/**
* Define Predis base path if not already set, and if we need to set the
* autoloader by ourself. This will ensure no crash. Best way would have
* been that Drupal ships a PSR-0 autoloader, in which we could manually
* add our library path.
*
* We cannot do that in the file header, PHP class_exists() function wont
* see classes being loaded during the autoloading because this file is
* loaded by another autoloader: attempting the class_exists() during a
* pending autoloading would cause PHP to crash and ignore the rest of the
* file silentely (WTF!?). By delaying this at the getClient() call we
* ensure we are not in the class loading process anymore.
*/
public static function setPredisAutoload()
{
if (self::$autoloaderRegistered) {
return;
} else {
self::$autoloaderRegistered = true;
}
// If you attempt to set Drupal's bin cache_bootstrap using Redis, you
// will experience an infinite loop (breaking by itself the second time
// it passes by): the following call will wake up autoloaders (and we
// want that to work since user may have set its own autoloader) but
// will wake up Drupal's one too, and because Drupal core caches its
// file map, this will trigger this method to be called a second time
// and boom! Adios bye bye. That's why this will be called early in the
// 'redis.autoload.inc' file instead.
if (!class_exists('Predis\\Client')) {
if (!defined('PREDIS_BASE_PATH')) {
$search = DRUPAL_ROOT . '/sites/all/libraries/predis';
} else {
$search = PREDIS_BASE_PATH;
}
if (is_dir($search . '/src')) {
// Predis v1.x
self::$predisVersionMajor = 1;
define('PREDIS_BASE_PATH', $search);
} else {
if (is_dir($search . '/lib')) {
// Predis v0.x
self::$predisVersionMajor = 0;
define('PREDIS_BASE_PATH', $search);
} else {
throw new Exception("PREDIS_BASE_PATH constant must be set, Predis library must live in sites/all/libraries/predis.");
}
}
// Register a simple autoloader for Predis library. Since the Predis
// library is PHP 5.3 only, we can afford doing closures safely.
switch (self::$predisVersionMajor) {
case 0:
spl_autoload_register(function ($classname) {
// PSR-0 autoloader.
if (0 === strpos($classname, 'Predis\\')) {
$filename = PREDIS_BASE_PATH . '/lib/' . str_replace('\\', '/', $classname) . '.php';
return (bool) (require_once $filename);
}
return false;
});
break;
case 1:
// Register a simple autoloader for Predis library. Since the Predis
// library is PHP 5.3 only, we can afford doing closures safely.
spl_autoload_register(function ($classname) {
// PSR-4 autoloader
if (0 === strpos($classname, 'Predis\\')) {
$filename = PREDIS_BASE_PATH . '/src/' . str_replace('\\', '/', substr($classname, 7)) . '.php';
return (bool) (require_once $filename);
}
return false;
});
break;
}
}
}
