public bool IsObedientFollower(Followership follower)
{
return(Tock <= follower.Tock + FollowershipLeeway);
}
public bool IsDeadFollower(Followership follower)
{
return((Term == follower.Term && Tock > follower.Tock + FollowershipInsolence) ||
(Term > follower.Term && Tock > FollowershipInsolence));
}
void Follow()
{
using (var session = RavenFactory.OpenSession())
{
var l = session.Advanced.Lazily.Load <Leadership>(Leadership.Identifier);
var m = session.Advanced.Lazily.Load <Followership>(Followership.FormatId(ProcessIdentity));
session.Advanced.Eagerly.ExecuteAllPendingLazyOperations();
var leadership = l.Value ?? new Leadership();
var me = m.Value;
if (me == null)
{
me = new Followership(ProcessIdentity);
session.Store(me);
}
if (leadership.Status == Leadership.ClusterStatus.Turmoil ||
leadership.DeniedAssignment(ProcessIdentity))
{
while (_workQueue.Count > 0)
{
RavenTransportMessage trash;
_workQueue.TryTake(out trash); //clear the queue
}
Thread.Sleep(10); //make sure workers have enough time to get their work in the InProgress collection
RecentMessages.Clear(); //we're clearing the decks, so forget what we've seen and rely on db
}
if (RecentMessages.Count == 0)
{
me.LastSequenceNumber = 0;
}
if (leadership.Status == Leadership.ClusterStatus.Harmony &&
leadership.HasAssignment(ProcessIdentity))
{
var assignment = leadership.GetAssignment(ProcessIdentity);
var take = MaxMessagesToRead - _workQueue.Count;
RavenQueryStatistics stats = null;
var messages =
session.Query <RavenTransportMessage, RavenTransportMessageIndex>()
.Statistics(out stats)
.Where(x => x.Destination == _address.Queue)
.Where(x => x.ClaimTicket >= assignment.LowerBound && x.ClaimTicket <= assignment.UpperBound)
.Where(x => x.SequenceNumber >= me.LastSequenceNumber)
.OrderBy(x => x.SequenceNumber)
.Take(take)
.ToList();
Console.WriteLine("Follower Query Stats: {0:N0}", stats.DurationMilliseconds);
messages = messages.Where(x => !RecentMessages.Contains(x.Id)).ToList();
messages.ForEach(_workQueue.Add);
messages.Select(x => x.Id).ToList().ForEach(RecentMessages.Enqueue);
if (messages.Any())
{
me.LastSequenceNumber = messages.Last().SequenceNumber;
}
}
var progress = InProgress.Select(x => x.Value).Where(x => !string.IsNullOrWhiteSpace(x)).ToList();
me.MakeReportForLeader(leadership, progress);
session.SaveChanges();
}
}
