class.ilAppEventHandler.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2006 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/

class ilAppEventHandler
{
        protected $listener; // [array]
        
        public function __construct()
        {
                $this->initListeners();
        }

        protected function initListeners()
        {
                require_once('./Services/GlobalCache/classes/class.ilGlobalCache.php');
                $ilGlobalCache = ilGlobalCache::getInstance(ilGlobalCache::COMP_EVENTS);
                $cached_listeners = $ilGlobalCache->get('listeners');
                if (is_array($cached_listeners)) {
                        $this->listener = $cached_listeners;

                        return;
                }

                global $ilDB;

                $this->listener = array();

                $sql = "SELECT * FROM il_event_handling".
                        " WHERE type = ".$ilDB->quote("listen", "text");
                $res = $ilDB->query($sql);
                while($row = $ilDB->fetchAssoc($res))
                {
                        $this->listener[$row["id"]][] = $row["component"];
                }

                $ilGlobalCache->set('listeners', $this->listener);
        }



        function raise($a_component, $a_event, $a_parameter = "")
        {
                if (is_array($this->listener[$a_component]))
                {
                        foreach ($this->listener[$a_component] as $listener)
                        {
                                // Allow listeners like Services/WebServices/ECS
                                $last_slash = strripos($listener,'/');
                                $comp = substr($listener,0,$last_slash);
                                $class = 'il'.substr($listener,$last_slash + 1).'AppEventListener';
                                $file = "./".$listener."/classes/class.".$class.".php";
                                
                                // detemine class and file
                                #$comp = explode("/", $listener);
                                #$class = "il".$comp[1]."AppEventListener";
                                #$file = "./".$listener."/classes/class.".$class.".php";
                                
                                // if file exists, call listener
                                if (is_file($file))
                                {
                                        include_once($file);
                                        call_user_func(array($class, 'handleEvent'), $a_component, $a_event, $a_parameter);
                                }
                        }
                }

                // get all event hook plugins and forward the event to them
                include_once("./Services/Component/classes/class.ilPluginAdmin.php");
                $plugins = ilPluginAdmin::getActivePluginsForSlot("Services", "EventHandling", "evhk");
                foreach ($plugins as $pl)
                {
                        $plugin = ilPluginAdmin::getPluginObject("Services", "EventHandling",
                                "evhk", $pl);
                        $plugin->handleEvent($a_component, $a_event, $a_parameter);     
                }
                
        }
}
?>