private async Task becomeReady(LeaderOffer neighborLeaderOffer)
{
await dispatchEvent(ElectionEventType.READY_START).ConfigureAwait(false);
logger.debugFormat("{0} not elected leader. Watching node:{1}", leaderOffer.NodePath,
neighborLeaderOffer.NodePath);
/*
* Make sure to pass an explicit Watcher because we could be sharing this
* zooKeeper instance with someone else.
*/
var stat = await ZooKeeper.existsAsync(neighborLeaderOffer.NodePath, electionWatcher).ConfigureAwait(false);
if (stat != null)
{
logger.debugFormat("We're behind {0} in line and they're alive. Keeping an eye on them.",
neighborLeaderOffer.NodePath);
state = State.READY;
await dispatchEvent(ElectionEventType.READY_COMPLETE).ConfigureAwait(false);
}
else
{
/*
* If the stat fails, the node has gone missing between the call to
* getChildren() and exists(). We need to try and become the leader.
*/
logger.debugFormat("We were behind {0} but it looks like they died. Back to determination.",
neighborLeaderOffer.NodePath);
await determineElectionStatus().ConfigureAwait(false);
}
}
private async Task makeOffer()
{
state = State.OFFER;
await dispatchEvent(ElectionEventType.OFFER_START).ConfigureAwait(false);
leaderOffer = new LeaderOffer();
leaderOffer.HostName = HostName;
leaderOffer.NodePath = await ZooKeeper.createAsync(RootNodeName + "/" + "n_", HostName.UTF8getBytes(),
ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL).ConfigureAwait(false);
logger.debugFormat("Created leader offer {0}", leaderOffer);
await dispatchEvent(ElectionEventType.OFFER_COMPLETE).ConfigureAwait(false);
}