/// <summary>
/// Get the current state of the entity as known to the underlying
/// database, or null if there is no corresponding row
/// </summary>
public async Task <object[]> GetDatabaseSnapshotAsync(object id, IEntityPersister persister, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
EntityKey key = session.GenerateEntityKey(id, persister);
object cached;
if (entitySnapshotsByKey.TryGetValue(key, out cached))
{
return(cached == NoRow ? null : (object[])cached);
}
else
{
object[] snapshot = await(persister.GetDatabaseSnapshotAsync(id, session, cancellationToken)).ConfigureAwait(false);
entitySnapshotsByKey[key] = snapshot ?? NoRow;
return(snapshot);
}
}
