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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
package lsmkv
import (
"github.com/weaviate/weaviate/entities/lsmkv"
)
type segmentCursorCollection struct {
segment *segment
nextOffset uint64
}
func (s *segment) newCollectionCursor() *segmentCursorCollection {
return &segmentCursorCollection{
segment: s,
}
}
func (sg *SegmentGroup) newCollectionCursors() ([]innerCursorCollection, func()) {
sg.maintenanceLock.RLock()
out := make([]innerCursorCollection, len(sg.segments))
for i, segment := range sg.segments {
out[i] = segment.newCollectionCursor()
}
return out, sg.maintenanceLock.RUnlock
}
func (s *segmentCursorCollection) seek(key []byte) ([]byte, []value, error) {
node, err := s.segment.index.Seek(key)
if err != nil {
return nil, nil, err
}
parsed, err := s.parseCollectionNode(nodeOffset{node.Start, node.End})
// make sure to set the next offset before checking the error. The error
// could be 'entities.Deleted' which would require that the offset is still advanced
// for the next cycle
s.nextOffset = node.End
if err != nil {
return parsed.primaryKey, nil, err
}
return parsed.primaryKey, parsed.values, nil
}
func (s *segmentCursorCollection) next() ([]byte, []value, error) {
if s.nextOffset >= s.segment.dataEndPos {
return nil, nil, lsmkv.NotFound
}
parsed, err := s.parseCollectionNode(nodeOffset{start: s.nextOffset})
// make sure to set the next offset before checking the error. The error
// could be 'entities.Deleted' which would require that the offset is still advanced
// for the next cycle
s.nextOffset = s.nextOffset + uint64(parsed.offset)
if err != nil {
return parsed.primaryKey, nil, err
}
return parsed.primaryKey, parsed.values, nil
}
func (s *segmentCursorCollection) first() ([]byte, []value, error) {
s.nextOffset = s.segment.dataStartPos
parsed, err := s.parseCollectionNode(nodeOffset{start: s.nextOffset})
// make sure to set the next offset before checking the error. The error
// could be 'entities.Deleted' which would require that the offset is still advanced
// for the next cycle
s.nextOffset = s.nextOffset + uint64(parsed.offset)
if err != nil {
return parsed.primaryKey, nil, err
}
return parsed.primaryKey, parsed.values, nil
}
func (s *segmentCursorCollection) parseCollectionNode(offset nodeOffset) (segmentCollectionNode, error) {
r, err := s.segment.newNodeReader(offset)
if err != nil {
return segmentCollectionNode{}, err
}
return ParseCollectionNode(r)
}
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