public async Task SetLightsState(LightsStateViewModel lightsState)
{
if (!_lightSwitchDbService.AnyLightsToSwitchToTargetState(lightsState))
{
return;
}
var transition = GetLightSwitchTransition(lightsState.State);
lightsState.State = transition[0];
// trigger light changing on all clients to disable switch
_controlHub.Clients.All.SetAllLightsState(lightsState);
// save new state to db so new requests fetch updated state
var cancellationTokenSource = new CancellationTokenSource();
var cancellationToken = cancellationTokenSource.Token;
var saving = _lightSwitchDbService.SetLightsState(lightsState, cancellationToken);
// send request to set lights
lightsState.State = transition[1];
var transitionRequestSent = _queueService.SendLightsState(lightsState.LightIds, transition[1]);
if (!transitionRequestSent)
{
// could not send transition request, rollback all actions
cancellationTokenSource.Cancel();
}
await saving;
}
public bool AnyLightsToSwitchToTargetState(LightsStateViewModel lightsState)
{
_context.Lights
.Where(x => x.State != lightsState.State)
.WhereFilterIsEmptyOrContains(x => x.Id, lightsState.LightIds)
.Load();
wasFetchingLightsToSwitch = true;
return(_context.Lights.Local.Any());
}
public Task <int> SetLightsState(LightsStateViewModel lightsState, CancellationToken cancellationToken)
{
List <Light> lightsToSwitch;
if (wasFetchingLightsToSwitch)
{
lightsToSwitch = _context.Lights.Local.ToList();
}
else
{
lightsToSwitch = _context.Lights
.Where(x => x.State != lightsState.State)
.WhereFilterIsEmptyOrContains(x => x.Id, lightsState.LightIds)
.ToList();
}
lightsToSwitch.ForEach(x => x.State = lightsState.State);
return(_context.SaveChangesAsync(cancellationToken));
}
public async Task SetAllLightsState(LightsStateViewModel lightsState)
{
await _lightSwitchService.SetLightsState(lightsState);
}
