代理模式

• 静态代理，实现同装饰

  • class TankTimeProxy implements Movable {
        Movable m;
        @Override
        public void move(){
            m.move();
        }
    }

• 动态代理，Proxy调asm生成代理类

  • Tank tank = new Tank();
    Movable m = (Movable)Proxy.newProxyInstance(Tank.class.getClassLoader()), 
        new Class[]{Movable.class},
        new Hander(tank)
    );
    class Handler implements InvocationHandler {
        Tank tank;
        @Override
        public Object invoke(Object proxy, Method method, Object[] args) {
            return method.invoke(tank, args);
        }
    }
     
    // 动态代理, CGLIB调asm，由于是继承，所以final类不能代理
    Enhancer enhancer = new Enhancer();
    enhancer.setSuperclass(Tank.class);
    enhancer.setCallback(new TimeMethodInterceptor());
    Tank tank = (Tank)enhancer.create();
    tank.move();
    class TimeMethodInterceptor implements MethodInterceptor {
        @Override
        public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) {
            return methodProxy.invokeSuper(o, objects);
        }
    }
     
    // Spring AOP: aspect指定代理类, pointcut指定被代理方法