public async Task <Nothing> AppendAsync(
AggregateId aggregateId,
IReadOnlyList <IDomainEvent> domainEvents,
long expectedVersion)
{
if (domainEvents.Count > 0)
{
var connection = await EventStoreConnectionProvider.GrabSingleEventStoreConnectionFor(_connectionString);
var results = await connection.ConditionalAppendToStreamAsync(
aggregateId.ToStreamName(_eventStoreName),
expectedVersion,
domainEvents.Select(e => e.ToEventData()));
switch (results.Status)
{
case ConditionalWriteStatus.Succeeded:
break;
case ConditionalWriteStatus.VersionMismatch:
throw new VersionMismatchException(aggregateId.ToStreamName(_eventStoreName), expectedVersion);
case ConditionalWriteStatus.StreamDeleted:
throw new StreamDeletedException(aggregateId.ToStreamName(_eventStoreName));
default:
throw new ArgumentOutOfRangeException();
}
}
return(Nothing.NotAtAll);
}
public async Task <IReadOnlyList <IDomainEvent> > AsyncLoadAllEventsFor(AggregateId aggregateId)
{
var connection = await EventStoreConnectionProvider.GrabSingleEventStoreConnectionFor(_connectionString);
var resolvedEvents = await connection.ReadAllStreamEventsForward(aggregateId.ToStreamName(_eventStoreName));
return(resolvedEvents.Select(e => e.Event.ToDomainEvent()).ToList());
}
private IEventStoreSubscription EventStoreSubscriptionFrom(string streamName, long lastCheckpoint)
{
var connection = EventStoreConnectionProvider.GrabSingleEventStoreConnectionFor(_connectionString).Result;
var eventStream = new BlockingCollection <IDomainEvent>();
var catchUpSubscription = connection.SubscribeToStreamFrom(
streamName,
lastCheckpoint == 0 ? (long?)null : lastCheckpoint,
CatchUpSubscriptionSettings.Default,
(_, x) => eventStream.Add(x.Event.ToDomainEvent()));
return(new EventStoreSubscription(catchUpSubscription, eventStream));
}