Symlink Autoloader cache

SymlinkCacheLoader.php

<?php


namespace Symfony\Component\ClassLoader;

/**
 * A caching class loader similar to ApcClassLoader
 * Creates a symlink for each loaded file so it can be quickly loaded again later
 */
class SymlinkClassLoader
{
    private $cachePath;

    /**
     * A class loader object that implements the findFile() method.
     *
     * @var object
     */
    protected $decorated;
    /**
     * Constructor.
     *
     * @param string $cachePath    The path to store symlinks in
     * @param object $decorated A class loader object that implements the findFile() method.
     *
     * @throws \RuntimeException
     * @throws \InvalidArgumentException
     *
     * @api
     */
    public function __construct($cachePath, $decorated)
    {
        
        if (!method_exists($decorated, 'findFile')) {
            throw new \InvalidArgumentException('The class finder must implement a "findFile" method.');
        }

        $this->cachePath = $cachePath;
        
        if(false === is_dir($cachePath)) {
            mkdir($cachePath);
        }
        $this->decorated = $decorated;
        
    }

    /**
     * Registers this instance as an autoloader.
     *
     * @param bool $prepend Whether to prepend the autoloader or not
     */
    public function register($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 $class The name of the class
     *
     * @return bool|null True, if loaded
     */
    public function loadClass($class)
    {
        
        $path = $this->cachePath.DIRECTORY_SEPARATOR.$class.'.php';

        
        if(includeFile($path)) {
            return true;
        } else {
            if ($file = $this->decorated->findFile($class)) {
                includeFile($file);
                
                symlink($file, $path);

                return true;
            }
        }
    }

    /**
     * Passes through all unknown calls onto the decorated object.
     */
    public function __call($method, $args)
    {
        return call_user_func_array(array($this->decorated, $method), $args);
    }
}

/**
 * Scope isolated include.
 *
 * Prevents access to $this/self from included files.
 */
function includeFile($file)
{
    if(file_exists($file)) { //ideally we find a way to avoid using file_exists everytime
        include $file; 
        return true;
    }
    return false;
}

// USAGE in app.php etc

$loader = require_once __DIR__.'/../app/bootstrap.php.cache';
// or $loader = require_once __DIR__.'/../app/autoload.php';

$symlinkLoader = new SymlinkClassLoader(__DIR__.'/../app/cache/dev/symlinkCache', $loader);
$loader->unregister();
$symlinkLoader->register(true);