24a2b57e29
the motivation for this commit is long and detailed and has been documented externally here: https://gist.github.com/mschoch/5cc5c9cf4669a5fe8512cb7770d3c1a2 the core of the changes are: 1. recognize that collector/searcher need only a fixed number of DocumentMatch instances, and this number can be determined from the structure of the query, not the size of the data 2. knowing this, instances can be allocated in bulk, up front and they can be reused without locking (since all search operations take place in a single goroutine 3. combined with previous commits which enabled reuse of the IndexInternalID []byte, this allows for no allocation/copy of these bytes as well (by using DocumentMatch Reset() method when returning entries to the pool
223 lines
5.6 KiB
Go
223 lines
5.6 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 searchers
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import (
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"math"
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"sort"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/search"
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"github.com/blevesearch/bleve/search/scorers"
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)
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type ConjunctionSearcher struct {
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initialized bool
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indexReader index.IndexReader
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searchers OrderedSearcherList
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explain bool
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queryNorm float64
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currs []*search.DocumentMatch
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currentID index.IndexInternalID
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scorer *scorers.ConjunctionQueryScorer
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}
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func NewConjunctionSearcher(indexReader index.IndexReader, qsearchers []search.Searcher, explain bool) (*ConjunctionSearcher, error) {
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// build the downstream searchers
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searchers := make(OrderedSearcherList, len(qsearchers))
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for i, searcher := range qsearchers {
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searchers[i] = searcher
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}
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// sort the searchers
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sort.Sort(searchers)
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// build our searcher
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rv := ConjunctionSearcher{
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indexReader: indexReader,
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explain: explain,
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searchers: searchers,
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currs: make([]*search.DocumentMatch, len(searchers)),
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scorer: scorers.NewConjunctionQueryScorer(explain),
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}
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rv.computeQueryNorm()
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return &rv, nil
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}
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func (s *ConjunctionSearcher) computeQueryNorm() {
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// first calculate sum of squared weights
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sumOfSquaredWeights := 0.0
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for _, termSearcher := range s.searchers {
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sumOfSquaredWeights += termSearcher.Weight()
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}
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// now compute query norm from this
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s.queryNorm = 1.0 / math.Sqrt(sumOfSquaredWeights)
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// finally tell all the downstream searchers the norm
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for _, termSearcher := range s.searchers {
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termSearcher.SetQueryNorm(s.queryNorm)
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}
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}
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func (s *ConjunctionSearcher) initSearchers(ctx *search.SearchContext) error {
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var err error
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// get all searchers pointing at their first match
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for i, termSearcher := range s.searchers {
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if s.currs[i] != nil {
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ctx.DocumentMatchPool.Put(s.currs[i])
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}
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s.currs[i], err = termSearcher.Next(ctx)
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if err != nil {
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return err
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}
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}
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if len(s.currs) > 0 {
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if s.currs[0] != nil {
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s.currentID = s.currs[0].IndexInternalID
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} else {
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s.currentID = nil
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}
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}
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s.initialized = true
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return nil
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}
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func (s *ConjunctionSearcher) Weight() float64 {
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var rv float64
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for _, searcher := range s.searchers {
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rv += searcher.Weight()
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}
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return rv
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}
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func (s *ConjunctionSearcher) SetQueryNorm(qnorm float64) {
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for _, searcher := range s.searchers {
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searcher.SetQueryNorm(qnorm)
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}
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}
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func (s *ConjunctionSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {
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if !s.initialized {
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err := s.initSearchers(ctx)
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if err != nil {
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return nil, err
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}
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}
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var rv *search.DocumentMatch
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var err error
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OUTER:
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for s.currentID != nil {
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for i, termSearcher := range s.searchers {
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if s.currs[i] != nil && !s.currs[i].IndexInternalID.Equals(s.currentID) {
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if s.currentID.Compare(s.currs[i].IndexInternalID) < 0 {
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s.currentID = s.currs[i].IndexInternalID
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continue OUTER
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}
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// this reader doesn't have the currentID, try to advance
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if s.currs[i] != nil {
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ctx.DocumentMatchPool.Put(s.currs[i])
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}
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s.currs[i], err = termSearcher.Advance(ctx, s.currentID)
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if err != nil {
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return nil, err
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}
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if s.currs[i] == nil {
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s.currentID = nil
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continue OUTER
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}
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if !s.currs[i].IndexInternalID.Equals(s.currentID) {
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// we just advanced, so it doesn't match, it must be greater
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// no need to call next
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s.currentID = s.currs[i].IndexInternalID
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continue OUTER
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}
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} else if s.currs[i] == nil {
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s.currentID = nil
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continue OUTER
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}
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}
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// if we get here, a doc matched all readers, sum the score and add it
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rv = s.scorer.Score(ctx, s.currs)
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// we know all the searchers are pointing at the same thing
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// so they all need to be advanced
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for i, termSearcher := range s.searchers {
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if s.currs[i] != rv {
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ctx.DocumentMatchPool.Put(s.currs[i])
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}
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s.currs[i], err = termSearcher.Next(ctx)
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if err != nil {
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return nil, err
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}
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}
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if s.currs[0] == nil {
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s.currentID = nil
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} else {
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s.currentID = s.currs[0].IndexInternalID
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}
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// don't continue now, wait for the next call to Next()
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break
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}
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return rv, nil
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}
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func (s *ConjunctionSearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {
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if !s.initialized {
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err := s.initSearchers(ctx)
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if err != nil {
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return nil, err
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}
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}
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var err error
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for i, searcher := range s.searchers {
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if s.currs[i] != nil {
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ctx.DocumentMatchPool.Put(s.currs[i])
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}
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s.currs[i], err = searcher.Advance(ctx, ID)
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if err != nil {
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return nil, err
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}
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}
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s.currentID = ID
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return s.Next(ctx)
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}
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func (s *ConjunctionSearcher) Count() uint64 {
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// for now return a worst case
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var sum uint64
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for _, searcher := range s.searchers {
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sum += searcher.Count()
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}
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return sum
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}
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func (s *ConjunctionSearcher) Close() error {
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for _, searcher := range s.searchers {
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err := searcher.Close()
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (s *ConjunctionSearcher) Min() int {
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return 0
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}
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func (s *ConjunctionSearcher) DocumentMatchPoolSize() int {
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rv := len(s.currs)
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for _, s := range s.searchers {
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rv += s.DocumentMatchPoolSize()
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}
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return rv
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}
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