org.springframework.aop.target
Class ThreadLocalTargetSource

org.springframework.aop.target.AbstractPrototypeTargetSource
  |
  +--org.springframework.aop.target.ThreadLocalTargetSource

public final class ThreadLocalTargetSource

extends AbstractPrototypeTargetSource

implements DisposableBean, ThreadLocalTargetSourceStats

Alternative to an object pool. This TargetSource uses a threading model in which every thread has its own copy of the target. There's no contention for targets. Target object creation is kept to a minimum on the running server.

Application code is written as to a normal pool; callers can't assume they will be dealing with the same instance in invocations in different threads. However, state can be relied on during the operations of a single thread: for example, if one caller makes repeated calls on the AOP proxy.

Cleanup is performed in the destroy() method from DisposableBean.

Author:

Rod Johnson

Version: $Id: ThreadLocalTargetSource.java,v 1.6 2004/01/21 20:21:35 johnsonr Exp $

Method Detail

destroy

public void destroy()

Dispose of targets if necessary; clear ThreadLocal.

See Also:

org.springframework.beans.factory.DisposableBean.destroy()

public int getHits()

public int getInvocations()

public int getObjects()

public InterceptionIntroductionAdvisor getStatsMixin()

Return an introduction advisor mixin that allows the AOP proxy to be case to ThreadLocalInvokerStats.

public Object getTarget()

Implementation of abstract getTarget() method. We look for a target held in a ThreadLocal. If we don't find one, we create one and bind it to the thread. No synchronization is required.

public void releaseTarget(Object o)

See Also:

org.springframework.aop.TargetSource.releaseTarget(java.lang.Object)

Association Links

to Class java.lang.ThreadLocal

ThreadLocal holding the target associated with the current thread. Unlike most ThreadLocals, which are static, this variable is meant to be per thread per instance of the ThreadLocalTargetSource class.

to Class java.util.Set

Set of managed targets, enabling us to keep track of the targets we've created.