/*
 * Copyright James House (c) 2001-2004
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met: 1.
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer. 2. Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *  
 */

package org.infoglue.deliver.jobs;

import java.io.IOException;
import java.util.Properties;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.quartz.Scheduler;
import org.quartz.impl.StdSchedulerFactory;

/**
 * <p>
 * A Servlet that can be used to initialize Quartz, if configured as a
 * load-on-startup servlet in a web application.
 * </p>
 * 
 * <p>
 * You'll want to add something like this to your WEB-INF/web.xml file:
 * 
 * <pre>
 *  <servlet> 
 *      <servlet-name>
 *          QuartzInitializer
 *      </servlet-name> 
 *      <display-name>
 *          Quartz Initializer Servlet
 *      </display-name> 
 *      <servlet-class>
 *          org.quartz.ee.servlet.QuartzInitializerServlet
 *      </servlet-class> 
 *      <load-on-startup>
 *          1
 *      </load-on-startup>
 *      <init-param>
 *          <param-name>config-file</param-name>
 *          <param-value>/some/path/my_quartz.properties</param-value>
 *      </init-param>
 *      <init-param>
 *          <param-name>shutdown-on-unload</param-name>
 *          <param-value>true</param-value>
 *      </init-param>
 *  </servlet>
 * </pre>
 * </p>
 * <p>
 * The init parameter 'config-file' can be used to specify the path (and 
 * filename) of your Quartz properties file.  If you leave out this parameter, 
 * the default ("quartz.properties") will be used.
 * </p>
 * 
 * <p>
 * The init parameter 'shutdown-on-unload' can be used to specify whether you
 * want scheduler.shutdown() called when the servlet is unloaded (usually when
 * the application server is being shutdown).  Possible values are "true" or
 * "false".  The default is "true".
 * </p>
 * 
 * @author James House
 */
public class QuartzInitializerServlet extends HttpServlet {

    private boolean performShutdown = true;
    
    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Interface.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    public void init(ServletConfig cfg) throws javax.servlet.ServletException {
        super.init(cfg);

        System.out.println("AAAAAAAAAAAAAAAA Quartz Initializer Servlet loaded, initializing Scheduler...");
        log("Quartz Initializer Servlet loaded, initializing Scheduler...");
        
        StdSchedulerFactory factory;
        try {

            String configFile = cfg.getInitParameter("config-file");
            String shutdownPref = cfg.getInitParameter("shutdown-on-unload");
            if(configFile == null) {
    			Properties properties = new Properties();
    			properties.load(QuartzInitializerServlet.class.getResourceAsStream("/quartz.properties"));
    			factory = new StdSchedulerFactory();
            } else {
            	factory = new StdSchedulerFactory(configFile);
            }
            
            if(shutdownPref != null)
                performShutdown = Boolean.valueOf(shutdownPref).booleanValue();
                
            Scheduler scheduler = factory.getScheduler();
            scheduler.start();
    
          } catch (Exception e) {
              e.printStackTrace();
              log("Quartz Scheduler failed to initialize: " + e.toString());
              throw new ServletException(e);
          }
    }

    public void destroy() {
        
        if(!performShutdown)
            return;
        
        try {
            Scheduler sched = StdSchedulerFactory.getDefaultScheduler();

            if (sched != null) sched.shutdown();
        } catch (Exception e) {
            log("Quartz Scheduler failed to shutdown cleanly: " + e.toString());
            e.printStackTrace();
        }

        log("Quartz Scheduler successful shutdown.");
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.sendError(HttpServletResponse.SC_FORBIDDEN);
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.sendError(HttpServletResponse.SC_FORBIDDEN);
    }

}