Golang Directory.CreateOutput方法代码示例

/*
A utility for writing the SEGMENTS_GEN file to a Directory.

NOTE: this is an internal utility which is kept public so that it's
accessible by code from other packages. You should avoid calling this
method unless you're absolutely sure what you're doing!
*/
func writeSegmentsGen(dir store.Directory, generation int64) {
	if err := func() (err error) {
		var genOutput store.IndexOutput
		genOutput, err = dir.CreateOutput(INDEX_FILENAME_SEGMENTS_GEN, store.IO_CONTEXT_READONCE)
		if err != nil {
			return err
		}

		defer func() {
			err = mergeError(err, genOutput.Close())
			err = mergeError(err, dir.Sync([]string{INDEX_FILENAME_SEGMENTS_GEN}))
		}()

		if err = genOutput.WriteInt(FORMAT_SEGMENTS_GEN_CURRENT); err == nil {
			if err = genOutput.WriteLong(generation); err == nil {
				if err = genOutput.WriteLong(generation); err == nil {
					err = codec.WriteFooter(genOutput)
				}
			}
		}
		return err
	}(); err != nil {
		// It's OK if we fail to write this file since it's used only as
		// one of the retry fallbacks.
		dir.DeleteFile(INDEX_FILENAME_SEGMENTS_GEN)
		// Ignore error; this file is only used in a retry fallback on init
	}
}

/*
Writes this vector to the file name in Directory d, in a format that
can be read by the constructor BitVector(Directory, String, IOContext)
*/
func (bv *BitVector) Write(d store.Directory, name string, ctx store.IOContext) (err error) {
	assert(reflect.TypeOf(d).Name() != "CompoundFileDirectory")
	var output store.IndexOutput
	if output, err = d.CreateOutput(name, ctx); err != nil {
		return err
	}
	defer func() {
		err = mergeError(err, output.Close())
	}()

	if err = output.WriteInt(-2); err != nil {
		return err
	}
	if err = codec.WriteHeader(output, CODEC, BV_VERSION_CURRENT); err != nil {
		return err
	}
	if bv.isSparse() {
		// sparse bit-set more efficiently saved as d-gaps.
		err = bv.writeClearedDgaps(output)
	} else {
		err = bv.writeBits(output)
	}
	if err != nil {
		return err
	}
	if err = codec.WriteFooter(output); err != nil {
		return err
	}
	bv.assertCount()
	return nil
}

func (w *Lucene40SegmentInfoWriter) Write(dir store.Directory,
	si *SegmentInfo, fis FieldInfos, ctx store.IOContext) (err error) {

	filename := util.SegmentFileName(si.Name, "", LUCENE40_SI_EXTENSION)
	si.AddFile(filename)

	var output store.IndexOutput
	output, err = dir.CreateOutput(filename, ctx)
	if err != nil {
		return err
	}

	var success = false
	defer func() {
		if !success {
			util.CloseWhileSuppressingError(output)
			si.Dir.DeleteFile(filename) // ignore error
		} else {
			err = mergeError(err, output.Close())
		}
	}()

	err = codec.WriteHeader(output, LUCENE40_CODEC_NAME, LUCENE40_VERSION_CURRENT)
	if err != nil {
		return err
	}
	// Write the Lucene version that created this segment, since 3.1
	err = store.Stream(output).WriteString(si.Version().String()).
		WriteInt(int32(si.DocCount())).
		WriteByte(func() byte {
			if si.IsCompoundFile() {
				return SEGMENT_INFO_YES
			}
			return byte((SEGMENT_INFO_NO + 256) % 256) // Go byte is non-negative, unlike Java
		}()).WriteStringStringMap(si.Diagnostics()).
		WriteStringStringMap(map[string]string{}).
		WriteStringSet(si.Files()).Close()
	if err != nil {
		return err
	}

	success = true
	return nil
}

func (sis *SegmentInfos) write(directory store.Directory) (err error) {
	segmentsFilename := sis.nextSegmentFilename()

