Esempio n. 1
0
        public LeaderReplicationService(
            IPublisher publisher,
            Guid instanceId,
            TFChunkDb db,
            IPublisher tcpSendPublisher,
            IEpochManager epochManager,
            int clusterSize,
            bool unsafeAllowSurplusNodes,
            QueueStatsManager queueStatsManager)
        {
            Ensure.NotNull(publisher, "publisher");
            Ensure.NotEmptyGuid(instanceId, "instanceId");
            Ensure.NotNull(db, "db");
            Ensure.NotNull(tcpSendPublisher, "tcpSendPublisher");
            Ensure.NotNull(epochManager, "epochManager");
            Ensure.Positive(clusterSize, "clusterSize");

            _publisher               = publisher;
            _instanceId              = instanceId;
            _db                      = db;
            _tcpSendPublisher        = tcpSendPublisher;
            _epochManager            = epochManager;
            _clusterSize             = clusterSize;
            _unsafeAllowSurplusNodes = unsafeAllowSurplusNodes;
            _queueStats              = queueStatsManager.CreateQueueStatsCollector("Leader Replication Service");

            _lastRolesAssignmentTimestamp = _stopwatch.Elapsed;
            _mainLoopThread = new Thread(MainLoop)
            {
                Name = _queueStats.Name, IsBackground = true
            };
        }
Esempio n. 2
0
        public StorageReaderService(
            IPublisher bus,
            ISubscriber subscriber,
            IReadIndex readIndex,
            int threadCount,
            IReadOnlyCheckpoint writerCheckpoint,
            QueueStatsManager queueStatsManager)
        {
            Ensure.NotNull(bus, "bus");
            Ensure.NotNull(subscriber, "subscriber");
            Ensure.NotNull(readIndex, "readIndex");
            Ensure.Positive(threadCount, "threadCount");
            Ensure.NotNull(writerCheckpoint, "writerCheckpoint");

            _bus         = bus;
            _readIndex   = readIndex;
            _threadCount = threadCount;
            StorageReaderWorker[] readerWorkers      = new StorageReaderWorker[threadCount];
            InMemoryBus[]         storageReaderBuses = new InMemoryBus[threadCount];
            for (var i = 0; i < threadCount; i++)
            {
                readerWorkers[i]      = new StorageReaderWorker(bus, readIndex, writerCheckpoint, i);
                storageReaderBuses[i] = new InMemoryBus("StorageReaderBus", watchSlowMsg: false);
                storageReaderBuses[i].Subscribe <ClientMessage.ReadEvent>(readerWorkers[i]);
                storageReaderBuses[i].Subscribe <ClientMessage.ReadStreamEventsBackward>(readerWorkers[i]);
                storageReaderBuses[i].Subscribe <ClientMessage.ReadStreamEventsForward>(readerWorkers[i]);
                storageReaderBuses[i].Subscribe <ClientMessage.ReadAllEventsForward>(readerWorkers[i]);
                storageReaderBuses[i].Subscribe <ClientMessage.ReadAllEventsBackward>(readerWorkers[i]);
                storageReaderBuses[i].Subscribe <ClientMessage.FilteredReadAllEventsForward>(readerWorkers[i]);
                storageReaderBuses[i].Subscribe <ClientMessage.FilteredReadAllEventsBackward>(readerWorkers[i]);
                storageReaderBuses[i].Subscribe <StorageMessage.BatchLogExpiredMessages>(readerWorkers[i]);
                storageReaderBuses[i].Subscribe <StorageMessage.EffectiveStreamAclRequest>(readerWorkers[i]);
                storageReaderBuses[i].Subscribe <StorageMessage.StreamIdFromTransactionIdRequest>(readerWorkers[i]);
            }

            _workersMultiHandler = new MultiQueuedHandler(
                _threadCount,
                queueNum => new QueuedHandlerThreadPool(storageReaderBuses[queueNum],
                                                        string.Format("StorageReaderQueue #{0}", queueNum + 1),
                                                        queueStatsManager,
                                                        groupName: "StorageReaderQueue",
                                                        watchSlowMsg: true,
                                                        slowMsgThreshold: TimeSpan.FromMilliseconds(200)));
            _workersMultiHandler.Start();

            subscriber.Subscribe(_workersMultiHandler.WidenFrom <ClientMessage.ReadEvent, Message>());
            subscriber.Subscribe(_workersMultiHandler.WidenFrom <ClientMessage.ReadStreamEventsBackward, Message>());
            subscriber.Subscribe(_workersMultiHandler.WidenFrom <ClientMessage.ReadStreamEventsForward, Message>());
            subscriber.Subscribe(_workersMultiHandler.WidenFrom <ClientMessage.ReadAllEventsForward, Message>());
            subscriber.Subscribe(_workersMultiHandler.WidenFrom <ClientMessage.ReadAllEventsBackward, Message>());
            subscriber.Subscribe(_workersMultiHandler.WidenFrom <ClientMessage.FilteredReadAllEventsForward, Message>());
            subscriber.Subscribe(_workersMultiHandler.WidenFrom <ClientMessage.FilteredReadAllEventsBackward, Message>());
            subscriber.Subscribe(_workersMultiHandler.WidenFrom <StorageMessage.BatchLogExpiredMessages, Message>());
            subscriber.Subscribe(_workersMultiHandler.WidenFrom <StorageMessage.EffectiveStreamAclRequest, Message>());
            subscriber.Subscribe(_workersMultiHandler.WidenFrom <StorageMessage.StreamIdFromTransactionIdRequest, Message>());
        }
        public ThreadBasedScheduler(ITimeProvider timeProvider, QueueStatsManager queueStatsManager)
        {
            Ensure.NotNull(timeProvider, "timeProvider");
            _timeProvider = timeProvider;
            _queueStats   = queueStatsManager.CreateQueueStatsCollector("Timer");

            _timerThread = new Thread(DoTiming);
            _timerThread.IsBackground = true;
            _timerThread.Name         = Name;
            _timerThread.Start();
        }
        public StorageWriterService(IPublisher bus,
                                    ISubscriber subscribeToBus,
                                    TimeSpan minFlushDelay,
                                    TFChunkDb db,
                                    TFChunkWriter writer,
                                    IIndexWriter indexWriter,
                                    IEpochManager epochManager,
                                    QueueStatsManager queueStatsManager)
        {
            Ensure.NotNull(bus, "bus");
            Ensure.NotNull(subscribeToBus, "subscribeToBus");
            Ensure.NotNull(db, "db");
            Ensure.NotNull(writer, "writer");
            Ensure.NotNull(indexWriter, "indexWriter");
            Ensure.NotNull(epochManager, "epochManager");

