Method detected

src/master/detector/zookeeper.cpp:154–186

void ZooKeeperMasterDetectorProcess::detected(
    const Future<Option<Group::Membership>>& _leader)
{
  CHECK(!_leader.isDiscarded());

  if (_leader.isFailed()) {
    LOG(ERROR) << "Failed to detect the leader: " << _leader.failure();

    // Setting this error stops the detection loop and the detector
    // transitions to an erroneous state. Further calls to detect()
    // will directly fail as a result.
    error = Error(_leader.failure());
    leader = None();

    failPromises(&promises, _leader.failure());

    return;
  }

  if (_leader->isNone()) {
    leader = None();

    setPromises(&promises, leader);
  } else {
    // Fetch the data associated with the leader.
    group->data(_leader->get())
      .onAny(defer(self(), &Self::fetched, _leader->get(), lambda::_1));
  }

  // Keep trying to detect leadership changes.
  detector.detect(_leader.get())
    .onAny(defer(self(), &Self::detected, lambda::_1));
}


void ZooKeeperMasterDetectorProcess::fetched(