public async Task <TAggregate> GetAsync <TAggregate>(string id, int version) where TAggregate : class, IAggregate
{
if (version <= 0)
{
throw new InvalidOperationException("Cannot get version <= 0");
}
var streamName = id;
Type aggregateType = typeof(TAggregate);
var instanceOfState = AggregateStateFactory.CreateStateFor(aggregateType);
long sliceStart = 0;
StreamEventsSlice currentSlice;
do
{
int sliceCount = (sliceStart + ReadPageSize <= version) ? ReadPageSize : (int)(version - sliceStart + 1);
currentSlice = await EventStoreConnection.ReadStreamEventsForwardAsync(streamName, sliceStart, sliceCount, false);
if (currentSlice.Status == SliceReadStatus.StreamNotFound)
{
break;
}
if (currentSlice.Status == SliceReadStatus.StreamDeleted)
{
break;
}
sliceStart = currentSlice.NextEventNumber;
foreach (var evnt in currentSlice.Events)
{
instanceOfState.Mutate(DeserializeEvent(evnt.OriginalEvent.Metadata, evnt.OriginalEvent.Data));
if (instanceOfState.Version == version)
{
return(Activator.CreateInstance(aggregateType, instanceOfState) as TAggregate);
}
}
} while (version >= currentSlice.NextEventNumber && !currentSlice.IsEndOfStream);
if (instanceOfState.Version == 0)
{
return(null);
}
return(Activator.CreateInstance(aggregateType, instanceOfState) as TAggregate);
}
public void aggregate_state_factory_given_aggregate_creates_state()
{
var state = AggregateStateFactory.CreateStateFor(typeof(PersonAggregate));
Assert.That(state is PersonAggregateState);
}
