webservicedecorator.java

一个非常好的FRAMWRK!是一个外国组织做的!不!

/*
 * 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.controller.service;

import javax.servlet.http.HttpServletRequest;

import com.jdon.container.ContainerWrapper;
import com.jdon.container.access.ServiceAccessor;
import com.jdon.container.access.TargetMetaRequest;
import com.jdon.container.finder.ComponentKeys;
import com.jdon.container.finder.ContainerCallback;
import com.jdon.container.visitor.ComponentVisitor;
import com.jdon.container.visitor.data.SessionContext;
import com.jdon.security.web.UserPrincipalSetup;

/**
 * before accessing container, we can do something and store
 * some state into UserTargetMetaDef object.
 * 
 * @author <a href="mailto:banqJdon<AT>jdon.com">banq</a>
 *
 */

public class WebServiceDecorator implements WebServiceAccessor {

    
    private ServiceAccessor serviceAccessor;
    private ContainerCallback containerCallback;
        
    /**
     * @param serviceAccessor
     */
    public WebServiceDecorator(ServiceAccessor serviceAccessor, ContainerCallback containerCallback) {
        this.serviceAccessor = serviceAccessor;
        this.containerCallback = containerCallback;
    }
    
    /* 
     * 1. create a  SessionContext object in httpsession
     * 2. save the principle name in the session context.
     * the principle name the request.getPrincipleNme
     * you can save more attribute in the SessionContext object by replcaing this class in container.xml
     * 
     */
    public Object getService(TargetMetaRequest targetMetaRequest, HttpServletRequest request) {
        ContainerWrapper cw = containerCallback.getContainerWrapper();
        UserPrincipalSetup userPrincipalSetup = (UserPrincipalSetup)cw.lookup(ComponentKeys.SESSIONCONTEXT_SETUP);

        targetMetaRequest.setVisitableName(ComponentKeys.SESSIONCONTEXT_FACTORY);  
        ComponentVisitor componentVisitor = targetMetaRequest.getComponentVisitor();
        SessionContext sessionContext = (SessionContext)componentVisitor.visitSessionContext(targetMetaRequest);      
        
        targetMetaRequest.setSessionContext(sessionContext);
        userPrincipalSetup.saveSessionContext(sessionContext, request);
        return serviceAccessor.getService(targetMetaRequest);
    }

    /* 
     * 1. create a  SessionContext object in httpsession
     * 2. save the principle name in the session context.
     * the principle name the request.getPrincipleNme
     * you can save more attribute in the SessionContext object by replcaing this class in container.xml
     */
    public Object execute(TargetMetaRequest targetMetaRequest, HttpServletRequest request) throws Exception {
        ContainerWrapper cw = containerCallback.getContainerWrapper();
        UserPrincipalSetup sessionContextSetup = (UserPrincipalSetup)cw.lookup(ComponentKeys.SESSIONCONTEXT_SETUP);
        
        targetMetaRequest.setVisitableName(ComponentKeys.SESSIONCONTEXT_FACTORY);        
        ComponentVisitor componentVisitor = targetMetaRequest.getComponentVisitor();
        SessionContext sessionContext = (SessionContext)componentVisitor.visitSessionContext(targetMetaRequest);
        
        targetMetaRequest.setSessionContext(sessionContext);
        sessionContextSetup.saveSessionContext(sessionContext, request);
        return serviceAccessor.executeService(targetMetaRequest, cw);
    }

}