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

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org.springframework.jms.connection
Class JmsTransactionManager

java.lang.Object
  org.springframework.transaction.support.AbstractPlatformTransactionManager
      org.springframework.jms.connection.JmsTransactionManager

All Implemented Interfaces:

Serializable, InitializingBean, PlatformTransactionManager, ResourceTransactionManager

Direct Known Subclasses:

JmsTransactionManager102

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public class JmsTransactionManager
extends AbstractPlatformTransactionManager
implements ResourceTransactionManager, InitializingBean

PlatformTransactionManager implementation for a single JMS ConnectionFactory. Binds a JMS Connection/Session pair from the specified ConnectionFactory to the thread, potentially allowing for one thread-bound Session per ConnectionFactory.

This local strategy is an alternative to executing JMS operations within JTA transactions. Its advantage is that it is able to work in any environment, for example a standalone application or a test suite, with any message broker as target. However, this strategy is not able to provide XA transactions, for example in order to share transactions between messaging and database access. A full JTA/XA setup is required for XA transactions, typically using Spring's JtaTransactionManager as strategy.

Application code is required to retrieve the transactional JMS Session via ConnectionFactoryUtils.getTransactionalSession(javax.jms.ConnectionFactory, javax.jms.Connection, boolean) instead of a standard J2EE-style ConnectionFactory.createConnection() call with subsequent Session creation. Spring's JmsTemplate will autodetect a thread-bound Session and automatically participate in it.

Alternatively, you can allow application code to work with the standard J2EE-style lookup pattern on a ConnectionFactory, for example for legacy code that is not aware of Spring at all. In that case, define a TransactionAwareConnectionFactoryProxy for your target ConnectionFactory, which will automatically participate in Spring-managed transactions.

This transaction strategy will typically be used in combination with SingleConnectionFactory, which uses a single JMS Connection for all JMS access in order to avoid the overhead of repeated Connection creation, typically in a standalone application. Each transaction will then share the same JMS Connection, while still using its own individual JMS Session.

Transaction synchronization is turned off by default, as this manager might be used alongside a datastore-based Spring transaction manager such as the JDBC DataSourceTransactionManager, which has stronger needs for synchronization.

Since:

1.1

Author:

Juergen Hoeller

See Also:

ConnectionFactoryUtils.getTransactionalSession(javax.jms.ConnectionFactory, javax.jms.Connection, boolean), TransactionAwareConnectionFactoryProxy, JmsTemplate, Serialized Form

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Nested Class Summary

 

Nested classes/interfaces inherited from class org.springframework.transaction.support.AbstractPlatformTransactionManager
AbstractPlatformTransactionManager.SuspendedResourcesHolder

 

Field Summary

 

Fields inherited from class org.springframework.transaction.support.AbstractPlatformTransactionManager
logger, SYNCHRONIZATION_ALWAYS, SYNCHRONIZATION_NEVER, SYNCHRONIZATION_ON_ACTUAL_TRANSACTION

 

Constructor Summary
JmsTransactionManager()           Create a new JmsTransactionManager for bean-style usage.
JmsTransactionManager(ConnectionFactory connectionFactory)           Create a new JmsTransactionManager, given a ConnectionFactory.

 

Method Summary
void	afterPropertiesSet()           Make sure the ConnectionFactory has been set.
protected  Connection	createConnection()           Create a JMS Connection via this template's ConnectionFactory.
protected  Session	createSession(Connection con)           Create a JMS Session for the given Connection.
protected  void	doBegin(Object transaction, TransactionDefinition definition)           Begin a new transaction with semantics according to the given transaction definition.
protected  void	doCleanupAfterCompletion(Object transaction)           Cleanup resources after transaction completion.
protected  void	doCommit(DefaultTransactionStatus status)           Perform an actual commit of the given transaction.
protected  Object	doGetTransaction()           Return a transaction object for the current transaction state.
protected  void	doResume(Object transaction, Object suspendedResources)           Resume the resources of the current transaction.
protected  void	doRollback(DefaultTransactionStatus status)           Perform an actual rollback of the given transaction.
protected  void	doSetRollbackOnly(DefaultTransactionStatus status)           Set the given transaction rollback-only.
protected  Object	doSuspend(Object transaction)           Suspend the resources of the current transaction.
ConnectionFactory	getConnectionFactory()           Return the JMS ConnectionFactory that this instance should manage transactions for.
Object	getResourceFactory()           Return the resource factory that this transaction manager operates on, e.g. a JDBC DataSource or a JMS ConnectionFactory.
protected  boolean	isExistingTransaction(Object transaction)           Check if the given transaction object indicates an existing transaction (that is, a transaction which has already started).
void	setConnectionFactory(ConnectionFactory cf)           Set the JMS ConnectionFactory that this instance should manage transactions for.

