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<?php  
class
 CacheException 
extends
 Exception {}  
/**
 
 * »º´æ³éÏóÀà
 
 */
  
abstract
 
class
 Cache_Abstract {  
    /**
 
     * ¶Á»º´æ±äÁ¿
 
     *
 
     * @param string $key »º´æÏ±ê
 
     * @return mixed
 
     */
  
    abstract
 
public
 
function
 fetch(
$key
);  
      
    /**
 
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     * @param string $key »º´æ±äÁ¿Ï±ê
 
     * @param string $value »º´æ±äÁ¿µÄÖµ
 
     * @return bool
 
     */
  
    abstract
 
public
 
function
 store(
$key

$value
);  
      
    /**
 
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     * @param string $key »º´æÏ±ê
 
     * @return Cache_Abstract
 
     */
  
    abstract
 
public
 
function
 
delete
(
$key
);  
      
    /**
 
     * Çå(ɾ)³ýËùÓлº´æ
 
     *
 
     * @return Ca


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