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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\ClassLoader;
/**
* XcacheClassLoader implements a wrapping autoloader cached in Xcache for PHP 5.3.
*
* It expects an object implementing a findFile method to find the file. This
* allows using it as a wrapper around the other loaders of the component (the
* ClassLoader and the UniversalClassLoader for instance) but also around any
* other autoloader following this convention (the Composer one for instance)
*
* $loader = new ClassLoader();
*
* // register classes with namespaces
* $loader->add('Symfony\Component', __DIR__.'/component');
* $loader->add('Symfony', __DIR__.'/framework');
*
* $cachedLoader = new XcacheClassLoader('my_prefix', $loader);
*
* // activate the cached autoloader
* $cachedLoader->register();
*
* // eventually deactivate the non-cached loader if it was registered previously
* // to be sure to use the cached one.
* $loader->unregister();
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Kris Wallsmith <kris@symfony.com>
* @author Kim Hemsø Rasmussen <kimhemsoe@gmail.com>
*
* @api
*/
class XcacheClassLoader
{
private $prefix;
private $classFinder;
/**
* Constructor.
*
* @param string $prefix A prefix to create a namespace in Xcache
* @param object $classFinder An object that implements findFile() method.
*
* @throws \RuntimeException
* @throws \InvalidArgumentException
*
* @api
*/
public function __construct($prefix, $classFinder)
{
if (!extension_loaded('Xcache')) {
throw new \RuntimeException('Unable to use XcacheClassLoader as Xcache is not enabled.');
}
if (!method_exists($classFinder, 'findFile')) {
throw new \InvalidArgumentException('The class finder must implement a "findFile" method.');
}
$this->prefix = $prefix;
$this->classFinder = $classFinder;
}
/**
* Registers this instance as an autoloader.
*
* @param Boolean $prepend Whether to prepend the autoloader or not
*/
public function register($prepend = false)
{
spl_autoload_register(array($this, 'loadClass'), true, $prepend);
}
/**
* Unregisters this instance as an autoloader.
*/
public function unregister()
{
spl_autoload_unregister(array($this, 'loadClass'));
}
/**
* Loads the given class or interface.
*
* @param string $class The name of the class
*
* @return Boolean|null True, if loaded
*/
public function loadClass($class)
{
if ($file = $this->findFile($class)) {
require $file;
return true;
}
}
/**
* Finds a file by class name while caching lookups to Xcache.
*
* @param string $class A class name to resolve to file
*
* @return string|null
*/
public function findFile($class)
{
if (xcache_isset($this->prefix.$class)) {
$file = xcache_get($this->prefix.$class);
} else {
$file = $this->classFinder->findFile($class);
xcache_set($this->prefix.$class, $file);
}
return $file;
}
}