diff options
Diffstat (limited to 'phpBB/includes/cache/driver/memory.php')
| -rw-r--r-- | phpBB/includes/cache/driver/memory.php | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/phpBB/includes/cache/driver/memory.php b/phpBB/includes/cache/driver/memory.php new file mode 100644 index 0000000000..633a0fe699 --- /dev/null +++ b/phpBB/includes/cache/driver/memory.php @@ -0,0 +1,437 @@ +<?php +/** +* +* @package acm +* @version $Id$ +* @copyright (c) 2005 phpBB Group +* @license http://opensource.org/licenses/gpl-license.php GNU Public License +* +*/ + +/** +* @ignore +*/ +if (!defined('IN_PHPBB')) +{ + exit; +} + +/** +* ACM Abstract Memory Class +* @package acm +*/ +class phpbb_cache_driver_memory extends phpbb_cache_driver_base +{ + var $key_prefix; + + var $vars = array(); + var $is_modified = false; + + var $sql_rowset = array(); + var $sql_row_pointer = array(); + var $cache_dir = ''; + + /** + * Set cache path + */ + function __construct() + { + global $phpbb_root_path, $dbname, $table_prefix; + + $this->cache_dir = $phpbb_root_path . 'cache/'; + $this->key_prefix = substr(md5($dbname . $table_prefix), 0, 8) . '_'; + + if (!isset($this->extension) || !extension_loaded($this->extension)) + { + global $acm_type; + + trigger_error("Could not find required extension [{$this->extension}] for the ACM module $acm_type.", E_USER_ERROR); + } + + if (isset($this->function) && !function_exists($this->function)) + { + global $acm_type; + + trigger_error("The required function [{$this->function}] is not available for the ACM module $acm_type.", E_USER_ERROR); + } + } + + /** + * Load global cache + */ + function load() + { + // grab the global cache + $this->vars = $this->_read('global'); + + if ($this->vars !== false) + { + return true; + } + + return false; + } + + /** + * Unload cache object + */ + function unload() + { + $this->save(); + unset($this->vars); + unset($this->sql_rowset); + unset($this->sql_row_pointer); + + $this->vars = array(); + $this->sql_rowset = array(); + $this->sql_row_pointer = array(); + } + + /** + * Save modified objects + */ + function save() + { + if (!$this->is_modified) + { + return; + } + + $this->_write('global', $this->vars, 2592000); + + $this->is_modified = false; + } + + /** + * Tidy cache + */ + function tidy() + { + // cache has auto GC, no need to have any code here :) + + set_config('cache_last_gc', time(), true); + } + + /** + * Get saved cache object + */ + function get($var_name) + { + if ($var_name[0] == '_') + { + if (!$this->_exists($var_name)) + { + return false; + } + + return $this->_read($var_name); + } + else + { + return ($this->_exists($var_name)) ? $this->vars[$var_name] : false; + } + } + + /** + * Put data into cache + */ + function put($var_name, $var, $ttl = 2592000) + { + if ($var_name[0] == '_') + { + $this->_write($var_name, $var, $ttl); + } + else + { + $this->vars[$var_name] = $var; + $this->is_modified = true; + } + } + + /** + * Purge cache data + */ + function purge() + { + // Purge all phpbb cache files + $dir = @opendir($this->cache_dir); + + if (!$dir) + { + return; + } + + while (($entry = readdir($dir)) !== false) + { + if (strpos($entry, 'sql_') !== 0 && strpos($entry, 'data_') !== 0 && strpos($entry, 'ctpl_') !== 0 && strpos($entry, 'tpl_') !== 0) + { + continue; + } + + $this->remove_file($this->cache_dir . $entry); + } + closedir($dir); + + unset($this->vars); + unset($this->sql_rowset); + unset($this->sql_row_pointer); + + $this->vars = array(); + $this->sql_rowset = array(); + $this->sql_row_pointer = array(); + + $this->is_modified = false; + } + + + /** + * Destroy cache data + */ + function destroy($var_name, $table = '') + { + if ($var_name == 'sql' && !empty($table)) + { + if (!is_array($table)) + { + $table = array($table); + } + + foreach ($table as $table_name) + { + // gives us the md5s that we want + $temp = $this->_read('sql_' . $table_name); + + if ($temp === false) + { + continue; + } + + // delete each query ref + foreach ($temp as $md5_id => $void) + { + $this->_delete('sql_' . $md5_id); + } + + // delete the table ref + $this->_delete('sql_' . $table_name); + } + + return; + } + + if (!