Golang IndexOutput.Close方法代碼示例

/*
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 (w *MockDirectoryWrapper) _crash() error {
	w.crashed = true
	w.openFiles = make(map[string]int)
	w.openFilesForWrite = make(map[string]bool)
	w.openFilesDeleted = make(map[string]bool)
	files := w.unSyncedFiles
	w.unSyncedFiles = make(map[string]bool)
	// first force-close all files, so we can corrupt on windows etc.
	// clone the file map, as these guys want to remove themselves on close.
	m := make(map[io.Closer]error)
	for k, v := range w.openFileHandles {
		m[k] = v
	}
	for f, _ := range m {
		f.Close() // ignore error
	}

	for name, _ := range files {
		var action string
		var err error
		switch w.randomState.Intn(5) {
		case 0:
			action = "deleted"
			err = w.deleteFile(name, true)
		case 1:
			action = "zeroes"
			// Zero out file entirely
			var length int64
			length, err = w.FileLength(name)
			if err == nil {
				zeroes := make([]byte, 256)
				var upto int64 = 0
				var out store.IndexOutput
				out, err = w.BaseDirectoryWrapperImpl.CreateOutput(name, NewDefaultIOContext(w.randomState))
				if err == nil {
					for upto < length && err == nil {
						limit := length - upto
						if int64(len(zeroes)) < limit {
							limit = int64(len(zeroes))
						}
						err = out.WriteBytes(zeroes[:limit])
						upto += limit
					}
					if err == nil {
						err = out.Close()
					}
				}
			}
		case 2:
			action = "partially truncated"
			// Partially Truncate the file:

			// First, make temp file and copy only half this file over:
			var tempFilename string
			for {
				tempFilename = fmt.Sprintf("%v", w.randomState.Int())
				if !w.BaseDirectoryWrapperImpl.FileExists(tempFilename) {
					break
				}
			}
			var tempOut store.IndexOutput
			if tempOut, err = w.BaseDirectoryWrapperImpl.CreateOutput(tempFilename, NewDefaultIOContext(w.randomState)); err == nil {
				var ii store.IndexInput
				if ii, err = w.BaseDirectoryWrapperImpl.OpenInput(name, NewDefaultIOContext(w.randomState)); err == nil {
					if err = tempOut.CopyBytes(ii, ii.Length()/2); err == nil {
						if err = tempOut.Close(); err == nil {
							if err = ii.Close(); err == nil {
								// Delete original and copy bytes back:
								if err = w.deleteFile(name, true); err == nil {
									var out store.IndexOutput
									if out, err = w.BaseDirectoryWrapperImpl.CreateOutput(name, NewDefaultIOContext(w.randomState)); err == nil {
										if ii, err = w.BaseDirectoryWrapperImpl.OpenInput(tempFilename, NewDefaultIOContext(w.randomState)); err == nil {
											if err = out.CopyBytes(ii, ii.Length()); err == nil {
												if err = out.Close(); err == nil {
													if err = ii.Close(); err == nil {
														err = w.deleteFile(tempFilename, true)
													}
												}
											}
										}
									}
								}
							}
						}
					}
				}
			}
		case 3:
			// the file survived intact:
			action = "didn't change"
		default:
			action = "fully truncated"
			// totally truncate the file to zero bytes
			if err = w.deleteFile(name, true); err == nil {
				var out store.IndexOutput
				if out, err = w.BaseDirectoryWrapperImpl.CreateOutput(name, NewDefaultIOContext(w.randomState)); err == nil {
					if err = out.SetLength(0); err == nil {
						err = out.Close()
					}
				}
//.........這裏部分代碼省略.........

	}
}

var Lucene46FieldInfosWriter = func(dir store.Directory,
	segName, suffix string, infos FieldInfos, ctx store.IOContext) (err error) {

	filename := util.SegmentFileName(segName, suffix, FI_EXTENSION)
	var output store.IndexOutput
	if output, err = dir.CreateOutput(filename, ctx); err != nil {
		return
	}

	var success = false
	defer func() {
		if success {
			err = output.Close()
		} else {
			util.CloseWhileSuppressingError(output)
		}
	}()

	if err = codec.WriteHeader(output, FI_CODEC_NAME, FI_FORMAT_CURRENT); err != nil {
		return
	}
	if err = output.WriteVInt(int32(infos.Size())); err != nil {
		return
	}
	for _, fi := range infos.Values {
		indexOptions := fi.IndexOptions()
		bits := byte(0)
		if fi.HasVectors() {