            Bus             = bus;
            _subscribeToBus = subscribeToBus;
            Db           = db;
            _indexWriter = indexWriter;
            EpochManager = epochManager;

            _minFlushDelay      = minFlushDelay.TotalMilliseconds * TicksPerMs;
            _lastFlushDelay     = 0;
            _lastFlushTimestamp = _watch.ElapsedTicks;

            Writer = writer;
            Writer.Open();

            _writerBus         = new InMemoryBus("StorageWriterBus", watchSlowMsg: false);
            StorageWriterQueue = QueuedHandler.CreateQueuedHandler(new AdHocHandler <Message>(CommonHandle),
                                                                   "StorageWriterQueue",
                                                                   queueStatsManager,
                                                                   true,
                                                                   TimeSpan.FromMilliseconds(500));
            _tasks.Add(StorageWriterQueue.Start());

            SubscribeToMessage <SystemMessage.SystemInit>();
            SubscribeToMessage <SystemMessage.StateChangeMessage>();
            SubscribeToMessage <SystemMessage.WriteEpoch>();
            SubscribeToMessage <SystemMessage.WaitForChaserToCatchUp>();
            SubscribeToMessage <StorageMessage.WritePrepares>();
            SubscribeToMessage <StorageMessage.WriteDelete>();
            SubscribeToMessage <StorageMessage.WriteTransactionStart>();
            SubscribeToMessage <StorageMessage.WriteTransactionData>();
            SubscribeToMessage <StorageMessage.WriteTransactionEnd>();
            SubscribeToMessage <StorageMessage.WriteCommit>();
        }
        public ClusterStorageWriterService(IPublisher bus,
                                           ISubscriber subscribeToBus,
                                           TimeSpan minFlushDelay,
                                           TFChunkDb db,
                                           TFChunkWriter writer,
                                           IIndexWriter indexWriter,
                                           IEpochManager epochManager,
                                           QueueStatsManager queueStatsManager,
                                           Func <long> getLastIndexedPosition)
            : base(bus, subscribeToBus, minFlushDelay, db, writer, indexWriter, epochManager, queueStatsManager)
        {
            Ensure.NotNull(getLastIndexedPosition, "getLastCommitPosition");

            _getLastIndexedPosition = getLastIndexedPosition;
            _framer = new LengthPrefixSuffixFramer(OnLogRecordUnframed, TFConsts.MaxLogRecordSize);

            SubscribeToMessage <ReplicationMessage.ReplicaSubscribed>();
            SubscribeToMessage <ReplicationMessage.CreateChunk>();
            SubscribeToMessage <ReplicationMessage.RawChunkBulk>();
            SubscribeToMessage <ReplicationMessage.DataChunkBulk>();
        }
Esempio n. 6
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 public StandardComponents(
     TFChunkDb db,
     IQueuedHandler mainQueue,
     ISubscriber mainBus,
     TimerService timerService,
     ITimeProvider timeProvider,
     IHttpForwarder httpForwarder,
     IHttpService[] httpServices,
     IPublisher networkSendService,
     QueueStatsManager queueStatsManager)
 {
     _db                 = db;
     _mainQueue          = mainQueue;
     _mainBus            = mainBus;
     _timerService       = timerService;
     _timeProvider       = timeProvider;
     _httpForwarder      = httpForwarder;
     _httpServices       = httpServices;
     _networkSendService = networkSendService;
     _queueStatsManager  = queueStatsManager;
 }
Esempio n. 7
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        public IndexCommitterService(
            IIndexCommitter indexCommitter,
            IPublisher publisher,
            ICheckpoint writerCheckpoint,
            ICheckpoint replicationCheckpoint,
            int commitCount,
            ITableIndex tableIndex,
            QueueStatsManager queueStatsManager)
        {
            Ensure.NotNull(indexCommitter, nameof(indexCommitter));
            Ensure.NotNull(publisher, nameof(publisher));
            Ensure.NotNull(writerCheckpoint, nameof(writerCheckpoint));
            Ensure.NotNull(replicationCheckpoint, nameof(replicationCheckpoint));
            Ensure.Positive(commitCount, nameof(commitCount));

            _indexCommitter        = indexCommitter;
            _publisher             = publisher;
            _writerCheckpoint      = writerCheckpoint;
            _replicationCheckpoint = replicationCheckpoint;
            _commitCount           = commitCount;
            _tableIndex            = tableIndex;
            _queueStats            = queueStatsManager.CreateQueueStatsCollector("Index Committer");
        }
Esempio n. 8
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        public StorageChaser(IPublisher leaderBus,
                             IReadOnlyCheckpoint writerCheckpoint,
                             ITransactionFileChaser chaser,
                             IIndexCommitterService indexCommitterService,
                             IEpochManager epochManager,
                             QueueStatsManager queueStatsManager)
        {
            Ensure.NotNull(leaderBus, "leaderBus");
            Ensure.NotNull(writerCheckpoint, "writerCheckpoint");
            Ensure.NotNull(chaser, "chaser");
            Ensure.NotNull(indexCommitterService, "indexCommitterService");
            Ensure.NotNull(epochManager, "epochManager");

            _leaderBus             = leaderBus;
            _writerCheckpoint      = writerCheckpoint;
            _chaser                = chaser;
            _indexCommitterService = indexCommitterService;
            _epochManager          = epochManager;
            _queueStats            = queueStatsManager.CreateQueueStatsCollector("Storage Chaser");

            _flushDelay = 0;
            _lastFlush  = _watch.ElapsedTicks;
        }
Esempio n. 9
0
        public ClusterVNode(TFChunkDb db,
                            ClusterVNodeSettings vNodeSettings,
                            IGossipSeedSource gossipSeedSource,
                            InfoController infoController,
                            params ISubsystem[] subsystems)
        {
            Ensure.NotNull(db, "db");
            Ensure.NotNull(vNodeSettings, "vNodeSettings");
            Ensure.NotNull(gossipSeedSource, "gossipSeedSource");

