Microsoft.AspNet.SignalR.Messaging.DefaultSubscription.DefaultSubscription C# (CSharp) Method

        public DefaultSubscription(string identity,
                                   IList<string> eventKeys,
                                   TopicLookup topics,
                                   string cursor,
                                   Func<MessageResult, object, Task<bool>> callback,
                                   int maxMessages,
                                   IStringMinifier stringMinifier,
                                   IPerformanceCounterManager counters,
                                   object state) :
            base(identity, eventKeys, callback, maxMessages, counters, state)
        {
            _stringMinifier = stringMinifier;

            if (String.IsNullOrEmpty(cursor))
            {
                _cursors = GetCursorsFromEventKeys(EventKeys, topics);
            }
            else
            {
                // Ensure delegate continues to use the C# Compiler static delegate caching optimization.
                _cursors = Cursor.GetCursors(cursor, _defaultCursorPrefix, (k, s) => UnminifyCursor(k, s), stringMinifier) ?? GetCursorsFromEventKeys(EventKeys, topics);
            }

            _cursorTopics = new List<Topic>();

            if (!String.IsNullOrEmpty(cursor))
            {
                // Update all of the cursors so we're within the range
                for (int i = _cursors.Count - 1; i >= 0; i--)
                {
                    Cursor c = _cursors[i];
                    Topic topic;
                    if (!EventKeys.Contains(c.Key))
                    {
                        _cursors.Remove(c);
                    }
                    else if (!topics.TryGetValue(_cursors[i].Key, out topic) || _cursors[i].Id > topic.Store.GetMessageCount())
                    {
                        UpdateCursor(c.Key, 0);
                    }
                }
            }

            // Add dummy entries so they can be filled in
            for (int i = 0; i < _cursors.Count; i++)
            {
                _cursorTopics.Add(null);
            }
        }