PHP设计模式—命令模式

/**
 * 命令抽象类
 * Interface Command
 */
interface Command
{

    /**
     * @return mixed
     */
    public function execute();
}


/**
 * 具体命令类
 * Class ConcreteCommand
 */
class ConcreteCommand implements Command
{

    /**
     * @var Receiver
     */
    protected $receiver;


    /**
     * ConcreteCommand constructor.
     * @param Receiver $receiver
     */
    public function __construct(Receiver $receiver)
    {
        $this->receiver = $receiver;
    }


    /**
     * @return mixed|void
     */
    public function execute()
    {
        // TODO: Implement execute() method.
        $this->receiver->action();
    }
}


/**
 * 命令发送者
 * Class Invoker
 */
class Invoker
{

    /**
     * @var
     */
    protected $command;


    /**
     * @param Command $command
     */
    public function setCommand(Command $command)
    {
        $this->command = $command;
    }


    /**
     * 执行
     */
    public function run()
    {
        $this->command->execute();
    }
}


/**
 * 命令接收者
 * Class Receiver
 */
class Receiver
{

    /**
     * 执行请求
     */
    public function action()
    {
        echo "执行请求";
    }
}


# 客户端代码
// 设定接收者
$receiver = new Receiver();
$command = new ConcreteCommand($receiver);

// 发送命令
$invoker = new Invoker();
$invoker->setCommand($command);
$invoker->run();