class SyncController {

  public long subscribeToSyncChanges(final SyncSubscriber subscriber) {
    return subscribers.subscribe(subscriber);
  }

  public  SyncController(
      final EventThread eventThread,
      final Executor subscriberExecutor,
      final RecentChainData recentChainData,
      final ChainSelector finalizedTargetChainSelector,
      final ChainSelector nonfinalizedTargetChainSelector,
      final Sync sync);

}