Android Open Source - Common-Library Proxy Usage

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License

The source code is released under:
Apache License
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Java Source Code

package com.morgan.library.snippet;
// ww w .j a  v a  2  s  . com
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

/**
 * ??????????
 * 
 * @author Morgan.Ji
 * 
 */
public class ProxyUsage {

  /**
   * @param args
   */
  public static void main(String[] args) {
    testStaticProxy();
    testJDKProxy();
    testCGLibProxy();
  }

  private static void testStaticProxy() {
    Request req = new HttpRequest();
    RequestProxy proxy = new RequestProxy();
    proxy.buildProxy(req);
    proxy.request();
  }

  private static void testCGLibProxy() {
    Request req = new HttpRequest();
    JDKProxy proxy = new JDKProxy();
    Request reqProxy = (Request) proxy.createProxy(req);
    reqProxy.request();
  }

  private static void testJDKProxy() {
    Student stu = new Student();
    CGLibProxy proxy = new CGLibProxy();
    Student stuProxy = (Student) proxy.createProxy(stu);
    stuProxy.doSomeThing();
  }

}

interface Request {
  public void request();
}

class HttpRequest implements Request {

  @Override
  public void request() {
    System.out.println("http request......");
  }
}

/**
 * ???(?????????)
 * 
 * @author Morgan.Ji
 */
class RequestProxy implements Request {
  // ???????
  private Request req;

  public void buildProxy(Request req) {
    this.req = req;
  }

  @Override
  public void request() {
    // ?????
    doBefore();
    req.request();
    // ??????
    doAfter();
  }

  private void doAfter() {
    System.out.println("after method invoke");
  }

  private void doBefore() {
    System.out.println("before method invoke");
  }
}

/**
 * ????????
 * 
 * @author Morgan.Ji
 * 
 */
class JDKProxy implements InvocationHandler {
  private Object target;

  public Object createProxy(Object target) {
    this.target = target;
    return Proxy.newProxyInstance(target.getClass().getClassLoader(),
        target.getClass().getInterfaces(), this);
  }

  /**
   * @param proxy
   *            ???????
   * @param method
   *            ???????
   * @param args
   *            ??????????????
   *            ?????InvocationHandler???????????????????????????????ProxySubject
   */
  @Override
  public Object invoke(Object proxy, Method method, Object[] args)
      throws Throwable {

    Object retVal = null;
    // ?????
    doBefore();
    retVal = method.invoke(target, args);
    // ??????
    doAfter();
    return retVal;
  }

  private void doAfter() {
    System.out.println("after method invoke");
  }

  private void doBefore() {
    System.out.println("before method invoke");
  }
}

class Student {

  public void doSomeThing() {
    System.out.println("day day study,day day up...");
  }
}

/**
 * ??CGLib?????????
 * 
 */
class CGLibProxy implements MethodInterceptor {
  // ???????????
  private Object obj;
  private Enhancer enhancer = new Enhancer();

  public Object createProxy(Object target) {
    this.obj = target;
    enhancer.setSuperclass(this.obj.getClass());// ????????
    enhancer.setCallback(this);// ????
    enhancer.setClassLoader(target.getClass().getClassLoader());
    return enhancer.create();
  }

  /**
   * ?????????????????????
   * 
   * @param proxy
   *            ?????
   * @param method
   *            ????????
   * @param params
   *            ??????????
   * @param methodProxy
   */
  @Override
  public Object intercept(Object proxy, Method method, Object[] params,
      MethodProxy methodProxy) throws Throwable {
    Object result = null;
    // ?????
    doBefore();
    // ?????????
    result = methodProxy.invokeSuper(proxy, params);
    // ??????
    doAfter();
    return result;
  }

  private void doAfter() {
    System.out.println("after method invoke");
  }

  private void doBefore() {
    System.out.println("before method invoke");
  }

}
Java Source Code List
