设计模式 | 代理模式

<?php
/**
 * Created by 憧憬.
 */
/**
 * 电脑商店约束
 * Interface ComputerShop
 */
interface ComputerShop {
    // 修理电脑
    public function repair();
    // 出售电脑
    public function sell();
}
/**
 * Dell 电脑商店
 * Class DellComputerShop
 */
class DellComputerShop implements ComputerShop {
    public function repair()
    {
        echo 'dell 电脑修理';
    }
    public function sell()
    {
        echo 'dell 电脑出售';
    }
}
/**
 * mac 电脑商店
 * Class MacComputerShop
 */
class MacComputerShop implements ComputerShop {
    public function repair()
    {
        echo 'mac 电脑修理';
    }
    public function sell()
    {
        echo 'mac 电脑出售';
    }
}
/**
 * 代理人
 * Class Proxy
 */
class Proxy implements ComputerShop
{
    public $computerShop;
    /**
     * Proxy constructor.
     * @param $computerShop
     */
    public function __construct(ComputerShop $computerShop)
    {
        $this->computerShop = $computerShop;
    }
    public function repair()
    {
        $this->computerShop->repair();
    }
    public function sell()
    {
        $this->computerShop->sell();
    }
}
//$dellProxy = new Proxy(new MacComputerShop());
$dellProxy = new Proxy(new DellComputerShop());
$dellProxy->repair();