JBOSSAOP学习笔记-标签使用(J2SE5.0)中的元数据

import org.jboss.aspects.Oneway;

public class Foo
{
   @Oneway public static void someMethod() {...}

   public static void main(String[] args)
   {
      someMethod(); // executes in background
   }
}

 package org.jboss.aspects;

import java.lang.annotation.ElementType;
import java.lang.annotation.Target;

@Target({ElementType.METHOD})
public @interface Oneway {}

package org.jboss.aspects;

public OnewayAspect
{
   PRivate static class Task implements Runnable
   {
      private MethodInvocation invocation;

      public Task(MethodInvocation invocation)
      {
        this.invocation = invocation;
      }
      public void run()
      {
        try { invocation.invokeNext(); }
        catch (Throwable ignore) { }
      }
   }

   public Object oneway(MethodInvocation invocation) throws Throwable
   {
      MethodInvocation copy = invocation.copy();
      Thread t = new Thread(new Task(copy));
      t.setDaemon(false);
      t.start();
      return null;
   }
}

<aop>
   <aspect class="org.jboss.aspects.OnewayAspect"/>

   <bind pointcut="execution(void *->@org.jboss.Oneway(..))">
      <advice name="oneway"
              aspect="org.jboss.aspects.OnewayAspect"/>
   </bind>
</aop>

import org.jboss.aspects.Threadbased;

public class Foo
{
   @Threadbased private int counter;
}

package org.jboss.aspects;

import java.lang.annotation.ElementType;
import java.lang.annotation.Target;

@Target({ElementType.FIELD})
public @interface Threadbased {}

package org.jboss.aspects;

import org.jboss.aop.joinpoint.*;
import java.lang.reflect.Field;

public class ThreadbasedAspect
{
   private ThreadLocal threadbased = new ThreadLocal();

   public Object access(FieldReadInvocation invocation)
       throws Throwable
   {
      // just in case we have a primitive,
      // we can't return null
      if (threadbased.get() == null)
          return invocation.invokeNext();
      return threadbased.get();
   }

   public Object access(FieldWriteInvocation invocation)
       throws Throwable
   {
      threadbased.set(invocation.getValue());
      return null;
   }
}

<aop>
   <aspect class="org.jboss.aspects.ThreadbasedAspect"
           scope="PER_JOINPOINT"/>
   <bind pointcut="field(* *->@org.jboss.aspects.Threadbased)">
      <advice name="access"
              aspect="org.jboss.aspects.ThreadbasedAspect"/>
   </bind>
</aop>

（出处：http://www.VeVb.com）