private DiscardableCallback versionCallback;
public GenericOperationChannel(TimerService scheduler, Transformer<M> transformer,
ReceiveOpChannel<M> channel, SendOpService<M> submitService,
Listener<M> listener, Log logger) {
this(new FuzzingBackOffGenerator(1500, 1800 * 1000, 0.5),
scheduler, transformer, channel, submitService, listener, logger);
}