alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Tomcat example source code file (SessionListener.java)

This example Tomcat source code file (SessionListener.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

http, httpsessionattributelistener, httpsessionlistener, httpsessionlistener, request, response, servlet, servletcontext, servletcontext, servletcontextlistener, servletcontextlistener, sessionlistener, sessionlistener

The Tomcat SessionListener.java source code

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 listeners;


import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;


/**
 * Example listener for context-related application events, which were
 * introduced in the 2.3 version of the Servlet API.  This listener
 * merely documents the occurrence of such events in the application log
 * associated with our servlet context.
 *
 * @author Craig R. McClanahan
 * @version $Revision: 500674 $ $Date: 2007-01-28 00:15:00 +0100 (dim., 28 janv. 2007) $
 */

public final class SessionListener
    implements ServletContextListener,
	       HttpSessionAttributeListener, HttpSessionListener {


    // ----------------------------------------------------- Instance Variables


    /**
     * The servlet context with which we are associated.
     */
    private ServletContext context = null;


    // --------------------------------------------------------- Public Methods


    /**
     * Record the fact that a servlet context attribute was added.
     *
     * @param event The session attribute event
     */
    public void attributeAdded(HttpSessionBindingEvent event) {

	log("attributeAdded('" + event.getSession().getId() + "', '" +
	    event.getName() + "', '" + event.getValue() + "')");

    }


    /**
     * Record the fact that a servlet context attribute was removed.
     *
     * @param event The session attribute event
     */
    public void attributeRemoved(HttpSessionBindingEvent event) {

	log("attributeRemoved('" + event.getSession().getId() + "', '" +
	    event.getName() + "', '" + event.getValue() + "')");

    }


    /**
     * Record the fact that a servlet context attribute was replaced.
     *
     * @param event The session attribute event
     */
    public void attributeReplaced(HttpSessionBindingEvent event) {

	log("attributeReplaced('" + event.getSession().getId() + "', '" +
	    event.getName() + "', '" + event.getValue() + "')");

    }


    /**
     * Record the fact that this web application has been destroyed.
     *
     * @param event The servlet context event
     */
    public void contextDestroyed(ServletContextEvent event) {

	log("contextDestroyed()");
	this.context = null;

    }


    /**
     * Record the fact that this web application has been initialized.
     *
     * @param event The servlet context event
     */
    public void contextInitialized(ServletContextEvent event) {

	this.context = event.getServletContext();
	log("contextInitialized()");

    }


    /**
     * Record the fact that a session has been created.
     *
     * @param event The session event
     */
    public void sessionCreated(HttpSessionEvent event) {

	log("sessionCreated('" + event.getSession().getId() + "')");

    }


    /**
     * Record the fact that a session has been destroyed.
     *
     * @param event The session event
     */
    public void sessionDestroyed(HttpSessionEvent event) {

	log("sessionDestroyed('" + event.getSession().getId() + "')");

    }


    // -------------------------------------------------------- Private Methods


    /**
     * Log a message to the servlet context application log.
     *
     * @param message Message to be logged
     */
    private void log(String message) {

	if (context != null)
	    context.log("SessionListener: " + message);
	else
	    System.out.println("SessionListener: " + message);

    }

}

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat SessionListener.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.