public (DecrementModel model, Version version) Load(IEventstore es, Decrement command)
{
var model = new DecrementModel {
CounterExists = _counterIds.Contains(command.CounterId),
};
return(model, es.Version(command.CounterId));
}
public (CommandStatus commandStatus, Event[] events, Notification[] notifications) Execute(Decrement command, DecrementModel model)
{
if (model.CounterExists is false)
{
return(new Failure("Counter not found! Increment first."), new Event[0], new Notification[0]);
}
return(new Success(),
new Event[] { new Decremented {
CounterId = command.CounterId
} },
new Notification[0]);
}
