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

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org.springframework.transaction.interceptor
Class TransactionAspectSupport

java.lang.Object
  org.springframework.transaction.interceptor.TransactionAspectSupport

All Implemented Interfaces:

InitializingBean

Direct Known Subclasses:

TransactionInterceptor

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public abstract class TransactionAspectSupport
extends Object
implements InitializingBean

Superclass for transactional aspects, such as the AOP Alliance-compatible TransactionInterceptor, or an AspectJ aspect.

This enables the underlying Spring transaction infrastructure to be used easily to implement an aspect for any aspect system.

Subclasses are responsible for calling methods in this class in the correct order.

If no transaction name has been specified in the TransactionAttribute, the exposed name will be the fully-qualified class name + "." + method name (by default).

Uses the Strategy design pattern. A PlatformTransactionManager implementation will perform the actual transaction management, and a TransactionAttributeSource is used for determining transaction definitions.

A transaction aspect is serializable if it's PlatformTransactionManager and TransactionAttributeSource are serializable.

Since:

1.1

Author:

Rod Johnson, Juergen Hoeller

See Also:

setTransactionManager(org.springframework.transaction.PlatformTransactionManager), setTransactionAttributes(java.util.Properties), setTransactionAttributeSource(org.springframework.transaction.interceptor.TransactionAttributeSource)

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Nested Class Summary
protected  class	TransactionAspectSupport.TransactionInfo           Opaque object used to hold Transaction information.

 

Field Summary
protected  Log	logger

 

Constructor Summary
TransactionAspectSupport()

 

Method Summary
void	afterPropertiesSet()           Check that required properties were set.
protected  void	cleanupTransactionInfo(TransactionAspectSupport.TransactionInfo txInfo)           Reset the TransactionInfo ThreadLocal.
protected  void	commitTransactionAfterReturning(TransactionAspectSupport.TransactionInfo txInfo)           Execute after successful completion of call, but not after an exception was handled.
protected  void	completeTransactionAfterThrowing(TransactionAspectSupport.TransactionInfo txInfo, Throwable ex)           Handle a throwable, completing the transaction.
protected  TransactionAspectSupport.TransactionInfo	createTransactionIfNecessary(Method method, Class targetClass)           Create a transaction if necessary, based on the given method and class.
protected  TransactionAspectSupport.TransactionInfo	createTransactionIfNecessary(TransactionAttribute txAttr, String joinpointIdentification)           Create a transaction if necessary based on the given TransactionAttribute.
protected static TransactionAspectSupport.TransactionInfo	currentTransactionInfo()           Subclasses can use this to return the current TransactionInfo.
static TransactionStatus	currentTransactionStatus()           Return the transaction status of the current method invocation.
TransactionAttributeSource	getTransactionAttributeSource()           Return the transaction attribute source.
PlatformTransactionManager	getTransactionManager()           Return the transaction manager.
protected  String	methodIdentification(Method method)           Convenience method to return a String representation of this Method for use in logging.
protected  TransactionAspectSupport.TransactionInfo	prepareTransactionInfo(TransactionAttribute txAttr, String joinpointIdentification, TransactionStatus status)           Prepare a TransactionInfo for the given attribute and status object.
void	setTransactionAttributes(Properties transactionAttributes)           Set properties with method names as keys and transaction attribute descriptors (parsed via TransactionAttributeEditor) as values: e.g. key = "myMethod", value = "PROPAGATION_REQUIRED,readOnly".
void	setTransactionAttributeSource(TransactionAttributeSource transactionAttributeSource)           Set the transaction attribute source which is used to find transaction attributes.
void	setTransactionAttributeSources(TransactionAttributeSource[] transactionAttributeSources)           Set multiple transaction attribute sources which are used to find transaction attributes.
void	setTransactionManager(PlatformTransactionManager transactionManager)           Set the transaction manager.

 

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

 

Field Detail

logger

protected final Log logger

Constructor Detail

TransactionAspectSupport

public TransactionAspectSupport()

Method Detail

currentTransactionInfo

protected static TransactionAspectSupport.TransactionInfo currentTransactionInfo()
                                                                          throws NoTransactionException

Subclasses can use this to return the current TransactionInfo. Only subclasses that cannot handle all operations in one method, such as an AspectJ aspect involving distinct before and after advice, need to use this mechanism to get at the current TransactionInfo. An around advice such as an AOP Alliance MethodInterceptor can hold a reference to the TransactionInfo throughout the aspect method.

A TransactionInfo will be returned even if no transaction was created. The TransactionInfo.hasTransaction() method can be used to query this.

To find out about specific transaction characteristics, consider using TransactionSynchronizationManager's isSynchronizationActive() and/or isActualTransactionActive() methods.

Returns:

TransactionInfo bound to this thread, or null if none

Throws:

NoTransactionException

See Also:

TransactionAspectSupport.TransactionInfo.hasTransaction(), TransactionSynchronizationManager.isSynchronizationActive(), TransactionSynchronizationManager.isActualTransactionActive()

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currentTransactionStatus

public static TransactionStatus currentTransactionStatus()
                                                  throws NoTransactionException

Return the transaction status of the current method invocation. Mainly intended for code that wants to set the current transaction rollback-only but not throw an application exception.

