Microsoft.AspNet.SignalR.Messaging.ScaleoutSubscription.PerformWork C# (CSharp) Method

        protected override void PerformWork(IList<ArraySegment<Message>> items, out int totalCount, out object state)
        {
            // The list of cursors represent (streamid, payloadid)
            var nextCursors = new ulong?[_cursors.Count];
            totalCount = 0;

            // Get the enumerator so that we can extract messages for this subscription
            IEnumerator<Tuple<ScaleoutMapping, int>> enumerator = GetMappings().GetEnumerator();

            while (totalCount < MaxMessages && enumerator.MoveNext())
            {
                ScaleoutMapping mapping = enumerator.Current.Item1;
                int streamIndex = enumerator.Current.Item2;

                ulong? nextCursor = nextCursors[streamIndex];

                // Only keep going with this stream if the cursor we're looking at is bigger than
                // anything we already processed
                if (nextCursor == null || mapping.Id > nextCursor)
                {
                    ulong mappingId = ExtractMessages(streamIndex, mapping, items, ref totalCount);

                    // Update the cursor id
                    nextCursors[streamIndex] = mappingId;
                }
            }

            state = nextCursors;
        }