public final UnaryCallable<BatchWriteSpansRequest, Empty> batchWriteSpansCallable() {
    return stub.batchWriteSpansCallable();
  }
Batch writes new spans to new or existing traces. You cannot update existing spans.

<p>Sample code:

<pre>{@code
// This snippet has been automatically generated and should be regarded as a code template only.
// It will require modifications to work:
// - It may require correct/in-range values for request initialization.
// - It may require specifying regional endpoints when creating the service client as shown in
// https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
try (TraceServiceClient traceServiceClient = TraceServiceClient.create()) {
  BatchWriteSpansRequest request =
      BatchWriteSpansRequest.newBuilder()
          .setName(ProjectName.of("[PROJECT]").toString())
          .addAllSpans(new ArrayList<Span>())
          .build();
  ApiFuture<Empty> future = traceServiceClient.batchWriteSpansCallable().futureCall(request);
  // Do something.
  future.get();
}
}</pre>
java-trace/google-cloud-trace/src/main/java/com/google/cloud/trace/v2/TraceServiceClient.java