/**
* @param string $cache_directory
* @return Ai1ec_Cache_Strategy
*/
public static function create_cache_startegy_instance($cache_directory = null)
{
$is_cache_directory_writable = false;
if (null !== $cache_directory) {
if (!isset(self::$cache_directories[$cache_directory])) {
self::$cache_directories[$cache_directory] = Ai1ec_Filesystem_Utility::is_writable($cache_directory);
}
$is_cache_directory_writable = self::$cache_directories[$cache_directory];
}
$is_apc_installed = function_exists('apc_store') && function_exists('apc_fetch') && ini_get('apc.enabled');
$sapi_type = php_sapi_name();
if (substr($sapi_type, 0, 3) === 'cgi' || substr($sapi_type, -3, 3) === 'cgi') {
$is_apc_installed = false;
}
if ($is_apc_installed) {
return new Ai1ec_Apc_Cache();
} else {
if ($is_cache_directory_writable) {
return new Ai1ec_File_Cache($cache_directory);
} else {
return new Ai1ec_Db_Cache(Ai1ec_Adapters_Factory::create_db_adapter_instance());
}
}
}
/**
* _is_cache_dir_writable method
*
* Check if given cache directory is writable.
*
* @param string $directory A path to check for writability
*
* @return bool Writability
*/
protected static function _is_cache_dir_writable($directory)
{
if (!isset(self::$cache_directories[$directory])) {
self::$cache_directories[$directory] = Ai1ec_Filesystem_Utility::is_writable($directory);
}
return self::$cache_directories[$directory];
}
