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<?php
namespace light\Easemob\Message;
use light\Easemob\Exception\InvalidArgumentException;
class Cmd extends Message
{
/**
* Message type.
*
* @var string
*/
protected $type = self::TYPE_CMD;
protected $properties = ['action'];
* @inheritdoc
protected function validateSelf()
parent::validateSelf();
foreach($this->properties as $prop) {
if (empty($this->{$prop})) {
throw new InvalidArgumentException("{$prop} can not be null");
}