/**
* 观察者模式例子具体实现
*/
class Event extends \Itool\EventGenerator
{
function trigger()
{
echo "Event<br/>\n";
$this->notify();
}
}
class BoyObserver implements Itool\Observer
{
function update()
{
echo "男孩观察者<br/>";
}
}
class GirlObserver implements Itool\Observer
{
function update()
{
echo "女孩观察者<br/>";
}
}
$event = new Event();
// 同理此处可以无限增加观察者，从而实现解耦的过程
$event->addObserver(new BoyObserver());
$event->addObserver(new GirlObserver());
$event->trigger();
<?php
class Event extends \IMooc\EventGenerator
{
function trigger()
{
echo "Event<br/>\n";
$this->notify();
}
}
class Observer1 implements \IMooc\Observer
{
function update($event_info = null)
{
echo "逻辑1<br />\n";
}
}
class Observer2 implements \IMooc\Observer
{
function update($event_info = null)
{
echo "逻辑2<br />\n";
}
}
$event = new Event();
//$event->addObserver(new Observer1);
$event->addObserver(new Observer2());
$event->trigger();
}
class Event implements EventGenerator
{
var $observers = array();
function trigger()
{
echo 'this is event from class Event<br>';
}
function addObserver(Observer $observer)
{
$this->observers[] = $observer;
}
function notify()
{
foreach ($this->observers as $key => $observer) {
$observer->update();
}
}
}
class Observer1 extends Observer
{
function update()
{
echo 'this is a logic in observer<br>';
}
}
$event = new Event();
$event->trigger();
$observer1 = new Observer1();
$event->addObserver($observer1);
$event->notify();
