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

文章摘要

这篇文章展示了一个PHP代码示例，用于实现中介者模式（Mediator Pattern）。代码中定义了两个抽象类：`Mediator`和`Colleague`，以及它们的具体实现`ConcreteMediator`和两个`ConcreteColleague`类。中介者模式通过`send`方法将消息从一个同事传递到另一个同事，具体取决于调用`send`方法的同事类型。代码通过设置不同的同事实例，实现了消息传递的灵活性。文章的核心内容在于展示如何通过中介者模式实现组件之间的高效通信机制。

<?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”;
}
}