门面模式

随便写的一个门面模式  但是又有点注入子系统的功能  先记下吧.

<?php
/**门面设计模式
 * 
 */

abstract class Trad {
    public function buy() {}
}
class Proxy{

    private $system = [];
    /**
     * 注册子系统
     *
     * @return void
     */
    public function register($class) {
        $this->system[] = function () use ($class){
            return new $class();
        };
    }

    public function buy() {

        foreach($this->system as $v) {
            $system = $v();

            if(method_exists($system,'buy')) {

                $system->buy();
            } else {
                echo '方法不存在!';
            }
        }
    }
    
}

class Ali extends Trad {
    public function buy () {
        echo 'buy ali';
    }
}
class DangDang extends Trad {
    public function buy () {
        echo 'buy dangdang';
    }
}
class Jd extends Trad {
    public function buy () {
        echo 'buy jd';
    }
}

$proxy = new proxy();
$proxy->register(Ali::class);
$proxy->register(DangDang::class);
$proxy->register(Jd::class);


$proxy->buy();