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cursor_segment_collection_reusable.go
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cursor_segment_collection_reusable.go
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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: hello@weaviate.io
//
package lsmkv
import (
"github.com/weaviate/weaviate/entities/lsmkv"
)
type segmentCursorCollectionReusable struct {
segment *segment
nextOffset uint64
nodeBuf segmentCollectionNode
}
func (s *segment) newCollectionCursorReusable() *segmentCursorCollectionReusable {
return &segmentCursorCollectionReusable{
segment: s,
}
}
func (s *segmentCursorCollectionReusable) seek(key []byte) ([]byte, []value, error) {
node, err := s.segment.index.Seek(key)
if err != nil {
return nil, nil, err
}
err = s.parseCollectionNodeInto(nodeOffset{node.Start, node.End})
if err != nil {
return s.nodeBuf.primaryKey, nil, err
}
s.nextOffset = node.End
return s.nodeBuf.primaryKey, s.nodeBuf.values, nil
}
func (s *segmentCursorCollectionReusable) next() ([]byte, []value, error) {
if s.nextOffset >= s.segment.dataEndPos {
return nil, nil, lsmkv.NotFound
}
err := s.parseCollectionNodeInto(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(s.nodeBuf.offset)
if err != nil {
return s.nodeBuf.primaryKey, nil, err
}
return s.nodeBuf.primaryKey, s.nodeBuf.values, nil
}
func (s *segmentCursorCollectionReusable) first() ([]byte, []value, error) {
s.nextOffset = s.segment.dataStartPos
err := s.parseCollectionNodeInto(nodeOffset{start: s.nextOffset})
if err != nil {
return s.nodeBuf.primaryKey, nil, err
}
s.nextOffset = s.nextOffset + uint64(s.nodeBuf.offset)
return s.nodeBuf.primaryKey, s.nodeBuf.values, nil
}
func (s *segmentCursorCollectionReusable) parseCollectionNodeInto(offset nodeOffset) error {
r, err := s.segment.newNodeReader(offset)
if err != nil {
return err
}
return ParseCollectionNodeInto(r, &s.nodeBuf)
}