101 lines
3.0 KiB
PHP
101 lines
3.0 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\ClassLoader;
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/**
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* ApcUniversalClassLoader implements a "universal" autoloader cached in APC for PHP 5.3.
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*
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* It is able to load classes that use either:
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*
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* * The technical interoperability standards for PHP 5.3 namespaces and
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* class names (https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md);
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*
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* * The PEAR naming convention for classes (http://pear.php.net/).
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*
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* Classes from a sub-namespace or a sub-hierarchy of PEAR classes can be
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* looked for in a list of locations to ease the vendoring of a sub-set of
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* classes for large projects.
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*
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* Example usage:
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*
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* require 'vendor/symfony/src/Symfony/Component/ClassLoader/UniversalClassLoader.php';
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* require 'vendor/symfony/src/Symfony/Component/ClassLoader/ApcUniversalClassLoader.php';
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*
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* use Symfony\Component\ClassLoader\ApcUniversalClassLoader;
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*
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* $loader = new ApcUniversalClassLoader('apc.prefix.');
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*
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* // register classes with namespaces
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* $loader->registerNamespaces(array(
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* 'Symfony\Component' => __DIR__.'/component',
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* 'Symfony' => __DIR__.'/framework',
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* 'Sensio' => array(__DIR__.'/src', __DIR__.'/vendor'),
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* ));
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*
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* // register a library using the PEAR naming convention
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* $loader->registerPrefixes(array(
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* 'Swift_' => __DIR__.'/Swift',
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* ));
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*
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* // activate the autoloader
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* $loader->register();
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*
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* In this example, if you try to use a class in the Symfony\Component
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* namespace or one of its children (Symfony\Component\Console for instance),
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* the autoloader will first look for the class under the component/
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* directory, and it will then fallback to the framework/ directory if not
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* found before giving up.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Kris Wallsmith <kris@symfony.com>
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*
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* @api
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*/
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class ApcUniversalClassLoader extends UniversalClassLoader
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{
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private $prefix;
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/**
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* Constructor.
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*
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* @param string $prefix A prefix to create a namespace in APC
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*
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* @throws \RuntimeException
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*
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* @api
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*/
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public function __construct($prefix)
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{
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if (!extension_loaded('apc')) {
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throw new \RuntimeException('Unable to use ApcUniversalClassLoader as APC is not enabled.');
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}
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$this->prefix = $prefix;
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}
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/**
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* Finds a file by class name while caching lookups to APC.
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*
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* @param string $class A class name to resolve to file
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*
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* @return string|null The path, if found
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*/
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public function findFile($class)
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{
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if (false === $file = apc_fetch($this->prefix.$class)) {
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apc_store($this->prefix.$class, $file = parent::findFile($class));
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}
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return $file;
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}
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}
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