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applied some bug fixes
[nucleus-jp/nucleus-jp-ancient.git] / euc / nucleus / libs / MANAGER.php
index bf9585e..330a723 100755 (executable)
-<?php
-/**
-  * Nucleus: PHP/MySQL Weblog CMS (http://nucleuscms.org/) 
-  * Copyright (C) 2002-2004 The Nucleus Group
-  *
-  * 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.
-  * (see nucleus/documentation/index.html#license for more info)
-  *
-  *    This class makes sure each item/weblog/comment object gets requested from
-  * the database only once, by keeping them in a cache. The class also acts as 
-  * a dynamic classloader, loading classes _only_ when they are first needed,
-  * hoping to diminish execution time
-  *
-  * The class is a singleton, meaning that there will be only one object of it
-  * active at all times. The object can be requested using MANAGER::instance()
-  *
-  * $Id: MANAGER.php,v 1.1.1.1 2005-02-28 07:14:12 kimitake Exp $
-  */
-class MANAGER {
-
-       /**
-        * Cached ITEM, BLOG, PLUGIN and KARMA objects. When these objects are requested 
-        * through the global $manager object (getItem, getBlog, ...), only the first call 
-        * will create an object. Subsequent calls will return the same object.
-        *
-        * The $items, $blogs, ... arrays map an id to an object (for plugins, the name is used
-        * rather than an ID)
-        */
-       var $items;
-       var $blogs;
-       var $plugins;
-       var $karma;
-       var $templates;
-       
-       /**
-        * cachedInfo to avoid repeated SQL queries (see pidInstalled/pluginInstalled/getPidFromName)
-        * e.g. which plugins exists?
-        *
-        * $cachedInfo['installedPlugins'] = array($pid -> $name)
-        */
-       var $cachedInfo;
-       
-       /**
-         * The plugin subscriptionlist
-         *
-         * The subcription array has the following structure
-         *             $subscriptions[$EventName] = array containing names of plugin classes to be
-         *                                                                      notified when that event happens
-         */
-       var $subscriptions;     
-       
-       /**
-         * Returns the only instance of this class. Creates the instance if it 
-         * does not yet exists. Users should use this function as 
-         * $manager =& MANAGER::instance(); to get a reference to the object
-         * instead of a copy
-         */
-       function &instance() {
-               static $instance = '';
-               if ($instance == '')
-                       $instance =& new MANAGER();
-               return $instance;
-       }
-       
-       /**
-         * The constructor of this class initializes the object caches 
-         */
-       function MANAGER() {
-               $this->items = array();
-               $this->blogs = array();
-               $this->plugins = array();
-               $this->karma = array();
-               $this->parserPrefs = array();
-               $this->cachedInfo = array();
-       }
-       
-       /**
-         * Returns the requested item object. If it is not in the cache, it will
-         * first be loaded and then placed in the cache.
