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Get Weather - Step 9 - Decoupling

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  1. //decoupling: 
  2. //changing the inner impl of MemCache without affecting the 
  3. //consumers...they get what they need without KNOWING or CARING about 
  4. //the inner implementation of MemCache...
  5.  
  6. class MemCache extends BaseCache{
  7.  
  8. 	//define("MEM_CACHE_SESSION_KEY", "__memcachesessionkey");	
  9.  
  10. 	public function MemCache(){
  11. 		//some intitialization here...
  12. 	}
  13.  
  14. 	public function get($key){
  15. 		if (!array_key_exists($key, $_SESSION[MEM_CACHE_SESSION_KEY]))
  16. 			return $_SESSION[MEM_CACHE_SESSION_KEY];
  17.  
  18. 		//else
  19. 		echo "Huston we have a problem!";
  20. 	}
  21.  
  22. 	public function set($key, $val){
  23. 		if (array_key_exists($key, $_SESSION[MEM_CACHE_SESSION_KEY]))
  24. 			echo "Huston...just to let you know that an override occurs here to $key with val: $val";
  25.  
  26. 		$_SESSION[MEM_CACHE_SESSION_KEY][$key] = $val;
  27. 	}
  28. }

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