public function __construct(StreamProcess $child)
{
$this->child = $child;
$this->protocol = new RpcProtocol($this->child->getReadStream(), $this->child->getWriteStream(), $this->child->getErrorStream(), Factory::create());
$this->output = '';
$output =& $this->output;
$this->protocol->registerOutputCallback(function ($out) use(&$output) {
$output .= $out;
});
}
