AOP面向切面编程--解放你的双手

public interface DBOperation {
    int save();

    int delete();

    int insert();

    Object get();
}

public class ProxyActivity extends AppCompatActivity implements DBOperation{
    private final static String TAG = "myTag >>> ";
    DBOperation db;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_proxy);

        db = (DBOperation) Proxy.newProxyInstance(DBOperation.class.getClassLoader()
                ,new Class[]{DBOperation.class},new DBHandler(this));
    }

    public void action(View view) {
        db.delete();
    }

    class DBHandler implements InvocationHandler{
        DBOperation db;

        public DBHandler(DBOperation db) {
            this.db = db;
        }

        @Override
        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
            if (db != null) {
                Log.e("TAG","before");
                save();
                Log.e("TAG","after");
                return method.invoke(db,args);
            }
            return null;
        }
    }

    @Override
    public int save() {
        Log.e(TAG, "保存数据");
        return 0;
    }

    @Override
    public int delete() {
        Log.e(TAG, "删除数据");
        return 0;
    }

    @Override
    public int insert() {
        return 0;
    }

    @Override
    public Object get() {
        return null;
    }
}

import org.aspectj.bridge.IMessage
import org.aspectj.bridge.MessageHandler
import org.aspectj.tools.ajc.Main

final def log = project.logger
final def variants = project.android.applicationVariants

variants.all { variant ->
    if (!variant.buildType.isDebuggable()) {
        log.debug("Skipping non-debuggable build type '${variant.buildType.name}'.")
        return;
    }

    JavaCompile javaCompile = variant.javaCompile
    javaCompile.doLast {
        String[] args = ["-showWeaveInfo",
                         "-1.8",
                         "-inpath", javaCompile.destinationDir.toString(),
                         "-aspectpath", javaCompile.classpath.asPath,
                         "-d", javaCompile.destinationDir.toString(),
                         "-classpath", javaCompile.classpath.asPath,
                         "-bootclasspath", project.android.bootClasspath.join(File.pathSeparator)]
        log.debug "ajc args: " + Arrays.toString(args)

        MessageHandler handler = new MessageHandler(true);
        new Main().run(args, handler);
        for (IMessage message : handler.getMessages(null, true)) {
            switch (message.getKind()) {
                case IMessage.ABORT:
                case IMessage.ERROR:
                case IMessage.FAIL:
                    log.error message.message, message.thrown
                    break;
                case IMessage.WARNING:
                    log.warn message.message, message.thrown
                    break;
                case IMessage.INFO:
                    log.info message.message, message.thrown
                    break;
                case IMessage.DEBUG:
                    log.debug message.message, message.thrown
                    break;
            }
        }
    }
}

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface ClickBehavior {
    String value();
}

@Aspect//定义切面类
public class ClickBehaviorAspectJ {
    private final static String TAG = "myTag >>> ";
    //execution 定义切入点
    //* *(..)) 通配符 可以处理所有ClickBehavior注解的方法
    @Pointcut("execution(@com.chs.architecturetest.annotation.ClickBehaviorAspectJ * *(..))")
    public void methodPointCut() {}


    //对切入点方法应该如何处理 环绕通知 切入点之前和之后需要做的的事情
    @Around("methodPointCut()")
    public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
        //获取签名方法
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //获取方法名
        String methodName = signature.getName();
        //获取class名
        String className = signature.getDeclaringType().getSimpleName();
        //获取需要统计的value值
        String funName = signature.getMethod().getAnnotation(com.chs.architecturetest.annotation.ClickBehavior.class).value();
        //当前时间
        long begin = System.currentTimeMillis();
        Log.e(TAG,"ClickBehaviorAspectJ Method Before");
        Object proceed = joinPoint.proceed();
        Log.e(TAG,"ClickBehaviorAspectJ Method End");
        //执行时间
        long duration =  System.currentTimeMillis() - begin;

        Log.e(TAG, String.format("统计了：%s功能，在%s类的%s方法，用时%d ms",
                funName, className, methodName, duration));
        return proceed;
    }
}

@ClickBehavior("VIP页面")
public void goToVip(View view) {
  Log.e(TAG,"去VIP页面");
  startActivity(new Intent(this,OtherActivity.class));
}
@ClickBehavior("账户页面")
public void goToZh(View view) {
    Log.e(TAG,"去账户页面");
    startActivity(new Intent(this,OtherActivity.class));
}

@ClickBehavior("登录页面")
public void goToLogin(View view) {
    Log.e(TAG,"去登录页面");
}

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface LoginBehavior {
}

@Aspect//定义切面类
public class LoginAspectJ {
    private final static String TAG = "myTag >>> ";
    //execution 定义切入点
    //* *(..)) 通配符 可以处理所有ClickBehavior注解的方法
    @Pointcut("execution(@com.chs.architecturetest.annotation.LoginBehavior * *(..))")
    public void methodPointCut() {}


    //对切入点方法应该如何处理 环绕通知 切入点之前和之后需要做的的事情
    @Around("methodPointCut()")
    public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
        //是否登录真实项目中去sharedprefrence中去那
        Context context = (Context) joinPoint.getThis();
        if(false){
            Log.e(TAG, "检测到已登录！");
            return joinPoint.proceed();
        }else {
            Log.e(TAG, "检测到没有登录！");
            context.startActivity(new Intent(context,LoginActivity.class));
            return null;
        }
    }
}

@LoginBehavior
    @ClickBehavior("VIP页面")
    public void goToVip(View view) {
      Log.e(TAG,"去VIP页面");
      startActivity(new Intent(this,OtherActivity.class));
    }
    @LoginBehavior
    @ClickBehavior("账户页面")
    public void goToZh(View view) {
        Log.e(TAG,"去账户页面");
        startActivity(new Intent(this,OtherActivity.class));
    }

    @ClickBehavior("登录页面")
    public void goToLogin(View view) {
        Log.e(TAG,"去登录页面");
    }