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<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/
namespace phpbb\cache\driver;
/**
* ACM Abstract Memory Class
*/
abstract class memory extends \phpbb\cache\driver\base
{
    var $key_prefix;
    /**
    * Set cache path
    */
    function __construct()
    {
        global $phpbb_root_path, $dbname, $table_prefix, $phpbb_container;
        $this->cache_dir    = $phpbb_container->getParameter('core.cache_dir');
        $this->key_prefix    = substr(md5($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);
        }
    }
    /**
    * {@inheritDoc}
    */
    function load()
    {
        // grab the global cache
        $data = $this->_read('global');
        if ($data !== false)
        {
            $this->vars = $data;
            return true;
        }
        return false;
    }
    /**
    * {@inheritDoc}
    */
    function save()
    {
        if (!$this->is_modified)
        {
            return;
        }
        $this->_write('global', $this->vars, 2592000);
        $this->is_modified = false;
    }
    /**
    * {@inheritDoc}
    */
    function tidy()
    {
        global $config;
        // cache has auto GC, no need to have any code here :)
        $config->set('cache_last_gc', time(), false);
    }
    /**
    * {@inheritDoc}
    */
    function get($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;
        }
    }
    /**
    * {@inheritDoc}
    */
    function put($var_name, $var, $ttl = 2592000)
    {
        if ($var_name[0] == '_')
        {
            $this->_write($var_name, $var, $ttl);
        }
        else
        {
            $this->vars[$var_name] = $var;
            $this->is_modified = true;
        }
    }
    /**
    * {@inheritDoc}
    */
    function destroy($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
            $this->save();
        }
    }
    /**
    * {@inheritDoc}
    */
    function _exists($var_name)
    {
        if ($var_name[0] == '_')
        {
            return $this->_isset($var_name);
        }
        else
        {
            if (!count($this->vars))
            {
                $this->load();
            }
            return isset($this->vars[$var_name]);
        }
    }
    /**
    * {@inheritDoc}
    */
    function sql_save(\phpbb\db\driver\driver_interface $db, $query, $query_result, $ttl)
    {
        // Remove extra spaces and tabs
        $query = preg_replace('/[\n\r\s\t]+/', ' ', $query);
        $query_id = md5($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_all('/(?:FROM \\(?(`?\\w+`?(?: \\w+)?(?:, ?`?\\w+`?(?: \\w+)?)*)\\)?)|(?:JOIN (`?\\w+`?(?: \\w+)?))/', $query, $regs, PREG_SET_ORDER))
        {
            // Bail out if the match fails.
            return $query_result;
        }
        $tables = array();
        foreach ($regs as $match)
        {
            if ($match[0][0] == 'F')
            {
                $tables = array_merge($tables, array_map('trim', explode(',', $match[1])));
            }
            else
            {
                $tables[] = $match[2];
            }
        }
        foreach ($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();
            }
            $temp[$query_id] = true;
            // This must never expire
            $this->_write('sql_' . $table_name, $temp, 0);
        }
        // store them in the right place
        $this->sql_rowset[$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_' . $query_id, $this->sql_rowset[$query_id], $ttl);
        return $query_id;
    }
    /**
    * 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;
    }
}