@Override
  public boolean awaitTermination(long duration, TimeUnit unit) throws InterruptedException {
    return backgroundResources.awaitTermination(duration, unit);
  }
Constructs an instance of GrpcStorageBatchOperationsStub, using the given settings. This is
protected so that it is easy to make a subclass, but otherwise, the static factory methods
should be preferred.
java-storagebatchoperations/google-cloud-storagebatchoperations/src/main/java/com/google/cloud/storagebatchoperations/v1/stub/GrpcStorageBatchOperationsStub.java