public ProgressWorkItem(ICoreProjectionCheckpointManager checkpointManager, IProgressResultWriter resultWriter, float progress)
     : base(null) 
 {
     _checkpointManager = checkpointManager;
     _resultWriter = resultWriter;
     _progress = progress;
 }
 protected EventSubscriptionBasedProjectionProcessingPhase(
     IPublisher publisher,
     IPublisher inputQueue,
     ICoreProjectionForProcessingPhase coreProjection,
     Guid projectionCorrelationId,
     ICoreProjectionCheckpointManager checkpointManager,
     ProjectionConfig projectionConfig,
     string projectionName,
     ILogger logger,
     CheckpointTag zeroCheckpointTag,
     PartitionStateCache partitionStateCache,
     IResultWriter resultWriter,
     Action updateStatistics,
     ReaderSubscriptionDispatcher subscriptionDispatcher,
     IReaderStrategy readerStrategy,
     bool useCheckpoints,
     bool stopOnEof,
     bool orderedPartitionProcessing,
     bool isBiState,
     IEmittedStreamsTracker emittedStreamsTracker)
 {
     _publisher               = publisher;
     _inputQueue              = inputQueue;
     _coreProjection          = coreProjection;
     _projectionCorrelationId = projectionCorrelationId;
     _checkpointManager       = checkpointManager;
     _projectionConfig        = projectionConfig;
     _projectionName          = projectionName;
     _logger              = logger;
     _zeroCheckpointTag   = zeroCheckpointTag;
     _partitionStateCache = partitionStateCache;
     _resultWriter        = resultWriter;
     _updateStatistics    = updateStatistics;
     _processingQueue     = new CoreProjectionQueue(publisher,
                                                    projectionConfig.PendingEventsThreshold,
                                                    orderedPartitionProcessing);
     _processingQueue.EnsureTickPending += EnsureTickPending;
     _subscriptionDispatcher             = subscriptionDispatcher;
     _readerStrategy        = readerStrategy;
     _useCheckpoints        = useCheckpoints;
     _stopOnEof             = stopOnEof;
     _isBiState             = isBiState;
     _progressResultWriter  = new ProgressResultWriter(this, _resultWriter);
     _inutQueueEnvelope     = new PublishEnvelope(_inputQueue);
     _emittedStreamsTracker = emittedStreamsTracker;
 }