@java.lang.Override
    @java.lang.SuppressWarnings("unchecked")
    public io.grpc.stub.StreamObserver<Req> invoke(
        io.grpc.stub.StreamObserver<Resp> responseObserver) {
      switch (methodId) {
        default:
          throw new AssertionError();
      }
    }
<pre>
Updates an existing workflow.
Running this method has no impact on already running executions of the
workflow. A new revision of the workflow may be created as a result of a
successful update operation. In that case, such revision will be used
in new workflow executions.
</pre>
java-workflows/grpc-google-cloud-workflows-v1beta/src/main/java/com/google/cloud/workflows/v1beta/WorkflowsGrpc.java