@java.lang.Override
    @java.lang.SuppressWarnings("unchecked")
    public void invoke(Req request, io.grpc.stub.StreamObserver<Resp> responseObserver) {
      switch (methodId) {
        case METHODID_SYNTHESIZE_LONG_AUDIO:
          serviceImpl.synthesizeLongAudio(
              (com.google.cloud.texttospeech.v1.SynthesizeLongAudioRequest) request,
              (io.grpc.stub.StreamObserver<com.google.longrunning.Operation>) responseObserver);
          break;
        default:
          throw new AssertionError();
      }
    }
<pre>
Synthesizes long form text asynchronously.
</pre>
java-texttospeech/grpc-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/TextToSpeechLongAudioSynthesizeGrpc.java