public async Task <TAggregate> GetAsync(Guid id)
{
var events = new List <AggregateEvent>();
StreamEventsSlice currentSlice;
long nextSliceStart = StreamPosition.Start;
var streamName = EventStoreExtensions.GetStreamName <TAggregate>(id);
int batchSize = 100;
do
{
currentSlice = await _connection
.ReadStreamEventsForwardAsync(streamName, nextSliceStart, batchSize, false);
nextSliceStart = currentSlice.NextEventNumber;
events.AddRange(currentSlice.Events.Select(x => (AggregateEvent)x.DeserializeEvent()));
} while (!currentSlice.IsEndOfStream);
var aggregate = _factory.Create <TAggregate>(events);
return(aggregate);
}
public async Task SaveAsync(AggregateRoot aggregate)
{
var commitId = Guid.NewGuid();
var events = aggregate.UncommittedEvents;
if (events.Any() == false)
{
return;
}
var streamName = EventStoreExtensions.GetStreamName <TAggregate>(aggregate.AggregateId);
var originalVersion = aggregate.Version;// - events.Count();
var expectedVersion = originalVersion == 0 ? ExpectedVersion.NoStream : originalVersion - 1;
var commitHeaders = new Dictionary <string, object>
{
{ "CommitId", commitId },
{ "AggregateClrType", aggregate.GetType().AssemblyQualifiedName }
};
var eventsToSave = events.Select(e => e.ToEventData(commitHeaders)).ToList();
await _connection.AppendToStreamAsync(streamName, expectedVersion, eventsToSave);
aggregate.MarkChangesAsCommitted();
}
