protected override Task WriteEventsToStoreAsync(IEnumerable <IDomainEventDescriptor> events, CancellationToken cancellationToken)
{
foreach (var @event in events)
{
var streams = _store.GetOrAdd(@event.AggregateType, new ConcurrentDictionary <string, List <IDomainEventDescriptor> >());
var eventsList = streams.GetOrAdd(@event.AggregateId, new List <IDomainEventDescriptor>());
var publishedEvent = DomainEventDescriptor.FromStore(@event.AggregateType, @event.AggregateId, @event.Event, @event.Version, @event.EventType);
eventsList.Add(publishedEvent);
}
return(Task.CompletedTask);
}
public override async IAsyncEnumerable <IDomainEventDescriptor> GetAggregateEvents <TKey>(string aggregateType, TKey id, long afterVersion, [EnumeratorCancellation] CancellationToken cancellationToken)
{
var streamName = GenerateStreamId(aggregateType, id);
ReadStreamResult eventStoreDbEvents;
if (afterVersion == -1)
{
eventStoreDbEvents = EventStoreClient.ReadStreamAsync(
Direction.Forwards,
streamName,
StreamPosition.Start,
cancellationToken: cancellationToken);
}
else
{
eventStoreDbEvents = EventStoreClient.ReadStreamAsync(
Direction.Forwards,
streamName,
StreamPosition.FromInt64(afterVersion + 1),
cancellationToken: cancellationToken);
}
if (await eventStoreDbEvents.ReadState == ReadState.StreamNotFound)
{
yield break;
}
var eventDescriptors = eventStoreDbEvents.Select(@event =>
{
var version = @event.Event.EventNumber.ToInt64();
var bsonData = @event.Event.Data;
var bsonMetadata = @event.Event.Metadata;
var eventType = @event.Event.EventType;
DomainEventDescriptor descriptor;
using (var stream = bsonData.AsStream())
using (var reader = new BsonDataReader(stream))
{
JsonSerializer serializer = new JsonSerializer();
serializer.TypeNameHandling = TypeNameHandling.All;
var domainEvent = serializer.Deserialize <IDomainEvent>(reader);
descriptor = DomainEventDescriptor.FromStore(aggregateType, id.ToString(), domainEvent, version, eventType);
}
using (var stream = bsonMetadata.AsStream())
using (var reader = new BsonDataReader(stream))
{
JsonSerializer serializer = new JsonSerializer();
serializer.TypeNameHandling = TypeNameHandling.All;
var metadata = serializer.Deserialize <IDictionary <string, string> >(reader);
foreach (var keyValue in metadata)
{
descriptor.Metadata.Add(keyValue.Key, keyValue.Value);
}
}
return(descriptor);
});
await foreach (var eventDescriptor in eventDescriptors)
{
yield return(eventDescriptor);
}
}