 

Methods inherited from class org.springframework.transaction.support.AbstractPlatformTransactionManager

commit, determineTimeout, getDefaultTimeout, getTransaction, getTransactionSynchronization, invokeAfterCompletion, isFailEarlyOnGlobalRollbackOnly, isGlobalRollbackOnParticipationFailure, isNestedTransactionAllowed, isRollbackOnCommitFailure, newTransactionStatus, registerAfterCompletionWithExistingTransaction, resume, rollback, setDefaultTimeout, setFailEarlyOnGlobalRollbackOnly, setGlobalRollbackOnParticipationFailure, setNestedTransactionAllowed, setRollbackOnCommitFailure, setTransactionSynchronization, setTransactionSynchronizationName, shouldCommitOnGlobalRollbackOnly, suspend, triggerBeforeCommit, triggerBeforeCompletion, useSavepointForNestedTransaction

 

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

 

Methods inherited from interface org.springframework.transaction.PlatformTransactionManager
commit, getTransaction, rollback

 

Constructor Detail

JmsTransactionManager

public JmsTransactionManager()

Create a new JmsTransactionManager for bean-style usage.

Note: The ConnectionFactory has to be set before using the instance. This constructor can be used to prepare a JmsTemplate via a BeanFactory, typically setting the ConnectionFactory via setConnectionFactory.

Turns off transaction synchronization by default, as this manager might be used alongside a datastore-based Spring transaction manager like DataSourceTransactionManager, which has stronger needs for synchronization. Only one manager is allowed to drive synchronization at any point of time.

See Also:

setConnectionFactory(javax.jms.ConnectionFactory), AbstractPlatformTransactionManager.setTransactionSynchronization(int)

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JmsTransactionManager

public JmsTransactionManager(ConnectionFactory connectionFactory)

Create a new JmsTransactionManager, given a ConnectionFactory.

Parameters:

connectionFactory - the ConnectionFactory to obtain connections from

Method Detail

setConnectionFactory

public void setConnectionFactory(ConnectionFactory cf)

Set the JMS ConnectionFactory that this instance should manage transactions for.

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getConnectionFactory

public ConnectionFactory getConnectionFactory()

Return the JMS ConnectionFactory that this instance should manage transactions for.

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afterPropertiesSet

public void afterPropertiesSet()

Make sure the ConnectionFactory has been set.

Specified by:

afterPropertiesSet in interface InitializingBean

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getResourceFactory

public Object getResourceFactory()

Description copied from interface: ResourceTransactionManager

Return the resource factory that this transaction manager operates on, e.g. a JDBC DataSource or a JMS ConnectionFactory.

This target resource factory is usually used as resource key for TransactionSynchronizationManager's resource bindings per thread.

Specified by:

getResourceFactory in interface ResourceTransactionManager

Returns:

the target resource factory (never null)

See Also:

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

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doGetTransaction

protected Object doGetTransaction()

Description copied from class: AbstractPlatformTransactionManager

Return a transaction object for the current transaction state.

The returned object will usually be specific to the concrete transaction manager implementation, carrying corresponding transaction state in a modifiable fashion. This object will be passed into the other template methods (e.g. doBegin and doCommit), either directly or as part of a DefaultTransactionStatus instance.

The returned object should contain information about any existing transaction, that is, a transaction that has already started before the current getTransaction call on the transaction manager. Consequently, a doGetTransaction implementation will usually look for an existing transaction and store corresponding state in the returned transaction object.

Specified by:

doGetTransaction in class AbstractPlatformTransactionManager

Returns:

the current transaction object

See Also:

AbstractPlatformTransactionManager.doBegin(java.lang.Object, org.springframework.transaction.TransactionDefinition), AbstractPlatformTransactionManager.doCommit(org.springframework.transaction.support.DefaultTransactionStatus), AbstractPlatformTransactionManager.doRollback(org.springframework.transaction.support.DefaultTransactionStatus), DefaultTransactionStatus.getTransaction()

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isExistingTransaction

protected boolean isExistingTransaction(Object transaction)

Description copied from class: AbstractPlatformTransactionManager

Check if the given transaction object indicates an existing transaction (that is, a transaction which has already started).

The result will be evaluated according to the specified propagation behavior for the new transaction. An existing transaction might get suspended (in case of PROPAGATION_REQUIRES_NEW), or the new transaction might participate in the existing one (in case of PROPAGATION_REQUIRED).

The default implementation returns false, assuming that participating in existing transactions is generally not supported. Subclasses are of course encouraged to provide such support.

