答案 0 :(得分:2)
您不能使用代理执行此操作,但是如果您注释类型而不是局部变量,那么真正的aspectj字节码编织将使您到达那里。 (我不认为支持局部变量访问作为切入点)。无论如何,这里有一些代码。
注释:
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface Later {}
标有此注释的类:
package com.dummy.aspectj;
@Later
public class HeavyObject{
public HeavyObject(){
System.out.println("Boy, I am heavy");
}
}
主要课程:
package com.dummy.aspectj;
public class HeavyLifter{
public static void main(final String[] args){
final HeavyObject fatman = new HeavyObject();
System.out.println("Finished with main");
}
}
和方面:
package com.dummy.aspectj;
public aspect LaterAspect{
pointcut laterInstantiation() :
execution(@Later *.new(..)) ;
void around() : laterInstantiation() {
new Thread(new Runnable(){
@Override
public void run(){
System.out.println("Wait... this is too heavy");
try{
Thread.sleep(2000);
} catch(final InterruptedException e){
throw new IllegalStateException(e);
}
System.out.println("OK, now I am up to the task");
proceed();
}
}).start();
}
}
当你从eclipse运行它作为AspectJ / Java应用程序时,这是HeavyLifter的输出:
Finished with main
Wait... this is too heavy
OK, now I am up to the task
Boy, I am heavy