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