servicemethodaction.java

用jbuilder写的源程序

/*
 * Copyright 2003-2006 the original author or authors.
 * 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.strutsutil;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import com.jdon.controller.WebAppUtil;
import com.jdon.controller.events.EventModel;
import com.jdon.controller.model.ModelIF;
import com.jdon.model.ModelForm;
import com.jdon.model.ModelHandler;
import com.jdon.model.handler.HandlerMetaDef;
import com.jdon.util.Debug;

/**
 * Command pattern for service invoke
 * sample:
 * browser url: /aaa.do?method=xxxxx 
 * 
 * xxxxx is the service's method, such as:
 * 
 * public interface TestService{
 *  　　 void xxxxx(EventModel em);　　 
 * }
 *  
 * to implements those function as above, we must confiure the struts-config.xml and jdonframework.xml 
 * 
 * <action path="/aaa" type="com.jdon.strutsutil.com.jdon.strutsutil.ServiceMethodAction"　name="aForm" scope="request"validate="false">
 * <forward name="xxxxx" path="/xxx.jsp"/>
 * </action>
 * 
 * jdonframework.xml
 * <model key="primary key of your model" class ="your model class">
 *   <actionForm name="aForm"/>
 *   <handler>
 *       <service ref="testService" /> 
 *   </handler>
 * </model>
 * <pojoService name="testService" 　　　　 
 * 　　　　　　 class="com.jdon.framework.test.service.TestServicePOJOImp"/>
 * 
 * @author <a href="mailto:[e-mail]">banq</a>
 *
 */
public class ServiceMethodAction extends ModelBaseAction {
    private final static String module = ServiceMethodAction.class.getName();

    public ActionForward execute(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        intContext(this.getServlet().getServletContext());

        ModelForm modelForm = (ModelForm) actionForm;
        if ((modelForm == null) || (modelForm.getMethod() == null)) {
            Debug.logError("[JdonFramework] no form or no action/method ", module);
            return actionMapping.findForward("forward");
        }
        String formName = FormBeanUtil.getFormName(actionMapping);
        Debug.logVerbose("[JdonFramework]--> enter ServiceMethodAction, formName = " + formName, module);
        ModelHandler modelHandler = modelManager.borrowtHandlerObject(formName);
        EventModel em = new EventModel();
        try {            
            ModelIF modelDTO = modelManager.getModelObject(formName);
            modelHandler.formCopyToModelIF(modelForm, modelDTO);
            
            HandlerMetaDef hm = modelHandler.getModelMapping().getHandlerMetaDef();
            
            String serviceName = hm.getServiceRef();
            
            em.setActionName(modelForm.getMethod());
            em.setModelIF(modelDTO);
            Object result = WebAppUtil.callService(serviceName, modelForm.getMethod(), new Object[]{em}, request);
            if (result instanceof ModelIF){
            	modelDTO = (ModelIF)result;
            	modelHandler.modelIFCopyToForm(modelDTO, modelForm);
            }
        } catch (Exception ex) {
            Debug.logError("[JdonFramework]please check your service 、 model or form :" + ex, module);
            throw new Exception("System error! please call system Admin." + ex);
        } finally {
            modelManager.returnHandlerObject(modelHandler);
        }
        if (em.getErrors() != null) {
            Debug.logError("[JdonFramework] error happend " + em.getErrors(), module);
            ActionMessages errors = new ActionMessages();
            ActionMessage error = new ActionMessage(em.getErrors());
            errors.add(ActionMessages.GLOBAL_MESSAGE, error);
            saveErrors(request, errors);
        } 
        return actionMapping.findForward(modelForm.getAction());
    }
}