org.springframework.aop.target
Class HotSwappableTargetSource

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

All Implemented Interfaces:

Serializable, TargetSource

public class HotSwappableTargetSource
extends Object
implements TargetSource, Serializable

Implementation of TargetSource interface that caches a local target object, but allows the target to be swapped while the application is running.

If configuring an object of this class in a Spring IoC container, use constructor injection.

This TargetSource is serializable if the target is at the time of serialization.

Author:

Rod Johnson

See Also:

Serialized Form

Constructor Summary

HotSwappableTargetSource(Object initialTarget)
Create a new HotSwappableTargetSource with the given initial target object.

Method Summary

boolean	equals(Object other) Two HotSwappableTargetSources are equal if the targets are equal.
Object	getTarget() Return a target instance.
Class	getTargetClass() Return the type of targets returned by this TargetSource.
int	hashCode()
boolean	isStatic() Not static.
void	releaseTarget(Object target) No need to release target.
Object	swap(Object newTarget) Swap the target, returning the old target.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

HotSwappableTargetSource

public HotSwappableTargetSource(Object initialTarget)

Create a new HotSwappableTargetSource with the given initial target object.

Parameters:

initialTarget - the initial target object

Method Detail

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 final boolean isStatic()

Not static.

Specified by:

isStatic in interface TargetSource

Returns:

true if the target is immutable

See Also:

TargetSource.getTarget()

getTarget

public Object getTarget()

Description copied from interface: TargetSource

Return a target instance. Invoked immediately before the AOP framework calls the "target" of an AOP method invocation.

Specified by:

getTarget in interface TargetSource

Returns:

the target object, which contains the joinpoint

releaseTarget

public void releaseTarget(Object target)

No need to release target.

Specified by:

releaseTarget in interface TargetSource

Parameters:

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

swap

public Object swap(Object newTarget)
            throws IllegalArgumentException

Swap the target, returning the old target.

Parameters:

newTarget - the new target object

Returns:

the old target object

Throws:

IllegalArgumentException - if the new target is invalid

equals

public boolean equals(Object other)

Two HotSwappableTargetSources are equal if the targets are equal.

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object