FrontendInterface.php
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<?php 
namespace Phalcon\Cache {
	/**
	 * Phalcon\Cache\FrontendInterface initializer
	 */
	
	interface FrontendInterface {
		/**
		 * Returns the cache lifetime
		 *
		 * @return int
		 */
		public function getLifetime();
		/**
		 * Check whether if frontend is buffering output
		 *
		 * @return boolean
		 */
		public function isBuffering();
		/**
		 * Starts the frontend
		 */
		public function start();
		/**
		 * Returns output cached content
		 *
		 * @return string
		 */
		public function getContent();
		/**
		 * Stops the frontend
		 */
		public function stop();
		/**
		 * Serializes data before storing it
		 *
		 * @param mixed $data
		 */
		public function beforeStore($data);
		/**
		 * Unserializes data after retrieving it
		 *
		 * @param mixed $data
		 */
		public function afterRetrieve($data);
	}
}