Akka.Cluster.Tools.PublishSubscribe.DistributedPubSubMediator.HandlePrune C# (CSharp) Method

        private void HandlePrune()
        {
            foreach (var entry in _registry)
            {
                var owner = entry.Key;
                var bucket = entry.Value;

                var oldRemoved = bucket.Content
                    .Where(kv => (bucket.Version - kv.Value.Version) > _settings.RemovedTimeToLive.TotalMilliseconds)
                    .Select(kv => kv.Key);

                if (oldRemoved.Any())
                {
                    _registry.Add(owner, new Bucket(bucket.Owner, bucket.Version, bucket.Content.RemoveRange(oldRemoved)));
                }
            }
        }