PHP设计模式之中介者模式浅析（中介者模式的定义和特点）深度揭秘

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<?php
// 抽象中介者
abstract class Mediator
{
abstract public function send($message, $colleague);
}
// 抽象同事类
abstract class Colleague
{
protected $mediator;
public function __construct(Mediator $mediator)
{
$this->mediator=$mediator;
}
abstract public function send($message);
abstract public function receive($message);
}
// 具体中介者
class ConcreteMediator extends Mediator
{
private $colleague1;
private $colleague2;
public function setColleague1(Colleague $colleague)
{
$this->colleague1=$colleague;
}
public function setColleague2(Colleague $colleague)
{
$this->colleague2=$colleague;
}
public function send($message, $colleague)
{
if ($colleague==$this->colleague1) {
$this->colleague2->receive($message);
} else {
$this->colleague1->receive($message);
}
}
}
// 具体同事类
class ConcreteColleague1 extends Colleague
{
public function send($message)
{
$this->mediator->send($message, $this);
}
public function receive($message)
{
echo “ConcreteColleague1 received message: $message\n”;
}
}
class ConcreteColleague2 extends Colleague
{
public function send($message)
{
$this->mediator->send($message, $this);
}
public function receive($message)
{
echo “ConcreteColleague2 received message: $message\n”;
}
}