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File: Listener.php
<?php
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// | Copyright (c) 2002-2003, Richard Heyes                                |
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// +-----------------------------------------------------------------------+
// | Author: Alexey Borzov <avb@php.net>                                  |
// +-----------------------------------------------------------------------+
//
// $Id: Listener.php,v 1.2 2003/10/26 10:28:29 avb Exp $
//

/**
 * This class implements the Observer part of a Subject-Observer
 * design pattern. It listens to the events sent by a 
 * HTTP_Request or HTTP_Response instance.
 *
 * @package HTTP_Request
 * @author  Alexey Borzov <avb@php.net>
 * @version $Revision: 1.2 $
 */
class HTTP_Request_Listener 
{
   /**
    * A listener's identifier
    * @var string
    */
    var $_id;

   /**
    * Constructor, sets the object's identifier
    *
    * @access public
    */
    function HTTP_Request_Listener()
    {
        $this->_id = md5(uniqid('http_request_', 1));
    }


   /**
    * Returns the listener's identifier
    *
    * @access public
    * @return string
    */
    function getId()
    {
        return $this->_id;
    }


   /**
    * This method is called when Listener is notified of an event
    *
    * @access   public
    * @param    object  an object the listener is attached to
    * @param    string  Event name
    * @param    mixed   Additional data
    * @abstract
    */
    function update(&$subject, $event, $data = null)
    {
        echo "Notified of event: '$event'\n";
        if (null !== $data) {
            echo "Additional data: ";
            var_dump($data);
        }
    }
}
?>