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@PublicEvolving
public abstract class SplitFetcherManager<E, SplitT extends SourceSplit> {        
	@Deprecated
    public SplitFetcherManager(
            FutureCompletingBlockingQueue<RecordsWithSplitIds<E>> elementsQueue,
            Supplier<SplitReader<E, SplitT>> splitReaderFactory,
            Configuration configuration) {
        this(elementsQueue, splitReaderFactory, configuration, (ignore) -> {
        });
    }       

    @Deprecated
    @VisibleForTesting
    public SplitFetcherManager(
            FutureCompletingBlockingQueue<RecordsWithSplitIds<E>> elementsQueue,
            Supplier<SplitReader<E, SplitT>> splitReaderFactory,
            Configuration configuration,
            Consumer<Collection<String>> splitFinishedHook) {

	}



 // todo: provide a new constructor without FutureCompletingBlockingQueue.     
 public SplitFetcherManager(
            Supplier<SplitReader<E, SplitT>> splitReaderFactory,
            Configuration configuration) {
        this(splitReaderFactory, configuration, (ignore) -> {
        });
        
  }

  // todo: provide a new constructor without FutureCompletingBlockingQueue.
  public SplitFetcherManager(
            Supplier<SplitReader<E, SplitT>> splitReaderFactory,
            Configuration configuration,
            Consumer<Collection<String>> splitFinishedHook) {
        this.elementsQueue = new FutureCompletingBlockingQueue<>(
                configuration.getInteger(SourceReaderOptions.ELEMENT_QUEUE_CAPACITY));
		// ......
	}

	
	@Internal
	public SplitFetcherManager#getQueueFutureCompletingBlockingQueue getQueue();
 }