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【PHP】订阅者模式

作者:cumtm3 / 发布于2015/4/8/ 541

假设有一个系统服务，有几个模块需要使用服务，组件可以订阅这个服务或消息，通过系统广播通知所有的模块。


	<?php
	// 订阅发布模式 接口的定义及消息的传递
	
	class Dispatcher
	{
	 // 监视
	 public static $listeners = array();
	 protected function __construct(){}
	
	 // 订阅服务
	 public static function subscribe($object, $subscribe)
	 {
	 $id = spl_object_hash($object);
	 self::$listeners[$id][] = $subscribe;
	 }
	 // 广播消息
	 public static function publish($object)
	 {
	 $id = spl_object_hash($object);
	 foreach (self::$listeners[$id] as $subscriber) {
	 //var_dump($subscriber);
	 $subscriber->doSomething();
	 }
	 }
	}
	
	class Service
	{
	 protected $name = '';
	 public function __construct($name)
	 {
	 $this->name = $name;
	 }
	 // 触发动作
	 public function doSomething()
	 {
	 echo sprintf("%s has something happened.\n", $this->name);
	 Dispatcher::publish($this);
	 }
	}
	
	class Component
	{
	 protected $name = '';
	 public function __construct($name)
	 {
	 $this->name = $name;
	 }
	
	 public function doSomething()
	 {
	 echo sprintf("%s did something.\n", $this->name);
	 }
	}
	
	$serviceA = new Service("ServiceA");
	$componentA = new Component("componentA");
	$componentB = new Component("componentB");
	$componentC = new Component("componentC");
	
	Dispatcher::subscribe($serviceA, $componentA);
	Dispatcher::subscribe($serviceA, $componentB);
	Dispatcher::subscribe($serviceA, $componentC);
	// 触发一个动作
	$serviceA->doSomething();
	// output
	//ServiceA something happened.
	//componentA did something.
	//componentB did something.
	//componentC did something.

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