	// Always advance the generation on write:
	if sis.generation == -1 {
		sis.generation = 1
	} else {
		sis.generation++
	}

	var segnOutput store.IndexOutput
	var success = false
	// var upgradedSIFiles = make(map[string]bool)

	defer func() {
		if !success {
			// We hit an error above; try to close the file but suppress
			// any errors
			util.CloseWhileSuppressingError(segnOutput)

			// for filename, _ := range upgradedSIFiles {
			// 	directory.DeleteFile(filename) // ignore error
			// }

			// Try not to leave a truncated segments_N fle in the index:
			directory.DeleteFile(segmentsFilename) // ignore error
		}
	}()

	if segnOutput, err = directory.CreateOutput(segmentsFilename, store.IO_CONTEXT_DEFAULT); err != nil {
		return
	}
	if err = codec.WriteHeader(segnOutput, "segments", VERSION_49); err != nil {
		return
	}
	if err = segnOutput.WriteLong(sis.version); err == nil {
		if err = segnOutput.WriteInt(int32(sis.counter)); err == nil {
			err = segnOutput.WriteInt(int32(len(sis.Segments)))
		}
	}
	if err != nil {
		return
	}
	for _, siPerCommit := range sis.Segments {
		si := siPerCommit.Info
		if err = segnOutput.WriteString(si.Name); err == nil {
			if err = segnOutput.WriteString(si.Codec().(Codec).Name()); err == nil {
				if err = segnOutput.WriteLong(siPerCommit.DelGen()); err == nil {
					assert2(siPerCommit.DelCount() >= 0 && siPerCommit.DelCount() <= si.DocCount(),
						"cannot write segment: invalid docCount segment=%v docCount=%v delCount=%v",
						si.Name, si.DocCount(), siPerCommit.DelCount())
					if err = segnOutput.WriteInt(int32(siPerCommit.DelCount())); err == nil {
						if err = segnOutput.WriteLong(siPerCommit.FieldInfosGen()); err == nil {
							if err = segnOutput.WriteLong(siPerCommit.DocValuesGen()); err == nil {
								if err = segnOutput.WriteStringSet(siPerCommit.FieldInfosFiles()); err == nil {
									dvUpdatesFiles := siPerCommit.DocValuesUpdatesFiles()
									if err = segnOutput.WriteInt(int32(len(dvUpdatesFiles))); err == nil {
										for k, v := range dvUpdatesFiles {
											if err = segnOutput.WriteInt(int32(k)); err != nil {
												break
											}
											if err = segnOutput.WriteStringSet(v); err != nil {
												break
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
		if err != nil {
			return
		}
		assert(si.Dir == directory)

		// If this segment is pre-4.x, perform a one-time "upgrade" to
		// write the .si file for it:
		if version := si.Version(); len(version) == 0 || !version.OnOrAfter(util.VERSION_4_0) {
			panic("not implemented yet")
		}
	}
	if err = segnOutput.WriteStringStringMap(sis.userData); err != nil {
		return
	}
	sis.pendingSegnOutput = segnOutput
	success = true
	return nil
}

func NewCompressingStoredFieldsWriter(dir store.Directory, si *model.SegmentInfo,
	segmentSuffix string, ctx store.IOContext, formatName string,
	compressionMode CompressionMode, chunkSize int) (*CompressingStoredFieldsWriter, error) {

	assert(dir != nil)
	ans := &CompressingStoredFieldsWriter{
		directory:       dir,
		segment:         si.Name,
		segmentSuffix:   segmentSuffix,
		compressionMode: compressionMode,
		compressor:      compressionMode.NewCompressor(),
		chunkSize:       chunkSize,
		docBase:         0,
		bufferedDocs:    newGrowableByteArrayDataOutput(chunkSize),
		numStoredFields: make([]int, 16),
		endOffsets:      make([]int, 16),
		numBufferedDocs: 0,
	}

