public async Task <Unit> Handle(UpdateActorCommand request, CancellationToken cancellationToken)
{
ArgumentNullException.ThrowIfNull(request, nameof(request));
_logger.LogInformation("Updating actor with ActorId: {ActorId}.", request.ActorId);
var actorId = new ActorId(request.ActorId);
var externalId = new ExternalActorId(request.ExternalActorId);
var actor = new Actor(actorId, externalId);
await _actorRepository.AddOrUpdateAsync(actor).ConfigureAwait(false);
return(Unit.Value);
}