public void Handle(UpdatePeerSubscriptionsCommand message)
        {
            var stopwatch      = Stopwatch.StartNew();
            var peerDescriptor = _peerRepository.UpdatePeerSubscriptions(message.PeerId, message.Subscriptions, message.TimestampUtc);

            if (peerDescriptor != null)
            {
                _bus.Publish(new PeerSubscriptionsUpdated(peerDescriptor));
            }
            _speedReporter.ReportSubscriptionUpdateDuration(stopwatch.Elapsed);
        }