-         * Intended use: $item =& $manager->getItem(1234)
-         */
-       function &getItem($itemid, $allowdraft, $allowfuture) {
-               $item =& $this->items[$itemid];
-               
-               // check the draft and future rules if the item was already cached 
-               if ($item) {
-                       if ((!$allowdraft) && ($item['draft']))
-                               return 0;
-
-                       $blog =& $this->getBlog(getBlogIDFromItemID($itemid));
-                       if ((!$allowfuture) && ($item['timestamp'] > $blog->getCorrectTime()))
-                               return 0;                               
-               }
-               if (!$item) {
-                       // load class if needed
-                       $this->loadClass('ITEM');
-                       // load item object
-                       $item = ITEM::getitem($itemid, $allowdraft, $allowfuture);
-                       $this->items[$itemid] = $item;
-               }
-               return $item;
-       }
-       
-       /**
-         * Loads a class if it has not yet been loaded
-         */
-       function loadClass($name) {
-               $this->_loadClass($name, $name . '.php');
-       }
-       
-       /**
-         * Checks if an item exists
-         */
-       function existsItem($id,$future,$draft) {
-               $this->_loadClass('ITEM','ITEM.php');   
-               return ITEM::exists($id,$future,$draft);
-       }
-       
-       /**
-         * Checks if a category exists
-         */
-       function existsCategory($id) {
-               return (quickQuery('SELECT COUNT(*) as result FROM '.sql_table('category').' WHERE catid='.intval($id)) > 0);
-       }
-       
-       function &getBlog($blogid) {
-               $blog =& $this->blogs[$blogid];
-
-               if (!$blog) {
-                       // load class if needed
-                       $this->_loadClass('BLOG','BLOG.php');
-                       // load blog object
-                       $blog =& new BLOG($blogid);
-                       $this->blogs[$blogid] =& $blog;
-               }
-               return $blog;
-       }
-       
-       function existsBlog($name) {
-               $this->_loadClass('BLOG','BLOG.php');
-               return BLOG::exists($name);
-       }
-
-       function existsBlogID($id) {
-               $this->_loadClass('BLOG','BLOG.php');
-               return BLOG::existsID($id);
-       }       
-       
-       /**
-        * Returns a previously read template
-        */
-       function &getTemplate($templateName) {
-               $template =& $this->templates[$templateName];
-
-               if (!$template) {
-                       $template = TEMPLATE::read($templateName);
-                       $this->templates[$templateName] =& $template;
-               }
-               return $template;
-       }       
-
-       /**
-        * Returns a KARMA object (karma votes)
-        */
-       function &getKarma($itemid) {
-               $karma =& $this->karma[$itemid];
-
-               if (!$karma) {
-                       // load class if needed
-                       $this->_loadClass('KARMA','KARMA.php');
-                       // create KARMA object
-                       $karma =& new KARMA($itemid);
-                       $this->karma[$itemid] =& $karma;
-               }
-               return $karma;
-       }       
-       
-       /**
-        * Global parser preferences
-        */
-       function setParserProperty($name, $value) {
-               $this->parserPrefs[$name] = $value;
-       }
-       function getParserProperty($name) {
-               return $this->parserPrefs[$name];
-       }
-
-       /**
-         * A private helper class to load classes
-         */
-       function _loadClass($name, $filename) {
-               if (!class_exists($name)) {
-                               global $DIR_LIBS;
-                               include($DIR_LIBS . $filename);
-               }       
-       }
-       
-       function _loadPlugin($name) {
-               if (!class_exists($name)) {
-                               global $DIR_PLUGINS;
-                               
-                               $fileName = $DIR_PLUGINS . $name . '.php';
-                               
-                               if (!file_exists($fileName))
-                               {
-                                       ACTIONLOG::add(WARNING, 'Plugin ' . $name . ' was not loaded (File not found)');
-                                       return 0;
-                               }
-                               
-                               // load plugin
-                               include($fileName);
-                               
-                               // check if class exists (avoid errors in eval'd code)
-                               if (!class_exists($name))
-                               {
-                                       ACTIONLOG::add(WARNING, 'Plugin ' . $name . ' was not loaded (Class not found in file, possible parse error)');                         
-                                       return 0;
-                               }
-                               
-                               // add to plugin array
-                               eval('$this->plugins[$name] =& new ' . $name . '();');
-                               
-                               // get plugid
-                               $this->plugins[$name]->plugid = $this->getPidFromName($name);
-                               
-                               // unload plugin if a prefix is used and the plugin cannot handle this^
