void handleAllCompleted() {
    CombinedFutureInterruptibleTask<?> localTask = task;
    if (localTask != null) {
      localTask.execute();
    }
  }

  @Override
  void releaseResources(ReleaseResourcesReason reason) {
    super.releaseResources(reason);
    /*
     * If the output future is done, then it won't need to interrupt the task later, so it can clear
     * its reference to it.
     *