Golang util.Close函数代码示例

/* Closes all resouces and writes the entry table */
func (w *CompoundFileWriter) Close() (err error) {
	if w.closed {
		fmt.Println("CompoundFileWriter is already closed.")
		return nil
	}

	// TODO this code should clean up after itself (remove partial .cfs/.cfe)
	if err = func() (err error) {
		var success = false
		defer func() {
			if success {
				util.Close(w.dataOut)
			} else {
				util.CloseWhileSuppressingError(w.dataOut)
			}
		}()

		assert2(w.pendingEntries.Len() == 0 && !w.outputTaken.Get(),
			"CFS has pending open files")
		w.closed = true
		// open the compound stream; we can safely use IO_CONTEXT_DEFAULT
		// here because this will only open the output if no file was
		// added to the CFS
		_, err = w.output(IO_CONTEXT_DEFAULT)
		if err != nil {
			return
		}
		assert(w.dataOut != nil)
		err = codec.WriteFooter(w.dataOut)
		if err != nil {
			return
		}
		success = true
		return nil
	}(); err != nil {
		return
	}

	var entryTableOut IndexOutput
	var success = false
	defer func() {
		if success {
			util.Close(entryTableOut)
		} else {
			util.CloseWhileSuppressingError(entryTableOut)
		}
	}()
	entryTableOut, err = w.directory.CreateOutput(w.entryTableName, IO_CONTEXT_DEFAULT)
	if err != nil {
		return
	}
	err = w.writeEntryTable(w.entries, entryTableOut)
	if err != nil {
		return
	}
	success = true
	return
}

func (w *PerFieldPostingsWriter) Close() error {
	var subs []io.Closer
	for _, v := range w.formats {
		subs = append(subs, v)
	}
	return util.Close(subs...)
}

func (r *CompressingTermVectorsReader) Close() (err error) {
	if !r.closed {
		err = util.Close(r.vectorsStream)
		r.closed = true
	}
	return err
}

func (w *CompressingStoredFieldsWriter) Close() error {
	defer func() {
		w.fieldsStream = nil
		w.indexWriter = nil
	}()
	return util.Close(w.fieldsStream, w.indexWriter)
}

/*
Copies the file src to 'to' under the new file name dest.

If you want to copy the entire source directory to the destination
one, you can do so like this:

		var to Directory // the directory to copy to
		for _, file := range dir.ListAll() {
			dir.Copy(to, file, newFile, IO_CONTEXT_DEFAULT)
			// newFile can be either file, or a new name
		}

NOTE: this method does not check whether dest exists and will
overwrite it if it does.
*/
func (d *DirectoryImpl) Copy(to Directory, src, dest string, ctx IOContext) (err error) {
	var os IndexOutput
	var is IndexInput
	var success = false
	defer func() {
		if success {
			err = util.Close(os, is)
		} else {
			util.CloseWhileSuppressingError(os, is)
		}
		defer func() {
			recover() // ignore panic
		}()
		to.DeleteFile(dest) // ignore error
	}()

	os, err = to.CreateOutput(dest, ctx)
	if err != nil {
		return err
	}
	is, err = d.spi.OpenInput(src, ctx)
	if err != nil {
		return err
	}
	err = os.CopyBytes(is, is.Length())
	if err != nil {
		return err
	}
	success = true
	return nil
}

func (w *Lucene41PostingsWriter) Close() (err error) {
	var success = false
	defer func() {
		if success {
			err = util.Close(w.docOut, w.posOut, w.payOut)
		} else {
			util.CloseWhileSuppressingError(w.docOut, w.posOut, w.payOut)
		}
		w.docOut = nil
		w.posOut = nil
		w.payOut = nil
	}()

	if err == nil && w.docOut != nil {
		err = codec.WriteFooter(w.docOut)
	}
	if err == nil && w.posOut != nil {
		err = codec.WriteFooter(w.posOut)
	}
	if err == nil && w.payOut != nil {
		err = codec.WriteFooter(w.payOut)
	}
	if err != nil {
		return
	}
	success = true
	return nil
}

func (tvc *TermVectorsConsumer) flush(fieldsToFlush map[string]TermsHashPerField,
	state *model.SegmentWriteState) (err error) {
	if tvc.writer != nil {
		numDocs := state.SegmentInfo.DocCount()
		assert(numDocs > 0)
		// At least one doc in this run had term vectors enabled
		func() {
			defer func() {
				err = mergeError(err, util.Close(tvc.writer))
				tvc.writer = nil
				tvc.lastDocId = 0
				tvc.hasVectors = false
			}()

