Package org.springframework.aop.target

Class SingletonTargetSource

java.lang.Object

org.springframework.aop.target.SingletonTargetSource

All Implemented Interfaces:

Serializable, TargetClassAware, TargetSource

public class SingletonTargetSource
extends Object
implements TargetSource, Serializable

Implementation of the TargetSource interface that holds a given object. This is the default implementation of the TargetSource interface, as used by the Spring AOP framework. There is usually no need to create objects of this class in application code.

This class is serializable. However, the actual serializability of a SingletonTargetSource will depend on whether the target is serializable.

Author:

Rod Johnson, Juergen Hoeller

See Also:

• AdvisedSupport.setTarget(Object)
• Serialized Form

Constructor Summary

Constructors

Constructor	Description
SingletonTargetSource(Object target)	Create a new SingletonTargetSource for the given target.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object other)	Two invoker interceptors are equal if they have the same target or if the targets or the targets are equal.
Object	getTarget()	Return a target instance.
Class<?>	getTargetClass()	Return the type of targets returned by this TargetSource.
int	hashCode()	SingletonTargetSource uses the hash code of the target object.
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, if any.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

SingletonTargetSource

public SingletonTargetSource(Object target)

Create a new SingletonTargetSource for the given target.

Parameters:

target - the target object

Method Details

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 TargetClassAware

Specified by:

getTargetClass in interface TargetSource

Returns:

the type of targets returned by this TargetSource

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, or null if there is no actual target instance

releaseTarget

public void releaseTarget(Object target)

Description copied from interface: TargetSource

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

Specified by:

releaseTarget in interface TargetSource

Parameters:

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

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()

equals

public boolean equals(Object other)

Two invoker interceptors are equal if they have the same target or if the targets or the targets are equal.

Overrides:

equals in class Object

hashCode

public int hashCode()

SingletonTargetSource uses the hash code of the target object.

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object