php设计模式之观察者模式

/**  * Interface Observable  * define a observable interface  * @author jichao.wang  */ interface Observable {     function attach(Observer $observer);      function detach(Observer $observer);      function notify(); }  /**  * Class Login  * @author jichao.wang  */ class Login implements Observable {     private $observers;     public $status;     public $ip;     const LOGIN_ACCESS = 1;     const LOGIN_WRONG_PASS = 2;     const LOGIN_USER_UNKNOWN = 3;      function __construct()     {         $this->observers = array();     }      /**      * @param Observer $observer      * @author jichao.wang      * attach a observer      */     function attach(Observer $observer)     {         $this->observers[] = $observer;     }      /**      * @param Observer $observer      * @author jichao.wang      * detach a observer      */     function detach(Observer $observer)     {         $newObservers = array();         foreach ($this->observers as $key => $obs) {             if ($obs !== $observer) {                 $newObservers[] = $obs;             }         }         $this->observers = $newObservers;     }      /**      * @author jichao.wang      * handle observer notify      */     function notify()     {         foreach ($this->observers as $obs) {             $obs->update($this);         }     }      /**      * @author jichao.wang      * 执行登陆      */     function handleLogin()     {         $ip = rand(1,100);         switch (rand(1, 3)) {             case 1:                 $this->setStatus(self::LOGIN_ACCESS, $ip);                 $ret = true;                 break;             case 2:                 $this->setStatus(self::LOGIN_WRONG_PASS, $ip);                 $ret = false;                 break;             case 3:                 $this->setStatus(self::LOGIN_USER_UNKNOWN, $ip);                 $ret = false;                 break;         }         /**          * handle event          */         $this->notify();         return $ret;     }      /**      * @param $status      * @author jichao.wang      * set login status      */     function setStatus($status,$ip)     {         $this->status = $status;         $this->ip = $ip;     }      /**      * @return mixed      * @author jichao.wang      * get login status      */     function getStatus()     {         return $this->status;     } }  /**  * Interface Observer  * @author jichao.wang  */ interface Observer {     function update(Observable $observable); }  /**  * Class EmailObserver  * @author jichao.wang  */ class EmailObserver implements Observer {     function update (Observable $observable) {         $status = $observable->getStatus();         if($status == Login::LOGIN_ACCESS){ //            $this->sendMail('用户ip:'.$observable->ip.'登陆成功!');             echo __CLASS__.'用户ip:'.$observable->ip.'登陆成功!'.'------------------';         }         if($status == Login::LOGIN_WRONG_PASS){ //            $this->sendMail('用户ip:'.$observable->ip.'登陆失败，密码错误!');             echo __CLASS__.'用户ip:'.$observable->ip.'登陆失败，密码错误!'.'------------------';         }         if($status == Login::LOGIN_USER_UNKNOWN){ //            $this->sendMail('用户ip:'.$observable->ip.'登陆失败，无此用户!');             echo __CLASS__.'用户ip:'.$observable->ip.'登陆失败，无此用户!'.'------------------';         }     } }  /**  * Class PhoneObserver  * @author jichao.wang  */ class PhoneObserver implements Observer {     function update (Observable $observable) {         $status = $observable->getStatus();         if($status == Login::LOGIN_ACCESS){ //            $this->sendMail('用户ip:'.$observable->ip.'登陆成功!');             echo __CLASS__.'用户ip:'.$observable->ip.'登陆成功!'.'------------------';         }         if($status == Login::LOGIN_WRONG_PASS){ //            $this->sendMail('用户ip:'.$observable->ip.'登陆失败，密码错误!');             echo __CLASS__.'用户ip:'.$observable->ip.'登陆失败，密码错误!'.'------------------';         }         if($status == Login::LOGIN_USER_UNKNOWN){ //            $this->sendMail('用户ip:'.$observable->ip.'登陆失败，无此用户!');             echo __CLASS__.'用户ip:'.$observable->ip.'登陆失败，无此用户!'.'------------------';         }     } }  class AbcObserver implements Observer {     function update (Observable $observable) {         $status = $observable->getStatus();         if($status == Login::LOGIN_ACCESS){ //            $this->sendMail('用户ip:'.$observable->ip.'登陆成功!');             echo __CLASS__.'用户ip:'.$observable->ip.'登陆成功!'.'------------------';         }         if($status == Login::LOGIN_WRONG_PASS){ //            $this->sendMail('用户ip:'.$observable->ip.'登陆失败，密码错误!');             echo __CLASS__.'用户ip:'.$observable->ip.'登陆失败，密码错误!'.'------------------';         }         if($status == Login::LOGIN_USER_UNKNOWN){ //            $this->sendMail('用户ip:'.$observable->ip.'登陆失败，无此用户!');             echo __CLASS__.'用户ip:'.$observable->ip.'登陆失败，无此用户!'.'------------------';         }     } }  //实例化登陆信息 $login = new Login(); //实现发邮件观察者 $login->attach(new EmailObserver()); //实现发验证码观察者 $login->attach(new PhoneObserver()); //实现其他观察者 $login->attach(new AbcObserver()); //开始登陆 $login->handleLogin(); ?>