webinvocationhandler.java

Java/J2EE框架Jdon-Framework系统的Sample

/**
 * Copyright 2005 Jdon.com
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

package com.jdon.bussinessproxy.web;

import com.jdon.util.Debug;

import com.jdon.bussinessproxy.TargetMetaDef;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

import com.jdon.bussinessproxy.cache.ComponentCacheVisitor;
import com.jdon.bussinessproxy.MyComponentProps;
import com.jdon.bussinessproxy.AopClient;
import com.jdon.bussinessproxy.meta.MethodMetaArgs;


/**
 * 动态代理类
 *
 * 可实现AOP拦截
 *
 * <p>Copyright: Jdon.com Copyright (c) 2003</p>
 * <p></p>
 * @author banq
 * @version 1.0
 */

public class WebInvocationHandler implements InvocationHandler,
    MyComponentProps, java.io.Serializable {

  private final static String module = WebInvocationHandler.class.getName();

  private AopClient aopClient;
  private TargetMetaDef targetMetaDef;
  private ComponentCacheVisitor cm;

  public WebInvocationHandler(TargetMetaDef targetMetaDef, AopClient aopClient) {
    this.targetMetaDef = targetMetaDef;
    this.aopClient = aopClient;
  }

  public void setVisitor(ComponentCacheVisitor cm) {
    this.cm = cm;
  }

  /**
   * 方法调用
   * 需要拦截方法在这里实现。
   * @param p_proxy Object
   * @param m Method
   * @param args Object[]
   * @throws Throwable
   * @return Object
   */
  public Object invoke(Object p_proxy, Method m, Object[] args) throws
      Throwable {
    Debug.logVerbose("call method:" + m.getName(), module);
    Object result = null;
    try {
      MethodMetaArgs methodMetaDef = new MethodMetaArgs(m, args);
      targetMetaDef.setMethodMetaArgs(methodMetaDef);
      result = aopClient.invoke(cm, targetMetaDef);
      Debug.logVerbose("call method:" + m.getName() + " finish!", module);
    } catch (Exception ex) {
      Debug.logError(ex, module);
    } catch (Throwable ex) {
      throw new Throwable(ex);
    }

    return result;

  }

}