php设计模式 Command(命令模式)

复制代码 代码如下:

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]);
}
}
}

class Receiver
{
private $_name = null;

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

public function action()
{
echo $this->_name." action
";
}

public function action1()
{
echo $this->_name." action1
";
}
}

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

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

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

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

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("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();