mirror of
https://github.com/phpbb/phpbb.git
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388 lines
6.7 KiB
PHP
388 lines
6.7 KiB
PHP
<?php
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/**
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*
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* @package acm
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* @version $Id$
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* @copyright (c) 2009 phpBB Group
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* @license http://opensource.org/licenses/gpl-license.php GNU Public License
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*
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*/
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/**
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* @ignore
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*/
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if (!defined('IN_PHPBB'))
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{
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exit;
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}
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/**
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* ACM File Based Caching
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* @package acm
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*/
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class acm
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{
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var $vars = array();
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var $is_modified = false;
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var $sql_rowset = array();
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var $sql_row_pointer = array();
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var $cache_dir = '';
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/**
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* Set cache path
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*/
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function acm()
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{
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$this->cache_dir = $phpbb_root_path . 'cache/';
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}
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/**
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* Load global cache
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*/
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function load()
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{
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// grab the global cache
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$this->vars = apc_fetch('global');
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if ($this->vars !== false)
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{
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return true;
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}
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return false;
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}
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/**
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* Unload cache object
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*/
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function unload()
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{
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$this->save();
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unset($this->vars);
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unset($this->sql_rowset);
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unset($this->sql_row_pointer);
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$this->vars = array();
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$this->sql_rowset = array();
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$this->sql_row_pointer = array();
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}
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/**
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* Save modified objects
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*/
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function save()
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{
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if (!$this->is_modified)
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{
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return;
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}
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apc_store('global', $this->vars, 31536000);
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$this->is_modified = false;
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}
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/**
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* Tidy cache
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*/
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function tidy()
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{
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// cache has auto GC, no need to have any code here :)
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set_config('cache_last_gc', time(), true);
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}
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/**
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* Get saved cache object
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*/
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function get($var_name)
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{
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if ($var_name[0] == '_')
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{
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if (!$this->_exists($var_name))
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{
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return false;
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}
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return apc_fetch($var_name);
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}
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else
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{
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return ($this->_exists($var_name)) ? $this->vars[$var_name] : false;
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}
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}
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/**
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* Put data into cache
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*/
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function put($var_name, $var, $ttl = 31536000)
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{
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if ($var_name[0] == '_')
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{
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apc_store($var_name, $var, $ttl);
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}
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else
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{
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$this->vars[$var_name] = $var;
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$this->is_modified = true;
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}
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}
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/**
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* Purge cache data
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*/
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function purge()
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{
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// Purge all phpbb cache files
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$dir = @opendir($this->cache_dir);
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if (!$dir)
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{
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return;
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}
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while (($entry = readdir($dir)) !== false)
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{
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if (strpos($entry, 'sql_') !== 0 && strpos($entry, 'data_') !== 0 && strpos($entry, 'ctpl_') !== 0 && strpos($entry, 'tpl_') !== 0)
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{
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continue;
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}
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$this->remove_file($this->cache_dir . $entry);
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}
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closedir($dir);
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apc_clear_cache('user');
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unset($this->vars);
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unset($this->sql_rowset);
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unset($this->sql_row_pointer);
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$this->vars = array();
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$this->sql_rowset = array();
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$this->sql_row_pointer = array();
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$this->is_modified = false;
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}
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/**
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* Destroy cache data
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*/
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function destroy($var_name, $table = '')
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{
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if ($var_name == 'sql' && !empty($table))
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{
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if (!is_array($table))
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{
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$table = array($table);
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}
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foreach ($table as $table_name)
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{
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// gives us the md5s that we want
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$temp = apc_fetch('sql_' . $table_name);
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if ($temp === false)
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{
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continue;
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}
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// delete each query ref
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foreach ($temp as $md5_id => $void)
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{
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apc_delete('sql_' . $md5_id);
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}
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// delete the table ref
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apc_delete('sql_' . $table_name);
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}
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return;
