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

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org.springframework.jdbc.support.lob
Class SpringLobCreatorSynchronization

java.lang.Object
  org.springframework.transaction.support.TransactionSynchronizationAdapter
      org.springframework.jdbc.support.lob.SpringLobCreatorSynchronization

All Implemented Interfaces:

Ordered, TransactionSynchronization

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public class SpringLobCreatorSynchronization
extends TransactionSynchronizationAdapter

Callback for resource cleanup at the end of a Spring transaction. Invokes LobCreator.close() to clean up temporary LOBs that might have been created.

Since:

2.0

Author:

Juergen Hoeller

See Also:

LobCreator.close()

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Field Summary
static int	LOB_CREATOR_SYNCHRONIZATION_ORDER           Order value for TransactionSynchronization objects that clean up LobCreators.

 

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
SpringLobCreatorSynchronization(LobCreator lobCreator)           Create a SpringLobCreatorSynchronization for the given LobCreator.

 

Method Summary
void	afterCompletion(int status)           Invoked after transaction commit/rollback.
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.

 

Methods inherited from class org.springframework.transaction.support.TransactionSynchronizationAdapter
afterCommit, beforeCommit, resume, suspend

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

LOB_CREATOR_SYNCHRONIZATION_ORDER

public static final int LOB_CREATOR_SYNCHRONIZATION_ORDER

Order value for TransactionSynchronization objects that clean up LobCreators. Return CONNECTION_SYNCHRONIZATION_ORDER - 200 to execute LobCreator cleanup before Hibernate Session (- 100) and JDBC Connection cleanup, if any.

See Also:

DataSourceUtils.CONNECTION_SYNCHRONIZATION_ORDER, Constant Field Values

Constructor Detail

SpringLobCreatorSynchronization

public SpringLobCreatorSynchronization(LobCreator lobCreator)

Create a SpringLobCreatorSynchronization for the given LobCreator.

Parameters:

lobCreator - the LobCreator to close after transaction completion

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

Overrides:

getOrder in class TransactionSynchronizationAdapter

Returns:

the order value

See Also:

Ordered.LOWEST_PRECEDENCE

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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

Overrides:

beforeCompletion in class TransactionSynchronizationAdapter

See Also:

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

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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

Overrides:

afterCompletion in class TransactionSynchronizationAdapter

Parameters:

status - completion status according to the STATUS_* constants

See Also:

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

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