#if DEBUG
            AddTask(_taskAddedTrigger.Task);
#endif

            var isSingleNode = vNodeSettings.ClusterNodeCount == 1;
            _vNodeSettings      = vNodeSettings;
            _nodeInfo           = vNodeSettings.NodeInfo;
            _certificate        = vNodeSettings.Certificate;
            _mainBus            = new InMemoryBus("MainBus");
            _httpMessageHandler = vNodeSettings.CreateHttpMessageHandler?.Invoke();
            _queueStatsManager  = new QueueStatsManager();

            var forwardingProxy = new MessageForwardingProxy();
            if (vNodeSettings.EnableHistograms)
            {
                HistogramService.CreateHistograms();
                //start watching jitter
                HistogramService.StartJitterMonitor();
            }

            // MISC WORKERS
            _workerBuses = Enumerable.Range(0, vNodeSettings.WorkerThreads).Select(queueNum =>
                                                                                   new InMemoryBus(string.Format("Worker #{0} Bus", queueNum + 1),
                                                                                                   watchSlowMsg: true,
                                                                                                   slowMsgThreshold: TimeSpan.FromMilliseconds(200))).ToArray();
            _workersHandler = new MultiQueuedHandler(
                vNodeSettings.WorkerThreads,
                queueNum => new QueuedHandlerThreadPool(_workerBuses[queueNum],
                                                        string.Format("Worker #{0}", queueNum + 1),
                                                        _queueStatsManager,
                                                        groupName: "Workers",
                                                        watchSlowMsg: true,
                                                        slowMsgThreshold: TimeSpan.FromMilliseconds(200)));

            _subsystems = subsystems;

            _controller = new ClusterVNodeController((IPublisher)_mainBus, _nodeInfo, db, vNodeSettings, this,
                                                     forwardingProxy, _subsystems);
            _mainQueue = QueuedHandler.CreateQueuedHandler(_controller, "MainQueue", _queueStatsManager);

            _controller.SetMainQueue(_mainQueue);

            //SELF
            _mainBus.Subscribe <SystemMessage.StateChangeMessage>(this);
            _mainBus.Subscribe <SystemMessage.BecomeShuttingDown>(this);
            _mainBus.Subscribe <SystemMessage.BecomeShutdown>(this);
            // MONITORING
            var monitoringInnerBus   = new InMemoryBus("MonitoringInnerBus", watchSlowMsg: false);
            var monitoringRequestBus = new InMemoryBus("MonitoringRequestBus", watchSlowMsg: false);
            var monitoringQueue      = new QueuedHandlerThreadPool(monitoringInnerBus, "MonitoringQueue", _queueStatsManager, true,
                                                                   TimeSpan.FromMilliseconds(800));
            var monitoring = new MonitoringService(monitoringQueue,
                                                   monitoringRequestBus,
                                                   _mainQueue,
                                                   db.Config.WriterCheckpoint,
                                                   db.Config.Path,
                                                   vNodeSettings.StatsPeriod,
                                                   _nodeInfo.ExternalHttp,
                                                   vNodeSettings.StatsStorage,
                                                   _nodeInfo.ExternalTcp,
                                                   _nodeInfo.ExternalSecureTcp);
            _mainBus.Subscribe(monitoringQueue.WidenFrom <SystemMessage.SystemInit, Message>());
            _mainBus.Subscribe(monitoringQueue.WidenFrom <SystemMessage.StateChangeMessage, Message>());
            _mainBus.Subscribe(monitoringQueue.WidenFrom <SystemMessage.BecomeShuttingDown, Message>());
            _mainBus.Subscribe(monitoringQueue.WidenFrom <SystemMessage.BecomeShutdown, Message>());
            _mainBus.Subscribe(monitoringQueue.WidenFrom <ClientMessage.WriteEventsCompleted, Message>());
            monitoringInnerBus.Subscribe <SystemMessage.SystemInit>(monitoring);
            monitoringInnerBus.Subscribe <SystemMessage.StateChangeMessage>(monitoring);
            monitoringInnerBus.Subscribe <SystemMessage.BecomeShuttingDown>(monitoring);
            monitoringInnerBus.Subscribe <SystemMessage.BecomeShutdown>(monitoring);
            monitoringInnerBus.Subscribe <ClientMessage.WriteEventsCompleted>(monitoring);
            monitoringInnerBus.Subscribe <MonitoringMessage.GetFreshStats>(monitoring);
            monitoringInnerBus.Subscribe <MonitoringMessage.GetFreshTcpConnectionStats>(monitoring);

            var truncPos         = db.Config.TruncateCheckpoint.Read();
            var writerCheckpoint = db.Config.WriterCheckpoint.Read();
            var chaserCheckpoint = db.Config.ChaserCheckpoint.Read();
            var epochCheckpoint  = db.Config.EpochCheckpoint.Read();
            if (truncPos != -1)
            {
                Log.Info(
                    "Truncate checkpoint is present. Truncate: {truncatePosition} (0x{truncatePosition:X}), Writer: {writerCheckpoint} (0x{writerCheckpoint:X}), Chaser: {chaserCheckpoint} (0x{chaserCheckpoint:X}), Epoch: {epochCheckpoint} (0x{epochCheckpoint:X})",
                    truncPos, truncPos, writerCheckpoint, writerCheckpoint, chaserCheckpoint, chaserCheckpoint,
                    epochCheckpoint, epochCheckpoint);
                var truncator = new TFChunkDbTruncator(db.Config);
                truncator.TruncateDb(truncPos);
            }

