//Idempotent method
public async Task <Unit> Handle(UpdateCowCommand request, CancellationToken cancellationToken)
{
var model = await _snapShotRepository.GetAsync(request.Id);
if (model == default || (model.FarmId == request.FarmId && model.State == request.State))
{
return(Unit.Value);
}
model.FarmId = request.FarmId;
model.State = request.State;
await _snapShotRepository.SaveAsync(model);
await _eventRepository.UpdateAsync(model);
return(Unit.Value);
}
public Task <Cow> Handle(GetCowQuery request, CancellationToken cancellationToken)
{
return(_snapShotRepository.GetAsync(request.Id));
}