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segments.go
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segments.go
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package index
import (
"strconv"
)
import (
"fmt"
// docu "github.com/gzg1984/golucene/core/document"
. "github.com/gzg1984/golucene/core/codec/spi"
. "github.com/gzg1984/golucene/core/index/model"
"github.com/gzg1984/golucene/core/store"
"github.com/gzg1984/golucene/core/util"
"sync/atomic"
)
// index/SegmentReader.java
/**
* IndexReader implementation over a single segment.
* <p>
* Instances pointing to the same segment (but with different deletes, etc)
* may share the same core data.
* @lucene.experimental
*/
type SegmentReader struct {
*AtomicReaderImpl
si *SegmentCommitInfo
liveDocs util.Bits
// Normally set to si.docCount - si.delDocCount, unless we
// were created as an NRT reader from IW, in which case IW
// tells us the docCount:
numDocs int
core *SegmentCoreReaders
fieldInfos FieldInfos
}
/**
* Constructs a new SegmentReader with a new core.
* @throws CorruptIndexException if the index is corrupt
* @throws IOException if there is a low-level IO error
*/
// TODO: why is this public?
func NewSegmentReader(si *SegmentCommitInfo,
termInfosIndexDivisor int, context store.IOContext) (r *SegmentReader, err error) {
r = &SegmentReader{}
r.AtomicReaderImpl = newAtomicReader(r)
r.ARFieldsReader = r
r.si = si
if r.fieldInfos, err = ReadFieldInfos(si); err != nil {
return nil, err
}
// log.Print("Obtaining SegmentCoreReaders...")
if r.core, err = newSegmentCoreReaders(r, si.Info.Dir, si, context, termInfosIndexDivisor); err != nil {
return nil, err
}
// r.segDocValues = newSegmentDocValues()
var success = false
defer func() {
// With lock-less commits, it's entirely possible (and
// fine) to hit a FileNotFound exception above. In
// this case, we want to explicitly close any subset
// of things that were opened so that we don't have to
// wait for a GC to do so.
if !success {
// log.Printf("Failed to initialize SegmentReader.")
r.core.decRef()
}
}()
codec := si.Info.Codec().(Codec)
if si.HasDeletions() {
panic("not supported yet")
} else {
assert(si.DelCount() == 0)
}
r.numDocs = si.Info.DocCount() - si.DelCount()
if r.fieldInfos.HasDocValues {
r.initDocValuesProducers(codec)
}
success = true
return r, nil
}
/* initialize the per-field DocValuesProducer */
func (r *SegmentReader) initDocValuesProducers(codec Codec) error {
// var dir store.Directory
// if r.core.cfsReader != nil {
// dir = r.core.cfsReader
// } else {
// dir = r.si.Info.Dir
// }
// dvFormat := codec.DocValuesFormat()
// termsIndexDivisor := r.core.termsIndexDivisor
if !r.si.HasFieldUpdates() {
panic("not implemented yet")
}
panic("not implemented yet")
}
/* Reads the most recent FieldInfos of the given segment info. */
func ReadFieldInfos(info *SegmentCommitInfo) (fis FieldInfos, err error) {
var dir store.Directory
var closeDir bool
if info.FieldInfosGen() == -1 && info.Info.IsCompoundFile() {
// no fieldInfos gen and segment uses a compound file
if dir, err = store.NewCompoundFileDirectory(info.Info.Dir,
util.SegmentFileName(info.Info.Name, "", store.COMPOUND_FILE_EXTENSION),
store.IO_CONTEXT_READONCE, false); err != nil {
return
}
closeDir = true
} else {
// gen'd FIS are read outside CFS, or the segment doesn't use a compound file
dir = info.Info.Dir
closeDir = false
}
defer func() {
if closeDir {
err = mergeError(err, dir.Close())
}
}()
var segmentSuffix string
if n := info.FieldInfosGen(); n != -1 {
segmentSuffix = strconv.FormatInt(n, 36)
}
codec := info.Info.Codec().(Codec)
fisFormat := codec.FieldInfosFormat()
return fisFormat.FieldInfosReader()(dir, info.Info.Name, segmentSuffix, store.IO_CONTEXT_READONCE)
}
func (r *SegmentReader) LiveDocs() util.Bits {
r.ensureOpen()
return r.liveDocs
}
func (r *SegmentReader) doClose() error {
panic("not implemented yet")
r.core.decRef()
return nil
}
func (r *SegmentReader) FieldInfos() FieldInfos {
r.ensureOpen()
return r.fieldInfos
}
