org.springframework.transaction.interceptor
Class AbstractFallbackTransactionAttributeSource

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

All Implemented Interfaces:

TransactionAttributeSource

Direct Known Subclasses:

AnnotationTransactionAttributeSource, AttributesTransactionAttributeSource

public abstract class AbstractFallbackTransactionAttributeSource
extends Object
implements TransactionAttributeSource

Abstract implementation of TransactionAttributeSource that caches attributes for methods and implements a fallback policy: 1. specific target method; 2. target class; 3. declaring method; 4. declaring class/interface.

Defaults to using the target class's transaction attribute if none is associated with the target method. Any transaction attribute associated with the target method completely overrides a class transaction attribute. If none found on the target class, the interface that the invoked method has been called through (in case of a JDK proxy) will be checked.

This implementation caches attributes by method after they are first used. If it is ever desirable to allow dynamic changing of transaction attributes (which is very unlikely), caching could be made configurable. Caching is desirable because of the cost of evaluating rollback rules.

Since:

1.1

Author:

Rod Johnson, Juergen Hoeller

Field Summary

(package private) Map	attributeCache Cache of TransactionAttributes, keyed by Method and target class.
protected Log	logger Logger available to subclasses.

Constructor Summary

AbstractFallbackTransactionAttributeSource()

Method Summary

protected abstract Collection	findAllAttributes(Class clazz) Subclasses should implement this to return all attributes for this class.
protected abstract Collection	findAllAttributes(Method method) Subclasses should implement this to return all attributes for this method.
protected TransactionAttribute	findTransactionAttribute(Collection atts) Return the transaction attribute, given this set of attributes attached to a method or class.
protected Object	getCacheKey(Method method, Class targetClass) Determine a cache key for the given method and target class.
TransactionAttribute	getTransactionAttribute(Method method, Class targetClass) Determine the transaction attribute for this method invocation.

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

Logger available to subclasses.

As this base class is not marked Serializable, the logger will be recreated after serialization - provided that the concrete subclass is Serializable.

attributeCache

final Map attributeCache

Cache of TransactionAttributes, keyed by Method and target class.

As this base class is not marked Serializable, the cache will be recreated after serialization - provided that the concrete subclass is Serializable.

Constructor Detail

AbstractFallbackTransactionAttributeSource

public AbstractFallbackTransactionAttributeSource()

Method Detail

getTransactionAttribute

public TransactionAttribute getTransactionAttribute(Method method,
                                                    Class targetClass)

Determine the transaction attribute for this method invocation.

Defaults to the class's transaction attribute if no method attribute is found.

Specified by:

getTransactionAttribute in interface TransactionAttributeSource

Parameters:

method - the method for the current invocation (never null)

targetClass - the target class for this invocation (may be null)

Returns:

TransactionAttribute for this method, or null if the method is not transactional

getCacheKey

protected Object getCacheKey(Method method,
                             Class targetClass)

Determine a cache key for the given method and target class.

Must not produce same key for overloaded methods. Must produce same key for different instances of the same method.

Parameters:

method - the method (never null)

targetClass - the target class (may be null)

Returns:

the cache key (never null)

findAllAttributes

protected abstract Collection findAllAttributes(Method method)

Subclasses should implement this to return all attributes for this method. We need all because of the need to analyze rollback rules.

Parameters:

method - the method to retrieve attributes for

Returns:

all attributes associated with this method (may be null)

findAllAttributes

protected abstract Collection findAllAttributes(Class clazz)

Subclasses should implement this to return all attributes for this class.

Parameters:

clazz - class to retrieve attributes for

Returns:

all attributes associated with this class (may be null)

findTransactionAttribute

protected TransactionAttribute findTransactionAttribute(Collection atts)

Return the transaction attribute, given this set of attributes attached to a method or class.

Protected rather than private as subclasses may want to customize how this is done: for example, returning a TransactionAttribute affected by the values of other attributes.

This implementation takes into account RollbackRuleAttributes, if the TransactionAttribute is a RuleBasedTransactionAttribute.

Parameters:

atts - attributes attached to a method or class (may be null)

Returns:

TransactionAttribute the corresponding transaction attribute, or null if none was found