Akka.Routing.SmallestMailboxRoutingLogic.SelectNext C# (CSharp) Method

        private Routee SelectNext(Routee[] routees)
        {
            var winningScore = long.MaxValue;

            // round robin fallback
            var winner = routees[(Interlocked.Increment(ref _next) & int.MaxValue) %  routees.Length];

            for (int i = 0; i < routees.Length; i++)
            {
                var routee = routees[i];
                var cell = TryGetActorCell(routee);
                if (cell != null)
                {
                    // routee can be reasoned about it's mailbox size
                    var score = cell.NumberOfMessages;
                    if (score == 0)
                    {
                        // no messages => instant win    
                        return routee;
                    }

                    if (winningScore > score)
                    {
                        winningScore = score;
                        winner = routee;
                    }
                }
            }

            return winner;
        }