            // STORAGE SUBSYSTEM
            db.Open(vNodeSettings.VerifyDbHash, threads: vNodeSettings.InitializationThreads);
            var indexPath  = vNodeSettings.Index ?? Path.Combine(db.Config.Path, "index");
            var readerPool = new ObjectPool <ITransactionFileReader>(
                "ReadIndex readers pool", ESConsts.PTableInitialReaderCount, vNodeSettings.PTableMaxReaderCount,
                () => new TFChunkReader(db, db.Config.WriterCheckpoint,
                                        optimizeReadSideCache: db.Config.OptimizeReadSideCache));
            var tableIndex = new TableIndex(indexPath,
                                            new XXHashUnsafe(),
                                            new Murmur3AUnsafe(),
                                            () => new HashListMemTable(vNodeSettings.IndexBitnessVersion,
                                                                       maxSize: vNodeSettings.MaxMemtableEntryCount * 2),
                                            () => new TFReaderLease(readerPool),
                                            vNodeSettings.IndexBitnessVersion,
                                            maxSizeForMemory: vNodeSettings.MaxMemtableEntryCount,
                                            maxTablesPerLevel: 2,
                                            inMem: db.Config.InMemDb,
                                            skipIndexVerify: vNodeSettings.SkipIndexVerify,
                                            indexCacheDepth: vNodeSettings.IndexCacheDepth,
                                            initializationThreads: vNodeSettings.InitializationThreads,
                                            additionalReclaim: false,
                                            maxAutoMergeIndexLevel: vNodeSettings.MaxAutoMergeIndexLevel,
                                            pTableMaxReaderCount: vNodeSettings.PTableMaxReaderCount);
            var readIndex = new ReadIndex(_mainQueue,
                                          readerPool,
                                          tableIndex,
                                          ESConsts.StreamInfoCacheCapacity,
                                          Application.IsDefined(Application.AdditionalCommitChecks),
                                          Application.IsDefined(Application.InfiniteMetastreams) ? int.MaxValue : 1,
                                          vNodeSettings.HashCollisionReadLimit,
                                          vNodeSettings.SkipIndexScanOnReads,
                                          db.Config.ReplicationCheckpoint);
            _readIndex = readIndex;
            var writer       = new TFChunkWriter(db);
            var epochManager = new EpochManager(_mainQueue,
                                                ESConsts.CachedEpochCount,
                                                db.Config.EpochCheckpoint,
                                                writer,
                                                initialReaderCount: 1,
                                                maxReaderCount: 5,
                                                readerFactory: () => new TFChunkReader(db, db.Config.WriterCheckpoint,
                                                                                       optimizeReadSideCache: db.Config.OptimizeReadSideCache));
            epochManager.Init();

            var storageWriter = new ClusterStorageWriterService(_mainQueue, _mainBus, vNodeSettings.MinFlushDelay,
                                                                db, writer, readIndex.IndexWriter, epochManager, _queueStatsManager,
                                                                () => readIndex.LastIndexedPosition); // subscribes internally
            AddTasks(storageWriter.Tasks);

            monitoringRequestBus.Subscribe <MonitoringMessage.InternalStatsRequest>(storageWriter);

            var storageReader = new StorageReaderService(_mainQueue, _mainBus, readIndex,
                                                         vNodeSettings.ReaderThreadsCount, db.Config.WriterCheckpoint, _queueStatsManager);
            _mainBus.Subscribe <SystemMessage.SystemInit>(storageReader);
            _mainBus.Subscribe <SystemMessage.BecomeShuttingDown>(storageReader);
            _mainBus.Subscribe <SystemMessage.BecomeShutdown>(storageReader);
            monitoringRequestBus.Subscribe <MonitoringMessage.InternalStatsRequest>(storageReader);


            //REPLICATION TRACKING
            var replicationTracker =
                new ReplicationTrackingService(_mainQueue, vNodeSettings.ClusterNodeCount, db.Config.ReplicationCheckpoint, db.Config.WriterCheckpoint);
            AddTask(replicationTracker.Task);
            _mainBus.Subscribe <SystemMessage.SystemInit>(replicationTracker);
            _mainBus.Subscribe <SystemMessage.StateChangeMessage>(replicationTracker);
            _mainBus.Subscribe <SystemMessage.BecomeShuttingDown>(replicationTracker);
            _mainBus.Subscribe <ReplicationTrackingMessage.ReplicaWriteAck>(replicationTracker);
            _mainBus.Subscribe <ReplicationTrackingMessage.WriterCheckpointFlushed>(replicationTracker);
            _mainBus.Subscribe <ReplicationTrackingMessage.MasterReplicatedTo>(replicationTracker);

            var indexCommitterService = new IndexCommitterService(readIndex.IndexCommitter, _mainQueue,
                                                                  db.Config.WriterCheckpoint, db.Config.ReplicationCheckpoint, vNodeSettings.CommitAckCount, tableIndex, _queueStatsManager);
            AddTask(indexCommitterService.Task);

            _mainBus.Subscribe <SystemMessage.BecomeShuttingDown>(indexCommitterService);
            _mainBus.Subscribe <ReplicationTrackingMessage.ReplicatedTo>(indexCommitterService);
            _mainBus.Subscribe <StorageMessage.CommitAck>(indexCommitterService);
            _mainBus.Subscribe <ClientMessage.MergeIndexes>(indexCommitterService);

            var chaser = new TFChunkChaser(db, db.Config.WriterCheckpoint, db.Config.ChaserCheckpoint,
                                           db.Config.OptimizeReadSideCache);
            var storageChaser = new StorageChaser(_mainQueue, db.Config.WriterCheckpoint, chaser, indexCommitterService,
                                                  epochManager, _queueStatsManager);
            AddTask(storageChaser.Task);

#if DEBUG
            _queueStatsManager.InitializeCheckpoints(db.Config.WriterCheckpoint, db.Config.ChaserCheckpoint);
#endif
            _mainBus.Subscribe <SystemMessage.SystemInit>(storageChaser);
            _mainBus.Subscribe <SystemMessage.SystemStart>(storageChaser);
            _mainBus.Subscribe <SystemMessage.BecomeShuttingDown>(storageChaser);

            // AUTHENTICATION INFRASTRUCTURE - delegate to plugins
            _internalAuthenticationProvider =
                vNodeSettings.AuthenticationProviderFactory.BuildAuthenticationProvider(_mainQueue, _mainBus,
                                                                                        _workersHandler, _workerBuses, vNodeSettings.LogFailedAuthenticationAttempts);

            Ensure.NotNull(_internalAuthenticationProvider, "authenticationProvider");

            {
                // EXTERNAL TCP
                if (!vNodeSettings.DisableInsecureTCP)
                {
                    var extTcpService = new TcpService(_mainQueue, _nodeInfo.ExternalTcp, _workersHandler,
                                                       TcpServiceType.External, TcpSecurityType.Normal, new ClientTcpDispatcher(),
                                                       vNodeSettings.ExtTcpHeartbeatInterval, vNodeSettings.ExtTcpHeartbeatTimeout,
                                                       _internalAuthenticationProvider, null, vNodeSettings.ConnectionPendingSendBytesThreshold,
                                                       vNodeSettings.ConnectionQueueSizeThreshold);
                    _mainBus.Subscribe <SystemMessage.SystemInit>(extTcpService);
                    _mainBus.Subscribe <SystemMessage.SystemStart>(extTcpService);
                    _mainBus.Subscribe <SystemMessage.BecomeShuttingDown>(extTcpService);
                }

