<?php 
namespace Aws; 
 
/** 
 * Represents a simple cache interface. 
 */ 
interface CacheInterface 
{ 
    /** 
     * Get a cache item by key. 
     * 
     * @param string $key Key to retrieve. 
     * 
     * @return mixed|null Returns the value or null if not found. 
     */ 
    public function get($key); 
 
    /** 
     * Set a cache key value. 
     * 
     * @param string $key   Key to set 
     * @param mixed  $value Value to set. 
     * @param int    $ttl   Number of seconds the item is allowed to live. Set 
     *                      to 0 to allow an unlimited lifetime. 
     */ 
    public function set($key, $value, $ttl = 0); 
 
    /** 
     * Remove a cache key. 
     * 
     * @param string $key Key to remove. 
     */ 
    public function remove($key); 
} 
 
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