Method _nextSequence

db/sequence_allocator.go:329–341

_nextSequence reserves if needed, and then returns the next sequence

(ctx context.Context)

// _nextSequence reserves if needed, and then returns the next sequence
func (s *sequenceAllocator) _nextSequence(ctx context.Context) (sequence uint64, sequencesReserved bool, err error) {
	if s.last >= s.max {
		if err := s._reserveSequenceBatch(ctx); err != nil {
			return 0, false, err
		}
		sequencesReserved = true
	}
	s.last++
	sequence = s.last
	s.dbStats.SequenceAssignedCount.Add(1)
	s.dbStats.LastSequenceAssignedValue.Set(int64(sequence))
	return sequence, sequencesReserved, nil
}

// Reserve a new sequence range, based on batch size.  Called by nextSequence when the previously allocated sequences have all been used.
func (s *sequenceAllocator) _reserveSequenceBatch(ctx context.Context) error {