-                               global $MYSQL_PREFIX;
-                               if (($MYSQL_PREFIX != '') && !$this->plugins[$name]->supportsFeature('SqlTablePrefix')) 
-                               {
-                                       unset($this->plugins[$name]);
-                                       ACTIONLOG::add(WARNING, 'Plugin ' . $name . ' was not loaded (does not support SqlTablePrefix)');
-                                       return 0;
-                               }
-                               
-                               // call init method
-                               $this->plugins[$name]->init();
-                               
-               }       
-       }
-       
-       function &getPlugin($name) {
-               $plugin =& $this->plugins[$name];
-
-               if (!$plugin) {
-                       // load class if needed
-                       $this->_loadPlugin($name);
-                       $plugin =& $this->plugins[$name];                       
-               }
-               return $plugin;
-       }
-
-       /**
-         * checks if the given plugin IS installed or not
-         */
-       function pluginInstalled($name) {
-               $this->_initCacheInfo('installedPlugins');
-               return ($this->getPidFromName($name) != -1);
-       }
-       function pidInstalled($pid) {
-               $this->_initCacheInfo('installedPlugins');
-               return ($this->cachedInfo['installedPlugins'][$pid] != '');
-       }
-       function getPidFromName($name) {
-               $this->_initCacheInfo('installedPlugins');
-               foreach ($this->cachedInfo['installedPlugins'] as $pid => $pfile)
-               {
-                       if ($pfile == $name)
-                               return $pid;
-               }
-               return -1;
-       }
-       function clearCachedInfo($what) {
-               unset($this->cachedInfo[$what]);
-       }
-       
-       /**
-        * Loads some info on the first call only
-        */
-       function _initCacheInfo($what)
-       {
-               if (is_array($this->cachedInfo[$what]))
-                       return;
-               switch ($what)
-               {
-                       // 'installedPlugins' = array ($pid => $name)
-                       case 'installedPlugins':
-                               $this->cachedInfo['installedPlugins'] = array();
-                               $res = sql_query('SELECT pid, pfile FROM ' . sql_table('plugin'));
-                               while ($o = mysql_fetch_object($res))
-                               {
-                                       $this->cachedInfo['installedPlugins'][$o->pid] = $o->pfile;
-                               }
-                               break;
-               }
-       }
-       
-       /**
-         * A function to notify plugins that something has happened. Only the plugins
-         * that are subscribed to the event will get notified.
-         * Upon the first call, the list of subscriptions will be fetched from the 
-         * database. The plugins itsself will only get loaded when they are first needed
-         *
-         * @param $eventName
-         *             Name of the event (method to be called on plugins)
-         * @param $data
-         *             Can contain any type of data, depending on the event type. Usually this is
-         *             an itemid, blogid, ... but it can also be an array containing multiple values
-         */
-       function notify($eventName, $data) {
-               // load subscription list if needed
-               if (!is_array($this->subscriptions)) 
-                       $this->_loadSubscriptions();
-                       
-
-               // get listening objects
-               $listeners = $this->subscriptions[$eventName];
-               
-               // notify all of them
-               if (is_array($listeners)) {
-                       foreach($listeners as $listener) {
-                               // load class if needed
-                               $this->_loadPlugin($listener);
-                               // do notify (if method exists)
-                               if (method_exists($this->plugins[$listener], 'event_' . $eventName))
-                                       call_user_func(array(&$this->plugins[$listener],'event_' . $eventName), $data);
-                       }
-               }
-               
-       }
-       
-       /**
-         * Loads plugin subscriptions
-         */
-       function _loadSubscriptions() {
-               // initialize as array
-               $this->subscriptions = array();
-
-               $res = sql_query('SELECT p.pfile as pfile, e.event as event FROM '.sql_table('plugin_event').' as e, '.sql_table('plugin').' as p WHERE e.pid=p.pid ORDER BY p.porder ASC');
-               while ($o = mysql_fetch_object($res)) {
-                       $pluginName = $o->pfile;
-                       $eventName = $o->event;
-                       $this->subscriptions[$eventName][] = $pluginName;
-               }
-               
-       }
-
-       /*
-               Ticket functions. These are uses by the admin area to make it impossible to simulate certain GET/POST
-               requests. tickets are user specific
-       */
-
-       var $currentRequestTicket = '';
-       
-       /**
-        * GET requests: Adds ticket to URL (URL should NOT be html-encoded!, ticket is added at the end)
-        */
-       function addTicketToUrl($url)
-       {
-               $ticketCode = 'ticket=' . $this->_generateTicket();
-               if (strstr($url, '?'))
