class ApcClassLoader

ApcClassLoader implements a wrapping autoloader cached in APC for PHP 5.3.

It expects an object implementing a findFile method to find the file. This allow 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 ApcClassLoader('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>

@api

Hierarchy

Expanded class hierarchy of ApcClassLoader

File

drupal/core/vendor/symfony/class-loader/Symfony/Component/ClassLoader/ApcClassLoader.php, line 42

Namespace

Symfony\Component\ClassLoader
View source
class ApcClassLoader {
  private $prefix;
  private $classFinder;

  /**
   * Constructor.
   *
   * @param string $prefix      A prefix to create a namespace in APC
   * @param object $classFinder An object that implements findFile() method.
   *
   * @api
   */
  public function __construct($prefix, $classFinder) {
    if (!extension_loaded('apc')) {
      throw new \RuntimeException('Unable to use ApcClassLoader as APC is not enabled.');
    }
    if (!method_exists($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 APC.
   *
   * @param string $class A class name to resolve to file
   *
   * @return string|null
   */
  public function findFile($class) {
    if (false === ($file = apc_fetch($this->prefix . $class))) {
      apc_store($this->prefix . $class, $file = $this->classFinder
        ->findFile($class));
    }
    return $file;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
ApcClassLoader::$classFinder private property
ApcClassLoader::$prefix private property
ApcClassLoader::findFile public function Finds a file by class name while caching lookups to APC.
ApcClassLoader::loadClass public function Loads the given class or interface.
ApcClassLoader::register public function Registers this instance as an autoloader.
ApcClassLoader::unregister public function Unregisters this instance as an autoloader.
ApcClassLoader::__construct public function Constructor.