                // EXTERNAL SECURE TCP
                if (_nodeInfo.ExternalSecureTcp != null)
                {
                    var extSecTcpService = new TcpService(_mainQueue, _nodeInfo.ExternalSecureTcp, _workersHandler,
                                                          TcpServiceType.External, TcpSecurityType.Secure, new ClientTcpDispatcher(),
                                                          vNodeSettings.ExtTcpHeartbeatInterval, vNodeSettings.ExtTcpHeartbeatTimeout,
                                                          _internalAuthenticationProvider, vNodeSettings.Certificate,
                                                          vNodeSettings.ConnectionPendingSendBytesThreshold, vNodeSettings.ConnectionQueueSizeThreshold);
                    _mainBus.Subscribe <SystemMessage.SystemInit>(extSecTcpService);
                    _mainBus.Subscribe <SystemMessage.SystemStart>(extSecTcpService);
                    _mainBus.Subscribe <SystemMessage.BecomeShuttingDown>(extSecTcpService);
                }

                if (!isSingleNode)
                {
                    // INTERNAL TCP
                    if (!vNodeSettings.DisableInsecureTCP)
                    {
                        var intTcpService = new TcpService(_mainQueue, _nodeInfo.InternalTcp, _workersHandler,
                                                           TcpServiceType.Internal, TcpSecurityType.Normal,
                                                           new InternalTcpDispatcher(),
                                                           vNodeSettings.IntTcpHeartbeatInterval, vNodeSettings.IntTcpHeartbeatTimeout,
                                                           _internalAuthenticationProvider, null, ESConsts.UnrestrictedPendingSendBytes,
                                                           ESConsts.MaxConnectionQueueSize);
                        _mainBus.Subscribe <SystemMessage.SystemInit>(intTcpService);
                        _mainBus.Subscribe <SystemMessage.SystemStart>(intTcpService);
                        _mainBus.Subscribe <SystemMessage.BecomeShuttingDown>(intTcpService);
                    }

                    // INTERNAL SECURE TCP
                    if (_nodeInfo.InternalSecureTcp != null)
                    {
                        var intSecTcpService = new TcpService(_mainQueue, _nodeInfo.InternalSecureTcp, _workersHandler,
                                                              TcpServiceType.Internal, TcpSecurityType.Secure,
                                                              new InternalTcpDispatcher(),
                                                              vNodeSettings.IntTcpHeartbeatInterval, vNodeSettings.IntTcpHeartbeatTimeout,
                                                              _internalAuthenticationProvider, vNodeSettings.Certificate,
                                                              ESConsts.UnrestrictedPendingSendBytes,
                                                              ESConsts.MaxConnectionQueueSize);
                        _mainBus.Subscribe <SystemMessage.SystemInit>(intSecTcpService);
                        _mainBus.Subscribe <SystemMessage.SystemStart>(intSecTcpService);
                        _mainBus.Subscribe <SystemMessage.BecomeShuttingDown>(intSecTcpService);
                    }
                }
            }

            SubscribeWorkers(bus => {
                var tcpSendService = new TcpSendService();
                // ReSharper disable RedundantTypeArgumentsOfMethod
                bus.Subscribe <TcpMessage.TcpSend>(tcpSendService);
                // ReSharper restore RedundantTypeArgumentsOfMethod
            });

            var httpAuthenticationProviders = new List <HttpAuthenticationProvider> {
                new BasicHttpAuthenticationProvider(_internalAuthenticationProvider),
            };
            if (vNodeSettings.EnableTrustedAuth)
            {
                httpAuthenticationProviders.Add(new TrustedHttpAuthenticationProvider());
            }
            httpAuthenticationProviders.Add(new AnonymousHttpAuthenticationProvider());

            var httpPipe        = new HttpMessagePipe();
            var httpSendService = new HttpSendService(httpPipe, forwardRequests: true);
            _mainBus.Subscribe <SystemMessage.StateChangeMessage>(httpSendService);
            _mainBus.Subscribe(new WideningHandler <HttpMessage.SendOverHttp, Message>(_workersHandler));
            SubscribeWorkers(bus => {
                bus.Subscribe <HttpMessage.HttpSend>(httpSendService);
                bus.Subscribe <HttpMessage.HttpSendPart>(httpSendService);
                bus.Subscribe <HttpMessage.HttpBeginSend>(httpSendService);
                bus.Subscribe <HttpMessage.HttpEndSend>(httpSendService);
                bus.Subscribe <HttpMessage.SendOverHttp>(httpSendService);
            });

            _mainBus.Subscribe <SystemMessage.StateChangeMessage>(infoController);

            var adminController     = new AdminController(_mainQueue, _workersHandler);
            var pingController      = new PingController();
            var histogramController = new HistogramController();
            var statController      = new StatController(monitoringQueue, _workersHandler);
            var atomController      = new AtomController(httpSendService, _mainQueue, _workersHandler,
                                                         vNodeSettings.DisableHTTPCaching);
            var gossipController = new GossipController(_mainQueue, _workersHandler, vNodeSettings.GossipTimeout,
                                                        _httpMessageHandler);
            var persistentSubscriptionController =
                new PersistentSubscriptionController(httpSendService, _mainQueue, _workersHandler);
            var electController = new ElectController(_mainQueue, _httpMessageHandler);

            // HTTP SENDERS
            gossipController.SubscribeSenders(httpPipe);
            electController.SubscribeSenders(httpPipe);

            // EXTERNAL HTTP
            _externalHttpService = new KestrelHttpService(ServiceAccessibility.Public, _mainQueue, new TrieUriRouter(),
                                                          _workersHandler, vNodeSettings.LogHttpRequests,
                                                          vNodeSettings.GossipAdvertiseInfo.AdvertiseExternalIPAs,
                                                          vNodeSettings.GossipAdvertiseInfo.AdvertiseExternalHttpPortAs,
                                                          vNodeSettings.DisableFirstLevelHttpAuthorization,
                                                          vNodeSettings.NodeInfo.ExternalHttp);
            _externalHttpService.SetupController(persistentSubscriptionController);
            if (vNodeSettings.AdminOnPublic)
            {
                _externalHttpService.SetupController(adminController);
            }
            _externalHttpService.SetupController(pingController);
            _externalHttpService.SetupController(infoController);
            if (vNodeSettings.StatsOnPublic)
            {
                _externalHttpService.SetupController(statController);
            }
            _externalHttpService.SetupController(atomController);
            if (vNodeSettings.GossipOnPublic)
            {
                _externalHttpService.SetupController(gossipController);
            }
            _externalHttpService.SetupController(histogramController);

