PHP实现观察者模式<?php
interface Message {
static function getType();
};
interface Observer {
function notifyMsg(Message $msg);
};
class Subject {
private $observers = Array();
public function registerObserver(Observer $observer, $msgType) {
$this->observers[$msgType][] = $observer; // wyh?
}
private function notifyMsg(Message $msg) {
@$observers = $this->observers[$msg->getType()];
if (!$observers) {
return;
}
foreach ($observers as $observer) {
$observer->notifyMsg($msg);
}
}
public function someMethod() {
sleep(1);
$this->notifyMsg(new HelloMessage("Michael"));
}
}
class HelloMessage implements Message {
private $name;
public function __construct($name) {
$this->name = $name;
}
public function getMsg() {
return "Hello,$this->name!";
}
static function getType() {
return "HELLO_TYPE";
}
}
class SubObserver implements Observer {
public function notifyMsg(Message $msg) {
if ($msg instanceof HelloMessage) {
echo $msg->getMsg();
}
}
}
$subject = new Subject();
$observer = new SubObserver();
$subject->registerObserver($observer, HelloMessage::getType());
$subject->someMethod();
?>
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