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Get Weather - Step 8 - Adding Abstraction. Pt 2.

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  1. //creating the so called "abstraction" layer...(!!!!)
  2. abstract class BaseCache{
  3.  
  4. 	public function BaseCache(){
  5. 		//some intitialization here...
  6. 	}
  7.  
  8. 	abstract public function set($key, $val);
  9.  
  10. 	abstract public function get($key);
  11.  
  12. }
  13.  
  14.  
  15. //no "abstract" key word before class 
  16. //and before abstract methods (unless...MemCahce was abstract itself...)
  17. class MemCache extends BaseCache{
  18.  
  19. 	public function set($key, $val){ 
  20. 	//...
  21. 	}
  22.  
  23.  
  24. }
  25.  
  26.  
  27. class DBCache extends BaseCache{
  28.  
  29. 	public function set($key, $val){ 
  30. 	// " INSERT INTO my_cache_table (key, val) values ("$key", "$val")..."
  31. 	}
  32.  
  33. 	public function get($key) {
  34. 		// SELECT key,val from my_cache_table where key=$key..."
  35. 	}
  36. }

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