            _mainBus.Subscribe <SystemMessage.SystemInit>(_externalHttpService);
            _mainBus.Subscribe <SystemMessage.BecomeShuttingDown>(_externalHttpService);
            _mainBus.Subscribe <HttpMessage.PurgeTimedOutRequests>(_externalHttpService);
            // INTERNAL HTTP
            if (!isSingleNode)
            {
                _internalHttpService = new KestrelHttpService(ServiceAccessibility.Private, _mainQueue,
                                                              new TrieUriRouter(),
                                                              _workersHandler, vNodeSettings.LogHttpRequests,
                                                              vNodeSettings.GossipAdvertiseInfo.AdvertiseInternalIPAs,
                                                              vNodeSettings.GossipAdvertiseInfo.AdvertiseInternalHttpPortAs,
                                                              vNodeSettings.DisableFirstLevelHttpAuthorization,
                                                              vNodeSettings.NodeInfo.InternalHttp);
                _internalHttpService.SetupController(adminController);
                _internalHttpService.SetupController(pingController);
                _internalHttpService.SetupController(infoController);
                _internalHttpService.SetupController(statController);
                _internalHttpService.SetupController(atomController);
                _internalHttpService.SetupController(gossipController);
                _internalHttpService.SetupController(electController);
                _internalHttpService.SetupController(histogramController);
                _internalHttpService.SetupController(persistentSubscriptionController);
            }

            // Authentication plugin HTTP
            vNodeSettings.AuthenticationProviderFactory.RegisterHttpControllers(_externalHttpService,
                                                                                _internalHttpService, httpSendService, _mainQueue, _workersHandler);
            if (_internalHttpService != null)
            {
                _mainBus.Subscribe <SystemMessage.SystemInit>(_internalHttpService);
                _mainBus.Subscribe <SystemMessage.BecomeShuttingDown>(_internalHttpService);
                _mainBus.Subscribe <HttpMessage.PurgeTimedOutRequests>(_internalHttpService);
            }

            SubscribeWorkers(bus => {
                KestrelHttpService.CreateAndSubscribePipeline(bus, httpAuthenticationProviders.ToArray());
            });

            // REQUEST FORWARDING
            var forwardingService = new RequestForwardingService(_mainQueue, forwardingProxy, TimeSpan.FromSeconds(1));
            _mainBus.Subscribe <SystemMessage.SystemStart>(forwardingService);
            _mainBus.Subscribe <SystemMessage.RequestForwardingTimerTick>(forwardingService);
            _mainBus.Subscribe <ClientMessage.NotHandled>(forwardingService);
            _mainBus.Subscribe <ClientMessage.WriteEventsCompleted>(forwardingService);
            _mainBus.Subscribe <ClientMessage.TransactionStartCompleted>(forwardingService);
            _mainBus.Subscribe <ClientMessage.TransactionWriteCompleted>(forwardingService);
            _mainBus.Subscribe <ClientMessage.TransactionCommitCompleted>(forwardingService);
            _mainBus.Subscribe <ClientMessage.DeleteStreamCompleted>(forwardingService);

            // REQUEST MANAGEMENT
            var requestManagement = new RequestManagementService(
                _mainQueue,
                vNodeSettings.PrepareTimeout,
                vNodeSettings.CommitTimeout,
                vNodeSettings.BetterOrdering);

            _mainBus.Subscribe <SystemMessage.SystemInit>(requestManagement);
            _mainBus.Subscribe <SystemMessage.StateChangeMessage>(requestManagement);

            _mainBus.Subscribe <ClientMessage.WriteEvents>(requestManagement);
            _mainBus.Subscribe <ClientMessage.TransactionStart>(requestManagement);
            _mainBus.Subscribe <ClientMessage.TransactionWrite>(requestManagement);
            _mainBus.Subscribe <ClientMessage.TransactionCommit>(requestManagement);
            _mainBus.Subscribe <ClientMessage.DeleteStream>(requestManagement);

            _mainBus.Subscribe <StorageMessage.CheckStreamAccessCompleted>(requestManagement);
            _mainBus.Subscribe <StorageMessage.AlreadyCommitted>(requestManagement);

            _mainBus.Subscribe <StorageMessage.CommitAck>(requestManagement);
            _mainBus.Subscribe <StorageMessage.PrepareAck>(requestManagement);
            _mainBus.Subscribe <ReplicationTrackingMessage.ReplicatedTo>(requestManagement);
            _mainBus.Subscribe <ReplicationTrackingMessage.IndexedTo>(requestManagement);
            _mainBus.Subscribe <StorageMessage.RequestCompleted>(requestManagement);
            _mainBus.Subscribe <StorageMessage.CommitIndexed>(requestManagement);

            _mainBus.Subscribe <StorageMessage.WrongExpectedVersion>(requestManagement);
            _mainBus.Subscribe <StorageMessage.InvalidTransaction>(requestManagement);
            _mainBus.Subscribe <StorageMessage.StreamDeleted>(requestManagement);

            _mainBus.Subscribe <StorageMessage.RequestManagerTimerTick>(requestManagement);

            // SUBSCRIPTIONS
            var subscrBus   = new InMemoryBus("SubscriptionsBus", true, TimeSpan.FromMilliseconds(50));
            var subscrQueue = new QueuedHandlerThreadPool(subscrBus, "Subscriptions", _queueStatsManager, false);
            _mainBus.Subscribe(subscrQueue.WidenFrom <SystemMessage.SystemStart, Message>());
            _mainBus.Subscribe(subscrQueue.WidenFrom <SystemMessage.BecomeShuttingDown, Message>());
            _mainBus.Subscribe(subscrQueue.WidenFrom <TcpMessage.ConnectionClosed, Message>());
            _mainBus.Subscribe(subscrQueue.WidenFrom <ClientMessage.SubscribeToStream, Message>());
            _mainBus.Subscribe(subscrQueue.WidenFrom <ClientMessage.FilteredSubscribeToStream, Message>());
            _mainBus.Subscribe(subscrQueue.WidenFrom <ClientMessage.UnsubscribeFromStream, Message>());
            _mainBus.Subscribe(subscrQueue.WidenFrom <SubscriptionMessage.PollStream, Message>());
            _mainBus.Subscribe(subscrQueue.WidenFrom <SubscriptionMessage.CheckPollTimeout, Message>());
            _mainBus.Subscribe(subscrQueue.WidenFrom <StorageMessage.EventCommitted, Message>());

            var subscription = new SubscriptionsService(_mainQueue, subscrQueue, readIndex);
            subscrBus.Subscribe <SystemMessage.SystemStart>(subscription);
            subscrBus.Subscribe <SystemMessage.BecomeShuttingDown>(subscription);
            subscrBus.Subscribe <TcpMessage.ConnectionClosed>(subscription);
            subscrBus.Subscribe <ClientMessage.SubscribeToStream>(subscription);
            subscrBus.Subscribe <ClientMessage.FilteredSubscribeToStream>(subscription);
            subscrBus.Subscribe <ClientMessage.UnsubscribeFromStream>(subscription);
            subscrBus.Subscribe <SubscriptionMessage.PollStream>(subscription);
            subscrBus.Subscribe <SubscriptionMessage.CheckPollTimeout>(subscription);
            subscrBus.Subscribe <StorageMessage.EventCommitted>(subscription);