Throws:

NoTransactionException - if the transaction info cannot be found, because the method was invoked outside an AOP invocation context

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setTransactionManager

public void setTransactionManager(PlatformTransactionManager transactionManager)

Set the transaction manager. This will perform actual transaction management: This class is just a way of invoking it.

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getTransactionManager

public PlatformTransactionManager getTransactionManager()

Return the transaction manager.

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setTransactionAttributes

public void setTransactionAttributes(Properties transactionAttributes)

Set properties with method names as keys and transaction attribute descriptors (parsed via TransactionAttributeEditor) as values: e.g. key = "myMethod", value = "PROPAGATION_REQUIRED,readOnly".

Note: Method names are always applied to the target class, no matter if defined in an interface or the class itself.

Internally, a NameMatchTransactionAttributeSource will be created from the given properties.

See Also:

setTransactionAttributeSource(org.springframework.transaction.interceptor.TransactionAttributeSource), TransactionAttributeEditor, NameMatchTransactionAttributeSource

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setTransactionAttributeSources

public void setTransactionAttributeSources(TransactionAttributeSource[] transactionAttributeSources)

Set multiple transaction attribute sources which are used to find transaction attributes. Will build a CompositeTransactionAttributeSource for the given sources.

See Also:

CompositeTransactionAttributeSource, MethodMapTransactionAttributeSource, NameMatchTransactionAttributeSource, AttributesTransactionAttributeSource, AnnotationTransactionAttributeSource

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setTransactionAttributeSource

public void setTransactionAttributeSource(TransactionAttributeSource transactionAttributeSource)

Set the transaction attribute source which is used to find transaction attributes. If specifying a String property value, a PropertyEditor will create a MethodMapTransactionAttributeSource from the value.

See Also:

TransactionAttributeSourceEditor, MethodMapTransactionAttributeSource, NameMatchTransactionAttributeSource, AttributesTransactionAttributeSource, AnnotationTransactionAttributeSource

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getTransactionAttributeSource

public TransactionAttributeSource getTransactionAttributeSource()

Return the transaction attribute source.

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afterPropertiesSet

public void afterPropertiesSet()

Check that required properties were set.

Specified by:

afterPropertiesSet in interface InitializingBean

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createTransactionIfNecessary

protected TransactionAspectSupport.TransactionInfo createTransactionIfNecessary(Method method,
                                                                                Class targetClass)

Create a transaction if necessary, based on the given method and class.

Performs a default TransactionAttribute lookup for the given method.

Parameters:

method - method about to execute

targetClass - class the method is on

Returns:

a TransactionInfo object, whether or not a transaction was created. The hasTransaction() method on TransactionInfo can be used to tell if there was a transaction created.

See Also:

getTransactionAttributeSource()

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methodIdentification

protected String methodIdentification(Method method)

Convenience method to return a String representation of this Method for use in logging. Can be overridden in subclasses to provide a different identifier for the given method.

Parameters:

method - the method we're interested in

Returns:

log message identifying this method

See Also:

ClassUtils.getQualifiedMethodName(java.lang.reflect.Method)

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createTransactionIfNecessary

protected TransactionAspectSupport.TransactionInfo createTransactionIfNecessary(TransactionAttribute txAttr,
                                                                                String joinpointIdentification)

Create a transaction if necessary based on the given TransactionAttribute.

Allows callers to perform custom TransactionAttribute lookups through the TransactionAttributeSource.

Parameters:

txAttr - the TransactionAttribute (may be null)

joinpointIdentification - the fully qualified method name (used for monitoring and logging purposes)

Returns:

a TransactionInfo object, whether or not a transaction was created. The hasTransaction() method on TransactionInfo can be used to tell if there was a transaction created.

See Also:

getTransactionAttributeSource()

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prepareTransactionInfo

protected TransactionAspectSupport.TransactionInfo prepareTransactionInfo(TransactionAttribute txAttr,
                                                                          String joinpointIdentification,
                                                                          TransactionStatus status)

Prepare a TransactionInfo for the given attribute and status object.

Parameters:

txAttr - the TransactionAttribute (may be null)

joinpointIdentification - the fully qualified method name (used for monitoring and logging purposes)

status - the TransactionStatus for the current transaction

Returns:

the prepared TransactionInfo object

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commitTransactionAfterReturning

protected void commitTransactionAfterReturning(TransactionAspectSupport.TransactionInfo txInfo)

Execute after successful completion of call, but not after an exception was handled. Do nothing if we didn't create a transaction.

Parameters:

txInfo - information about the current transaction

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completeTransactionAfterThrowing

protected void completeTransactionAfterThrowing(TransactionAspectSupport.TransactionInfo txInfo,
                                                Throwable ex)

Handle a throwable, completing the transaction. We may commit or roll back, depending on the configuration.

Parameters:

txInfo - information about the current transaction

ex - throwable encountered

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cleanupTransactionInfo

protected void cleanupTransactionInfo(TransactionAspectSupport.TransactionInfo txInfo)

Reset the TransactionInfo ThreadLocal.

Call this in all cases: exception or normal return!

Parameters:

txInfo - information about the current transaction (may be null)

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