public async Task SaveAsync(Type aggregateType, IAggregateIdentity aggregateId, ICollection <IEvent> events, CancellationToken cancellationToken = default(CancellationToken))
{
if (events.Count == 0)
{
return;
}
var partition = GetPartition(aggregateType, aggregateId);
lock (eventStore)
{
Tuple <ETag, List <EventEntity> > eTaggedEvents;
if (eventStore.TryGetValue(partition, out eTaggedEvents))
{
// Check my last ETag against the current ETag
var dbETag = eTaggedEvents.Item1;
ETag myETag;
if (idToETag.TryGetValue(aggregateId, out myETag) && myETag != dbETag)
{
throw new Ddd.Domain.Exceptions.ConcurrencyException(aggregateType, aggregateId);
}
var eventsEntities = eTaggedEvents.Item2;
var lastVer = eventsEntities.Count;
eventsEntities.AddRange(events.Select(e => ToEventEntity(e, ++lastVer)));
var eTag = ETag.NewGuid();
eventStore[partition] = new Tuple <ETag, List <EventEntity> >(
eTag,
eventsEntities);
idToETag[aggregateId] = eTag; // Remeber current ETag
}
else
{
var eTag = ETag.NewGuid();
var lastVer = 0;
var eventsEntities = events.Select(e => ToEventEntity(e, ++lastVer)).ToList();
eventStore.Add(partition, new Tuple <ETag, List <EventEntity> >(
eTag,
eventsEntities));
idToETag.Add(aggregateId, eTag); // Remeber current ETag
}
}
await bus.PublishAsync(events);
}