modelutil.java

来自「一个非常好的FRAMWRK!是一个外国组织做的!不!」· Java 代码 · 共 89 行

/*
 * Copyright 2003-2005 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.util;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionMapping;

import com.jdon.container.finder.ComponentKeys;
import com.jdon.controller.WebAppUtil;
import com.jdon.model.ModelHandler;
import com.jdon.model.ModelKey;
import com.jdon.model.ModelManager;
import com.jdon.model.mapping.ModelMapping;
import com.jdon.strutsutil.FormBeanUtil;
import com.jdon.util.Debug;

/**
 * if you do not use Jdon's CRUD, so in your Action class call this class's clearModelCache
 * method that can clear the Model cache. 
 * 
 * @author <a href="mailto:[e-mail]">banq</a>
 *
 */
public class ModelUtil {
    private final static String module = ModelUtil.class.getName();

    /**
     * simple method
     * @param actionMapping
     * @param request
     * @param keyValue
     * @throws Exception
     */
    public void clearModelCache(HttpServletRequest request, String keyValue) throws Exception {
        ModelManager modelManager = (ModelManager) WebAppUtil.getComponentInstance(ComponentKeys.MODEL_MANAGER, request);
        modelManager.removeCache(keyValue);
    }

    
    /**
     * if you don't know the keyValue,
     * this method will get the keyValue from Request object,
     * and auotmate remove a model's cache
     *  
     * @param actionMapping
     * @param request
     * @throws Exception
     */
    public void clearModelCache(ActionMapping actionMapping, HttpServletRequest request) throws Exception {

        ModelManager modelManager = (ModelManager) WebAppUtil.getComponentInstance(ComponentKeys.MODEL_MANAGER, request);
        //actionMapping是struts的ActionMapping对象
        String formName = FormBeanUtil.getFormName(actionMapping);
        ModelHandler modelHandler = modelManager.borrowtHandlerObject(formName);
        try {
            ModelMapping modelMapping = modelHandler.getModelMapping();

            String keyName = modelMapping.getKeyName();
            //you must be 
            String keyValue = request.getParameter(keyName);

            ModelKey modelKey = new ModelKey(keyValue, formName);
            modelManager.removeCache(keyValue);

        } catch (Exception ex) {
            Debug.logError(ex, module);
        } finally {
            modelManager.returnHandlerObject(modelHandler);
        }
    }
    
    

}