Akka.Persistence.Journal.MemoryJournal.Update C# (CSharp) Метод

        public Messages Update(string pid, long seqNr, Func<IPersistentRepresentation, IPersistentRepresentation> updater)
        {
            LinkedList<IPersistentRepresentation> persistents;
            if (Messages.TryGetValue(pid, out persistents))
            {
                var node = persistents.First;
                while (node != null)
                {
                    if (node.Value.SequenceNr == seqNr)
                        node.Value = updater(node.Value);

                    node = node.Next;
                }
            }

            return _messages;
        }