功能:

給指定用戶發送郵件

將客戶端ip寫入ftp防火墻白名單

為什麽要用命令模式實現?策略模式,狀態模式難道不可以嗎?

此處給用戶發郵件和將IP寫入白名單是兩個不同的操作.

策略模式是不同策略可以相互替換,這兒顯然不能替換,因為對應的功能不同.

命令請求者內部沒有維護一個狀態的必要.所以狀態模式也不適應.

一.命令接口

abstract class SystemCommandInterface
{
    protected $receiver;

    public function __construct(ReceiverInterface $receiver)
    {
        $this->receiver = $receiver;
    }

    abstract public function execute(array $params);
    abstract public function log(array $params);
}

二.具體命令

1.發送郵件命令

/**
 * 發送郵件
 * Class SendEmail
 */
class SendEmail extends SystemCommandInterface
{
    public function execute(array $params)
    {
        $this->log($params);
        return $this->receiver->action($params);
    }

    public function log(array $params)
    {
        echo "向{$params[‘email‘]}發送了郵件<br/>";
    }

}

2.ip寫入ftp白名單命令

/**
 * 接受ftp 客戶端IP
 */
class AcceptFTPClientIp extends SystemCommandInterface
{
    public function execute(array $params)
    {
        $this->log($params);
        return $this->receiver->action($params);
    }

    public function log(array $params)
    {
        echo "請求接受ftp 客戶端IP: {$params[‘ip‘]}<br/>";
    }

}

三.命令接受者

1.接口

interface ReceiverInterface
{
    public function action(array $params);
}

2.發送郵件命令接受者

/**
 * Class SendMailReceiver
 */
class SendMailReceiver implements ReceiverInterface
{
    public function action(array $params)
    {
        /**
         * 發送郵件
         * ..........
         * ........
         */
        return true;
    }
}

3.接受ip命令接受者

class AcceptFTPClientIpReceiver implements ReceiverInterface
{
    public function action(array $params)
    {
        /**
         * 將請求的ip寫入ftp ip 白名單
         * ..........
         * ........
         */
        return false;
    }
}

四.命令請求者

/**
 * 命令請求者
 * Class Invoker
 */
class Invoker
{
    private $systemCommandS = [];

    public function setCommands($key, SystemCommandInterface $commandInterface)
    {
        if (!isset($this->systemCommandS[$key])) {
            $this->systemCommandS[$key] = $commandInterface;
        }
    }

    public function call($key, $params)
    {
        $this->systemCommandS[$key]->execute($params);
    }
}

五.調用

$sendMailCommand = new SendEmail(new SendMailReceiver());
$acceptFTPClientIpCommand = new AcceptFTPClientIp(new AcceptFTPClientIpReceiver());

$invoker = new Invoker();
$invoker->setCommands(‘send_email‘, $sendMailCommand);
$invoker->setCommands(‘accept_ftp_client_ip‘, $acceptFTPClientIpCommand);

$invoker->call(‘send_email‘, [‘email‘ => ‘[email protected]‘]);
$invoker->call(‘accept_ftp_client_ip‘, [‘ip‘ => ‘127.0.0.1‘]);

命令模式使用實例