<?php
/* $Id$ */
namespace Mammut\Storage\CachedStore;

(defined('MAMMUT') && (basename(__FILE__) != basename($_SERVER['PHP_SELF']))) or die('ACCESS DENIED');

use Mammut\Storage\KeyValue\iKeyValueStore;
use Mammut\Cache\None;
use Mammut\Cache\iCache;

/**
 * Stroage helper which provides a caching layer with lambda functions to handle the data access.
 *
 * @author Stefan Daurer <s.daurer@q-spot.org>
 * @package Mammut\Storage\CachedStore
 * @since 1.1.0.0
 */
class CachedLamdaStore extends CachedStore {

	private $storeL;
	private $fetchL;
	private $deleteL;
	private $existL;
	
	/**
	 * Creates a new cached stroage
	 * @param iCache $cache
	 * @param \Closure $store a function with two parameters: key and value
	 * @param \Closure $fetch a function with one parameter: key
	 * @param \Closure $delete a function with one parameter: key
	 * @param \Closure $exist a function with one parameter: key
	 * @param string $cachePrefix an optional prefix for the keys in the cache
	 */
	public function __construct(iCache $cache, \Closure $store, \Closure $fetch, \Closure $delete, \Closure $exist, $cachePrefix = '' ) {
		$this->cacheKeyPrefix = $cachePrefix;
		$this->cache = $cache;
		
		$this->storeL = $store;
		$this->fetchL = $fetch;
		$this->deleteL = $delete;
		$this->existL = $exist;
	}

	protected function storePersistend($key, $value) {
		$c = $this->storeL;
		$c($key,$value);
	}

	protected function fetchPersistend($key) {
		$c = $this->fetchL;
		return $c($key);
	}

	protected function existPersistend($key) {
		$c = $this->existL;
		return $c($key);
	}

	protected function deletePersistend($key) {
		$c = $this->deleteL;
		return $c($key);
	}
	
}