public override async Task <TAggregate> LoadById(string aggregateId)
{
Argument.StringNotEmpty(aggregateId, nameof(aggregateId));
AggregateSnapshot snapshot = await _snapshotStore.GetSnapshot(aggregateId);
if (snapshot == null)
{
return(await base.LoadById(aggregateId));
}
var aggregate = new TAggregate {
Id = aggregateId
};
aggregate.Restore(snapshot);
var stream = await _eventStore.GetStreamAsync(aggregateId, snapshot.Version + 1); //todo
aggregate.Version = stream.Version;
aggregate.Reel(stream.Events);
aggregate.SetStatus(_eventStore.FirstEventIndex, stream.IsClosed);
return(aggregate);
}
public override async Task Save(TAggregate aggregate)
{
await base.Save(aggregate);
int currentVersion = aggregate.Version;
if (currentVersion > 0 && currentVersion % _interval == 0)
{
AggregateSnapshot snapshot = aggregate.MakeSnapshot();
await _snapshotStore.SaveSnapshot(snapshot);
}
}
public BsonDocument Serialize(AggregateSnapshot snapshot)
{
return new BsonDocument()
{
{ AggregateIdElement, snapshot.AggregateId },
{ AggregateTypeElement, snapshot.AggregateType.AssemblyQualifiedName },
{ VersionElement, snapshot.Version },
{ TimestampElement, snapshot.Timestamp },
{ StateTypeElement, snapshot.State.GetType().AssemblyQualifiedName },
{ StateElement, _dataSerializer.Serialize(snapshot.State) },
};
}
internal static void Restore(this IAggregateRoot aggregate, AggregateSnapshot snapshot)
{
if (aggregate.Id != snapshot.AggregateId)
{
throw new InvalidOperationException("Invalid aggregateId in snapshopt.");
}
if (aggregate.GetType() != snapshot.AggregateType)
{
throw new InvalidOperationException("Trying to restore aggregate with wrong snapshot type.");
}
if (aggregate.State.GetType() != snapshot.State.GetType())
{
throw new InvalidOperationException("Trying to restore aggregate with wrong snapshot state type.");
}
aggregate.State = snapshot.State;
aggregate.Version = snapshot.Version;
}
public async Task SaveSnapshot(AggregateSnapshot snapshot)
{
await GetCollection().ReplaceOneAsync(_snapshotSerializer.GetIdFilter(snapshot.AggregateId), _snapshotSerializer.Serialize(snapshot), MockUpsert);
}