronization(H resourceHolder, K resourceKey) Create a new ResourceHolderSynchronization for the given holder.

Method Summary

Modifier and Type	Method and Description
void	afterCommit() Invoked after transaction commit.
void	afterCompletion(int status) Invoked after transaction commit/rollback.
void	beforeCommit(boolean readOnly) Invoked before transaction commit (before "beforeCompletion").
void	beforeCompletion() Invoked before transaction commit/rollback.
protected void	cleanupResource(H resourceHolder, K resourceKey, boolean committed) Perform a cleanup on the given resource (which is left bound to the thread).
void	flush() Flush the underlying session to the datastore, if applicable: for example, a Hibernate/JPA session.
protected void	flushResource(H resourceHolder) Flush callback for the given resource holder.
protected void	processResourceAfterCommit(H resourceHolder) After-commit callback for the given resource holder.
protected void	releaseResource(H resourceHolder, K resourceKey) Release the given resource (after it has been unbound from the thread).
void	resume() Resume this synchronization.
protected boolean	shouldReleaseAfterCompletion(H resourceHolder) Return whether this holder's resource should be released after transaction completion (true).
protected boolean	shouldReleaseBeforeCompletion() Return whether this holder's resource should be released before transaction completion (true) or rather after transaction completion (false).
protected boolean	shouldUnbindAtCompletion() Return whether this holder should be unbound at completion (or should rather be left bound to the thread after the transaction).
void	suspend() Suspend this synchronization.

Methods inherited from class java.lang.Object

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

Constructor Detail

ResourceHolderSynchronization

public ResourceHolderSynchronization(H resourceHolder,
                                     K resourceKey)

Create a new ResourceHolderSynchronization for the given holder.

Parameters:

resourceHolder - the ResourceHolder to manage

resourceKey - the key to bind the ResourceHolder for

See Also:

TransactionSynchronizationManager.bindResource(java.lang.Object, java.lang.Object)

Method Detail

suspend

public void suspend()

Description copied from interface: TransactionSynchronization

Suspend this synchronization. Supposed to unbind resources from TransactionSynchronizationManager if managing any.

Specified by:

suspend in interface TransactionSynchronization

See Also:

TransactionSynchronizationManager.unbindResource(java.lang.Object)

resume

public void resume()

Description copied from interface: TransactionSynchronization

Resume this synchronization. Supposed to rebind resources to TransactionSynchronizationManager if managing any.

Specified by:

resume in interface TransactionSynchronization

See Also:

TransactionSynchronizationManager.bindResource(java.lang.Object, java.lang.Object)

flush

public void flush()

Description copied from interface: TransactionSynchronization

Flush the underlying session to the datastore, if applicable: for example, a Hibernate/JPA session.

Specified by:

flush in interface java.io.Flushable

Specified by:

flush in interface TransactionSynchronization

See Also:

TransactionStatus.flush()

beforeCommit

public void beforeCommit(boolean readOnly)

Description copied from interface: TransactionSynchronization

Invoked before transaction commit (before "beforeCompletion"). Can e.g. flush transactional O/R Mapping sessions to the database.

This callback does not mean that the transaction will actually be committed. A rollback decision can still occur after this method has been called. This callback is rather meant to perform work that's only relevant if a commit still has a chance to happen, such as flushing SQL statements to the database.

Note that exceptions will get propagated to the commit caller and cause a rollback of the transaction.

Specified by:

beforeCommit in interface TransactionSynchronization

Parameters:

readOnly - whether the transaction is defined as read-only transaction

See Also:

TransactionSynchronization.beforeCompletion()

beforeCompletion

public void beforeCompletion()

Description copied from interface: TransactionSynchronization

Invoked before transaction commit/rollback. Can perform resource cleanup before transaction completion.

This method will be invoked after beforeCommit, even when beforeCommit threw an exception. This callback allows for closing resources before transaction completion, for any outcome.

Specified by:

beforeCompletion in interface TransactionSynchronization

See Also:

TransactionSynchronization.beforeCommit(boolean), TransactionSynchronization.afterCompletion(int)

afterCommit

public void afterCommit()

Description copied from interface: TransactionSynchronization

Invoked after transaction commit. Can perform further operations right after the main transaction has successfully committed.

Can e.g. commit further operations that are supposed to follow on a successful commit of the main transaction, like confirmation messages or emails.

NOTE: The transaction will have been committed already, but the transactional resources might still be active and accessible. As a consequence, any data access code triggered at this point will still "participate" in the original transaction, allowing to perform some cleanup (with no commit following anymore!), unless it explicitly declares that it needs to run in a separate transaction. Hence: Use PROPAGATION_REQUIRES_NEW for any transactional operation that is called from here.

Specified by:

afterCommit in interface TransactionSynchronization

afterCompletion

public void afterCompletion(int status)

Description copied from interface: TransactionSynchronization

Invoked after transaction commit/rollback. Can perform resource cleanup after transaction completion.

NOTE: The transaction will have been committed or rolled back already, but the transactional resources might still be active and accessible. As a consequence, any data access code triggered at this point will still "participate" in the original transaction, allowing to perform some cleanup (with no commit following anymore!), unless it explicitly declares that it needs to run in a separate transaction. Hence: Use PROPAGATION_REQUIRES_NEW for any transactional operation that is called from here.

Specified by:

afterCompletion in interface TransactionSynchronization

Parameters:

status - completion status according to the STATUS_* constants

See Also:

TransactionSynchronization.STATUS_COMMITTED, TransactionSynchronization.STATUS_ROLLED_BACK, TransactionSynchronization.STATUS_UNKNOWN, TransactionSynchronization.beforeCompletion()

shouldUnbindAtCompletion

protected boolean shouldUnbindAtCompletion()

Return whether this holder should be unbound at completion (or should rather be left bound to the thread after the transaction).

The default implementation returns true.

shouldReleaseBeforeCompletion

protected boolean shouldReleaseBeforeCompletion()

Return whether this holder's resource should be released before transaction completion (true) or rather after transaction completion (false).

Note that resources will only be released when they are unbound from the thread (shouldUnbindAtCompletion()).

The default implementation returns true.

See Also:

releaseResource(H, K)

shouldReleaseAfterCompletion

protected boolean shouldReleaseAfterCompletion(H resourceHolder)

Return whether this holder's resource should be released after transaction completion (true).

The default implementation returns !shouldReleaseBeforeCompletion(), releasing after completion if no attempt was made before completion.

See Also:

releaseResource(H, K)

flushResource

protected void flushResource(H resourceHolder)

Flush callback for the given resource holder.

Parameters:

resourceHolder - the resource holder to flush

processResourceAfterCommit

protected void processResourceAfterCommit(H resourceHolder)

After-commit callback for the given resource holder. Only called when the resource hasn't been released yet (shouldReleaseBeforeCompletion()).

Parameters:

resourceHolder - the resource holder to process

releaseResource

protected void releaseResource(H resourceHolder,
                               K resourceKey)

Release the given resource (after it has been unbound from the thread).

Parameters:

resourceHolder - the resource holder to process

resourceKey - the key that the ResourceHolder was bound for

cleanupResource

protected void cleanupResource(H resourceHolder,
                               K resourceKey,
                               boolean committed)

Perform a cleanup on the given resource (which is left bound to the thread).

Parameters:

resourceHolder - the resource holder to process

resourceKey - the key that the ResourceHolder was bound for

committed - whether the transaction has committed (true) or rolled back (false)