org.springframework.aop.target
Class AbstractBeanFactoryBasedTargetSource

java.lang.Object
  org.springframework.aop.target.AbstractBeanFactoryBasedTargetSource

All Implemented Interfaces:

Serializable, TargetSource, BeanFactoryAware

Direct Known Subclasses:

AbstractPrototypeBasedTargetSource, LazyInitTargetSource

public abstract class AbstractBeanFactoryBasedTargetSource
extends Object
implements TargetSource, BeanFactoryAware, Serializable

Base class for TargetSource implementations that are based on a Spring BeanFactory, delegating to Spring-managed bean instances.

Subclasses can create prototype instances or lazily access a singleton target, for example. See LazyInitTargetSource and AbstractPrototypeBasedTargetSource's subclasses for concrete strategies.

BeanFactory-based TargetSources are serializable. This involves disconnecting the current target and turning into a SingletonTargetSource.

Since:

1.1.4

Author:

Juergen Hoeller, Rod Johnson

See Also:

BeanFactory.getBean(java.lang.String), LazyInitTargetSource, PrototypeTargetSource, ThreadLocalTargetSource, CommonsPoolTargetSource, Serialized Form

Field Summary

protected Log

logger Logger available to subclasses

Constructor Summary

AbstractBeanFactoryBasedTargetSource()

Method Summary

protected void	copyFrom(AbstractBeanFactoryBasedTargetSource other) Copy configuration from the other AbstractBeanFactoryBasedTargetSource object.
BeanFactory	getBeanFactory() Return the owning BeanFactory.
String	getTargetBeanName() Return the name of the target bean in the factory.
Class	getTargetClass() Return the type of targets returned by this TargetSource.
boolean	isStatic() Will all calls to TargetSource.getTarget() return the same object?
void	releaseTarget(Object target) Release the given target object obtained from the TargetSource.getTarget() method.
void	setBeanFactory(BeanFactory beanFactory) Set the owning BeanFactory.
void	setTargetBeanName(String targetBeanName) Set the name of the target bean in the factory.
void	setTargetClass(Class targetClass) Specify the target class explicitly, to avoid any kind of access to the target bean (for example, to avoid initialization of a FactoryBean instance).
protected Object	writeReplace() Replaces this object with a SingletonTargetSource on serialization.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.springframework.aop.TargetSource

getTarget

Field Detail

logger

protected final Log logger

Logger available to subclasses

Constructor Detail

AbstractBeanFactoryBasedTargetSource

public AbstractBeanFactoryBasedTargetSource()

Method Detail

setTargetBeanName

public void setTargetBeanName(String targetBeanName)

Set the name of the target bean in the factory. This bean should be a prototype, or the same instance will always be obtained from the factory, resulting in the same behavior as the SingletonTargetSource.

Parameters:

targetBeanName - name of the target bean in the BeanFactory that owns this interceptor

See Also:

SingletonTargetSource

getTargetBeanName

public String getTargetBeanName()

Return the name of the target bean in the factory.

setTargetClass

public void setTargetClass(Class targetClass)

Specify the target class explicitly, to avoid any kind of access to the target bean (for example, to avoid initialization of a FactoryBean instance).

Default is to detect the type automatically, through a getType call on the BeanFactory (or even a full getBean call as fallback).

setBeanFactory

public void setBeanFactory(BeanFactory beanFactory)
                    throws BeansException

Set the owning BeanFactory. We need to save a reference so that we can use the getBean method on every invocation.

Specified by:

setBeanFactory in interface BeanFactoryAware

Parameters:

beanFactory - owning BeanFactory (may not be null). The bean can immediately call methods on the factory.

Throws:

BeansException - in case of initialization errors

See Also:

BeanInitializationException

getBeanFactory

public BeanFactory getBeanFactory()

Return the owning BeanFactory.

getTargetClass

public Class getTargetClass()

Description copied from interface: TargetSource

Return the type of targets returned by this TargetSource.

Can return null, although certain usages of a TargetSource might just work with a predetermined target class.

Specified by:

getTargetClass in interface TargetSource

Returns:

the type of targets returned by this TargetSource

isStatic

public boolean isStatic()

Description copied from interface: TargetSource

Will all calls to TargetSource.getTarget() return the same object?

In that case, there will be no need to invoke TargetSource.releaseTarget(Object), and the AOP framework can cache the return value of TargetSource.getTarget().

Specified by:

isStatic in interface TargetSource

Returns:

true if the target is immutable

See Also:

TargetSource.getTarget()

releaseTarget

public void releaseTarget(Object target)
                   throws Exception

Description copied from interface: TargetSource

Release the given target object obtained from the TargetSource.getTarget() method.

Specified by:

releaseTarget in interface TargetSource

Parameters:

target - object obtained from a call to TargetSource.getTarget()

Throws:

Exception - if the object can't be released

copyFrom

protected void copyFrom(AbstractBeanFactoryBasedTargetSource other)

Copy configuration from the other AbstractBeanFactoryBasedTargetSource object. Subclasses should override this if they wish to expose it.

Parameters:

other - object to copy configuration from

writeReplace

protected Object writeReplace()
                       throws ObjectStreamException

Replaces this object with a SingletonTargetSource on serialization. Protected as otherwise it won't be invoked for subclasses. (The writeReplace() method must be visible to the class being serialized.)

With this implementation of this method, there is no need to mark non-serializable fields in this class or subclasses as transient.

Throws:

ObjectStreamException