httpsessioninspector.java

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package itso.basicweb.listener;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

/**
 * @version 	1.0
 * @author
 */
public class HttpSessionInspector
	implements HttpSessionListener, HttpSessionAttributeListener {

	/**
	* @see javax.servlet.http.HttpSessionAttributeListener#void (javax.servlet.http.HttpSessionBindingEvent)
	*/
	public void attributeRemoved(HttpSessionBindingEvent arg0) {
		report ("Attribute " + arg0.getName() + " removed", arg0.getSession(), arg0.getValue());
	}

	/**
	* @see javax.servlet.http.HttpSessionListener#void (javax.servlet.http.HttpSessionEvent)
	*/
	public void sessionDestroyed(HttpSessionEvent arg0) {
		report ("Session destroyed", arg0.getSession(), null); 
	}

	/**
	* @see javax.servlet.http.HttpSessionAttributeListener#void (javax.servlet.http.HttpSessionBindingEvent)
	*/
	public void attributeAdded(HttpSessionBindingEvent arg0) {
		report ("Attribute " + arg0.getName() + " added", arg0.getSession(), arg0.getValue());
	}

	/**
	* @see javax.servlet.http.HttpSessionAttributeListener#void (javax.servlet.http.HttpSessionBindingEvent)
	*/
	public void attributeReplaced(HttpSessionBindingEvent arg0) {
		report ("Attribute " + arg0.getName() + " replaced", arg0.getSession(), arg0.getValue());
	}

	/**
	* @see javax.servlet.http.HttpSessionListener#void (javax.servlet.http.HttpSessionEvent)
	*/
	public void sessionCreated(HttpSessionEvent arg0) {
		report ("Session created", arg0.getSession(), null); 
	}

	// helper methods
	private int size (Object anObject) {
		ByteArrayOutputStream array = new ByteArrayOutputStream ();
		try {
			(new ObjectOutputStream (array)).writeObject(anObject);
			return array.size();
		} catch (IOException e) {
			return -1;
		}
	}

	private void report (String reason, HttpSession session, Object value) {
		if (value == null) 
			System.out.println (reason + ": session #" + session.hashCode() + " size: " + size(session));
		else
			System.out.println (reason + ": session #" + session.hashCode() + " size: " + size(session) +
					" Attribute size: " + size(value));
	}
	
}