public async Task <CommandResult> ExecuteActionAsync(DeviceAction action, CancellationToken cancellationToken)
{
var result = CommandResult.NotApplied;
IDeviceCommand command;
if (_commands.TryGet(c => c.Action == action, out command) &&
CanApplyCommand(command))
{
var execution = ApplyCommandsAsync(new[] { command }, cancellationToken);
if (execution != null)
{
RecentCommandExecution = new DeviceCommandExecution(execution, command.TargetState);
result = await execution;
}
}
return(result);
}
public bool TryGoToState(DeviceState targetState, CancellationToken cancellationToken, out Task <CommandResult> execution)
{
var currentState = State;
execution = null;
if (RecentCommandExecution.IsWorking == false && currentState != targetState)
{
IEnumerable <IDeviceCommand> commands = Enumerable.Empty <IDeviceCommand>();
var availableTriggers = _states.PermittedTriggers.ToArray();
if (currentState == DeviceState.Error)
{ // shortcut instead of double routing to target state first through disconnect after error and then forward to the target state.
commands = _commands.Backward
.SkipWhile(c => availableTriggers.Contains(c.Action) == false)
.Concat(_commands.Forward.TakeUntil(c => c.TargetState == targetState));
}
else if (currentState < targetState)
{
commands = _commands.Forward
.SkipWhile(c => availableTriggers.Contains(c.Action) == false)
.TakeUntil(c => c.TargetState == targetState);
}
else if (currentState > targetState)
{
commands = _commands.Backward
.SkipWhile(c => availableTriggers.Contains(c.Action) == false)
.TakeUntil(c => c.TargetState == targetState);
}
execution = ApplyCommandsAsync(commands, cancellationToken);
if (execution != null)
{
RecentCommandExecution = new DeviceCommandExecution(execution, targetState);
return(true);
}
}
return(false);
}
