func (s *levelDB) readOptions(opts *keyvalue.Options) *levigo.ReadOptions {
if snap := opts.GetSnapshot(); snap != nil {
ro := levigo.NewReadOptions()
ro.SetSnapshot(snap.(*snapshot).s)
ro.SetFillCache(!opts.IsLargeRead())
return ro
}
if opts.IsLargeRead() {
return s.largeReadOpts
}
return s.readOpts
}
// iterator creates a new levigo Iterator based on the given options. It also
// returns any ReadOptions that should be Closed once the Iterator is Closed.
func (s *levelDB) iterator(opts *keyvalue.Options) (*levigo.Iterator, *levigo.ReadOptions) {
if snap := opts.GetSnapshot(); snap != nil {
ro := levigo.NewReadOptions()
ro.SetSnapshot(snap.(*snapshot).s)
ro.SetFillCache(!opts.IsLargeRead())
return s.db.NewIterator(ro), ro
}
if opts.IsLargeRead() {
return s.db.NewIterator(s.largeReadOpts), nil
}
return s.db.NewIterator(s.readOpts), nil
}