mirror of
https://github.com/Yetangitu/ampache
synced 2025-10-03 17:59:21 +02:00
141 lines
4 KiB
PHP
141 lines
4 KiB
PHP
<?php
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/* vim:set softtabstop=4 shiftwidth=4 expandtab: */
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/**
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*
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* LICENSE: GNU Affero General Public License, version 3 (AGPLv3)
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* Copyright 2001 - 2016 Ampache.org
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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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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*/
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abstract class database_object
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{
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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, $table_name='')
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{
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$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)) {
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return array();
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}
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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 (!$db_results) {
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return array();
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}
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$row = Dba::fetch_assoc($db_results);
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self::add_to_cache($table_name, $id, $row);
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return $row;
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} // get_info
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/**
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* clear_cache
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*/
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public static function clear_cache()
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{
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self::$object_cache = array();
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}
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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, $id)
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{
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// Make sure we've got some parents here before we dive below
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if (!isset(self::$object_cache[$index])) {
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return false;
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}
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return isset(self::$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 retrieve 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, $id)
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{
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// Check if the object is set
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if (isset(self::$object_cache[$index]) && isset(self::$object_cache[$index][$id])) {
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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, $data)
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{
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if (!self::$_enabled) {
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return false;
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}
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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, $id)
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{
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if (isset(self::$object_cache[$index]) && isset(self::$object_cache[$index][$id])) {
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unset(self::$object_cache[$index][$id]);
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}
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} // remove_from_cache
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/**
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* _auto_init
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* Load in the cache settings once so we can avoid function calls
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*/
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public static function _auto_init()
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{
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self::$_enabled = AmpConfig::get('memory_cache');
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} // _auto_init
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} // end database_object
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