| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.iotdb.confignode.procedure.store; |
| |
| import org.apache.iotdb.confignode.procedure.Procedure; |
| import org.apache.iotdb.tsfile.utils.PublicBAOS; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.DataOutputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.FileChannel; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.util.List; |
| |
| public class ProcedureWAL { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(ProcedureWAL.class); |
| |
| private static final String TMP_SUFFIX = ".tmp"; |
| private static final int PROCEDURE_WAL_BUFFER_SIZE = 8 * 1024 * 1024; |
| private IProcedureFactory procedureFactory; |
| private Path walFilePath; |
| |
| public ProcedureWAL(Path walFilePath, IProcedureFactory procedureFactory) { |
| this.walFilePath = walFilePath; |
| this.procedureFactory = procedureFactory; |
| } |
| |
| /** |
| * Create a wal file |
| * |
| * @throws IOException ioe |
| */ |
| public void save(Procedure procedure) throws IOException { |
| File walTmp = new File(walFilePath + TMP_SUFFIX); |
| Path walTmpPath = walTmp.toPath(); |
| Files.deleteIfExists(walTmpPath); |
| Files.createFile(walTmpPath); |
| try (FileOutputStream fos = new FileOutputStream(walTmp); |
| FileChannel channel = fos.getChannel(); |
| PublicBAOS publicBAOS = new PublicBAOS(); |
| DataOutputStream dataOutputStream = new DataOutputStream(publicBAOS)) { |
| procedure.serialize(dataOutputStream); |
| channel.write(ByteBuffer.wrap(publicBAOS.getBuf(), 0, publicBAOS.size())); |
| } |
| Files.deleteIfExists(walFilePath); |
| Files.move(walTmpPath, walFilePath); |
| } |
| |
| /** |
| * Load wal files into memory |
| * |
| * @param procedureList procedure list |
| */ |
| public void load(List<Procedure> procedureList) { |
| Procedure procedure = null; |
| try (FileInputStream fis = new FileInputStream(walFilePath.toFile()); |
| FileChannel channel = fis.getChannel()) { |
| ByteBuffer byteBuffer = ByteBuffer.allocate(PROCEDURE_WAL_BUFFER_SIZE); |
| if (channel.read(byteBuffer) > 0) { |
| byteBuffer.flip(); |
| procedure = procedureFactory.create(byteBuffer); |
| byteBuffer.clear(); |
| } |
| procedureList.add(procedure); |
| } catch (IOException e) { |
| LOG.error("Load {} failed, it will be deleted.", walFilePath, e); |
| walFilePath.toFile().delete(); |
| } |
| } |
| |
| public void delete() { |
| try { |
| Files.deleteIfExists(Paths.get(walFilePath + TMP_SUFFIX)); |
| Files.deleteIfExists(walFilePath); |
| } catch (IOException e) { |
| LOG.error("Delete procedure wal failed."); |
| } |
| } |
| } |