PHP设计模式—中介者模式

/**
 * 抽象中介者
 * Class Mediator
 */
abstract class Mediator
{
 
    /**
     * 定义一个抽象的发送消息方法，得到同事对象和发送消息
     * @param string $message 要发送的消息
     * @param Colleague $colleague 同事对象
     * @return mixed
     */
    abstract public function send($message, Colleague $colleague);
}
 
 
/**
 * 抽象同事类
 * Class Colleague
 */
abstract class Colleague
{
    /**
     * 中介者对象
     * @var Mediator
     */
    protected $mediator;
 
    public function __construct(Mediator $mediator)
    {
        $this->mediator = $mediator;
    }
}
 
 
/**
 * 具体中介者对象
 * Class ConcreteMediator
 */
class ConcreteMediator extends Mediator
{
    /**
     * 具体同事对象ConcreteColleague1
     * @var
     */
    private $colleague1;
 
    /**
     * 具体同事对象ConcreteColleague2
     * @var
     */
    private $colleague2;
 
 
    /**
     * @param $c1
     */
    public function setColleague1($c1)
    {
        $this->colleague1 = $c1;
    }
 
 
    /**
     * @param $c2
     */
    public function setColleague2($c2)
    {
        $this->colleague2 = $c2;
    }
 
 
    /**
     * 重写发送消息的方法，根据对象做出判断选择，通知相应的对象
     * @param string $message
     * @param Colleague $colleague
     * @return mixed|void
     */
    public function send($message, Colleague $colleague)
    {
        // TODO: Implement send() method.
        if ($colleague == $this->colleague1) {
            $this->colleague2->notify($message);
        } else {
            $this->colleague1->notify($message);
        }
    }
}
 
 
/**
 * 具体同事类
 * Class ConcreteColleague1
 */
class ConcreteColleague1 extends Colleague
{
    /**
     * 发送消息
     * @param $message
     */
    public function send($message)
    {
        $this->mediator->send($message, $this);
    }
 
 
    /**
     * 得到消息
     * @param $message
     */
    public function notify($message)
    {
        echo "ConcreteColleague1得到消息：{$message}<br>";
    }
}
 
 
/**
 * 具体同事类
 * Class ConcreteColleague2
 */
class ConcreteColleague2 extends Colleague
{
    /**
     * 发送消息
     * @param $message
     */
    public function send($message)
    {
        $this->mediator->send($message, $this);
    }
 
 
    /**
     * 得到消息
     * @param $message
     */
    public function notify($message)
    {
        echo "ConcreteColleague2得到消息：{$message}<br>";
    }
}
 
 
##客户端代码
$m = new ConcreteMediator();
 
$c1 = new ConcreteColleague1($m);
$c2 = new ConcreteColleague2($m);
 
$m->setColleague1($c1);
$m->setColleague2($c2);
 
$c1->send("下班了吗？");
$c2->send("还没呢，今晚加班。");
 
 
##测试结果
ConcreteColleague2得到消息：下班了吗？
ConcreteColleague1得到消息：还没呢，今晚加班。