public static IAtomic <T, TT> BeginAddOrUpdate <T, TS, TT>(this BaseRepository <T, TS, TT> repo, T original, Func <T> default_function = null) where T : class, new()
{
return(repo.BeginAddOrUpdate(() =>
{
if (original == null)
{
return null;
}
T newentity = repo.GetByID(repo.SelectKey(original));
if (!ReferenceEquals(original, newentity))
{
newentity.DeepCloneTo(original); //this code will make sure, if original is "this"
}
//it will update their contents in case of a database roundtrip.
//so in case of cached repository, the referenceequals will be the same, in case of database roundtrip, will copy back the values to the entity.
//this roundtrip is important because, this call and the subsquent update, is inside a lock, and the original entity, might be obtained outside a lock
//this will grant some locking update on a multithread enviroment.
return original;
}, default_function));
}
public static IAtomic <T, TT> BeginAddOrUpdate <T, TS, TT>(this BaseRepository <T, TS, TT> repo, TS id, Func <T> default_function = null) where T : class, new()
{
return(repo.BeginAddOrUpdate(() => repo.GetByID(id), default_function));
}