	var success = false
	indexStream, err := dir.CreateOutput(util.SegmentFileName(si.Name, segmentSuffix,
		lucene40.FIELDS_INDEX_EXTENSION), ctx)
	if err != nil {
		return nil, err
	}
	assert(indexStream != nil)
	defer func() {
		if !success {
			util.CloseWhileSuppressingError(indexStream)
			ans.Abort()
		}
	}()

	ans.fieldsStream, err = dir.CreateOutput(util.SegmentFileName(si.Name, segmentSuffix,
		lucene40.FIELDS_EXTENSION), ctx)
	if err != nil {
		return nil, err
	}

	codecNameIdx := formatName + CODEC_SFX_IDX
	codecNameDat := formatName + CODEC_SFX_DAT
	err = codec.WriteHeader(indexStream, codecNameIdx, VERSION_CURRENT)
	if err != nil {
		return nil, err
	}
	err = codec.WriteHeader(ans.fieldsStream, codecNameDat, VERSION_CURRENT)
	if err != nil {
		return nil, err
	}
	assert(int64(codec.HeaderLength(codecNameIdx)) == indexStream.FilePointer())
	assert(int64(codec.HeaderLength(codecNameDat)) == ans.fieldsStream.FilePointer())

	ans.indexWriter, err = NewStoredFieldsIndexWriter(indexStream)
	if err != nil {
		return nil, err
	}
	assert(ans.indexWriter != nil)
	indexStream = nil

	err = ans.fieldsStream.WriteVInt(int32(chunkSize))
	if err != nil {
		return nil, err
	}
	err = ans.fieldsStream.WriteVInt(packed.VERSION_CURRENT)
	if err != nil {
		return nil, err
	}

	success = true
	return ans, nil
}

func (sis *SegmentInfos) write(directory store.Directory) error {
	segmentsFilename := sis.nextSegmentFilename()

	// Always advance the generation on write:
	if sis.generation == -1 {
		sis.generation = 1
	} else {
		sis.generation++
	}

	var segnOutput *store.ChecksumIndexOutput
	var success = false
	var upgradedSIFiles = make(map[string]bool)

	defer func() {
		if !success {
			// We hit an error above; try to close the file but suppress
			// any errors
			util.CloseWhileSuppressingError(segnOutput)

			for filename, _ := range upgradedSIFiles {
				directory.DeleteFile(filename) // ignore error
			}

			// Try not to leave a truncated segments_N fle in the index:
			directory.DeleteFile(segmentsFilename) // ignore error
		}
	}()

	out, err := directory.CreateOutput(segmentsFilename, store.IO_CONTEXT_DEFAULT)
	if err != nil {
		return err
	}
	segnOutput = store.NewChecksumIndexOutput(out)
	err = codec.WriteHeader(segnOutput, "segments", VERSION_40)
	if err != nil {
		return err
	}
	err = segnOutput.WriteLong(sis.version)
	if err == nil {
		err = segnOutput.WriteInt(int32(sis.counter))
		if err == nil {
			err = segnOutput.WriteInt(int32(len(sis.Segments)))
		}
	}
	if err != nil {
		return err
	}
	for _, siPerCommit := range sis.Segments {
		si := siPerCommit.info
		err = segnOutput.WriteString(si.Name)
		if err == nil {
			err = segnOutput.WriteString(si.Codec().(Codec).Name())
			if err == nil {
				err = segnOutput.WriteLong(siPerCommit.delGen)
				if err == nil {
					err = segnOutput.WriteInt(int32(siPerCommit.delCount))
				}
			}
		}
		if err != nil {
			return err
		}
		assert(si.Dir == directory)

		assert(siPerCommit.delCount <= si.DocCount())

		// If this segment is pre-4.x, perform a one-time "upgrade" to
		// write the .si file for it:
		if version := si.Version(); version == "" || versionLess(version, "4.0") {
			panic("not implemented yet")
		}
	}
	err = segnOutput.WriteStringStringMap(sis.userData)
	if err != nil {
		return err
	}
	sis.pendingSegnOutput = segnOutput
	success = true
	return nil
}