+<?php

+/**

+*

+* @package acm

+* @copyright (c) 2005 phpBB Group

+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2

+*

+*/

+

+/**

+* @ignore

+*/

+if (!defined('IN_PHPBB'))

+{

+ exit;

+}

+

+/**

+* ACM Abstract Memory Class

+* @package acm

+*/

+abstract 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, 'container_') !== 0 &&

+ strpos($entry, 'url_matcher') !== 0 &&

+ 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;

+ }

+

+ /**

+ * {@inheritDoc}

+ */

+ function sql_save(phpbb_db_driver $db, $query, $query_result, $ttl)

+ {

+ // 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 $query_result;

+ }

+ $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);

+

+ return $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;

+ }

+}