TransactionSynchronizationAdapter (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.transaction.support
Class TransactionSynchronizationAdapter

java.lang.Object
  org.springframework.transaction.support.TransactionSynchronizationAdapter

All Implemented Interfaces:: Ordered, TransactionSynchronization

Direct Known Subclasses:: SpringLobCreatorSynchronization

public abstract class TransactionSynchronizationAdapter
extends Object
implements TransactionSynchronization, Ordered
extends Object
implements TransactionSynchronization, Ordered

Simple TransactionSynchronization adapter containing empty method implementations, for easier overriding of single methods.

Also implements the Ordered interface to enable the execution order of synchronizations to be controlled declaratively. The default order is Ordered.LOWEST_PRECEDENCE, indicating late execution; return a lower value for earlier execution.

Since:: 22.01.2004
Author:: Juergen Hoeller

Field Summary

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

STATUS_COMMITTED, STATUS_ROLLED_BACK, STATUS_UNKNOWN

Fields inherited from interface org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

Constructor Summary

TransactionSynchronizationAdapter()


Method Summary

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.

int getOrder()
          Return the order value of this object, with a higher value meaning greater in terms of sorting.

void resume()
          Resume this synchronization.

void suspend()
          Suspend this synchronization.

Methods inherited from class java.lang.Object

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

Fields inherited from interface org.springframework.transaction.support.TransactionSynchronization
`STATUS_COMMITTED, STATUS_ROLLED_BACK, STATUS_UNKNOWN`

Fields inherited from interface org.springframework.core.Ordered
`HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE`

Constructor Summary
`TransactionSynchronizationAdapter()`

Method Summary
`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.
`int`	`getOrder()` Return the order value of this object, with a higher value meaning greater in terms of sorting.
`void`	`resume()` Resume this synchronization.
`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

TransactionSynchronizationAdapter

public TransactionSynchronizationAdapter()

Method Detail

getOrder

public int getOrder()

Description copied from interface: Ordered

Return the order value of this object, with a higher value meaning greater in terms of sorting.

Normally starting with 0 or 1, with Ordered.LOWEST_PRECEDENCE indicating greatest. Same order values will result in arbitrary positions for the affected objects.

Higher value can be interpreted as lower priority, consequently the first object has highest priority (somewhat analogous to Servlet "load-on-startup" values).

Note that order values below 0 are reserved for framework purposes. Application-specified values should always be 0 or greater, with only framework components (internal or third-party) supposed to use lower values.

Specified by:: getOrder in interface Ordered

Returns:: the order value
See Also:: Ordered.LOWEST_PRECEDENCE

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)

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.