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}
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if (!$this->_exists($var_name))
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{
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return;
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}
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if ($var_name[0] == '_')
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{
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apc_delete($var_name);
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}
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else if (isset($this->vars[$var_name]))
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{
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$this->is_modified = true;
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unset($this->vars[$var_name]);
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// We save here to let the following cache hits succeed
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$this->save();
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}
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}
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/**
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* Check if a given cache entry exist
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*/
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function _exists($var_name)
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{
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if ($var_name[0] == '_')
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{
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return true;
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}
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else
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{
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if (!sizeof($this->vars))
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{
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$this->load();
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}
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return isset($this->vars[$var_name]);
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}
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}
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/**
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* Load cached sql query
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*/
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function sql_load($query)
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{
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// Remove extra spaces and tabs
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$query = preg_replace('/[\n\r\s\t]+/', ' ', $query);
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$query_id = sizeof($this->sql_rowset);
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$temp = apc_fetch('sql_' . md5($query));
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if ($temp === false)
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{
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return false;
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}
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$this->sql_rowset[$query_id] = $temp;
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$this->sql_row_pointer[$query_id] = 0;
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return $query_id;
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}
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/**
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* Save sql query
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*/
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function sql_save($query, &$query_result, $ttl)
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{
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// Remove extra spaces and tabs
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$query = preg_replace('/[\n\r\s\t]+/', ' ', $query);
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// determine which tables this query belongs to
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preg_match('/FROM \\(?(\\w+(?: \\w+)?(?:, ?\\w+(?: \\w+)?)*)\\)?/', $query, $regs);
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$tables = array_map('trim', explode(',', $regs[1]));
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foreach ($tables as $table_name)
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{
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if (($pos = strpos($table_name, ' ')) !== false)
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{
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$table_name = substr($table_name, 0, $pos);
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}
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$temp = apc_fetch('sql_' . $table_name);
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if ($temp === false)
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{
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$temp = array();
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}
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$temp[md5($query)] = true;
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apc_store('sql_' . $table_name, $temp, $ttl);
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}
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// store them in the right place
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$query_id = sizeof($this->sql_rowset);
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$this->sql_rowset[$query_id] = array();
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$this->sql_row_pointer[$query_id] = 0;
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while ($row = phpbb::$db->sql_fetchrow($query_result))
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{
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$this->sql_rowset[$query_id][] = $row;
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}
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phpbb::$db->sql_freeresult($query_result);
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apc_store('sql_' . md5($query), $this->sql_rowset[$query_id], $ttl);
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$query_result = $query_id;
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}
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/**
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* Ceck if a given sql query exist in cache
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*/
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function sql_exists($query_id)
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{
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return isset($this->sql_rowset[$query_id]);
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}
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/**
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* Fetch row from cache (database)
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*/
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function sql_fetchrow($query_id)
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{
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if ($this->sql_row_pointer[$query_id] < sizeof($this->sql_rowset[$query_id]))
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{
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return $this->sql_rowset[$query_id][$this->sql_row_pointer[$query_id]++];
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}
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return false;
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}
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/**
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* Fetch a field from the current row of a cached database result (database)
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*/
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function sql_fetchfield($query_id, $field)
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{
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if ($this->sql_row_pointer[$query_id] < sizeof($this->sql_rowset[$query_id]))
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{
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return (isset($this->sql_rowset[$query_id][$this->sql_row_pointer[$query_id]][$field])) ? $this->sql_rowset[$query_id][$this->sql_row_pointer[$query_id]][$field] : false;
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}
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return false;
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}
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/**
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* Seek a specific row in an a cached database result (database)
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*/
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function sql_rowseek($rownum, $query_id)
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{
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if ($rownum >= sizeof($this->sql_rowset[$query_id]))
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{
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return false;
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}
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$this->sql_row_pointer[$query_id] = $rownum;
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return true;
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}
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/**
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* Free memory used for a cached database result (database)
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*/
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function sql_freeresult($query_id)
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{
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if (!isset($this->sql_rowset[$query_id]))
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{
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return false;
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}
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unset($this->sql_rowset[$query_id]);
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unset($this->sql_row_pointer[$query_id]);
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return true;
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}
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/**
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* Removes/unlinks file
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*/
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function remove_file($filename, $check = false)
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{
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if ($check && !@is_writable($this->cache_dir))
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{
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// E_USER_ERROR - not using language entry - intended.
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trigger_error('Unable to remove files within ' . $this->cache_dir . '. Please check directory permissions.', E_USER_ERROR);
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}
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return @unlink($filename);
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}
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}
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?>
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