PHP design mode Mediator (mediator mode)

Copy CodeThe code is as follows:
<?php
/**
* Intermediary mode
*
* Use a Mediation object to encapsulate a series of object interactions so that the objects do not need to be explicitly referenced to each other so that they are loosely coupled and can independently change their interactions
*/
Abstract class Mediator
{
Abstract public Function Send ($message, $colleague);
}
Abstract class Colleague
{
Private $_mediator = null;
Public Function colleague ($mediator)
{
$this->_mediator = $mediator;
}
Public function Send ($message)
{
$this->_mediator->send ($message, $this);
}
Abstract Public Function notify ($message);
}
Class Concretemediator extends Mediator
{
Private $_colleague1 = null;
Private $_colleague2 = null;
Public function Send ($message, $colleague)
{
if ($colleague = = $this->_colleague1)
{
$this->_colleague1->notify ($message);
} else {
$this->_colleague2->notify ($message);
}
}
Public function set ($colleague 1, $colleague 2)
{
$this->_colleague1 = $colleague 1;
$this->_colleague2 = $colleague 2;
}
}
Class Colleague1 extends colleague
{
Public function Notify ($message)
{
echo "Colleague1 message is:". $message. " <br/> ";
}
}
Class Colleague2 extends colleague
{
Public function Notify ($message)
{
echo "Colleague2 message is:". $message. " <br/> ";
}
}
//
$objMediator = new Concretemediator ();
$objC 1 = new Colleague1 ($objMediator);
$objC 2 = new Colleague2 ($objMediator);
$objMediator->set ($objC 1, $objC 2);
$objC 1->send ("to C2 from C1");
$objC 2->send ("to C1 from C2");