			err = tvc.fill(numDocs)
			if err == nil {
				err = tvc.writer.Finish(state.FieldInfos, numDocs)
			}
		}()
		if err != nil {
			return err
		}
	}

	return
}

func (nc *NormsConsumer) Close() (err error) {
	var success = false
	defer func() {
		if success {
			err = util.Close(nc.data, nc.meta)
		} else {
			util.CloseWhileSuppressingError(nc.data, nc.meta)
		}
	}()

	if nc.meta != nil {
		if err = nc.meta.WriteVInt(-1); err != nil { // write EOF marker
			return
		}
		if err = codec.WriteFooter(nc.meta); err != nil { // write checksum
			return
		}
	}
	if nc.data != nil {
		if err = codec.WriteFooter(nc.data); err != nil { // write checksum
			return
		}
	}
	success = true
	return nil
}

// Close the underlying IndexInputs
func (r *CompressingStoredFieldsReader) Close() (err error) {
	if !r.closed {
		if err = util.Close(r.fieldsStream); err == nil {
			r.closed = true
		}
	}
	return
}

func (r *SegmentCoreReaders) decRef() {
	if atomic.AddInt32(&r.refCount, -1) == 0 {
		util.Close( /*self.termVectorsLocal, self.fieldsReaderLocal, docValuesLocal, r.normsLocal,*/
			r.fields, r.dvProducer, r.termVectorsReaderOrig, r.fieldsReaderOrig,
			r.cfsReader, r.normsProducer)
		r.notifyListener <- r.owner
	}
}

func (r *BlockTreeTermsReader) Close() error {
	defer func() {
		// Clear so refs to terms index is GCable even if
		// app hangs onto us:
		r.fields = make(map[string]FieldReader)
	}()
	return util.Close(r.in, r.postingsReader)
}

func (w *BlockTreeTermsWriter) Close() (err error) {
	var success = false
	defer func() {
		if success {
			util.Close(w.out, w.indexOut, w.postingsWriter)
		} else {
			util.CloseWhileSuppressingError(w.out, w.indexOut, w.postingsWriter)
		}
	}()

	dirStart := w.out.FilePointer()
	indexDirStart := w.indexOut.FilePointer()

	if err = w.out.WriteVInt(int32(len(w.fields))); err != nil {
		return
	}

	for _, field := range w.fields {
		// fmt.Printf("  field %v %v terms\n", field.fieldInfo.Name, field.numTerms)
		if err = w.out.WriteVInt(field.fieldInfo.Number); err == nil {
			assert(field.numTerms > 0)
			if err = w.out.WriteVLong(field.numTerms); err == nil {
				if err = w.out.WriteVInt(int32(len(field.rootCode))); err == nil {
					err = w.out.WriteBytes(field.rootCode)
					if err == nil && field.fieldInfo.IndexOptions() != INDEX_OPT_DOCS_ONLY {
						err = w.out.WriteVLong(field.sumTotalTermFreq)
					}
					if err == nil {
						if err = w.out.WriteVLong(field.sumDocFreq); err == nil {
							if err = w.out.WriteVInt(int32(field.docCount)); err == nil {
								if err = w.out.WriteVInt(int32(field.longsSize)); err == nil {
									if err = w.indexOut.WriteVLong(field.indexStartFP); err == nil {
										if err = writeBytesRef(w.out, field.minTerm); err == nil {
											err = writeBytesRef(w.out, field.maxTerm)
										}
									}
								}
							}
						}
					}
				}
			}
		}
	}
	if err == nil {
		if err = w.writeTrailer(w.out, dirStart); err == nil {
			if err = codec.WriteFooter(w.out); err == nil {
				if err = w.writeIndexTrailer(w.indexOut, indexDirStart); err == nil {
					if err = codec.WriteFooter(w.indexOut); err == nil {
						success = true
					}
				}
			}
		}
	}
	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
	}
}

func (w *CompressingStoredFieldsWriter) Close() error {
	assert(w != nil)
	defer func() {
		if w != nil {
			w.fieldsStream = nil
			w.indexWriter = nil
		}
	}()
	return util.Close(w.fieldsStream, w.indexWriter)
}

func (dvp *PerFieldDocValuesReader) Close() error {
	fps := make([]DocValuesProducer, 0)
	for _, v := range dvp.formats {
		fps = append(fps, v)
	}
	items := make([]io.Closer, len(fps))
	for i, v := range fps {
		items[i] = v
	}
	return util.Close(items...)
}