public async Task Handle(RegisterSpeechCommandMessage command)
{
if (command == null)
{
throw new ArgumentNullApplicationException(nameof(command));
}
var title = new Title(command.Title);
var urlValue = new UrlValue(command.Url);
var description = new Description(command.Description);
var type = new SpeechType(command.Type);
var speech = new Domain.SpeechAggregate.Speech(AggregateId.NewId(), title, urlValue, description, type);
await _speechRepository.CreateAsync(speech);
await _domainEventSubscriber.Subscribe(speech);
}