// Expert: retrieve thread-private StoredFieldsReader
func (r *SegmentReader) FieldsReader() StoredFieldsReader {
r.ensureOpen()
return r.core.fieldsReaderLocal()
}
func (r *SegmentReader) VisitDocument(docID int, visitor StoredFieldVisitor) error {
r.checkBounds(docID)
return r.FieldsReader().VisitDocument(docID, visitor)
}
func (r *SegmentReader) Fields() Fields {
r.ensureOpen()
return r.core.fields
}
func (r *SegmentReader) NumDocs() int {
// Don't call ensureOpen() here (it could affect performance)
return r.numDocs
}
func (r *SegmentReader) MaxDoc() int {
// Don't call ensureOpen() here (it could affect performance)
return r.si.Info.DocCount()
}
func (r *SegmentReader) TermVectorsReader() TermVectorsReader {
panic("not implemented yet")
}
func (r *SegmentReader) TermVectors(docID int) (fs Fields, err error) {
panic("not implemented yet")
}
func (r *SegmentReader) checkBounds(docID int) {
if docID < 0 || docID >= r.MaxDoc() {
panic(fmt.Sprintf("docID must be >= 0 and < maxDoc=%v (got docID=%v)", r.MaxDoc(), docID))
}
}
// SegmentReader.java L179
func (r *SegmentReader) String() string {
// SegmentInfo.toString takes dir and number of
// *pending* deletions; so we reverse compute that here:
return r.si.StringOf(r.si.Info.Dir, r.si.Info.DocCount()-r.numDocs-r.si.DelCount())
}
func (r *SegmentReader) SegmentName() string {
return r.si.Info.Name
}
func (r *SegmentReader) SegmentInfos() *SegmentCommitInfo {
return r.si
}
func (r *SegmentReader) Directory() store.Directory {
// Don't ensureOpen here -- in certain cases, when a
// cloned/reopened reader needs to commit, it may call
// this method on the closed original reader
return r.si.Info.Dir
}
func (r *SegmentReader) CoreCacheKey() interface{} {
return r.core
}
func (r *SegmentReader) CombinedCoreAndDeletesKey() interface{} {
return r
}
func (r *SegmentReader) TermInfosIndexDivisor() int {
return r.core.termsIndexDivisor
}
func (r *SegmentReader) NumericDocValues(field string) (v NumericDocValues, err error) {
r.ensureOpen()
panic("not implemented yet")
}
func (r *SegmentReader) BinaryDocValues(field string) (v BinaryDocValues, err error) {
r.ensureOpen()
panic("not implemented yet")
}
func (r *SegmentReader) SortedDocValues(field string) (v SortedDocValues, err error) {
r.ensureOpen()
panic("not implemented yet")
}
func (r *SegmentReader) SortedSetDocValues(field string) (v SortedSetDocValues, err error) {
r.ensureOpen()
panic("not implemented yet")
}
func (r *SegmentReader) NormValues(field string) (v NumericDocValues, err error) {
r.ensureOpen()
return r.core.normValues(r.fieldInfos, field)
}
type CoreClosedListener interface {
onClose(r interface{})
}
// index/SegmentCoreReaders.java
type SegmentCoreReaders struct {
refCount int32 // synchronized
fields FieldsProducer
normsProducer DocValuesProducer
termsIndexDivisor int
owner *SegmentReader
fieldsReaderOrig StoredFieldsReader
termVectorsReaderOrig TermVectorsReader
cfsReader *store.CompoundFileDirectory
/*
Lucene Java use ThreadLocal to serve as thread-level cache, to avoid
expensive read actions while limit memory consumption. Since Go doesn't
have thread or routine Local, a new object is always returned.
TODO redesign when ported to goroutines
*/
fieldsReaderLocal func() StoredFieldsReader
normsLocal func() map[string]interface{}
addListener chan CoreClosedListener
removeListener chan CoreClosedListener
notifyListener chan bool
}
func newSegmentCoreReaders(owner *SegmentReader, dir store.Directory, si *SegmentCommitInfo,
context store.IOContext, termsIndexDivisor int) (self *SegmentCoreReaders, err error) {
assert2(termsIndexDivisor != 0,
"indexDivisor must be < 0 (don't load terms index) or greater than 0 (got 0)")
// fmt.Println("Initializing SegmentCoreReaders from directory:", dir)
self = &SegmentCoreReaders{
refCount: 1,
normsLocal: func() map[string]interface{} {
return make(map[string]interface{})
},
}
self.fieldsReaderLocal = func() StoredFieldsReader {
return self.fieldsReaderOrig.Clone()
}
// fmt.Println("Initializing listeners...")
