defaultserviceadapter.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 javax.servlet.http.*;
import com.jdon.util.Debug;
import com.jdon.bussinessproxy.cache.ComponentCacheVisitor;

import com.jdon.bussinessproxy.ServiceAdapter;
import com.jdon.bussinessproxy.TargetMetaDef;
import com.jdon.bussinessproxy.cache.VisitorFactory;
import com.jdon.bussinessproxy.cache.VisitableNames;

/**
 * 面向客户端调用的服务
 *
 * <p>Copyright: Jdon.com Copyright (c) 2003</p>
 * <p></p>
 * @author banq
 * @version 1.0
 */
public class DefaultServiceAdapter implements ServiceAdapter {

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

  private VisitorFactory visitorFactory;

  public DefaultServiceAdapter(VisitorFactory visitorFactory) {
    this.visitorFactory = visitorFactory;
  }

  /**
   * 获得动态代理指引
   *
   * @param EJBDefinition
   * @param request
   * @return Proxy.newProxyInstance
   */
  public Object getService(TargetMetaDef targetMetaDef,
                           HttpServletRequest request) {
    if (!targetMetaDef.isEJB()) {
      Debug.logError("targetMetaDef is not EJB: " + targetMetaDef.getClassName(),
                     module);
      return null;
    }

    ComponentCacheVisitor cmcv = visitorFactory.createCacheVisitor(request,
                                 targetMetaDef);
    //首先访问动态代理Proxy.newInstance
    targetMetaDef.setVisitableName(VisitableNames.PROXYINSTANCE_NAME);
    Debug.logVerbose(VisitableNames.PROXYINSTANCE_NAME + " in action", module);
    Object dynamicProxy = cmcv.visit(targetMetaDef);
    return dynamicProxy;
  }




}