Composite Interceptors

Composite interceptors have two meanings:

• Multiple interceptors can intercept the same join point at the same time.
• Multiple interceptors can take effect at different locations at the same time.

First, multiple interceptors can intercept one join point. Their effective order is A first, then B. The code is shown below:

Example

@Aop({SimpleInterceptorA.class, SimpleInterceptorB.class })
public class AopBean {
    ...
}

Second, multiple interceptors can take effect at different locations:

@Aop(ClassInterceptor.class)
public class AopBean {
    public String print() {
        ...
    }

    @Aop(MethodInterceptor.class)
    public String echo(String sayMessage) {
        return "echo :" + sayMessage;
    }
}

In this case, ClassInterceptor takes effect when print is called. When echo is called, both ClassInterceptor and MethodInterceptor take effect, in the order class first, then method.

If a global AOP interceptor is also configured, the effective order is: global level -> class level -> method level.