<?php
namespace Atto\Cache;
/**
* Simple extensible cache system
*
* @package Atto
*
* @namespace Atto\Cache
* @name Atto\Cache\Cache
* @author Andrei Alexandru Romila
* @version v1.0
*/
class Cache {
/**
* Storage engine
*
* @var Storage
*/
protected $storage;
/**
* Time to live (default value)
*
* @var integer Time to live in seconds
*/
protected $ttl;
/**
* Default constructor
*
* @param Storage $storage Storage engine
* @param int $ttl Time to live in seconds (ttl less than or equal to 0 means no expiration)
*/
public function __construct(Storage $storage, $ttl = 0) {
$this->storage = $storage;
$this->ttl = $ttl;
}
/**
* Returns the data for the indicated $key or null if was not found or expired
*
* @param string $key
*
* @return mixed|NULL The data saved for the key or null if is expired or not found
*/
public function get($key) {
$item = $this->storage->getItem($key);
if ($item === null || $item->expired()) {
$this->invalidate($key);
return null;
}
return $item->getData();
}
/**
* Stores a new item
*
* @param string $key The name of the item
* @param mixed $object The data to store
* @param integer $ttl Time to live in seconds, using less than 1 means no expiration
*/
public function store($key, $object, $ttl = null) {
// If no seconds are passed we use the default value
if ($ttl === null) {
$ttl = $this->ttl;
}
// Create a new item
$item = new Item($object, $ttl);
// Store
$this->storage->save($key, $item);
}
/**
* Invalidates the indicated item
*
* @param string $key The name of the item
*/
public function invalidate($key) {
$this->storage->delete($key);
}
}
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