applicationcomponentmanager.java

ejb克斯人随风俗

/* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 
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   the documentation and/or other materials provided with the
   distribution.
 
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 contributors may be used to endorse or promote products derived
 from this software without specific prior written permission.
 
 This software is provided "AS IS," without a warranty of any
 kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
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 $Id: ApplicationComponentManager.java,v 1.1 2004/04/15 03:44:03 yutayoshida Exp $ */

package com.sun.j2ee.blueprints.waf.controller.web;

import java.beans.Beans;
import java.util.HashMap;
import javax.servlet.*;
import javax.servlet.http.*;

// Service Locator imports
import com.sun.j2ee.blueprints.servicelocator.web.ServiceLocator;

// tracer import
import com.sun.j2ee.blueprints.util.tracer.Debug;

// WAF imports
import com.sun.j2ee.blueprints.waf.util.JNDINames;
import com.sun.j2ee.blueprints.waf.controller.web.util.WebKeys;
import com.sun.j2ee.blueprints.waf.controller.web.URLMappingsXmlDAO;


/**
 *  Provides all the startup objects needed by the WAF which will
 *  be loaded when the application Servlet Context is started
 */
public class ApplicationComponentManager implements ServletContextListener {
    
    public ApplicationComponentManager() {}
    
    public void contextDestroyed(ServletContextEvent sce){
        // do nothing for destroying now
    }
    
    public void contextInitialized(ServletContextEvent sce){
        try {
            doInit(sce.getServletContext());
            getRequestProcessor(sce.getServletContext());
            getScreenFlowManager(sce.getServletContext());
        } catch (Throwable ex) {
            System.out.println("WAF ApplicaitonComponentManager Error Initializing:" + ex);
            throw new RuntimeException(ex);
        }
    }
    
    private void doInit(ServletContext context) {
        String requestMappingsURL = null;
        try {
            requestMappingsURL = context.getResource("/WEB-INF/mappings.xml").toString();
        } catch (java.net.MalformedURLException ex) {
            System.err.println("ApplicationComponentManager: initializing ScreenFlowManager malformed URL exception: " + ex);
        }
        HashMap urlMappings = URLMappingsXmlDAO.loadRequestMappings(requestMappingsURL);
        context.setAttribute(WebKeys.URL_MAPPINGS, urlMappings);
        HashMap eventMappings = URLMappingsXmlDAO.loadEventMappings(requestMappingsURL);
        context.setAttribute(WebKeys.EVENT_MAPPINGS, eventMappings);
    }
       
    public static RequestProcessor getRequestProcessor(ServletContext context) {
        RequestProcessor rp = (RequestProcessor)context.getAttribute(WebKeys.REQUEST_PROCESSOR);
        if ( rp == null ) {
            rp = new RequestProcessor();
            rp.init(context);
            context.setAttribute(WebKeys.REQUEST_PROCESSOR, rp);
        }
        return rp;
    }
    
    public static ScreenFlowManager getScreenFlowManager(ServletContext context) {
        ScreenFlowManager screenManager = (ScreenFlowManager)context.getAttribute(WebKeys.SCREEN_FLOW_MANAGER);
        if (screenManager == null ) {
            screenManager = new ScreenFlowManager();
            screenManager.init(context);
            context.setAttribute(WebKeys.SCREEN_FLOW_MANAGER, screenManager);
        }
        return screenManager;
    }
}