public UnaryCallable<Span, Span> createSpanCallable() {
    throw new UnsupportedOperationException("Not implemented: createSpanCallable()");
  }
Base stub class for the TraceService service API.

<p>This class is for advanced usage and reflects the underlying API directly.
java-trace/google-cloud-trace/src/main/java/com/google/cloud/trace/v2/stub/TraceServiceStub.java