| /* |
| * 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.db.storageengine.rescon.disk; |
| |
| import org.apache.iotdb.commons.exception.ConfigurationException; |
| import org.apache.iotdb.commons.utils.ProcessIdUtils; |
| import org.apache.iotdb.tsfile.utils.FSUtils; |
| |
| import org.apache.commons.io.FileUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.nio.channels.FileChannel; |
| import java.nio.channels.FileLock; |
| import java.nio.channels.OverlappingFileLockException; |
| import java.nio.file.FileStore; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class DirectoryChecker { |
| private static final Logger logger = LoggerFactory.getLogger(DirectoryChecker.class); |
| private static final String LOCK_FILE_NAME = ".iotdb-lock"; |
| private final List<RandomAccessFile> randomAccessFileList = new ArrayList<>(); |
| private final List<File> fileList = new ArrayList<>(); |
| |
| private DirectoryChecker() {} |
| |
| public static DirectoryChecker getInstance() { |
| return DirectoryCheckerHolder.INSTANCE; |
| } |
| |
| public void registerDirectory(File dir) throws ConfigurationException, IOException { |
| if (dir.exists() && !dir.isDirectory()) { |
| throw new ConfigurationException( |
| String.format( |
| "Unable to create directory %s because there is file under the path, please check configuration and restart.", |
| dir.getAbsolutePath())); |
| } else if (!dir.exists()) { |
| if (!dir.mkdirs()) { |
| throw new ConfigurationException( |
| String.format( |
| "Unable to create directory %s, please check configuration and restart.", |
| dir.getAbsolutePath())); |
| } |
| } |
| File file = new File(dir, LOCK_FILE_NAME); |
| RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw"); |
| FileChannel channel = randomAccessFile.getChannel(); |
| FileLock lock = null; |
| try { |
| // Try acquiring the lock without blocking. This method returns |
| // null or throws an exception if the file is already locked. |
| lock = channel.tryLock(); |
| } catch (OverlappingFileLockException e) { |
| // File is already locked in this thread or virtual machine |
| } |
| // File is already locked other virtual machine |
| if (lock == null) { |
| throw new ConfigurationException( |
| String.format( |
| "Conflict is detected in directory %s, which may be being used by another IoTDB (ProcessId=%s). Please check configuration and restart.", |
| dir.getAbsolutePath(), randomAccessFile.readLine())); |
| } |
| randomAccessFile.writeBytes(ProcessIdUtils.getProcessId()); |
| // add to list |
| fileList.add(file); |
| randomAccessFileList.add(randomAccessFile); |
| } |
| |
| public boolean isCrossDisk(String[] dirs) throws IOException { |
| if (dirs.length < 2) { |
| return false; |
| } |
| Path root = mountOf(new File(dirs[0]).toPath()); |
| for (int i = 1; i < dirs.length; i++) { |
| // cross storage media |
| if (!FSUtils.isLocal(dirs[i])) { |
| return true; |
| } |
| Path path = mountOf(new File(dirs[i]).toPath()); |
| if (!path.equals(root)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private Path mountOf(Path p) throws IOException { |
| FileStore fs = Files.getFileStore(p); |
| Path temp = p.toAbsolutePath(); |
| Path mountp = temp; |
| while ((temp = temp.getParent()) != null && fs.equals(Files.getFileStore(temp))) { |
| mountp = temp; |
| } |
| return mountp; |
| } |
| |
| public void deregisterAll() { |
| try { |
| for (RandomAccessFile randomAccessFile : randomAccessFileList) { |
| randomAccessFile.close(); |
| // it will release lock automatically after close |
| } |
| for (File file : fileList) { |
| FileUtils.delete(file); |
| } |
| } catch (IOException e) { |
| logger.warn("Failed to deregister file lock because {}", e.getMessage(), e); |
| } |
| } |
| |
| private static class DirectoryCheckerHolder { |
| private static final DirectoryChecker INSTANCE = new DirectoryChecker(); |
| |
| private DirectoryCheckerHolder() {} |
| } |
| } |