interface CacheInterface

1. 8.x drupal/core/vendor/kriswallsmith/assetic/src/Assetic/Cache/CacheInterface.php \Assetic\Cache\CacheInterface
2. 8.x drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Mapping/Cache/CacheInterface.php \Symfony\Component\Validator\Mapping\Cache\CacheInterface

AssetCache.php in drupal/core/vendor/kriswallsmith/assetic/src/Assetic/Asset/AssetCache.php

interface CacheInterface {

  /**
   * Checks if the cache has a value for a key.
   *
   * @param string $key A unique key
   *
   * @return Boolean Whether the cache has a value for this key
   */
  public function has($key);

  /**
   * Returns the value for a key.
   *
   * @param string $key A unique key
   *
   * @return string|null The value in the cache
   */
  public function get($key);

  /**
   * Sets a value in the cache.
   *
   * @param string $key   A unique key
   * @param string $value The value to cache
   */
  public function set($key, $value);

  /**
   * Removes a value from the cache.
   *
   * @param string $key A unique key
   */
  public function remove($key);

}