-                       return $url . '&' . $ticketCode;
-               else 
-                       return $url . '?' . $ticketCode;
-       }
-       
-       /**
-        * POST requests: Adds ticket as hidden formvar
-        */
-       function addTicketHidden()
-       {
-               $ticket = $this->_generateTicket();
-               
-               echo '<input type="hidden" name="ticket" value="', htmlspecialchars($ticket), '" />';
-       }
-       
-       /**
-        * Checks the ticket that was passed along with the current request
-        */
-       function checkTicket() 
-       {
-               global $member;
-               
-               // get ticket from request
-               $ticket = requestVar('ticket');
-               
-               // no ticket -> don't allow
-               if ($ticket == '')
-                       return false;
-                       
-               // remove expired tickets first
-               $this->_cleanUpExpiredTickets();
-               
-               // get member id
-               if (!$member->isLoggedIn())
-                       $memberId = -1;
-               else
-                       $memberId = $member->getID();
-               
-               // check if ticket is a valid one
-               $query = 'SELECT COUNT(*) as result FROM ' . sql_table('tickets') . ' WHERE member=' . intval($memberId). ' and ticket=\''.addslashes($ticket).'\'';
-               if (quickQuery($query) == 1)
-               {
-                       // [in the original implementation, the checked ticket was deleted. This would lead to invalid
-                       //  tickets when using the browsers back button and clicking another link/form
-                       //  leaving the keys in the database is not a real problem, since they're member-specific and 
-                       //  only valid for a period of one hour
-                       // ]
-                       // sql_query('DELETE FROM '.sql_table('tickets').' WHERE member=' . intval($memberId). ' and ticket=\''.addslashes($ticket).'\'');
-                       return true;                    
-               } else {
-                       // not a valid ticket
-                       return false;
-               }
-
-       }
-       
-       /**
-        * (internal method) Removes the expired tickets 
-        */
-       function _cleanUpExpiredTickets()
-       {
-               // remove tickets older than 1 hour
-               $oldTime = time() - 60 * 60;
-               $query = 'DELETE FROM ' . sql_table('tickets'). ' WHERE ctime < \'' . date('Y-m-d H:i:s',$oldTime) .'\'';
-               sql_query($query);
-       }
-
-       /**
-        * (internal method) Generates/returns a ticket (one ticket per page request)
-        */
-       function _generateTicket()
-       {
-               if ($this->currentRequestTicket == '')
-               {
-                       // generate new ticket (only one ticket will be generated per page request)
-                       // and store in database 
-                       global $member;
-                       // get member id
-                       if (!$member->isLoggedIn())
-                               $memberId = -1;
-                       else
-                               $memberId = $member->getID();
-                       
-                       $ok = false;
-                       while (!$ok)
-                       {
-                               // generate a random token
-                               srand((double)microtime()*1000000);
-                               $ticket = md5(uniqid(rand(), true));
-
-                               // add in database as non-active
-                               $query = 'INSERT INTO ' . sql_table('tickets') . ' (ticket, member, ctime) ';
-                               $query .= 'VALUES (\'' . addslashes($ticket). '\', \'' . intval($memberId). '\', \'' . date('Y-m-d H:i:s',time()) . '\')';
-                               if (sql_query($query))
-                                       $ok = true;
-                       }
-                       
-                       $this->currentRequestTicket = $ticket;
-               }
-               return $this->currentRequestTicket;
-       }
-       
-}
-
+<?php\r
+/**\r
+  * Nucleus: PHP/MySQL Weblog CMS (http://nucleuscms.org/) \r
+  * Copyright (C) 2002-2004 The Nucleus Group\r
+  *\r
+  * This program is free software; you can redistribute it and/or\r
+  * modify it under the terms of the GNU General Public License\r
+  * as published by the Free Software Foundation; either version 2\r
