public T GetById <T>(Guid aggregateId) where T : IAggregate
{
var loadFromEvent = 0L;
// Check for Snapshots
var lastEventIndex = _eventRepository.GetVersionByAggregateId(aggregateId);
var snapshotSize = _aggregateFactory.GetSnapshotSize <T>();
if (lastEventIndex.HasValue && lastEventIndex.Value >= snapshotSize)
{
loadFromEvent = lastEventIndex.Value - lastEventIndex.Value % (snapshotSize + 1);
}
// Load events
var events = _eventRepository.GetEventsByAggregateId(loadFromEvent, aggregateId);
if (events == null)
{
throw new IndexOutOfRangeException("Could not find Aggregate with ID: " + aggregateId);
}
// Event spool aggregate
var aggregate = _aggregateFactory.Create <T>(
aggregateId,
events.Select(x => x.EventPayload).ToArray()
);
aggregate.Version = lastEventIndex ?? 0;
return(aggregate);
}