代理模式

代理模式:为其他对象提供一种代理以控制对这个对象的访问

interface GiveGift
{

    function  giveDolls();
    function  giveFlowers();
    function  giveChocolate();

}

class Pretty
{

    public $name;

    public  function __construct($name)
    {
        $this->name = $name;
    }

}

class Pursuit implements GiveGift
{
    private  $pretty ;

    public  function __construct($pretty)
    {
        $this->pretty = $pretty;
    }

    public  function giveDolls()
   {
       echo $this->pretty->name. '送你洋娃娃<br>';
   }

   public  function giveFlowers()
   {
       echo $this->pretty->name. '送你花<br>';
   }

   public  function giveChocolate()
   {

       echo $this->pretty->name. '送你巧克力<br>';
   }


}

class Proxy implements GiveGift
{

    private  $pursuit;

    public  function __construct($pretty)
    {
        $this->pursuit = new Pursuit($pretty);
    }

    public  function giveDolls()
    {
       $this->pursuit->giveDolls();
    }

    public  function giveFlowers()
    {
        $this->pursuit->giveFlowers();
    }


    public  function giveChocolate()
    {
        $this->pursuit->giveChocolate();
    }
}

$pretty = new Pretty('lucy');

$proxy   = new Proxy($pretty);

$proxy->giveDolls();
$proxy->giveFlowers();
$proxy->giveChocolate();

代理模式应用:代理一般分为四种:

远程代理：也就是为一个对象在不同的地址空间提供局部代表。这样可以隐藏一个对象存在于不同地址空间
虚拟代理:根据需要创建开销很大的对象。通过它来存放实例化需要很长时间的真实对象
安全代理:用来控制真实对象访问时的权限
智能指引:当调用真实的对象时,代理处理另外一些事