/// <summary>
/// Get the values of the natural id fields as known to the underlying
/// database, or null if the entity has no natural id or there is no
/// corresponding row.
/// </summary>
public async Task <object[]> GetNaturalIdSnapshotAsync(object id, IEntityPersister persister, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
if (!persister.HasNaturalIdentifier)
{
return(null);
}
// if the natural-id is marked as non-mutable, it is not retrieved during a
// normal database-snapshot operation...
int[] props = persister.NaturalIdentifierProperties;
bool[] updateable = persister.PropertyUpdateability;
bool allNatualIdPropsAreUpdateable = true;
for (int i = 0; i < props.Length; i++)
{
if (!updateable[props[i]])
{
allNatualIdPropsAreUpdateable = false;
break;
}
}
if (allNatualIdPropsAreUpdateable)
{
// do this when all the properties are updateable since there is
// a certain likelihood that the information will already be
// snapshot-cached.
object[] entitySnapshot = await(GetDatabaseSnapshotAsync(id, persister, cancellationToken)).ConfigureAwait(false);
if (entitySnapshot == NoRow)
{
return(null);
}
object[] naturalIdSnapshot = new object[props.Length];
for (int i = 0; i < props.Length; i++)
{
naturalIdSnapshot[i] = entitySnapshot[props[i]];
}
return(naturalIdSnapshot);
}
else
{
return(await(persister.GetNaturalIdentifierSnapshotAsync(id, session, cancellationToken)).ConfigureAwait(false));
}
}
