class CacheWarmerAggregate

CacheWarmerAggregateTest.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/CacheWarmer/CacheWarmerAggregateTest.php

class CacheWarmerAggregate implements CacheWarmerInterface {
  protected $warmers;
  protected $optionalsEnabled;
  public function __construct(array $warmers = array()) {
    $this
      ->setWarmers($warmers);
    $this->optionalsEnabled = false;
  }
  public function enableOptionalWarmers() {
    $this->optionalsEnabled = true;
  }

  /**
   * Warms up the cache.
   *
   * @param string $cacheDir The cache directory
   */
  public function warmUp($cacheDir) {
    foreach ($this->warmers as $warmer) {
      if (!$this->optionalsEnabled && $warmer
        ->isOptional()) {
        continue;
      }
      $warmer
        ->warmUp($cacheDir);
    }
  }

  /**
   * Checks whether this warmer is optional or not.
   *
   * @return Boolean always true
   */
  public function isOptional() {
    return false;
  }
  public function setWarmers(array $warmers) {
    $this->warmers = array();
    foreach ($warmers as $warmer) {
      $this
        ->add($warmer);
    }
  }
  public function add(CacheWarmerInterface $warmer) {
    $this->warmers[] = $warmer;
  }

}