AspectInj

AspectInj is an AOP solution for Java via Annotation-Processing.This is especially useful on Android.

What can AspectInj Do

Imagine there's a set of existing Java code, and some aspect logic needs to be added.The most direct way is to add static before and after methods arround each method.Obviously it's a much too intrusive solution, but AspectInj can help you to add these join point entries, without any changes to your method code.What you need to do is just adding an annotation to your class.

How to Use

1.Add AspectInj's jar file

The jar file can be compiled by module aspectinj

2.Add JoinPoints annotation to the target class:

@JoinPoints
public class MainActivity extends FragmentActivity {

3.Register point cuts by implementing PointCutRegistry:

public class DemoPointCut implements PointCutRegistry {
    @Override
    public void register(PointCutEntry entry) {
        entry.add("demo.windning.view.MainActivity.onCreate.class#0.onClick(View)",
        new PointCut(){
            @Override
            public boolean onBefore(Object self, Object[] args) {
            	...
                return true;
            }
        });
    }

4.Invoke weave before any main logic:

AspectInjector.weave(new DemoPointCut());

Guides

Assuming there is a class Demo like this:

package com.windning.demo
//demo class
public class Demo {
    //member function
    public void onCreate(Object inst) {
        ...
        //anonymous class
        listener = new OnClickListener() {
            //anonymous class's method
            @Override
            public void onClick(View target) {

            }
        }
    }

    //inner class
    private class DemoModel{
        //inner class's method
        private void init(int arg) {

        }
    }
}

* How to add PointCut around some specific method

public class [UserOwnRegistry] implements PointCutRegistry {
    @Override
    public void register(PointCutEntry entry) {
        entry.add([method position], [customized point cut function]);
    }

The point is to register correct method position(a String) and customize point cut function.

1.method position of normal method:

onCreate in Demo

"com.windning.demo.Demo.onCreate(Object)"

2.method position of inner class's method:

init in Demo.DemoModel

"com.windning.demo.Demo.DemoModel.init(int)"

3.method position of anonymous class's method:

onClick in Demo.onCreate

"com.windning.demo.Demo.onCreate.class#0.onClick(View)"

Note that an anonymous class is identified by "class#" prefix and an index.The index is the order defined in current class/method block counted from 0.

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aspectinj's Introduction

AspectInj

What can AspectInj Do

How to Use

1.Add AspectInj's jar file

2.Add JoinPoints annotation to the target class:

3.Register point cuts by implementing PointCutRegistry:

4.Invoke weave before any main logic:

Guides

* How to add PointCut around some specific method

1.method position of normal method:

2.method position of inner class's method:

3.method position of anonymous class's method:

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