org.springframework.transaction.interceptor

Class TransactionAspectSupport

java.lang.Object

org.springframework.transaction.interceptor.TransactionAspectSupport

All Implemented Interfaces:

Aware, BeanFactoryAware, InitializingBean

Direct Known Subclasses:

TransactionInterceptor

public abstract class TransactionAspectSupport
extends Object
implements BeanFactoryAware, InitializingBean

Base class for transactional aspects, such as the 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 its PlatformTransactionManager and TransactionAttributeSource are serializable.

Since:

1.1

Author:

Rod Johnson, Juergen Hoeller, Stéphane Nicoll, Sam Brannen

See Also:

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

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static interface	TransactionAspectSupport.InvocationCallback Simple callback interface for proceeding with the target invocation.
protected class	TransactionAspectSupport.TransactionInfo Opaque object used to hold Transaction information.

Field Summary

Fields

Modifier and Type	Field and Description
protected Log	logger

Constructor Summary

Constructors

Constructor and Description
TransactionAspectSupport()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Check that required properties were set.
protected void	cleanupTransactionInfo(TransactionAspectSupport.TransactionInfo txInfo) Reset the TransactionInfo ThreadLocal.
protected void	clearTransactionManagerCache() Clear the cache.
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(PlatformTransactionManager tm, 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.
protected PlatformTransactionManager	determineTransactionManager(TransactionAttribute txAttr) Determine the specific transaction manager to use for the given transaction.
protected BeanFactory	getBeanFactory() Return the BeanFactory to use for retrieving PlatformTransactionManager beans.
TransactionAttributeSource	getTransactionAttributeSource() Return the transaction attribute source.
PlatformTransactionManager	getTransactionManager() Return the default transaction manager, or null if unknown.
protected String	getTransactionManagerBeanName() Return the name of the default transaction manager bean.
protected Object	invokeWithinTransaction(Method method, Class<?> targetClass, TransactionAspectSupport.InvocationCallback invocation) General delegate for around-advice-based subclasses, delegating to several other template methods on this class.
protected String	methodIdentification(Method method, Class<?> targetClass) Convenience method to return a String representation of this Method for use in logging.
protected TransactionAspectSupport.TransactionInfo	prepareTransactionInfo(PlatformTransactionManager tm, TransactionAttribute txAttr, String joinpointIdentification, TransactionStatus status) Prepare a TransactionInfo for the given attribute and status object.
void	setBeanFactory(BeanFactory beanFactory) Set the BeanFactory to use for retrieving PlatformTransactionManager beans.
void	setTransactionAttributes(Properties transactionAttributes) Set properties with method names as keys and transaction attribute descriptors (parsed via TransactionAttributeEditor) as values: e.g.
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) Specify the default transaction manager to use to drive transactions.
void	setTransactionManagerBeanName(String transactionManagerBeanName) Specify the name of the default transaction manager bean.

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()

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

setTransactionManagerBeanName

public void setTransactionManagerBeanName(String transactionManagerBeanName)

Specify the name of the default transaction manager bean.

getTransactionManagerBeanName

protected final String getTransactionManagerBeanName()

Return the name of the default transaction manager bean.

setTransactionManager

public void setTransactionManager(PlatformTransactionManager transactionManager)

Specify the default transaction manager to use to drive transactions.

The default transaction manager will be used if a qualifier has not been declared for a given transaction or if an explicit name for the default transaction manager bean has not been specified.

See Also:

setTransactionManagerBeanName(java.lang.String)

getTransactionManager

public PlatformTransactionManager getTransactionManager()

Return the default transaction manager, or null if unknown.

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

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, AnnotationTransactionAttributeSource

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, AnnotationTransactionAttributeSource

getTransactionAttributeSource

public TransactionAttributeSource getTransactionAttributeSource()

Return the transaction attribute source.

setBeanFactory

public void setBeanFactory(BeanFactory beanFactory)

Set the BeanFactory to use for retrieving PlatformTransactionManager beans.

Specified by:

setBeanFactory in interface BeanFactoryAware

Parameters:

beanFactory - owning BeanFactory (never null). The bean can immediately call methods on the factory.

See Also:

BeanInitializationException

getBeanFactory

protected final BeanFactory getBeanFactory()

Return the BeanFactory to use for retrieving PlatformTransactionManager beans.

afterPropertiesSet

public void afterPropertiesSet()

Check that required properties were set.

Specified by:

afterPropertiesSet in interface InitializingBean

invokeWithinTransaction

protected Object invokeWithinTransaction(Method method,
                                         Class<?> targetClass,
                                         TransactionAspectSupport.InvocationCallback invocation)
                                  throws Throwable

General delegate for around-advice-based subclasses, delegating to several other template methods on this class. Able to handle CallbackPreferringPlatformTransactionManager as well as regular PlatformTransactionManager implementations.

Parameters:

method - the Method being invoked

targetClass - the target class that we're invoking the method on

invocation - the callback to use for proceeding with the target invocation

Returns:

the return value of the method, if any

Throws:

Throwable - propagated from the target invocation

clearTransactionManagerCache

protected void clearTransactionManagerCache()

Clear the cache.

determineTransactionManager

protected PlatformTransactionManager determineTransactionManager(TransactionAttribute txAttr)

Determine the specific transaction manager to use for the given transaction.

methodIdentification

protected String methodIdentification(Method method,
                                      Class<?> targetClass)

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.

The default implementation returns null, indicating the use of DefaultTransactionAttribute.getDescriptor() instead, ending up as ClassUtils.getQualifiedMethodName(Method, Class).

Parameters:

method - the method we're interested in

targetClass - the class that the method is being invoked on

Returns:

a String representation identifying this method

See Also:

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

createTransactionIfNecessary

protected TransactionAspectSupport.TransactionInfo createTransactionIfNecessary(PlatformTransactionManager tm,
                                                                                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()

prepareTransactionInfo

protected TransactionAspectSupport.TransactionInfo prepareTransactionInfo(PlatformTransactionManager tm,
                                                                          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

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

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

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)