+  * of the License, or (at your option) any later version.\r
+  * (see nucleus/documentation/index.html#license for more info)\r
+  *\r
+  *    This class makes sure each item/weblog/comment object gets requested from\r
+  * the database only once, by keeping them in a cache. The class also acts as \r
+  * a dynamic classloader, loading classes _only_ when they are first needed,\r
+  * hoping to diminish execution time\r
+  *\r
+  * The class is a singleton, meaning that there will be only one object of it\r
+  * active at all times. The object can be requested using MANAGER::instance()\r
+  */\r
+class MANAGER {\r
+\r
+       /**\r
+        * Cached ITEM, BLOG, PLUGIN and KARMA objects. When these objects are requested \r
+        * through the global $manager object (getItem, getBlog, ...), only the first call \r
+        * will create an object. Subsequent calls will return the same object.\r
+        *\r
+        * The $items, $blogs, ... arrays map an id to an object (for plugins, the name is used\r
+        * rather than an ID)\r
+        */\r
+       var $items;\r
+       var $blogs;\r
+       var $plugins;\r
+       var $karma;\r
+       \r
+       /**\r
+        * cachedInfo to avoid repeated SQL queries (see pidInstalled/pluginInstalled/getPidFromName)\r
+        * e.g. which plugins exists?\r
+        *\r
+        * $cachedInfo['installedPlugins'] = array($pid -> $name)\r
+        */\r
+       var $cachedInfo;\r
+       \r
+       /**\r
+         * The plugin subscriptionlist\r
+         *\r
+         * The subcription array has the following structure\r
+         *             $subscriptions[$EventName] = array containing names of plugin classes to be\r
+         *                                                                      notified when that event happens\r
+         */\r
+       var $subscriptions;     \r
+       \r
+       /**\r
+         * Returns the only instance of this class. Creates the instance if it \r
+         * does not yet exists. Users should use this function as \r
+         * $manager =& MANAGER::instance(); to get a reference to the object\r
+         * instead of a copy\r
+         */\r
+       function &instance() {\r
+               static $instance = '';\r
+               if ($instance == '')\r
+                       $instance = new MANAGER();\r
+               return $instance;\r
+       }\r
+       \r
+       /**\r
+         * The constructor of this class initializes the object caches \r
+         */\r
+       function MANAGER() {\r
+               $this->items = array();\r
+               $this->blogs = array();\r
+               $this->plugins = array();\r
+               $this->karma = array();\r
+               $this->parserPrefs = array();\r
+               $this->cachedInfo = array();\r
+       }\r
+       \r
+       /**\r
+         * Returns the requested item object. If it is not in the cache, it will\r
+         * first be loaded and then placed in the cache.\r
+         * Intended use: $item =& $manager->getItem(1234)\r
+         */\r
+       function &getItem($itemid, $allowdraft, $allowfuture) {\r
+               $item =& $this->items[$itemid];\r
+               \r
+               // check the draft and future rules if the item was already cached \r
+               if ($item) {\r
+                       if ((!$allowdraft) && ($item['draft']))\r
+                               return 0;\r
+\r
+                       $blog =& $this->getBlog(getBlogIDFromItemID($itemid));\r
+                       if ((!$allowfuture) && ($item['timestamp'] > $blog->getCorrectTime()))\r
+                               return 0;                               \r
+               }\r
+               if (!$item) {\r
+                       // load class if needed\r
+                       $this->loadClass('ITEM');\r
+                       // load item object\r
+                       $item = ITEM::getitem($itemid, $allowdraft, $allowfuture);\r
+                       $this->items[$itemid] = $item;\r
+               }\r
+               return $item;\r
+       }\r
+       \r
+       /**\r
+         * Loads a class if it has not yet been loaded\r
+         */\r
+       function loadClass($name) {\r
+               $this->_loadClass($name, $name . '.php');\r
+       }\r
+       \r
+       /**\r
+         * Checks if an item exists\r
+         */\r
+       function existsItem($id,$future,$draft) {\r
+               $this->_loadClass('ITEM','ITEM.php');   \r
+               return ITEM::exists($id,$future,$draft);\r
+       }\r
+       \r
+       /**\r
+         * Checks if a category exists\r
+         */\r
+       function existsCategory($id) {\r
