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HomeBackend DevelopmentPHP Tutorial学习php设计模式 php实现门面模式(Facade)_PHP

一、意图
为子系统中的一组接口提供一个一致的界面,Facade模式定义了一个高层次的接口,使得子系统更加容易使用【GOF95】
外部与子系统的通信是通过一个门面(Facade)对象进行。
二、门面模式结构图

三、门面模式中主要角色
门面(Facade)角色:
此角色将被客户端调用
知道哪些子系统负责处理请求
将用户的请求指派给适当的子系统

子系统(subsystem)角色:
实现子系统的功能
处理由Facade对象指派的任务
没有Facade的相关信息,可以被客户端直接调用
可以同时有一个或多个子系统,每个子系统都不是一个单独的类,而一个类的集合。每个子系统都可以被客户端直接调用,或者被门面角色调用。子系统并知道门面模式的存在,对于子系统而言,门面仅仅是另一个客户端。
四、门面模式的优点
1、它对客户屏蔽了子系统组件,因而减少了客户处理的对象的数目并使得子系统使用起来更加方便
2、实现了子系统与客户之间的松耦合关系
3、如果应用需要,它并不限制它们使用子系统类。因此可以在系统易用性与能用性之间加以选择
五、门面模式适用场景
1、为一些复杂的子系统提供一组接口
2、提高子系统的独立性
3、在层次化结构中,可以使用门面模式定义系统的每一层的接口
六、门面模式与其它模式
抽象工厂模式(abstract factory模式):
Abstract Factory模式可以与Facade模式一起使用以提供一个接口,这一接口可用来以一种子系统独立的方式创建子系统对象。Abstract Factory模式也可以代替Facade模式隐藏那些与平台相关的类
调停者模式:Mediator模式与Facade模式的相似之处是,它抽象了一些已有类的功能。然而,Mediator目的是对同事之间的任意通讯进行抽象,通常集中不属于任何单个对象的功能。Mediator的同事对象知道中介者并与它通信,而不是直接与其他同类对象通信。相对而言,Facade模式仅对子系统对象的接口进行抽象,从而使它们更容易使用;它并定义不功能,子系统也不知道facade的存在
单例模式(singleton模式):一般来说,仅需要一个Facade对象,因此Facade对象通常属于Singleton对象。
七、门面模式PHP示例

<&#63;php
class Camera {
 
 /**
  * 打开录像机
  */
 public function turnOn() {
  echo 'Turning on the camera.<br />';
 }
 
 /**
  * 关闭录像机
  */
 public function turnOff() {
  echo 'Turning off the camera.<br />';
 }
 
 /**
  * 转到录像机
  * @param <type> $degrees
  */
 public function rotate($degrees) {
  echo 'rotating the camera by ', $degrees, ' degrees.<br />';
 }
}
 
class Light {
 
 /**
  * 开灯
  */
 public function turnOn() {
  echo 'Turning on the light.<br />';
 }
 
 /**
  * 关灯
  */
 public function turnOff() {
  echo 'Turning off the light.<br />';
 }
 
 /**
  * 换灯泡
  */
 public function changeBulb() {
  echo 'changing the light-bulb.<br />';
 }
}
 
class Sensor {
 
 /**
  * 启动感应器
  */
 public function activate() {
  echo 'Activating the sensor.<br />';
 }
 
 /**
  * 关闭感应器
  */
 public function deactivate() {
  echo 'Deactivating the sensor.<br />';
 }
 
 /**
  * 触发感应器
  */
 public function trigger() {
  echo 'The sensor has been trigged.<br />';
 }
}
 
class Alarm {
 
 /**
  * 启动警报器
  */
 public function activate() {
  echo 'Activating the alarm.<br />';
 }
 
 /**
  * 关闭警报器
  */
 public function deactivate() {
  echo 'Deactivating the alarm.<br />';
 }
 
 /**
  * 拉响警报器
  */
 public function ring() {
  echo 'Ring the alarm.<br />';
 }
 
 /**
  * 停掉警报器
  */
 public function stopRing() {
  echo 'Stop the alarm.<br />';
 }
}
 
/**
 * 门面类
 */
class SecurityFacade {
 
 /* 录像机 */
 private $_camera1, $_camera2;
 
 /* 灯 */
 private $_light1, $_light2, $_light3;
 
 /* 感应器 */
 private $_sensor;
 
 /* 警报器 */
 private $_alarm;
 
 public function __construct() {
  $this->_camera1 = new Camera();
  $this->_camera2 = new Camera();
 
  $this->_light1 = new Light();
  $this->_light2 = new Light();
  $this->_light3 = new Light();
 
  $this->_sensor = new Sensor();
  $this->_alarm = new Alarm();
 }
 
 public function activate() {
  $this->_camera1->turnOn();
  $this->_camera2->turnOn();
 
  $this->_light1->turnOn();
  $this->_light2->turnOn();
  $this->_light3->turnOn();
 
  $this->_sensor->activate();
  $this->_alarm->activate();
 }
 
 public function deactivate() {
  $this->_camera1->turnOff();
  $this->_camera2->turnOff();
 
  $this->_light1->turnOff();
  $this->_light2->turnOff();
  $this->_light3->turnOff();
 
  $this->_sensor->deactivate();
  $this->_alarm->deactivate();
 }
}
 
 
/**
 * 客户端
 */
class Client {
 
 private static $_security;
  /**
  * Main program.
  */
 public static function main() {
  self::$_security = new SecurityFacade();
  self::$_security->activate();
 }
}
 
Client::main();
&#63;>

以上就是使用php实现门面模式的代码,还有一些关于门面模式的概念区分,希望对大家的学习有所帮助。

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