butorcontextlistener.java

一个实用工具类

/*
 * Copyright (C) butor.com. All rights reserved.
 *
 * This software is published under the terms of the GNU Library General
 * Public License (GNU LGPL), a copy of which has been included with this
 * distribution in the LICENSE.txt file. 
 */


package org.butor.web.listener;

import java.io.File;
import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.ServletException;

import org.butor.config.ConfigFactory;
import org.butor.config.IConfig;
import org.butor.fwService.starter.FwServiceStarter;
import org.butor.helper.PropertiesHelper;
import org.butor.log.Log;

/**
 * @author sawanai
 *
 */
public class ButorContextListener implements ServletContextListener {

	// System arguments.
	public static final String PARAM_APP_CONFIG = "butor_app_config";
	public static final String DEFAULT_APP_CONFIG_FILENAME =
		"WEB-INF/conf/app-config.xml";

	protected FwServiceStarter f_serviceStarter = null;
	protected static String f_contextBase = null;
	protected static String f_contextName = null;
	protected IConfig f_config = null;

	/**
	 * 
	 */
	public ButorContextListener() {
		super();
	}

	/* (non-Javadoc)
	 * @see javax.servlet.ServletContextListener#contextInitialized(javax.servlet.ServletContextEvent)
	 */
	public void contextInitialized(ServletContextEvent arg0) {
		try {
			PropertiesHelper.loadSystemProperties();
			
			startServices(arg0.getServletContext());
		} catch (ServletException e) {
			Log.logException(this, Log.LOG_TYPE_ERROR, "contextInitialized()", e);
		}
	}

	/* (non-Javadoc)
	 * @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
	 */
	public void contextDestroyed(ServletContextEvent arg0) {
		stopServices();
		
		f_serviceStarter = null;
		f_contextBase = null;
		f_contextName = null;
		f_config = null;
	}

	/**
	 * Start this webapp services.
	 *
	 * @exception ServletException if we cannot configure ourselves correctly
	 */
	protected void startServices(ServletContext context)
		throws ServletException {

		Log.logStr(this, Log.LOG_TYPE_INFO, "startServices()", "Starting services ...");

		f_contextBase = context.getRealPath(File.separator);
		int pos = f_contextBase.lastIndexOf(File.separator);
		f_contextBase = f_contextBase.substring(0, pos);

		pos = f_contextBase.lastIndexOf(File.separator);
		f_contextName = f_contextBase.substring(pos + 1);

		loadConfig();

		f_serviceStarter = new FwServiceStarter(f_config);

		if (Log.shouldLog(this.getClass().getName(), Log.LOG_LEVEL_LOW)) {
			Log.logStr(this, Log.LOG_TYPE_INFO, "startServices()", 
				"Final config: " +f_config);
		}
	}
	/**
	 * 
	 */
	protected void stopServices() {
		Log.logStr(this, Log.LOG_TYPE_INFO, "stopServices()", "Stopping services ...");
		if (f_serviceStarter != null) {
			f_serviceStarter.shutdown();
		}
	}
	/**
	 * Init config.
	 */
	protected void loadConfig() throws ServletException {
		f_config = null;

		String confFile = System.getProperty(PARAM_APP_CONFIG, DEFAULT_APP_CONFIG_FILENAME);

		Log.logStr(this, Log.LOG_TYPE_INFO, "loadConfig()", 
			"Got system parameters: " + PARAM_APP_CONFIG +"=[" +System.getProperty(PARAM_APP_CONFIG) +"]");

		confFile = f_contextBase
				+ (confFile.startsWith(File.separator) ? "" : File.separator)
				+ confFile;

		String[] externalConfSuffixes = getConfigSuffixes();
		try {
			f_config = ConfigFactory.loadConfigFile(confFile, f_contextBase, 
					ConfigFactory.getAlternateConfDir(), ConfigFactory.getLogDir(),
					externalConfSuffixes);
	
		} catch (IOException e) {
			throw new ServletException(e);
		}
	}
	/**
	 * Get webapp config file suffixes
	 */
	public static String[] getConfigSuffixes() {
		return ConfigFactory.getConfigSuffixes(f_contextName);
	}
	/**
	 * get context directory
	 */
	public static String getContextDir() {
		return f_contextBase;
	}
}