198ca1ad4d
In the index/store package introduce KVReader creates snapshot all read operations consistent from this snapshot must close to release introduce KVWriter only one writer active access to all operations allows for consisten read-modify-write must close to release introduce AssociativeMerge operation on batch allows efficient read-modify-write for associative operations used to consolidate updates to the term summary rows saves 1 set and 1 get op per shared instance of term in field In the index package introduced an IndexReader exposes a consisten snapshot of the index for searching At top level All searches now operate on a consisten snapshot of the index
173 lines
4.4 KiB
Go
173 lines
4.4 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package upside_down
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import (
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"bytes"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/index/store"
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)
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type UpsideDownCouchTermFieldReader struct {
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indexReader *IndexReader
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iterator store.KVIterator
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count uint64
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term []byte
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field uint16
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}
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func newUpsideDownCouchTermFieldReader(indexReader *IndexReader, term []byte, field uint16) (*UpsideDownCouchTermFieldReader, error) {
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tfr := NewTermFrequencyRow(term, field, "", 0, 0)
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it := indexReader.kvreader.Iterator(tfr.Key())
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var count uint64
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key, val, valid := it.Current()
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if valid {
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if bytes.Equal(key, tfr.Key()) {
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tfr, err := NewTermFrequencyRowKV(key, val)
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if err != nil {
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return nil, err
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}
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count = tfr.freq
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}
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}
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return &UpsideDownCouchTermFieldReader{
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indexReader: indexReader,
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iterator: it,
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count: count,
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term: term,
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field: field,
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}, nil
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}
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func (r *UpsideDownCouchTermFieldReader) Count() uint64 {
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return r.count
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}
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func (r *UpsideDownCouchTermFieldReader) Next() (*index.TermFieldDoc, error) {
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r.iterator.Next()
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key, val, valid := r.iterator.Current()
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if valid {
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testfr := NewTermFrequencyRow(r.term, r.field, "", 0, 0)
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if !bytes.HasPrefix(key, testfr.Key()) {
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// end of the line
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return nil, nil
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}
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tfr, err := NewTermFrequencyRowKV(key, val)
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if err != nil {
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return nil, err
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}
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return &index.TermFieldDoc{
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ID: string(tfr.doc),
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Freq: tfr.freq,
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Norm: float64(tfr.norm),
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Vectors: r.indexReader.index.termFieldVectorsFromTermVectors(tfr.vectors),
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}, nil
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}
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return nil, nil
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}
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func (r *UpsideDownCouchTermFieldReader) Advance(docID string) (*index.TermFieldDoc, error) {
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tfr := NewTermFrequencyRow(r.term, r.field, docID, 0, 0)
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r.iterator.Seek(tfr.Key())
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key, val, valid := r.iterator.Current()
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if valid {
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testfr := NewTermFrequencyRow(r.term, r.field, "", 0, 0)
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if !bytes.HasPrefix(key, testfr.Key()) {
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// end of the line
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return nil, nil
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}
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tfr, err := NewTermFrequencyRowKV(key, val)
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if err != nil {
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return nil, err
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}
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return &index.TermFieldDoc{
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ID: string(tfr.doc),
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Freq: tfr.freq,
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Norm: float64(tfr.norm),
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Vectors: r.indexReader.index.termFieldVectorsFromTermVectors(tfr.vectors),
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}, nil
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}
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return nil, nil
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}
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func (r *UpsideDownCouchTermFieldReader) Close() {
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r.iterator.Close()
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}
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type UpsideDownCouchDocIDReader struct {
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indexReader *IndexReader
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iterator store.KVIterator
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start string
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end string
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}
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func newUpsideDownCouchDocIDReader(indexReader *IndexReader, start, end string) (*UpsideDownCouchDocIDReader, error) {
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if start == "" {
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start = string([]byte{0x0})
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}
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if end == "" {
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end = string([]byte{0xff})
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}
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bisr := NewBackIndexRow(start, nil, nil)
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it := indexReader.kvreader.Iterator(bisr.Key())
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return &UpsideDownCouchDocIDReader{
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indexReader: indexReader,
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iterator: it,
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start: start,
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end: end,
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}, nil
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}
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func (r *UpsideDownCouchDocIDReader) Next() (string, error) {
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key, val, valid := r.iterator.Current()
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if valid {
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bier := NewBackIndexRow(r.end, nil, nil)
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if bytes.Compare(key, bier.Key()) > 0 {
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// end of the line
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return "", nil
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}
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br, err := NewBackIndexRowKV(key, val)
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if err != nil {
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return "", err
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}
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r.iterator.Next()
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return string(br.doc), nil
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}
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return "", nil
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}
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func (r *UpsideDownCouchDocIDReader) Advance(docID string) (string, error) {
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bir := NewBackIndexRow(docID, nil, nil)
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r.iterator.Seek(bir.Key())
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key, val, valid := r.iterator.Current()
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if valid {
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bier := NewBackIndexRow(r.end, nil, nil)
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if bytes.Compare(key, bier.Key()) > 0 {
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// end of the line
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return "", nil
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}
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br, err := NewBackIndexRowKV(key, val)
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if err != nil {
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return "", err
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}
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r.iterator.Next()
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return string(br.doc), nil
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}
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return "", nil
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}
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func (r *UpsideDownCouchDocIDReader) Close() {
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r.iterator.Close()
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}
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