/**
* 接收一条cmd
* return cmd buffer on success or null on failure
*/
public function receive()
{
$res_body = $this->_connection->receive();
if (null != $res_body) {
// 看看是否为标准错误包
$cmd_type = BigpipeFrame::get_command_type($res_body);
if (BStompFrameType::ERROR == $cmd_type) {
$recv_cmd = new BStompErrorFrame();
if ($recv_cmd->load($res_body)) {
BigpipeLog::warning("[receive error ack frame][%s][error_code:%d]", $recv_cmd->error_message, $recv_cmd->error_no);
}
return null;
}
// end of 解析error frame
}
return $res_body;
}
