php调停者模式(mediator pattern)

差不多了，睡一觉，下次再弄。

<?php
/*
The more classes we have in our software, the more complex their communication
becomes. The mediator pattern addresses this complexity by encapsulating it into
a mediator object. Objects no longer communicate directly, but rather through a
mediator object, therefore lowering the overall coupling.
*/

interface MediatorInterface {
	public function fight();
	public function talk();
	public function registerA(ColleagueA $a);
	public function registerB(ColleagueB $b);
}

class ConcreteMediator implements MediatorInterface {
	protected $talk;
	protected $fight;

	public function registerA(ColleagueA $a) {
		$this->talk = $a;
	}

	public function registerB(ColleagueB $b) {
		$this->fight = $b;
	}

	public function fight() {
		echo 'fighting...<br/>';
	}

	public function talk() {
		echo 'talking...<br/>';
	}
}

abstract class Colleague {
	protected $mediator;
	public abstract function doSomething();
}

class ColleagueA extends Colleague {
	public function __construct(MediatorInterface $mediator) {
		$this->mediator = $mediator;
		$this->mediator->registerA($this);
	}

	public function doSomething() {
		$this->mediator->talk();
	}
}

class ColleagueB extends Colleague {
	public function __construct(MediatorInterface $mediator) {
		$this->mediator = $mediator;
		$this->mediator->registerB($this);
	}

	public function doSomething() {
		$this->mediator->fight();
	}
}

$mediator = new ConcreteMediator();
$talkColleague = new ColleagueA($mediator);
$fightColleague = new ColleagueB($mediator);

$talkColleague->doSomething();
$fightColleague->doSomething();
?>

　　输出：

talking...
fighting...