Overrides:

isExistingTransaction in class AbstractPlatformTransactionManager

Parameters:

transaction - transaction object returned by doGetTransaction

Returns:

if there is an existing transaction

See Also:

AbstractPlatformTransactionManager.doGetTransaction()

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doBegin

protected void doBegin(Object transaction,
                       TransactionDefinition definition)

Description copied from class: AbstractPlatformTransactionManager

Begin a new transaction with semantics according to the given transaction definition. Does not have to care about applying the propagation behavior, as this has already been handled by this abstract manager.

This method gets called when the transaction manager has decided to actually start a new transaction. Either there wasn't any transaction before, or the previous transaction has been suspended.

A special scenario is a nested transaction without savepoint: If useSavepointForNestedTransaction() returns "false", this method will be called to start a nested transaction when necessary. In such a context, there will be an active transaction: The implementation of this method has to detect this and start an appropriate nested transaction.

Specified by:

doBegin in class AbstractPlatformTransactionManager

Parameters:

transaction - transaction object returned by doGetTransaction

definition - TransactionDefinition instance, describing propagation behavior, isolation level, read-only flag, timeout, and transaction name

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doSuspend

protected Object doSuspend(Object transaction)

Description copied from class: AbstractPlatformTransactionManager

Suspend the resources of the current transaction. Transaction synchronization will already have been suspended.

The default implementation throws a TransactionSuspensionNotSupportedException, assuming that transaction suspension is generally not supported.

Overrides:

doSuspend in class AbstractPlatformTransactionManager

Parameters:

transaction - transaction object returned by doGetTransaction

Returns:

an object that holds suspended resources (will be kept unexamined for passing it into doResume)

See Also:

AbstractPlatformTransactionManager.doResume(java.lang.Object, java.lang.Object)

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doResume

protected void doResume(Object transaction,
                        Object suspendedResources)

Description copied from class: AbstractPlatformTransactionManager

Resume the resources of the current transaction. Transaction synchronization will be resumed afterwards.

The default implementation throws a TransactionSuspensionNotSupportedException, assuming that transaction suspension is generally not supported.

Overrides:

doResume in class AbstractPlatformTransactionManager

Parameters:

transaction - transaction object returned by doGetTransaction

suspendedResources - the object that holds suspended resources, as returned by doSuspend

See Also:

AbstractPlatformTransactionManager.doSuspend(java.lang.Object)

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doCommit

protected void doCommit(DefaultTransactionStatus status)

Description copied from class: AbstractPlatformTransactionManager

Perform an actual commit of the given transaction.

An implementation does not need to check the "new transaction" flag or the rollback-only flag; this will already have been handled before. Usually, a straight commit will be performed on the transaction object contained in the passed-in status.

Specified by:

doCommit in class AbstractPlatformTransactionManager

Parameters:

status - the status representation of the transaction

See Also:

DefaultTransactionStatus.getTransaction()

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doRollback

protected void doRollback(DefaultTransactionStatus status)

Description copied from class: AbstractPlatformTransactionManager

Perform an actual rollback of the given transaction.

An implementation does not need to check the "new transaction" flag; this will already have been handled before. Usually, a straight rollback will be performed on the transaction object contained in the passed-in status.

Specified by:

doRollback in class AbstractPlatformTransactionManager

Parameters:

status - the status representation of the transaction

See Also:

DefaultTransactionStatus.getTransaction()

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doSetRollbackOnly

protected void doSetRollbackOnly(DefaultTransactionStatus status)

Description copied from class: AbstractPlatformTransactionManager

Set the given transaction rollback-only. Only called on rollback if the current transaction participates in an existing one.

The default implementation throws an IllegalTransactionStateException, assuming that participating in existing transactions is generally not supported. Subclasses are of course encouraged to provide such support.

Overrides:

doSetRollbackOnly in class AbstractPlatformTransactionManager

Parameters:

status - the status representation of the transaction

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doCleanupAfterCompletion

protected void doCleanupAfterCompletion(Object transaction)

Description copied from class: AbstractPlatformTransactionManager

Cleanup resources after transaction completion.

Called after doCommit and doRollback execution, on any outcome. The default implementation does nothing.

Should not throw any exceptions but just issue warnings on errors.

Overrides:

doCleanupAfterCompletion in class AbstractPlatformTransactionManager

Parameters:

transaction - transaction object returned by doGetTransaction

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createConnection

protected Connection createConnection()
                               throws JMSException

Create a JMS Connection via this template's ConnectionFactory.

This implementation uses JMS 1.1 API.

Returns:

the new JMS Connection

Throws:

JMSException - if thrown by JMS API methods

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createSession

protected Session createSession(Connection con)
                         throws JMSException

Create a JMS Session for the given Connection.

This implementation uses JMS 1.1 API.

Parameters:

con - the JMS Connection to create a Session for

Returns:

the new JMS Session

Throws:

JMSException - if thrown by JMS API methods

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