PHP设计模式 - 中介者模式

<?phpabstract class Mediator { // 中介者角色 ???abstract public function send($message,$colleague); } abstract class Colleague { // 抽象对象 ???private $_mediator = null; ????public function __construct($mediator) { ????????$this->_mediator = $mediator; ????} ????public function send($message) { ????????$this->_mediator->send($message,$this); ????} ????abstract public function notify($message); } class ConcreteMediator extends Mediator { // 具体中介者角色 ???private $_colleague1 = null; ????private $_colleague2 = null; ????public function send($message,$colleague) { ???????//echo $colleague->notify($message); ???????if($colleague == $this->_colleague1) { ????????????$this->_colleague1->notify($message); ????????} else { ????????????$this->_colleague2->notify($message); ????????} ????} ???public function set($colleague1,$colleague2) { ????????$this->_colleague1 = $colleague1; ????????$this->_colleague2 = $colleague2; ????} } class Colleague1 extends Colleague { // 具体对象角色 ???public function notify($message) { ???????echo ‘colleague1：‘.$message."<br>"; ???} } class Colleague2 extends Colleague { // 具体对象角色 ???public function notify($message) { ????????echo ‘colleague2：‘.$message."<br>"; ???} } // client$objMediator = new ConcreteMediator(); $objC1 = new Colleague1($objMediator); $objC2 = new Colleague2($objMediator); $objMediator->set($objC1,$objC2); $objC1->send("to c2 from c1"); //输出：colleague1：to c2 from c1$objC2->send("to c1 from c2"); //输出：colleague2：to c1 from c2