private void ForwardOrDelay(ByteString payload)
{
if (InboundThrottleMode is Blackhole)
{
// Do nothing
}
else
{
if (!ThrottledMessages.Any())
{
var tokens = payload.Length;
var res = InboundThrottleMode.TryConsumeTokens(MonotonicClock.GetNanos(), tokens);
var newBucket = res.Item1;
var success = res.Item2;
if (success)
{
InboundThrottleMode = newBucket;
UpstreamListener.Notify(new InboundPayload(payload));
}
else
{
ThrottledMessages.Enqueue(payload);
ScheduleDequeue(InboundThrottleMode.TimeToAvailable(MonotonicClock.GetNanos(), tokens));
}
}
else
{
ThrottledMessages.Enqueue(payload);
}
}
}
private void InitializeFSM()
{
When(ThrottlerState.WaitExposedHandle, @event =>
{
if (@event.FsmEvent is ThrottlerManager.Handle && @event.StateData is Uninitialized)
{
// register to downstream layer and wait for origin
OriginalHandle.ReadHandlerSource.SetResult(new ActorHandleEventListener(Self));
return
(GoTo(ThrottlerState.WaitOrigin)
.Using(
new ExposedHandle(
@event.FsmEvent.AsInstanceOf <ThrottlerManager.Handle>().ThrottlerHandle)));
}
return(null);
});
When(ThrottlerState.WaitOrigin, @event =>
{
if (@event.FsmEvent is InboundPayload && @event.StateData is ExposedHandle)
{
var b = @event.FsmEvent.AsInstanceOf <InboundPayload>().Payload;
ThrottledMessages.Enqueue(b);
var origin = PeekOrigin(b);
if (origin != null)
{
Manager.Tell(new ThrottlerManager.Checkin(origin, @event.StateData.AsInstanceOf <ExposedHandle>().Handle));
return(GoTo(ThrottlerState.WaitMode));
}
return(Stay());
}
return(null);
});
When(ThrottlerState.WaitMode, @event =>
{
if (@event.FsmEvent is InboundPayload)
{
var b = @event.FsmEvent.AsInstanceOf <InboundPayload>().Payload;
ThrottledMessages.Enqueue(b);
return(Stay());
}
if (@event.FsmEvent is ThrottleMode && @event.StateData is ExposedHandle)
{
var mode = @event.FsmEvent.AsInstanceOf <ThrottleMode>();
var exposedHandle = @event.StateData.AsInstanceOf <ExposedHandle>().Handle;
InboundThrottleMode = mode;
try
{
if (mode is Blackhole)
{
ThrottledMessages = new Queue <ByteString>();
exposedHandle.Disassociate();
return(Stop());
}
else
{
AssociationHandler.Notify(new InboundAssociation(exposedHandle));
var self = Self;
exposedHandle.ReadHandlerSource.Task.ContinueWith(
r => new ThrottlerManager.Listener(r.Result),
TaskContinuationOptions.ExecuteSynchronously)
.PipeTo(self);
return(GoTo(ThrottlerState.WaitUpstreamListener));
}
}
finally
{
Sender.Tell(SetThrottleAck.Instance);
}
}
return(null);
});
When(ThrottlerState.WaitUpstreamListener, @event =>
{
if (@event.FsmEvent is InboundPayload)
{
var b = @event.FsmEvent.AsInstanceOf <InboundPayload>();
ThrottledMessages.Enqueue(b.Payload);
return(Stay());
}
if (@event.FsmEvent is ThrottlerManager.Listener)
{
UpstreamListener = @event.FsmEvent.AsInstanceOf <ThrottlerManager.Listener>().HandleEventListener;
Self.Tell(new Dequeue());
return(GoTo(ThrottlerState.Throttling));
}
return(null);
});
When(ThrottlerState.WaitModeAndUpstreamListener, @event =>
{
if (@event.FsmEvent is ThrottlerManager.ListenerAndMode)
{
var listenerAndMode = @event.FsmEvent.AsInstanceOf <ThrottlerManager.ListenerAndMode>();
UpstreamListener = listenerAndMode.HandleEventListener;
InboundThrottleMode = listenerAndMode.Mode;
Self.Tell(new Dequeue());
return(GoTo(ThrottlerState.Throttling));
}
if (@event.FsmEvent is InboundPayload)
{
var b = @event.FsmEvent.AsInstanceOf <InboundPayload>();
ThrottledMessages.Enqueue(b.Payload);
return(Stay());
}
return(null);
});
When(ThrottlerState.Throttling, @event =>
{
if (@event.FsmEvent is ThrottleMode)
{
var mode = @event.FsmEvent.AsInstanceOf <ThrottleMode>();
InboundThrottleMode = mode;
if (mode is Blackhole)
{
ThrottledMessages = new Queue <ByteString>();
}
CancelTimer(DequeueTimerName);
if (ThrottledMessages.Any())
{
ScheduleDequeue(InboundThrottleMode.TimeToAvailable(MonotonicClock.GetNanos(), ThrottledMessages.Peek().Length));
}
Sender.Tell(SetThrottleAck.Instance);
return(Stay());
}
if (@event.FsmEvent is InboundPayload)
{
ForwardOrDelay(@event.FsmEvent.AsInstanceOf <InboundPayload>().Payload);
return(Stay());
}
if (@event.FsmEvent is Dequeue)
{
if (ThrottledMessages.Any())
{
var payload = ThrottledMessages.Dequeue();
UpstreamListener.Notify(new InboundPayload(payload));
InboundThrottleMode = InboundThrottleMode.TryConsumeTokens(MonotonicClock.GetNanos(),
payload.Length).Item1;
if (ThrottledMessages.Any())
{
ScheduleDequeue(InboundThrottleMode.TimeToAvailable(MonotonicClock.GetNanos(), ThrottledMessages.Peek().Length));
}
}
return(Stay());
}
return(null);
});
WhenUnhandled(@event =>
{
// we should always set the throttling mode
if (@event.FsmEvent is ThrottleMode)
{
InboundThrottleMode = @event.FsmEvent.AsInstanceOf <ThrottleMode>();
Sender.Tell(SetThrottleAck.Instance);
return(Stay());
}
if (@event.FsmEvent is Disassociated)
{
return(Stop()); // not notifying the upstream handler is intentional: we are relying on heartbeating
}
if (@event.FsmEvent is FailWith)
{
var reason = @event.FsmEvent.AsInstanceOf <FailWith>().FailReason;
if (UpstreamListener != null)
{
UpstreamListener.Notify(new Disassociated(reason));
}
return(Stop());
}
return(null);
});
if (Inbound)
{
StartWith(ThrottlerState.WaitExposedHandle, Uninitialized.Instance);
}
else
{
OriginalHandle.ReadHandlerSource.SetResult(new ActorHandleEventListener(Self));
StartWith(ThrottlerState.WaitModeAndUpstreamListener, Uninitialized.Instance);
}
}