ExpiringCache.php

<?php

/*
 * This file is part of the Assetic package, an OpenSky project.
 *
 * (c) 2010-2012 OpenSky Project Inc
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Assetic\Cache;


/**
 * Adds expiration to a cache backend.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
class ExpiringCache implements CacheInterface {
  private $cache;
  private $lifetime;
  public function __construct(CacheInterface $cache, $lifetime) {
    $this->cache = $cache;
    $this->lifetime = $lifetime;
  }
  public function has($key) {
    if ($this->cache
      ->has($key)) {
      if (time() < $this->cache
        ->get($key . '.expires')) {
        return true;
      }
      $this->cache
        ->remove($key . '.expires');
      $this->cache
        ->remove($key);
    }
    return false;
  }
  public function get($key) {
    return $this->cache
      ->get($key);
  }
  public function set($key, $value) {
    $this->cache
      ->set($key . '.expires', time() + $this->lifetime);
    $this->cache
      ->set($key, $value);
  }
  public function remove($key) {
    $this->cache
      ->remove($key . '.expires');
    $this->cache
      ->remove($key);
  }

}