mirror of
https://github.com/Yetangitu/ampache
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4aa256cb07
Remove misleading, unvetted, or in some cases just plain wrong data. Packages and categories weren't being used correctly. They still aren't.
146 lines
3.8 KiB
PHP
146 lines
3.8 KiB
PHP
<?php
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/* vim:set tabstop=8 softtabstop=8 shiftwidth=8 noexpandtab: */
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/**
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* database_object Class
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*
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*
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* LICENSE: GNU General Public License, version 2 (GPLv2)
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* Copyright (c) 2001 - 2011 Ampache.org All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License v2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* @package Ampache
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* @copyright 2001 - 2011 Ampache.org
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* @license http://opensource.org/licenses/gpl-2.0 GPLv2
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* @link http://www.ampache.org/
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*/
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/**
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* database_object
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*
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* This is a general object that is extended by all of the basic
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* database based objects in ampache. It attempts to do some standard
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* caching for all of the objects to cut down on the database calls
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*
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* @package Ampache
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* @copyright 2001 - 2011 Ampache.org
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* @license http://opensource.org/licenses/gpl-2.0 GPLv2
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* @link http://www.ampache.org/
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* @abstract
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*/
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abstract class database_object {
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private static $object_cache = array();
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// Statistics for debugging
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public static $cache_hit = 0;
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private static $_enabled = false;
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/**
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* get_info
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* retrieves the info from the database and puts it in the cache
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*/
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public function get_info($id,$table_name='') {
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$table_name = $table_name ? Dba::escape($table_name) : Dba::escape(strtolower(get_class($this)));
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// Make sure we've got a real id
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if (!is_numeric($id)) { return array(); }
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if (self::is_cached($table_name,$id)) {
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return self::get_from_cache($table_name,$id);
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}
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$sql = "SELECT * FROM `$table_name` WHERE `id`='$id'";
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$db_results = Dba::read($sql);
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if (!$db_results) { return array(); }
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$row = Dba::fetch_assoc($db_results);
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self::add_to_cache($table_name,$id,$row);
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return $row;
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} // get_info
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/**
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* is_cached
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* this checks the cache to see if the specified object is there
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*/
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public static function is_cached($index,$id) {
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// Make sure we've got some parents here before we dive below
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if (!isset(self::$object_cache[$index])) { return false; }
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return isset(self::$object_cache[$index][$id]);
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} // is_cached
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/**
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* get_from_cache
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* This attempts to retrive the specified object from the cache we've got here
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*/
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public static function get_from_cache($index,$id) {
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// Check if the object is set
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if (isset(self::$object_cache[$index])
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&& isset(self::$object_cache[$index][$id])
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) {
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self::$cache_hit++;
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return self::$object_cache[$index][$id];
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}
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return false;
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} // get_from_cache
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/**
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* add_to_cache
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* This adds the specified object to the specified index in the cache
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*/
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public static function add_to_cache($index,$id,$data) {
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if (!self::$_enabled) { return false; }
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$value = is_null($data) ? false : $data;
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self::$object_cache[$index][$id] = $value;
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} // add_to_cache
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/**
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* remove_from_cache
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* This function clears something from the cache, there are a few places we need to do this
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* in order to have things display correctly
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*/
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public static function remove_from_cache($index,$id) {
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if (isset(self::$object_cache[$index]) && isset(self::$object_cache[$index][$id])) {
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unset(self::$object_cache[$index][$id]);
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}
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} // remove_from_cache
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/**
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* _auto_init
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* Load in the cache settings once so we can avoid function calls
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*/
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public static function _auto_init() {
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self::$_enabled = Config::get('memory_cache');
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} // _auto_init
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} // end database_object
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