php 事件驱动

<?php
/**
 * 事件驱动模型
 * 简介：观察者模式的另一种形态，观察者相当于监听器，被观察者相当于事件源
 * 目的：事件源产生事件，监听器监听事件
 * 总结：事件发生-事件处理模型
 * 组成：监听器，事件源，事件源管理器
 * User: lionzheng
 * Date: 2018/10/16
 * Time: 15:04
 *
 */

/**
 * 监听器
 * Class EventListener
 */
class EventListener
{
    protected $name = '';

    public function handleEvent($msg)
    {
        echo "{$this->name} 阅读了 : $msg \n";
    }
}

/**
 * 事件源 - 事件载体
 * Class EventObject
 */
class EventSource
{
    protected $eventName;
    protected $eventData;

    public function getEventName()
    {
        return $this->eventName;
    }

    public function getEventData()
    {
        return $this->eventData;
    }

}

/**
 * 事件管理器
 * Class EventManager
 */
class EventManager
{
    private static $eventList = [];

    /**
     * 绑定事件
     */
    function attachListener(EventSource $eventObject, EventListener $listener)
    {
        //一个事件名绑定多个监听器
        self::$eventList[$eventObject->getEventName()][] = $listener;
    }

    /**
     * 解除绑定事件
     */
    public function detach(EventSource $eventObject)
    {
        unset(self::$eventList[$eventObject->getEventName()]);
    }

    /**
     * 触发事件
     */
    public function fire(EventSource $eventObject)
    {
        foreach (self::$eventList as $attachEventName => $listenerList) {
            //匹配监听列表
            if ($eventObject->getEventName() == $attachEventName) {
                foreach ($listenerList as $eventListener) {
                    $eventListener->handleEvent($eventObject->getEventData());
                }
            }
        }
    }
}

/**
 * 写入操作的一个事件监听器
 * Class WriterListener
 */
class WriterListener extends EventListener
{
    public function __construct($name)
    {
        $this->name = $name;
    }
}

/**
 * 一个写的事件
 * Class WriteEvent
 */
class Writer extends EventSource
{
    public function __construct($eventName, $eventData)
    {
        $this->eventName = $eventName;
        $this->eventData = $eventData;
        echo "$eventName 发布了新作 $eventData\n";
        echo "---------------------------------\n";

    }
}

function main()
{
    //初始化管理器
    $eventManager = new EventManager();
    //初始化听众
    $listener1 = new WriterListener('lion');
    $listener2 = new WriterListener('2哈');
    $listener3 = new WriterListener('aiwen');
    $listener4 = new WriterListener('yuan');
    //初始化作者
    $writer1 = new Writer('郭敬明', '小时代');
    $writer2 = new Writer('莫言', '人间正道是沧桑');

    $eventManager->attachListener($writer1, $listener1);
    $eventManager->attachListener($writer2, $listener2);
    $eventManager->attachListener($writer2, $listener3);
    $eventManager->attachListener($writer2, $listener4);

    $eventManager->fire($writer1);
    $eventManager->fire($writer2);

}

main();
　　

 输出结果：