+               return (quickQuery('SELECT COUNT(*) as result FROM '.sql_table('category').' WHERE catid='.intval($id)) > 0);\r
+       }\r
+       \r
+       function &getBlog($blogid) {\r
+               $blog =& $this->blogs[$blogid];\r
+\r
+               if (!$blog) {\r
+                       // load class if needed\r
+                       $this->_loadClass('BLOG','BLOG.php');\r
+                       // load blog object\r
+                       $blog = new BLOG($blogid);\r
+                       $this->blogs[$blogid] = $blog;\r
+               }\r
+               return $blog;\r
+       }\r
+       \r
+       function existsBlog($name) {\r
+               $this->_loadClass('BLOG','BLOG.php');\r
+               return BLOG::exists($name);\r
+       }\r
+\r
+       function existsBlogID($id) {\r
+               $this->_loadClass('BLOG','BLOG.php');\r
+               return BLOG::existsID($id);\r
+       }       \r
+       \r
+       /**\r
+        * Returns a KARMA object (karma votes)\r
+        */\r
+       function &getKarma($itemid) {\r
+               $karma =& $this->karma[$itemid];\r
+\r
+               if (!$karma) {\r
+                       // load class if needed\r
+                       $this->_loadClass('KARMA','KARMA.php');\r
+                       // create KARMA object\r
+                       $karma = new KARMA($itemid);\r
+                       $this->karma[$itemid] = $karma;\r
+               }\r
+               return $karma;\r
+       }       \r
+       \r
+       /**\r
+        * Global parser preferences\r
+        */\r
+       function setParserProperty($name, $value) {\r
+               $this->parserPrefs[$name] = $value;\r
+       }\r
+       function getParserProperty($name) {\r
+               return $this->parserPrefs[$name];\r
+       }\r
+\r
+       /**\r
+         * A private helper class to load classes\r
+         */\r
+       function _loadClass($name, $filename) {\r
+               if (!class_exists($name)) {\r
+                               global $DIR_LIBS;\r
+                               include($DIR_LIBS . $filename);\r
+               }       \r
+       }\r
+       \r
+       function _loadPlugin($name) {\r
+               if (!class_exists($name)) {\r
+                               global $DIR_PLUGINS;\r
+                               \r
+                               $fileName = $DIR_PLUGINS . $name . '.php';\r
+                               \r
+                               if (!file_exists($fileName))\r
+                               {\r
+                                       ACTIONLOG::add(WARNING, 'Plugin ' . $name . ' was not loaded (File not found)');\r
+                                       return 0;\r
+                               }\r
+                               \r
+                               // load plugin\r
+                               include($fileName);\r
+                               \r
+                               // check if class exists (avoid errors in eval'd code)\r
+                               if (!class_exists($name))\r
+                               {\r
+                                       ACTIONLOG::add(WARNING, 'Plugin ' . $name . ' was not loaded (Class not found in file, possible parse error)');                         \r
+                                       return 0;\r
+                               }\r
+                               \r
+                               // add to plugin array\r
+                               eval('$this->plugins[$name] = new ' . $name . '();');\r
+                               \r
+                               // get plugid\r
+                               $this->plugins[$name]->plugid = $this->getPidFromName($name);\r
+                               \r
+                               // unload plugin if a prefix is used and the plugin cannot handle this^\r
+                               global $MYSQL_PREFIX;\r
+                               if (($MYSQL_PREFIX != '') && !$this->plugins[$name]->supportsFeature('SqlTablePrefix')) \r
+                               {\r
+                                       unset($this->plugins[$name]);\r
+                                       ACTIONLOG::add(WARNING, 'Plugin ' . $name . ' was not loaded (does not support SqlTablePrefix)');\r
+                                       return 0;\r
+                               }\r
+                               \r
+                               // call init method\r
+                               $this->plugins[$name]->init();\r
+                               \r
+               }       \r
+       }\r
+       \r
+       function &getPlugin($name) {\r
+               $plugin =& $this->plugins[$name];\r
