void LeaderContenderProcess::cancelled(const Future<bool>& result)
{
CHECK_READY(candidacy);
LOG(INFO) << "Membership cancelled: " << candidacy->id();
// Can be called as a result of either withdraw() or server side
// expiration.
CHECK(withdrawing.isSome() || watching.isSome());
CHECK(!result.isDiscarded());
if (result.isFailed()) {
if (withdrawing.isSome()) {
withdrawing.get()->fail(result.failure());
}
if (watching.isSome()) {
watching.get()->fail(result.failure());
}
} else {
if (withdrawing.isSome()) {
withdrawing.get()->set(result);
}
if (watching.isSome()) {
watching.get()->set(Nothing());
}
}
}
void LeaderContenderProcess::cancel()
{
if (!candidacy.isReady()) {
// Nothing to cancel.
if (withdrawing.isSome()) {
withdrawing.get()->set(false);
}
return;
}
LOG(INFO) << "Now cancelling the membership: " << candidacy->id();
group->cancel(candidacy.get())
.onAny(defer(self(), &Self::cancelled, lambda::_1));
}
void LeaderContenderProcess::joined()
{
CHECK(!candidacy.isDiscarded());
// Cannot be watching because the candidacy is not obtained yet.
CHECK_NONE(watching);
CHECK_SOME(contending);
if (candidacy.isFailed()) {
// The promise 'withdrawing' will be set to false in cancel().
contending.get()->fail(candidacy.failure());
return;
}
if (withdrawing.isSome()) {
LOG(INFO) << "Joined group after the contender started withdrawing";
// The promise 'withdrawing' will be set to 'false' in subsequent
// 'cancel()' call.
return;
}
LOG(INFO) << "New candidate (id='" << candidacy->id()
<< "') has entered the contest for leadership";
// Transition to 'watching' state.
watching = new Promise<Nothing>();
// Notify the client.
if (contending.get()->set(watching.get()->future())) {
// Continue to watch that our membership is not removed (if the
// client still cares about it).
candidacy->cancelled()
.onAny(defer(self(), &Self::cancelled, lambda::_1));
}
}