ejbtargetservice.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.target;


import javax.ejb.*;

import java.lang.reflect.Method;

import com.jdon.bussinessproxy.meta.EJBTargetMetaDef;
import com.jdon.bussinessproxy.TargetService;
import com.jdon.servicelocator.web.ServiceLocator;

import com.jdon.servicelocator.ServiceLocatorException;

import com.jdon.util.Debug;
import com.jdon.bussinessproxy.TargetMetaDef;


/**
 * 生成EJBObject 或EJBLocalObject
 *
 * </p>
 * <p>Copyright: Jdon.com Copyright (c) 2003</p>
 * <p></p>
 * @author banq
 * @version 1.0
 */

public class EJBTargetService implements TargetService {

  private final static String module = EJBTargetService.class.getName();
  private ServiceLocator sl = null;

  public EJBTargetService(ServiceLocator sl){
    this.sl = sl;
  }
  /**
   * 获得Local或remote的Home接口
   * @param EJBDefinition
   * @return
   */
  public Object createObject(TargetMetaDef targetMetaDef) throws Throwable {
    Object obj = null;
    Debug.logVerbose(" enter createObject in EJBTargetService ", module);
    try {
      if (!targetMetaDef.isEJB()) {
        Debug.logError("targetMetaDef is not EJB: " + targetMetaDef.getClassName(), module);
        return null;
      }
      EJBTargetMetaDef eJBMetaDef = (EJBTargetMetaDef)targetMetaDef;
      if (eJBMetaDef.isLocal()) {
        EJBLocalHome home = (EJBLocalHome) sl.getLocalHome(eJBMetaDef.
            getJndiName());
        Method createMethod = home.getClass().getMethod("create", null);
        obj = (EJBLocalObject) createMethod.invoke(home, null);
      } else {
        obj = sl.getRemoteHome(eJBMetaDef.getJndiName(),
                               eJBMetaDef.getHomeClass());
      }
    } catch (ServiceLocatorException sle) {
      Debug.logError("locator error: " + sle, module);
      throw new Throwable("JNID error:" + sle);
    } catch (Exception ex) {
      Debug.logError("locator error: " + ex, module);
      throw new Throwable(ex);
    }
    return obj;
  }





}