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   1  <?php
   2  // +-----------------------------------------------------------------------+
   3  // | Copyright (c) 2002-2003, Richard Heyes                                |
   4  // | All rights reserved.                                                  |
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   7  // | modification, are permitted provided that the following conditions    |
   8  // | are met:                                                              |
   9  // |                                                                       |
  10  // | o Redistributions of source code must retain the above copyright      |
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  14  // |   documentation and/or other materials provided with the distribution.|
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  18  // |                                                                       |
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  30  // |                                                                       |
  31  // +-----------------------------------------------------------------------+
  32  // | Author: Alexey Borzov <avb@php.net>                                  |
  33  // +-----------------------------------------------------------------------+
  34  //
  35  // $Id: Listener.php,v 1.2 2003/10/26 10:28:29 avb Exp $
  36  //
  37  
  38  /**
  39   * This class implements the Observer part of a Subject-Observer
  40   * design pattern. It listens to the events sent by a 
  41   * HTTP_Request or HTTP_Response instance.
  42   *
  43   * @package HTTP_Request
  44   * @author  Alexey Borzov <avb@php.net>
  45   * @version $Revision: 1.2 $
  46   */
  47  class HTTP_Request_Listener 
  48  {
  49     /**
  50      * A listener's identifier
  51      * @var string
  52      */
  53      var $_id;
  54  
  55     /**
  56      * Constructor, sets the object's identifier
  57      *
  58      * @access public
  59      */
  60      function HTTP_Request_Listener()
  61      {
  62          $this->_id = md5(uniqid('http_request_', 1));
  63      }
  64  
  65  
  66     /**
  67      * Returns the listener's identifier
  68      *
  69      * @access public
  70      * @return string
  71      */
  72      function getId()
  73      {
  74          return $this->_id;
  75      }
  76  
  77  
  78     /**
  79      * This method is called when Listener is notified of an event
  80      *
  81      * @access   public
  82      * @param    object  an object the listener is attached to
  83      * @param    string  Event name
  84      * @param    mixed   Additional data
  85      * @abstract
  86      */
  87      function update(&$subject, $event, $data = null)
  88      {
  89          echo "Notified of event: '$event'\n";
  90          if (null !== $data) {
  91              echo "Additional data: ";
  92              var_dump($data);
  93          }
  94      }
  95  }
  96  ?>