Akka.Cluster.ClusterEvent.DiffSeen C# (CSharp) Метод

        internal static ImmutableList<SeenChanged> DiffSeen(Gossip oldGossip, Gossip newGossip, UniqueAddress selfUniqueAddres)
        {
            if (newGossip.Equals(oldGossip)) 
                return ImmutableList.Create<SeenChanged>();

            var newConvergence = newGossip.Convergence(selfUniqueAddres);
            var newSeenBy = newGossip.SeenBy;
            if (newConvergence != oldGossip.Convergence(selfUniqueAddres) || newSeenBy != oldGossip.SeenBy)
                return ImmutableList.Create(new SeenChanged(newConvergence,
                        newSeenBy.Select(s => s.Address).ToImmutableHashSet()));
            return ImmutableList.Create<SeenChanged>();
        }

 private void PublishDiff(Gossip oldGossip, Gossip newGossip, Action <object> pub)
 {
     foreach (var @event in ClusterEvent.DiffMemberEvents(oldGossip, newGossip))
     {
         pub(@event);
     }
     foreach (var @event in ClusterEvent.DiffUnreachable(oldGossip, newGossip))
     {
         pub(@event);
     }
     foreach (var @event in ClusterEvent.DiffReachable(oldGossip, newGossip))
     {
         pub(@event);
     }
     foreach (var @event in ClusterEvent.DiffLeader(oldGossip, newGossip, _selfUniqueAddress))
     {
         pub(@event);
     }
     foreach (var @event in ClusterEvent.DiffRolesLeader(oldGossip, newGossip, _selfUniqueAddress))
     {
         pub(@event);
     }
     // publish internal SeenState for testing purposes
     foreach (var @event in ClusterEvent.DiffSeen(oldGossip, newGossip, _selfUniqueAddress))
     {
         pub(@event);
     }
     foreach (var @event in ClusterEvent.DiffReachability(oldGossip, newGossip))
     {
         pub(@event);
     }
 }