protected void AddServer(SiloAddress silo)
{
lock (this.writeLock)
{
var existing = this.directoryMembership;
if (existing.MembershipCache.Contains(silo))
{
// we have already cached this silo
return;
}
// insert new silo in the sorted order
long hash = silo.GetConsistentHashCode();
// Find the last silo with hash smaller than the new silo, and insert the latter after (this is why we have +1 here) the former.
// Notice that FindLastIndex might return -1 if this should be the first silo in the list, but then
// 'index' will get 0, as needed.
int index = existing.MembershipRingList.FindLastIndex(siloAddr => siloAddr.GetConsistentHashCode() < hash) + 1;
this.directoryMembership = new DirectoryMembership(
existing.MembershipRingList.Insert(index, silo),
existing.MembershipCache.Add(silo));
HandoffManager.ProcessSiloAddEvent(silo);
AdjustLocalDirectory(silo, dead: false);
AdjustLocalCache(silo, dead: false);
if (log.IsEnabled(LogLevel.Debug))
{
log.Debug("Silo {0} added silo {1}", MyAddress, silo);
}
}
}
protected void RemoveServer(SiloAddress silo, SiloStatus status)
{
lock (this.writeLock)
{
try
{
// Only notify the catalog once. Order is important: call BEFORE updating membershipRingList.
this.catalogOnSiloRemoved?.Invoke(silo, status);
}
catch (Exception exc)
{
log.Error(ErrorCode.Directory_SiloStatusChangeNotification_Exception,
String.Format("CatalogSiloStatusListener.SiloStatusChangeNotification has thrown an exception when notified about removed silo {0}.", silo.ToStringWithHashCode()), exc);
}
var existing = this.directoryMembership;
if (!existing.MembershipCache.Contains(silo))
{
// we have already removed this silo
return;
}
// the call order is important
HandoffManager.ProcessSiloRemoveEvent(silo);
this.directoryMembership = new DirectoryMembership(
existing.MembershipRingList.Remove(silo),
existing.MembershipCache.Remove(silo));
AdjustLocalDirectory(silo, dead: true);
AdjustLocalCache(silo, dead: true);
if (log.IsEnabled(LogLevel.Debug))
{
log.Debug("Silo {0} removed silo {1}", MyAddress, silo);
}
}
}
