/**********************************************************************************
 * $URL: https://source.sakaiproject.org/svn/component/tags/sakai_2-3-1/component-api/component/src/java/org/sakaiproject/util/ContextLoaderListener.java $
 * $Id: ContextLoaderListener.java 6821 2006-03-21 18:34:36Z ggolden@umich.edu $
 ***********************************************************************************
 *
 * Copyright (c) 2003, 2004, 2005, 2006 The Sakai Foundation.
 * 
 * Licensed under the Educational Community License, Version 1.0 (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.opensource.org/licenses/ecl1.php
 * 
 * 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 org.sakaiproject.util;

import javax.servlet.ServletContextEvent;

import org.sakaiproject.component.cover.ComponentManager;
import org.sakaiproject.component.impl.ContextLoader;
import org.sakaiproject.component.impl.SpringCompMgr;

/**
 * <p>
 * Sakai's extension to the Spring ContextLoaderListener - use our ContextLoader, and increment / decrement the child count of the ComponentManager on init / destroy.
 * </p>
 */
public class ContextLoaderListener extends org.springframework.web.context.ContextLoaderListener
{
	/**
	 * Create the ContextLoader to use. Can be overridden in subclasses.
	 * 
	 * @return the new ContextLoader
	 */
	protected org.springframework.web.context.ContextLoader createContextLoader()
	{
		return new ContextLoader();
	}

	/**
	 * Initialize the root web application context.
	 */
	public void contextInitialized(ServletContextEvent event)
	{
		super.contextInitialized(event);

		// increment the count of children for the component manager
		((SpringCompMgr) ComponentManager.getInstance()).addChildAc();
	}

	/**
	 * Close the root web application context.
	 */
	public void contextDestroyed(ServletContextEvent event)
	{
		super.contextDestroyed(event);

		// decrement the count of children for the component manager
		((SpringCompMgr) ComponentManager.getInstance()).removeChildAc();
	}
}
