public static WorkflowsFutureStub newFutureStub(io.grpc.Channel channel) {
    io.grpc.stub.AbstractStub.StubFactory<WorkflowsFutureStub> factory =
        new io.grpc.stub.AbstractStub.StubFactory<WorkflowsFutureStub>() {
          @java.lang.Override
          public WorkflowsFutureStub newStub(
              io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
            return new WorkflowsFutureStub(channel, callOptions);
          }
        };
    return WorkflowsFutureStub.newStub(factory, channel);
  }
Creates a new ListenableFuture-style stub that supports unary calls on the service
java-workflows/grpc-google-cloud-workflows-v1beta/src/main/java/com/google/cloud/workflows/v1beta/WorkflowsGrpc.java