self.addListener = make(chan CoreClosedListener)
self.removeListener = make(chan CoreClosedListener)
self.notifyListener = make(chan bool)
// TODO re-enable later
go func() { // ensure listners are synchronized
coreClosedListeners := make([]CoreClosedListener, 0)
isRunning := true
var listener CoreClosedListener
for isRunning {
// fmt.Println("Listening for events...")
select {
case listener = <-self.addListener:
coreClosedListeners = append(coreClosedListeners, listener)
case listener = <-self.removeListener:
n := len(coreClosedListeners)
for i, v := range coreClosedListeners {
if v == listener {
newListeners := make([]CoreClosedListener, 0, n-1)
newListeners = append(newListeners, coreClosedListeners[0:i]...)
newListeners = append(newListeners, coreClosedListeners[i+1:]...)
coreClosedListeners = newListeners
break
}
}
case <-self.notifyListener:
fmt.Println("Shutting down SegmentCoreReaders...")
isRunning = false
for _, v := range coreClosedListeners {
v.onClose(self)
}
}
}
fmt.Println("Listeners are done.")
}()
var success = false
ans := self
defer func() {
if !success {
fmt.Println("Failed to initialize SegmentCoreReaders.")
ans.decRef()
}
}()
codec := si.Info.Codec().(Codec)
// fmt.Println("Obtaining CFS Directory...")
var cfsDir store.Directory // confusing name: if (cfs) its the cfsdir, otherwise its the segment's directory.
if si.Info.IsCompoundFile() {
// fmt.Println("Detected CompoundFile.")
name := util.SegmentFileName(si.Info.Name, "", store.COMPOUND_FILE_EXTENSION)
if self.cfsReader, err = store.NewCompoundFileDirectory(dir, name, context, false); err != nil {
return nil, err
}
// fmt.Println("CompoundFileDirectory: ", self.cfsReader)
cfsDir = self.cfsReader
} else {
cfsDir = dir
}
// fmt.Println("CFS Directory:", cfsDir)
// fmt.Println("Reading FieldInfos...")
fieldInfos := owner.fieldInfos
self.termsIndexDivisor = termsIndexDivisor
format := codec.PostingsFormat()
// fmt.Println("Obtaining SegmentReadState...")
segmentReadState := NewSegmentReadState(cfsDir, si.Info, fieldInfos, context, termsIndexDivisor)
// Ask codec for its Fields
// fmt.Println("Obtaining FieldsProducer...")
if self.fields, err = format.FieldsProducer(segmentReadState); err != nil {
return nil, err
}
assert(self.fields != nil)
// ask codec for its Norms:
// TODO: since we don't write any norms file if there are no norms,
// kinda jaky to assume the codec handles the case of no norms file at all gracefully?!
if fieldInfos.HasNorms {
// fmt.Println("Obtaining NormsDocValuesProducer...")
if self.normsProducer, err = codec.NormsFormat().NormsProducer(segmentReadState); err != nil {
return nil, err
}
assert(self.normsProducer != nil)
}
// fmt.Println("Obtaining StoredFieldsReader...")
if self.fieldsReaderOrig, err = si.Info.Codec().(Codec).StoredFieldsFormat().FieldsReader(cfsDir, si.Info, fieldInfos, context); err != nil {
return nil, err
}
if fieldInfos.HasVectors { // open term vector files only as needed
// fmt.Println("Obtaining TermVectorsReader...")
if self.termVectorsReaderOrig, err = si.Info.Codec().(Codec).TermVectorsFormat().VectorsReader(cfsDir, si.Info, fieldInfos, context); err != nil {
return nil, err
}
}
// fmt.Println("Success")
success = true
return self, nil
}
func (r *SegmentCoreReaders) normValues(infos FieldInfos,
field string) (ndv NumericDocValues, err error) {
if norms, ok := r.normsLocal()[field]; ok {
ndv = norms.(NumericDocValues)
} else if fi := infos.FieldInfoByName(field); fi != nil && fi.HasNorms() {
assert(r.normsProducer != nil)
if ndv, err = r.normsProducer.Numeric(fi); err == nil {
r.normsLocal()[field] = norms
} // else Field does not exist
}
return
}
func (r *SegmentCoreReaders) decRef() {
if atomic.AddInt32(&r.refCount, -1) == 0 {
fmt.Println("--- closing core readers")
util.Close( /*self.termVectorsLocal, self.fieldsReaderLocal, r.normsLocal,*/
r.fields, r.termVectorsReaderOrig, r.fieldsReaderOrig,
r.cfsReader, r.normsProducer)
r.notifyListener <- true
}
}