+\r
+               if (!$plugin) {\r
+                       // load class if needed\r
+                       $this->_loadPlugin($name);\r
+                       $plugin =& $this->plugins[$name];                       \r
+               }\r
+               return $plugin;\r
+       }\r
+\r
+       /**\r
+         * checks if the given plugin IS installed or not\r
+         */\r
+       function pluginInstalled($name) {\r
+               $this->_initCacheInfo('installedPlugins');\r
+               return ($this->getPidFromName($name) != -1);\r
+       }\r
+       function pidInstalled($pid) {\r
+               $this->_initCacheInfo('installedPlugins');\r
+               return ($this->cachedInfo['installedPlugins'][$pid] != '');\r
+       }\r
+       function getPidFromName($name) {\r
+               $this->_initCacheInfo('installedPlugins');\r
+               foreach ($this->cachedInfo['installedPlugins'] as $pid => $pfile)\r
+               {\r
+                       if ($pfile == $name)\r
+                               return $pid;\r
+               }\r
+               return -1;\r
+       }\r
+       function clearCachedInfo($what) {\r
+               unset($this->cachedInfo[$what]);\r
+       }\r
+       \r
+       /**\r
+        * Loads some info on the first call only\r
+        */\r
+       function _initCacheInfo($what)\r
+       {\r
+               if (is_array($this->cachedInfo[$what]))\r
+                       return;\r
+               switch ($what)\r
+               {\r
+                       // 'installedPlugins' = array ($pid => $name)\r
+                       case 'installedPlugins':\r
+                               $this->cachedInfo['installedPlugins'] = array();\r
+                               $res = sql_query('SELECT pid, pfile FROM ' . sql_table('plugin'));\r
+                               while ($o = mysql_fetch_object($res))\r
+                               {\r
+                                       $this->cachedInfo['installedPlugins'][$o->pid] = $o->pfile;\r
+                               }\r
+                               break;\r
+               }\r
+       }\r
+       \r
+       /**\r
+         * A function to notify plugins that something has happened. Only the plugins\r
+         * that are subscribed to the event will get notified.\r
+         * Upon the first call, the list of subscriptions will be fetched from the \r
+         * database. The plugins itsself will only get loaded when they are first needed\r
+         *\r
+         * @param $eventName\r
+         *             Name of the event (method to be called on plugins)\r
+         * @param $data\r
+         *             Can contain any type of data, depending on the event type. Usually this is\r
+         *             an itemid, blogid, ... but it can also be an array containing multiple values\r
+         */\r
+       function notify($eventName, $data) {\r
+               // load subscription list if needed\r
+               if (!is_array($this->subscriptions)) \r
+                       $this->_loadSubscriptions();\r
+                       \r
+\r
+               // get listening objects\r
+               $listeners = $this->subscriptions[$eventName];\r
+               \r
+               // notify all of them\r
+               if (is_array($listeners)) {\r
+                       foreach($listeners as $listener) {\r
+                               // load class if needed\r
+                               $this->_loadPlugin($listener);\r
+                               // do notify (if method exists)\r
+                               if (method_exists($this->plugins[$listener], 'event_' . $eventName))\r
+                                       call_user_func(array(&$this->plugins[$listener],'event_' . $eventName), $data);\r
+                       }\r
+               }\r
+               \r
+       }\r
+       \r
+       /**\r
+         * Loads plugin subscriptions\r
+         */\r
+       function _loadSubscriptions() {\r
+               // initialize as array\r
+               $this->subscriptions = array();\r
+\r
+               $res = sql_query('SELECT p.pfile as pfile, e.event as event FROM '.sql_table('plugin_event').' as e, '.sql_table('plugin').' as p WHERE e.pid=p.pid ORDER BY p.porder ASC');\r
+               while ($o = mysql_fetch_object($res)) {\r
+                       $pluginName = $o->pfile;\r
+                       $eventName = $o->event;\r
+                       $this->subscriptions[$eventName][] = $pluginName;\r
+               }\r
+               \r
+       }\r
+\r
+       \r
+       \r
+}\r
+\r
 ?>
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