public async Task <Saga> Handle(GetSagaQuery request, CancellationToken cancellationToken = default)
{
var saga = await _repository.GetAsync(request.Id, cancellationToken);
if (saga is null)
{
throw new SagaNotFoundException(request.Id.ToString());
}
return(saga);
}
public async Task <IEnumerable <Chapter> > Handle(GetAllChaptersQuery request, CancellationToken cancellationToken = default)
{
var saga = await _sagaRepository.GetAsync(request.SagaId, cancellationToken);
if (saga is null)
{
throw new SagaNotFoundException(request.SagaId.ToString());
}
var chapters = await _chapterRepository.GetAsync(request.SagaId, cancellationToken);
return(chapters?.AsReadOnly() ?? Enumerable.Empty <Chapter>());
}
public async Task <Unit> Handle(UpdateSagaCommand request, CancellationToken cancellationToken = default)
{
var timestamp = DateTimeOffset.UtcNow;
var saga = await _repository.GetAsync(request.Id, cancellationToken);
if (saga == null)
{
throw new SagaNotFoundException(request.Id.ToString());
}
if (request.Title != null)
{
saga.Title = request.Title;
saga.UpdatedAt = timestamp;
}
await _repository.UpdateAsync(saga.Id, saga, cancellationToken);
return(Unit.Value);
}
public async Task <Chapter> Handle(CreateChapterCommand request, CancellationToken cancellationToken = default)
{
var saga = await _sagaRepository.GetAsync(request.SagaId, cancellationToken);
if (saga is null)
{
throw new SagaNotFoundException(request.SagaId.ToString());
}
var timestamp = DateTimeOffset.UtcNow;
var chapter = new Chapter
{
Id = Guid.NewGuid(),
SagaId = request.SagaId,
Content = request.Content,
CreatedAt = timestamp,
UpdatedAt = timestamp,
};
return(await _chapterRepository.CreateAsync(chapter, cancellationToken));
}
public async Task <Unit> Handle(DeleteSagaCommand request, CancellationToken cancellationToken = default)
{
var saga = await _sagaRepository.GetAsync(request.SagaId, cancellationToken);
if (saga == null)
{
throw new SagaNotFoundException(request.SagaId.ToString());
}
// We cascade delete the chapters
var chapters = await _chapterRepository.GetAsync(request.SagaId, cancellationToken);
if (chapters != null)
{
foreach (var chapter in chapters)
{
await _chapterRepository.RemoveAsync(chapter, cancellationToken);
}
}
await _sagaRepository.RemoveAsync(saga, cancellationToken);
return(Unit.Value);
}
public async Task <IEnumerable <Saga> > Handle(GetAllSagasQuery request, CancellationToken cancellationToken = default)
{
var sagas = await _repository.GetAsync(cancellationToken);
return(sagas?.AsReadOnly() ?? Enumerable.Empty <Saga>());
}