/// <summary>
/// Processes an event and updates the current state.
/// </summary>
/// <param name="e">The event to process.</param>
/// <param name="currentState">The current watchdog state.</param>
/// <returns>The new watchdog state.</returns>
private static Zen <SwitchState> ProcessEvent(Zen <Event> e, Zen <SwitchState> currentState)
{
var switchState = currentState;
var burstEvent = Event.EventTypeAsByte(EventType.PacketBurstEvent);
var stormStartEvent = Event.EventTypeAsByte(EventType.PfcStormStartEvent);
var stormEndEvent = Event.EventTypeAsByte(EventType.PfcStormEndEvent);
// update the watchdog state based on detection
var conservativeDetectionTime = (ushort)(2 * detectionInterval);
var conservativeRestorationTime = (ushort)(2 * restorationInterval);
var isDetectionEvent1 = And(
switchState.GetStormStartedTime1() > switchState.GetStormEndedTime1(),
e.GetTimeStamp() - switchState.GetStormStartedTime1() >= conservativeDetectionTime);
var isDetectionEvent2 = And(
switchState.GetStormStartedTime2() > switchState.GetStormEndedTime2(),
e.GetTimeStamp() - switchState.GetStormStartedTime2() >= conservativeDetectionTime);
var isRestorationEvent1 = And(
switchState.GetStormEndedTime1() > switchState.GetStormStartedTime1(),
e.GetTimeStamp() - switchState.GetWatchdogStartDropTime1() >= conservativeRestorationTime);
var isRestorationEvent2 = And(
switchState.GetStormEndedTime2() > switchState.GetStormStartedTime2(),
e.GetTimeStamp() - switchState.GetWatchdogStartDropTime2() >= conservativeRestorationTime);
switchState = If(isRestorationEvent1, switchState.SetWatchdogDropPackets1(false), switchState);
switchState = If(isRestorationEvent2, switchState.SetWatchdogDropPackets2(false), switchState);
switchState = If(isDetectionEvent1, switchState.SetWatchdogStartDropTime1(e.GetTimeStamp()).SetWatchdogDropPackets1(true), switchState);
switchState = If(isDetectionEvent2, switchState.SetWatchdogStartDropTime2(e.GetTimeStamp()).SetWatchdogDropPackets2(true), switchState);
// update the watchdog state
var isBurstOn1 = And(e.GetEventType() == burstEvent, e.GetPriorityClass() == 0);
var isBurstOn2 = And(e.GetEventType() == burstEvent, e.GetPriorityClass() == 1);
var stateBurst1 = switchState.AddPacket(Pair(e.GetTimeStamp(), Pair <byte, bool>(0, currentState.GetWatchdogDropPackets1())));
var stateBurst2 = switchState.AddPacket(Pair(e.GetTimeStamp(), Pair <byte, bool>(1, currentState.GetWatchdogDropPackets1())));
var isStormStartOn1 = And(e.GetEventType() == stormStartEvent, e.GetPriorityClass() == 0);
var isStormStartOn2 = And(e.GetEventType() == stormStartEvent, e.GetPriorityClass() == 1);
var stateStormStartOn1 = switchState.SetStormStartedTime1(e.GetTimeStamp());
var stateStormStartOn2 = switchState.SetStormStartedTime2(e.GetTimeStamp());
var isStormEndOn1 = And(e.GetEventType() == stormEndEvent, e.GetPriorityClass() == 0);
var isStormEndOn2 = And(e.GetEventType() == stormEndEvent, e.GetPriorityClass() == 1);
var stateStormEndOn1 = switchState.SetStormEndedTime1(e.GetTimeStamp());
var stateStormEndOn2 = switchState.SetStormEndedTime2(e.GetTimeStamp());
return(Cases(switchState,
(isStormStartOn1, stateStormStartOn1),
(isStormStartOn2, stateStormStartOn2),
(isStormEndOn1, stateStormEndOn1),
(isStormEndOn2, stateStormEndOn2),
(isBurstOn1, stateBurst1),
(isBurstOn2, stateBurst2)));
}
/// <summary>
/// Processes an event and updates the current state.
/// </summary>
/// <param name="e">The event to process.</param>
/// <param name="currentState">The current watchdog state.</param>
/// <returns>The new watchdog state.</returns>
internal static Zen <SwitchState> ProcessEvent(Zen <Event> e, Zen <SwitchState> currentState)
{
var stormStartEvent = Event.EventTypeAsInt(EventType.PfcStormStartEvent);
var stormEndEvent = Event.EventTypeAsInt(EventType.PfcStormEndEvent);
var pollingIntervalEvent = Event.EventTypeAsInt(EventType.PollingIntervalEvent);
var isStormStartOn1 = And(e.GetEventType() == stormStartEvent, e.GetPriorityClass() == 0);
var isStormStartOn2 = And(e.GetEventType() == stormStartEvent, e.GetPriorityClass() == 1);
var stateStormStartOn1 = currentState.SetStormStartedTime1(e.GetTimeStamp());
var stateStormStartOn2 = currentState.SetStormStartedTime2(e.GetTimeStamp());
var isStormEndOn1 = And(e.GetEventType() == stormEndEvent, e.GetPriorityClass() == 0);
var isStormEndOn2 = And(e.GetEventType() == stormEndEvent, e.GetPriorityClass() == 1);
var stateStormEndOn1 = currentState.SetStormEndedTime1(e.GetTimeStamp());
var stateStormEndOn2 = currentState.SetStormEndedTime2(e.GetTimeStamp());
var isDetectionEvent1 = And(
e.GetEventType() == pollingIntervalEvent,
currentState.GetStormStartedTime1() > currentState.GetStormEndedTime1(),
e.GetTimeStamp() - currentState.GetStormStartedTime1() >= detectionInterval);
var isDetectionEvent2 = And(
e.GetEventType() == pollingIntervalEvent,
currentState.GetStormStartedTime2() > currentState.GetStormEndedTime2(),
e.GetTimeStamp() - currentState.GetStormStartedTime2() >= detectionInterval);
var stateDetectionOn1 = currentState.SetWatchdogStartDropTime1(e.GetTimeStamp()).SetWatchdogDropPackets1(true);
var stateDetectionOn2 = currentState.SetWatchdogStartDropTime2(e.GetTimeStamp()).SetWatchdogDropPackets2(true);
var isRestorationEvent1 = And(
e.GetEventType() == pollingIntervalEvent,
currentState.GetStormEndedTime1() > currentState.GetStormStartedTime1(),
e.GetTimeStamp() - currentState.GetWatchdogStartDropTime1() >= restorationInterval);
var isRestorationEvent2 = And(
e.GetEventType() == pollingIntervalEvent,
currentState.GetStormEndedTime2() > currentState.GetStormStartedTime2(),
e.GetTimeStamp() - currentState.GetWatchdogStartDropTime2() >= restorationInterval);
var stateRestorationOn1 = currentState.SetWatchdogDropPackets1(false);
var stateRestorationOn2 = currentState.SetWatchdogDropPackets2(false);
return(Cases(currentState,
(isStormStartOn1, stateStormStartOn1),
(isStormStartOn2, stateStormStartOn2),
(isStormEndOn1, stateStormEndOn1),
(isStormEndOn2, stateStormEndOn2),
(isDetectionEvent1, stateDetectionOn1),
(isDetectionEvent2, stateDetectionOn2),
(isRestorationEvent1, stateRestorationOn1),
(isRestorationEvent2, stateRestorationOn2)));
}