Method sub

src/brpc/controller.cpp:1392–1400

}

const Controller* Controller::sub(int index) const {
    if (_pchan_sub_count > 0 && _done != NULL) {
        return GetSubControllerOfParallelChannel(_done, index);
    }
    if (_sender != NULL) {
        return GetSubControllerOfSelectiveChannel(_sender, index);
    }
    return NULL;
}

uint64_t Controller::trace_id() const {
    if (auto span = _span.lock()) {