/**
* 发送请求
*
* @param string $method 方法名（Instance->Method | Class:Method）
* @param array $params 参数
* @param mixed $variable 回传变量
* @param callback $callback 回调函数
* @param inteter $expiry 应答过期时间
* @return integer 序号
*/
public function start_request($method, $params, &$variable = NULL, $callback = NULL, $expiry = NULL)
{
if ($expiry === NULL) {
$expiry = $this->expiry;
}
$sequence = $this->store_request($method, $params, $variable, $callback, $expiry);
if (APS::get_instance()->get_zmq_enabled()) {
$timestamp = APS_Functions::aps_millitime();
$frames[] = '';
$frames[] = self::VERSION;
$frames[] = msgpack_pack(array($sequence, $timestamp, $expiry));
$frames[] = $method;
$frames[] = msgpack_pack($params);
APS_Functions::aps_send_frames($this->socket, $frames);
}
return $sequence;
}
