PHP命令Command模式用法實(shí)例分析

public interface Command {
  public void execute();
}

Public void test(Command para){
  Para.execute();
}

?php
  /**
   * 命令模式
   *
   * 將一個(gè)請(qǐng)求封裝為一個(gè)對(duì)象從而使你可用不同的請(qǐng)求對(duì)客戶進(jìn)行參數(shù)化,對(duì)請(qǐng)求排除或記錄請(qǐng)求日志,以及支持可取消的操作
   */
  // 命令接口
  interface Command
  {
    public function execute();
  }
  class Invoker
  {
    private $_command = array();
    public function setCommand($command) {
      $this->_command[] = $command;
    }
    public function executeCommand()
    {
      foreach($this->_command as $command)
      {
        $command->execute();
      }
    }
    public function removeCommand($command)
    {
      $key = array_search($command, $this->_command);
      if($key !== false)
      {
        unset($this->_command[$key]);
      }
    }
  }
  // 命令接受者
  class Receiver
  {
    private $_name = null;
    public function __construct($name) {
      $this->_name = $name;
    }
    public function action()
    {
       echo $this->_name." 執(zhí)行攻擊命令（action）br />";
    }
    public function action1()
    {
      echo $this->_name." 執(zhí)行防御命令（action1）br/>";
    }
  }
  // 具體的命令
  class ConcreteCommand implements Command
  {
    private $_receiver;
    public function __construct($receiver)
    {
      $this->_receiver = $receiver;
    }
    public function execute()
    {
      $this->_receiver->action();
    }
  }
  // 具體命令1
  class ConcreteCommand1 implements Command
  {
    private $_receiver;
    public function __construct($receiver)
    {
      $this->_receiver = $receiver;
    }
    public function execute()
    {
      $this->_receiver->action1();
    }
  }
  // 具體命令2
  class ConcreteCommand2 implements Command
  {
    private $_receiver;
    public function __construct($receiver)
    {
      $this->_receiver = $receiver;
    }
    public function execute()
    {
      $this->_receiver->action();
      $this->_receiver->action1();
    }
  }
  $objRecevier = new Receiver("小狗");
  $objRecevier1 = new Receiver("刺蛇");
  $objRecevier2 = new Receiver("雷獸");
  $objCommand = new ConcreteCommand($objRecevier);
  $objCommand1 = new ConcreteCommand1($objRecevier);
  $objCommand2 = new ConcreteCommand($objRecevier1);
  $objCommand3 = new ConcreteCommand1($objRecevier1);
  $objCommand4 = new ConcreteCommand2($objRecevier2); // 使用 Recevier的兩個(gè)方法
  $objInvoker = new Invoker();
  $objInvoker->setCommand($objCommand);
  $objInvoker->setCommand($objCommand1);
  $objInvoker->executeCommand();
  $objInvoker->removeCommand($objCommand1);
  $objInvoker->executeCommand();
  $objInvoker->setCommand($objCommand2);
  $objInvoker->setCommand($objCommand3);
  $objInvoker->setCommand($objCommand4);
  $objInvoker->executeCommand();
?>