private async Task OnArticlePublishedAsync(Messages.ArticlePublished msg)
{
try {
IUnitOfWorkInternal uow = (IUnitOfWorkInternal)await reactorRepo.LoadAsync(msg.SubscribingReactorId);
// guard race condition where a reactor has already caught up
bool alreadyReacted = uow.PersistedPubSub
// have we already delivered this publication (and if so, have we already seen this version or later)?
.Map(previous => previous.PublicationDeliveries.Any(sub => sub.PublicationId == msg.PublicationId && sub.VersionNumber >= msg.VersionNumber))
.GetOrElse(false);
if (alreadyReacted)
{
logger.LogInformation($"ReactorId {msg.SubscribingReactorId} in bucket {msg.ReactorBucket} received article {msg.Name} on subscription id {msg.SubscriptionId} from publishing reactor id {msg.PublishingReactorId} to but the article version {msg.VersionNumber} had already been delivered");
logger.LogDebug("{@PublicationDeliveries}", uow.PersistedPubSub.Get().PublicationDeliveries);
return;
}
//react to msg
await uow.Reactor.ReactAsync(msg, uow);
uow.RecordDelivery(msg);
//persist
await uow.CompleteAndPublishAsync();
} catch (Exception ex) {
logger.LogError(ex, $"ReactorID {msg.SubscribingReactorId} threw exception after receiving ArticlePublished message (Subscription TopicName={msg.Name},PublishingReactorId={msg.PublicationId},SubscribingReactorId={msg.SubscribingReactorId},Subscription={msg.SubscriptionId}");
}
}
public ArticlePublished ToMessage()
{
if (string.IsNullOrWhiteSpace(Name))
{
throw new ArgumentNullException("Name property was not set correctly during persistance");
}
var type = Type.GetType(ArticleSerialisationType, throwOnError: true);
var msg = new Messages.ArticlePublished(
SubscribingReactorBucket,
Name,
SubscribingReactorId,
PublishingReactorId,
VersionNumber,
SubscriptionId,
PublicationId,
JsonConvert.DeserializeObject(ArticleSerialisation, type)
);
return(msg);
}