$this->_exists($var_name)) + { + return; + } + + if ($var_name[0] == '_') + { + $this->_delete($var_name); + } + else if (isset($this->vars[$var_name])) + { + $this->is_modified = true; + unset($this->vars[$var_name]); + + // We save here to let the following cache hits succeed + $this->save(); + } + } + + /** + * Check if a given cache entry exist + */ + function _exists($var_name) + { + if ($var_name[0] == '_') + { + return $this->_isset($var_name); + } + else + { + if (!sizeof($this->vars)) + { + $this->load(); + } + + return isset($this->vars[$var_name]); + } + } + + /** + * Load cached sql query + */ + function sql_load($query) + { + // Remove extra spaces and tabs + $query = preg_replace('/[\n\r\s\t]+/', ' ', $query); + $query_id = sizeof($this->sql_rowset); + + if (($result = $this->_read('sql_' . md5($query))) === false) + { + return false; + } + + $this->sql_rowset[$query_id] = $result; + $this->sql_row_pointer[$query_id] = 0; + + return $query_id; + } + + /** + * Save sql query + */ + function sql_save($query, &$query_result, $ttl) + { + global $db; + + // Remove extra spaces and tabs + $query = preg_replace('/[\n\r\s\t]+/', ' ', $query); + $hash = md5($query); + + // determine which tables this query belongs to + // Some queries use backticks, namely the get_database_size() query + // don't check for conformity, the SQL would error and not reach here. + if (!preg_match('/FROM \\(?(`?\\w+`?(?: \\w+)?(?:, ?`?\\w+`?(?: \\w+)?)*)\\)?/', $query, $regs)) + { + // Bail out if the match fails. + return; + } + $tables = array_map('trim', explode(',', $regs[1])); + + foreach ($tables as $table_name) + { + // Remove backticks + $table_name = ($table_name[0] == '`') ? substr($table_name, 1, -1) : $table_name; + + if (($pos = strpos($table_name, ' ')) !== false) + { + $table_name = substr($table_name, 0, $pos); + } + + $temp = $this->_read('sql_' . $table_name); + + if ($temp === false) + { + $temp = array(); + } + + $temp[$hash] = true; + + // This must never expire + $this->_write('sql_' . $table_name, $temp, 0); + } + + // store them in the right place + $query_id = sizeof($this->sql_rowset); + $this->sql_rowset[$query_id] = array(); + $this->sql_row_pointer[$query_id] = 0; + + while ($row = $db->sql_fetchrow($query_result)) + { + $this->sql_rowset[$query_id][] = $row; + } + $db->sql_freeresult($query_result); + + $this->_write('sql_' . $hash, $this->sql_rowset[$query_id], $ttl); + + $query_result = $query_id; + } + + /** + * Ceck if a given sql query exist in cache + */ + function sql_exists($query_id) + { + return isset($this->sql_rowset[$query_id]); + } + + /** + * Fetch row from cache (database) + */ + function sql_fetchrow($query_id) + { + if ($this->sql_row_pointer[$query_id] < sizeof($this->sql_rowset[$query_id])) + { + return $this->sql_rowset[$query_id][$this->sql_row_pointer[$query_id]++]; + } + + return false; + } + + /** + * Fetch a field from the current row of a cached database result (database) + */ + function sql_fetchfield($query_id, $field) + { + if ($this->sql_row_pointer[$query_id] < sizeof($this->sql_rowset[$query_id])) + { + return (isset($this->sql_rowset[$query_id][$this->sql_row_pointer[$query_id]][$field])) ? $this->sql_rowset[$query_id][$this->sql_row_pointer[$query_id]++][$field] : false; + } + + return false; + } + + /** + * Seek a specific row in an a cached database result (database) + */ + function sql_rowseek($rownum, $query_id) + { + if ($rownum >= sizeof($this->sql_rowset[$query_id])) + { + return false; + } + + $this->sql_row_pointer[$query_id] = $rownum; + return true; + } + + /** + * Free memory used for a cached database result (database) + */ + function sql_freeresult($query_id) + { + if (!isset($this->sql_rowset[$query_id])) + { + return false; + } + + unset($this->sql_rowset[$query_id]); + unset($this->sql_row_pointer[$query_id]); + + return true; + } + + /** + * Removes/unlinks file + */ + function remove_file($filename, $check = false) + { + if (!function_exists('phpbb_is_writable')) + { + global $phpbb_root_path, $phpEx; + include($phpbb_root_path . 'includes/functions.' . $phpEx); + } + + if ($check && !phpbb_is_writable($this->cache_dir)) + { + // E_USER_ERROR - not using language entry - intended. + trigger_error('Unable to remove files within ' . $this->cache_dir . '. Please check directory permissions.', E_USER_ERROR); + } + + return @unlink($filename); + } + + /** + * Check if a cache var exists + * + * @access protected + * @param string $var Cache key + * @return bool True if it exists, otherwise false + */ + function _isset($var) + { + // Most caches don't need to check + return true; + } +} |