[php]php设计模式 Command(命令模式)

<?php
/**
* 命令模式
*
* 将一个请求封装为一个对象从而使你可用不同的请求对客户进行参数化,对请求排除或记录请求日志,以及支持可取消的操作
*/
interface Command
{
publicfunction execute();
}

class Invoker
{
private$_command=array();
publicfunction setCommand($command) {
$this->_command[] =$command;
}

publicfunction executeCommand()
{
foreach($this->_command as$command)
{
$command->execute();
}
}

publicfunction removeCommand($command)
{
$key=array_search($command,$this->_command);
if($key!==false)
{
unset($this->_command[$key]);
}
}
}

class Receiver
{
private$_name=null;

publicfunction __construct($name) {
$this->_name =$name;
}

publicfunction action()
{
echo$this->_name." action<br/>";
}

publicfunction action1()
{
echo$this->_name." action1<br/>";
}
}

class ConcreteCommand implements Command
{
private$_receiver;
publicfunction __construct($receiver)
{
$this->_receiver =$receiver;
}

publicfunction execute()
{
$this->_receiver->action();
}
}

class ConcreteCommand1 implements Command
{
private$_receiver;
publicfunction __construct($receiver)
{
$this->_receiver =$receiver;
}

publicfunction execute()
{
$this->_receiver->action1();
}
}

class ConcreteCommand2 implements Command
{
private$_receiver;
publicfunction __construct($receiver)
{
$this->_receiver =$receiver;
}

publicfunction execute()
{
$this->_receiver->action();
$this->_receiver->action1();
}
}

$objRecevier=new Receiver("No.1");
$objRecevier1=new Receiver("No.2");
$objRecevier2=new Receiver("No.3");

$objCommand=new ConcreteCommand($objRecevier);
$objCommand1=new ConcreteCommand1($objRecevier);
$objCommand2=new ConcreteCommand($objRecevier1);
$objCommand3=new ConcreteCommand1($objRecevier1);
$objCommand4=new ConcreteCommand2($objRecevier2); // 使用 Recevier的两个方法

$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();