            // PERSISTENT SUBSCRIPTIONS
            // IO DISPATCHER
            var ioDispatcher = new IODispatcher(_mainQueue, new PublishEnvelope(_mainQueue));
            _mainBus.Subscribe <ClientMessage.ReadStreamEventsBackwardCompleted>(ioDispatcher.BackwardReader);
            _mainBus.Subscribe <ClientMessage.WriteEventsCompleted>(ioDispatcher.Writer);
            _mainBus.Subscribe <ClientMessage.ReadStreamEventsForwardCompleted>(ioDispatcher.ForwardReader);
            _mainBus.Subscribe <ClientMessage.DeleteStreamCompleted>(ioDispatcher.StreamDeleter);
            _mainBus.Subscribe(ioDispatcher);
            var perSubscrBus   = new InMemoryBus("PersistentSubscriptionsBus", true, TimeSpan.FromMilliseconds(50));
            var perSubscrQueue = new QueuedHandlerThreadPool(perSubscrBus, "PersistentSubscriptions", _queueStatsManager, false);
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <SystemMessage.StateChangeMessage, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <TcpMessage.ConnectionClosed, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <ClientMessage.CreatePersistentSubscription, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <ClientMessage.UpdatePersistentSubscription, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <ClientMessage.DeletePersistentSubscription, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <ClientMessage.ConnectToPersistentSubscription, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <ClientMessage.UnsubscribeFromStream, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <ClientMessage.PersistentSubscriptionAckEvents, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <ClientMessage.PersistentSubscriptionNackEvents, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <ClientMessage.ReplayAllParkedMessages, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <ClientMessage.ReplayParkedMessage, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <ClientMessage.ReadNextNPersistentMessages, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <StorageMessage.EventCommitted, Message>());
            _mainBus.Subscribe(perSubscrQueue
                               .WidenFrom <MonitoringMessage.GetAllPersistentSubscriptionStats, Message>());
            _mainBus.Subscribe(
                perSubscrQueue.WidenFrom <MonitoringMessage.GetStreamPersistentSubscriptionStats, Message>());
            _mainBus.Subscribe(perSubscrQueue.WidenFrom <MonitoringMessage.GetPersistentSubscriptionStats, Message>());
            _mainBus.Subscribe(perSubscrQueue
                               .WidenFrom <SubscriptionMessage.PersistentSubscriptionTimerTick, Message>());

            //TODO CC can have multiple threads working on subscription if partition
            var consumerStrategyRegistry =
                new PersistentSubscriptionConsumerStrategyRegistry(_mainQueue, _mainBus,
                                                                   vNodeSettings.AdditionalConsumerStrategies);
            var persistentSubscription = new PersistentSubscriptionService(perSubscrQueue, readIndex, ioDispatcher,
                                                                           _mainQueue, consumerStrategyRegistry);
            perSubscrBus.Subscribe <SystemMessage.BecomeShuttingDown>(persistentSubscription);
            perSubscrBus.Subscribe <SystemMessage.BecomeMaster>(persistentSubscription);
            perSubscrBus.Subscribe <SystemMessage.StateChangeMessage>(persistentSubscription);
            perSubscrBus.Subscribe <TcpMessage.ConnectionClosed>(persistentSubscription);
            perSubscrBus.Subscribe <ClientMessage.ConnectToPersistentSubscription>(persistentSubscription);
            perSubscrBus.Subscribe <ClientMessage.UnsubscribeFromStream>(persistentSubscription);
            perSubscrBus.Subscribe <ClientMessage.PersistentSubscriptionAckEvents>(persistentSubscription);
            perSubscrBus.Subscribe <ClientMessage.PersistentSubscriptionNackEvents>(persistentSubscription);
            perSubscrBus.Subscribe <StorageMessage.EventCommitted>(persistentSubscription);
            perSubscrBus.Subscribe <ClientMessage.DeletePersistentSubscription>(persistentSubscription);
            perSubscrBus.Subscribe <ClientMessage.CreatePersistentSubscription>(persistentSubscription);
            perSubscrBus.Subscribe <ClientMessage.UpdatePersistentSubscription>(persistentSubscription);
            perSubscrBus.Subscribe <ClientMessage.ReplayAllParkedMessages>(persistentSubscription);
            perSubscrBus.Subscribe <ClientMessage.ReplayParkedMessage>(persistentSubscription);
            perSubscrBus.Subscribe <ClientMessage.ReadNextNPersistentMessages>(persistentSubscription);
            perSubscrBus.Subscribe <MonitoringMessage.GetAllPersistentSubscriptionStats>(persistentSubscription);
            perSubscrBus.Subscribe <MonitoringMessage.GetStreamPersistentSubscriptionStats>(persistentSubscription);
            perSubscrBus.Subscribe <MonitoringMessage.GetPersistentSubscriptionStats>(persistentSubscription);
            perSubscrBus.Subscribe <SubscriptionMessage.PersistentSubscriptionTimerTick>(persistentSubscription);

            // STORAGE SCAVENGER
            var scavengerLogManager = new TFChunkScavengerLogManager(_nodeInfo.ExternalHttp.ToString(),
                                                                     TimeSpan.FromDays(vNodeSettings.ScavengeHistoryMaxAge), ioDispatcher);
            var storageScavenger = new StorageScavenger(db,
                                                        tableIndex,
                                                        readIndex,
                                                        scavengerLogManager,
                                                        vNodeSettings.AlwaysKeepScavenged,
                                                        !vNodeSettings.DisableScavengeMerging,
                                                        unsafeIgnoreHardDeletes: vNodeSettings.UnsafeIgnoreHardDeletes);

            // ReSharper disable RedundantTypeArgumentsOfMethod
            _mainBus.Subscribe <ClientMessage.ScavengeDatabase>(storageScavenger);
            _mainBus.Subscribe <ClientMessage.StopDatabaseScavenge>(storageScavenger);
            _mainBus.Subscribe <SystemMessage.StateChangeMessage>(storageScavenger);
            // ReSharper restore RedundantTypeArgumentsOfMethod


