private async Task MainLoop()
{
var cancellationToken = _applicationLifetime.ApplicationStopping;
try
{
while (!cancellationToken.IsCancellationRequested)
{
var turnOnRequest = await _eventHub.ReceiveTurnOnRequestedMessage(cancellationToken);
if (turnOnRequest.RequestedOperationalMode == OperationalMode.Timed)
{
_relayService.TurnOn();
CancellationTokenSource turnOffRequestAwaitCancellationTokenSource = new CancellationTokenSource();
var turnOffRequestTask =
_eventHub.ReceiveTurnOffRequestedMessage
(
CancellationTokenSource.CreateLinkedTokenSource
(
cancellationToken,
turnOffRequestAwaitCancellationTokenSource.Token
).Token
);
var desiredTurnOnDurationElapsedTask = Task.Delay(turnOnRequest.DesiredDuration, cancellationToken);
var completedTask = await Task.WhenAny(turnOffRequestTask, desiredTurnOnDurationElapsedTask);
_relayService.TurnOff();
if (completedTask == desiredTurnOnDurationElapsedTask)
{
turnOffRequestAwaitCancellationTokenSource.Cancel();
_eventHub.PostTimedTurnOffNotificationMessage(new TimedTurnOffNotificationMessage());
}
}
if (turnOnRequest.RequestedOperationalMode == OperationalMode.Thermostat)
{
var turnOffTask = _eventHub.ReceiveTurnOffRequestedMessage(cancellationToken);
while (!turnOffTask.IsCompleted)
{
await Task.Delay(TimeSpan.FromSeconds(5), cancellationToken);
var temperatureMeasurement = await _eventHub.ReceiveTemperatureMeasurement(cancellationToken);
if (temperatureMeasurement.Temperature < turnOnRequest.DesiredTemperature)
{
_relayService.TurnOn();
}
else
{
_relayService.TurnOff();
}
}
_relayService.TurnOff();
}
}
}
catch (OperationCanceledException) when(cancellationToken.IsCancellationRequested)
{
_logger.LogInformation("Stopped listening for events.");
}
catch (Exception ex)
{
_logger.LogError(ex, "Unexpected control failure.");
}
}