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Lesson 3 - Step 3 - Polymorphism in action

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  1. ///a generic logger...
  2. //polymorphism in action
  3.  
  4. abstract class ILogger {
  5.  
  6. 	protected abstract function writeLog($sSevirity, $sMsg);
  7. }
  8.  
  9.  
  10. class Logger implements ILogger{
  11.  
  12. 	private static $loggers = array();
  13.  
  14. 	protected function writeLog($sSevirity, $sMsg){
  15. 		foreach (self::$loggers as $logger){
  16. 			$logger->writeLog($sSevirity, $sMsg);
  17. 		}
  18. 	}
  19.  
  20. 	public function registerLogger(ILogger $logger){
  21. 		self::$loggers[count(self::$loggers)] = $logger;
  22. 	}
  23.  
  24. 	public function logDebug($sMsg){
  25. 		$this->writeLog("DEBUG", $sMsg);
  26. 	}
  27.  
  28. 	public function logError($sMsg){
  29. 		$this->writeLog("ERROR", $sMsg);
  30. 	}
  31.  
  32. 	public function logInfo($sMsg){
  33. 		$this->writeLog("INFO", $sMsg);
  34. 	}
  35. }
  36.  
  37. abstract class BaseLogger implements ILogger{
  38.  
  39. 	private $ipAddr;
  40.  
  41. 	public function BaseLogger(){
  42. 		Logger::registerLogger($this);
  43. 	}
  44.  
  45. 	private function getClientIP(){
  46. 		//...
  47. 	}
  48. }
  49.  
  50.  
  51. class MyFileLogger extends BaseLogger{
  52.  
  53. 	public function MyFileLogger(){
  54. 		parent::__constructor();
  55. 	}
  56.  
  57. 	protected function writeLog($sSevirity, $sMsg){
  58. 		error_log("[". $this->getClientIP() ."] :: ". date("j/n/y H:i:s") . $sSevirity .": ". $sMsg);
  59. 	}
  60. } 
  61.  
  62. class MyDBLogger extends BaseLogger{
  63.  
  64. 	public function MyFileLogger(){
  65. 		parent::__constructor();
  66. 	}
  67.  
  68. 	protected function writeLog($sSevirity, $sMsg){
  69. 		//connect...
  70.  
  71. 		$query = "insert into my_logger (sevirity, message) values ('$sSevirity', '$sMsg')";
  72. 		mysql_query($query);
  73. 	}
  74. } 
  75.  
  76.  
  77.  
  78. //in use...
  79.  
  80. $logger = new Logger();
  81.  
  82. $logger->logDebug("miao");
  83. $logger->logInfo("mitzi");
  84. $logger->logError("pizzi");

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