            // TIMER
            _timeProvider = new RealTimeProvider();
            var threadBasedScheduler = new ThreadBasedScheduler(_timeProvider, _queueStatsManager);
            AddTask(threadBasedScheduler.Task);
            _timerService = new TimerService(threadBasedScheduler);
            _mainBus.Subscribe <SystemMessage.BecomeShutdown>(_timerService);
            _mainBus.Subscribe <TimerMessage.Schedule>(_timerService);

            var gossipInfo = new VNodeInfo(_nodeInfo.InstanceId, _nodeInfo.DebugIndex,
                                           vNodeSettings.GossipAdvertiseInfo.InternalTcp,
                                           vNodeSettings.GossipAdvertiseInfo.InternalSecureTcp,
                                           vNodeSettings.GossipAdvertiseInfo.ExternalTcp,
                                           vNodeSettings.GossipAdvertiseInfo.ExternalSecureTcp,
                                           vNodeSettings.GossipAdvertiseInfo.InternalHttp,
                                           vNodeSettings.GossipAdvertiseInfo.ExternalHttp,
                                           vNodeSettings.ReadOnlyReplica);
            if (!isSingleNode)
            {
                // MASTER REPLICATION
                var masterReplicationService = new MasterReplicationService(_mainQueue, gossipInfo.InstanceId, db,
                                                                            _workersHandler,
                                                                            epochManager, vNodeSettings.ClusterNodeCount,
                                                                            vNodeSettings.UnsafeAllowSurplusNodes,
                                                                            _queueStatsManager);
                AddTask(masterReplicationService.Task);
                _mainBus.Subscribe <SystemMessage.SystemStart>(masterReplicationService);
                _mainBus.Subscribe <SystemMessage.StateChangeMessage>(masterReplicationService);
                _mainBus.Subscribe <ReplicationMessage.ReplicaSubscriptionRequest>(masterReplicationService);
                _mainBus.Subscribe <ReplicationMessage.ReplicaLogPositionAck>(masterReplicationService);
                _mainBus.Subscribe <ReplicationTrackingMessage.ReplicatedTo>(masterReplicationService);
                monitoringInnerBus.Subscribe <ReplicationMessage.GetReplicationStats>(masterReplicationService);

                // REPLICA REPLICATION
                var replicaService = new ReplicaService(_mainQueue, db, epochManager, _workersHandler,
                                                        _internalAuthenticationProvider,
                                                        gossipInfo, vNodeSettings.UseSsl, vNodeSettings.SslTargetHost, vNodeSettings.SslValidateServer,
                                                        vNodeSettings.IntTcpHeartbeatTimeout, vNodeSettings.ExtTcpHeartbeatInterval);
                _mainBus.Subscribe <SystemMessage.StateChangeMessage>(replicaService);
                _mainBus.Subscribe <ReplicationMessage.ReconnectToMaster>(replicaService);
                _mainBus.Subscribe <ReplicationMessage.SubscribeToMaster>(replicaService);
                _mainBus.Subscribe <ReplicationMessage.AckLogPosition>(replicaService);
                _mainBus.Subscribe <ClientMessage.TcpForwardMessage>(replicaService);
            }

            // ELECTIONS

            var electionsService = new ElectionsService(_mainQueue, gossipInfo, vNodeSettings.ClusterNodeCount,
                                                        db.Config.WriterCheckpoint, db.Config.ChaserCheckpoint,
                                                        epochManager, () => readIndex.LastIndexedPosition, vNodeSettings.NodePriority, _timeProvider);
            electionsService.SubscribeMessages(_mainBus);
            if (!isSingleNode || vNodeSettings.GossipOnSingleNode)
            {
                // GOSSIP

                var gossip = new NodeGossipService(_mainQueue, gossipSeedSource, gossipInfo, db.Config.WriterCheckpoint,
                                                   db.Config.ChaserCheckpoint, epochManager, () => readIndex.LastIndexedPosition,
                                                   vNodeSettings.NodePriority, vNodeSettings.GossipInterval,
                                                   vNodeSettings.GossipAllowedTimeDifference,
                                                   _timeProvider);
                _mainBus.Subscribe <SystemMessage.SystemInit>(gossip);
                _mainBus.Subscribe <GossipMessage.RetrieveGossipSeedSources>(gossip);
                _mainBus.Subscribe <GossipMessage.GotGossipSeedSources>(gossip);
                _mainBus.Subscribe <GossipMessage.Gossip>(gossip);
                _mainBus.Subscribe <GossipMessage.GossipReceived>(gossip);
                _mainBus.Subscribe <SystemMessage.StateChangeMessage>(gossip);
                _mainBus.Subscribe <GossipMessage.GossipSendFailed>(gossip);
                _mainBus.Subscribe <GossipMessage.UpdateNodePriority>(gossip);
                _mainBus.Subscribe <SystemMessage.VNodeConnectionEstablished>(gossip);
                _mainBus.Subscribe <SystemMessage.VNodeConnectionLost>(gossip);
                _mainBus.Subscribe <GossipMessage.GetGossipFailed>(gossip);
                _mainBus.Subscribe <GossipMessage.GetGossipReceived>(gossip);
                _mainBus.Subscribe <ElectionMessage.ElectionsDone>(gossip);
            }

            _startup = new ClusterVNodeStartup(_subsystems, _mainQueue, _internalAuthenticationProvider, _readIndex,
                                               _vNodeSettings, _externalHttpService, _internalHttpService);

            _mainBus.Subscribe <SystemMessage.SystemReady>(_startup);
            _mainBus.Subscribe <SystemMessage.BecomeShuttingDown>(_startup);

            // kestrel
            AddTasks(_workersHandler.Start());
            AddTask(_mainQueue.Start());
            AddTask(monitoringQueue.Start());
            AddTask(subscrQueue.Start());
            AddTask(perSubscrQueue.Start());

            if (subsystems != null)
            {
                foreach (var subsystem in subsystems)
                {
                    var http = isSingleNode
                                                ? new[] { _externalHttpService }
                                                : new[] { _internalHttpService, _externalHttpService };
                    subsystem.Register(new StandardComponents(db, _mainQueue, _mainBus, _timerService, _timeProvider,
                                                              httpSendService, http, _workersHandler, _queueStatsManager));
                }
            }
        }