/
snapshot_index_tfr.go
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/
snapshot_index_tfr.go
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// Copyright (c) 2017 Couchbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package scorch
import (
"bytes"
"context"
"fmt"
"reflect"
"sync/atomic"
"github.com/blevesearch/bleve/v2/search"
"github.com/blevesearch/bleve/v2/size"
index "github.com/blevesearch/bleve_index_api"
segment "github.com/blevesearch/scorch_segment_api/v2"
)
var reflectStaticSizeIndexSnapshotTermFieldReader int
func init() {
var istfr IndexSnapshotTermFieldReader
reflectStaticSizeIndexSnapshotTermFieldReader = int(reflect.TypeOf(istfr).Size())
}
type IndexSnapshotTermFieldReader struct {
term []byte
field string
snapshot *IndexSnapshot
dicts []segment.TermDictionary
postings []segment.PostingsList
iterators []segment.PostingsIterator
segmentOffset int
includeFreq bool
includeNorm bool
includeTermVectors bool
currPosting segment.Posting
currID index.IndexInternalID
recycle bool
bytesRead uint64
ctx context.Context
}
func (i *IndexSnapshotTermFieldReader) incrementBytesRead(val uint64) {
i.bytesRead += val
}
func (i *IndexSnapshotTermFieldReader) Size() int {
sizeInBytes := reflectStaticSizeIndexSnapshotTermFieldReader + size.SizeOfPtr +
len(i.term) +
len(i.field) +
len(i.currID)
for _, entry := range i.postings {
sizeInBytes += entry.Size()
}
for _, entry := range i.iterators {
sizeInBytes += entry.Size()
}
if i.currPosting != nil {
sizeInBytes += i.currPosting.Size()
}
return sizeInBytes
}
func (i *IndexSnapshotTermFieldReader) Next(preAlloced *index.TermFieldDoc) (*index.TermFieldDoc, error) {
rv := preAlloced
if rv == nil {
rv = &index.TermFieldDoc{}
}
// find the next hit
for i.segmentOffset < len(i.iterators) {
prevBytesRead := i.iterators[i.segmentOffset].BytesRead()
next, err := i.iterators[i.segmentOffset].Next()
if err != nil {
return nil, err
}
if next != nil {
// make segment number into global number by adding offset
globalOffset := i.snapshot.offsets[i.segmentOffset]
nnum := next.Number()
rv.ID = docNumberToBytes(rv.ID, nnum+globalOffset)
i.postingToTermFieldDoc(next, rv)
i.currID = rv.ID
i.currPosting = next
// postingsIterators is maintain the bytesRead stat in a cumulative fashion.
// this is because there are chances of having a series of loadChunk calls,
// and they have to be added together before sending the bytesRead at this point
// upstream.
bytesRead := i.iterators[i.segmentOffset].BytesRead()
if bytesRead > prevBytesRead {
i.incrementBytesRead(bytesRead - prevBytesRead)
}
return rv, nil
}
i.segmentOffset++
}
return nil, nil
}
func (i *IndexSnapshotTermFieldReader) postingToTermFieldDoc(next segment.Posting, rv *index.TermFieldDoc) {
if i.includeFreq {
rv.Freq = next.Frequency()
}
if i.includeNorm {
rv.Norm = next.Norm()
}
if i.includeTermVectors {
locs := next.Locations()
if cap(rv.Vectors) < len(locs) {
rv.Vectors = make([]*index.TermFieldVector, len(locs))
backing := make([]index.TermFieldVector, len(locs))
for i := range backing {
rv.Vectors[i] = &backing[i]
}
}
rv.Vectors = rv.Vectors[:len(locs)]
for i, loc := range locs {
*rv.Vectors[i] = index.TermFieldVector{
Start: loc.Start(),
End: loc.End(),
Pos: loc.Pos(),
ArrayPositions: loc.ArrayPositions(),
Field: loc.Field(),
}
}
}
}
func (i *IndexSnapshotTermFieldReader) Advance(ID index.IndexInternalID, preAlloced *index.TermFieldDoc) (*index.TermFieldDoc, error) {
// FIXME do something better
// for now, if we need to seek backwards, then restart from the beginning
if i.currPosting != nil && bytes.Compare(i.currID, ID) >= 0 {
i2, err := i.snapshot.TermFieldReader(nil, i.term, i.field,
i.includeFreq, i.includeNorm, i.includeTermVectors)
if err != nil {
return nil, err
}
// close the current term field reader before replacing it with a new one
_ = i.Close()
*i = *(i2.(*IndexSnapshotTermFieldReader))
}
num, err := docInternalToNumber(ID)
if err != nil {
return nil, fmt.Errorf("error converting to doc number % x - %v", ID, err)
}
segIndex, ldocNum := i.snapshot.segmentIndexAndLocalDocNumFromGlobal(num)
if segIndex >= len(i.snapshot.segment) {
return nil, fmt.Errorf("computed segment index %d out of bounds %d",
segIndex, len(i.snapshot.segment))
}
// skip directly to the target segment
i.segmentOffset = segIndex
next, err := i.iterators[i.segmentOffset].Advance(ldocNum)
if err != nil {
return nil, err
}
if next == nil {
// we jumped directly to the segment that should have contained it
// but it wasn't there, so reuse Next() which should correctly
// get the next hit after it (we moved i.segmentOffset)
return i.Next(preAlloced)
}
if preAlloced == nil {
preAlloced = &index.TermFieldDoc{}
}
preAlloced.ID = docNumberToBytes(preAlloced.ID, next.Number()+
i.snapshot.offsets[segIndex])
i.postingToTermFieldDoc(next, preAlloced)
i.currID = preAlloced.ID
i.currPosting = next
return preAlloced, nil
}
func (i *IndexSnapshotTermFieldReader) Count() uint64 {
var rv uint64
for _, posting := range i.postings {
rv += posting.Count()
}
return rv
}
func (i *IndexSnapshotTermFieldReader) Close() error {
if i.ctx != nil {
statsCallbackFn := i.ctx.Value(search.SearchIOStatsCallbackKey)
if statsCallbackFn != nil {
// essentially before you close the TFR, you must report this
// reader's bytesRead value
statsCallbackFn.(search.SearchIOStatsCallbackFunc)(i.bytesRead)
}
search.RecordSearchCost(i.ctx, search.AddM, i.bytesRead)
}
if i.snapshot != nil {
atomic.AddUint64(&i.snapshot.parent.stats.TotTermSearchersFinished, uint64(1))
i.snapshot.recycleTermFieldReader(i)
}
return nil
}