Collation: Java dynamic agent

1. Define the Business interface

Public InterfaceIPerson {
    Public voidsay();
Public voidRun();
Public voidSleep();
}

2. Implementing the Business Interface

Public classPersonimplImplementsIPerson {
    @Override
    Public voidsay() {
Logutil.e("person say");
    }

    @Override
    Public voidRun() {
Logutil.e("Person Run");
    }

    @Override
    Public voidSleep() {
Logutil.e("Person Sleep");
    }
}

3. Define a dynamic proxy class that implementsInvocationhandler Interface

Public classPersonhandleImplementsInvocationhandler {
    PrivateObjectObject;//keep the original object of the agent

     PublicPersonhandle (Object object) {
        Super();
 This.Object= Object;//Construction Injection
    }

    @Override
     PublicObjectInvoke(Object Proxy, Method method, Object[] args)throwsThrowable {
Object result=null;

        //if it issaymethod, there is a predecessor and a post-operation
        if(Method.getname (). Equals ("Say")){
Dobefore ();
            Result=method.invoke (Object,Args;
            Doafter ();
        }

        //if it isRunmethod, only the post operation
        else if(Method.getname (). Equals ("Run")){
Result=method.invoke (Object,Args;
            Doafter ();
        }

        //if it isSleepmethod, you don't do anything.
        else if(Method.getname (). Equals ("Run")){

}
        returnResult;
    }

    private voidDobefore() {
Logutil.e("Before method Invoke");
    }

    private voidDoafter() {
Logutil.e("After method Invoke");
    }
}

4. Scene class

Public classTestClientextendsInstrumentationtestcase {

    Public voidTestmain() {
Logutil.e("Testclient:[start]");

        IPerson person=NewPersonimpl ();
        Invocationhandler handler=NewPersonhandle (person);

        IPerson proxy= (IPerson) proxy.newproxyinstance(Person.getclass (). getClassLoader (),Person.getclass (). Getinterfaces (),Handler;
        Proxy.say ();
        Proxy.run ();

        Logutil.e("Testclient:[end]");
    }

}

5. Running Results




From for notes (Wiz)

Collation: Java dynamic agent