| /** |
| * 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.storm.container.cgroup; |
| |
| import java.io.BufferedWriter; |
| import java.io.File; |
| import java.io.FileWriter; |
| import java.io.IOException; |
| import java.nio.charset.Charset; |
| import java.util.Arrays; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| import org.apache.storm.shade.com.google.common.io.Files; |
| import org.apache.storm.utils.Utils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class CgroupUtils { |
| |
| public static final String CGROUP_STATUS_FILE = "/proc/cgroups"; |
| public static final String MOUNT_STATUS_FILE = "/proc/mounts"; |
| |
| private static final Logger LOG = LoggerFactory.getLogger(CgroupUtils.class); |
| |
| public static void deleteDir(String dir) { |
| File d = new File(dir); |
| if (!d.exists()) { |
| LOG.warn("dir {} does not exist!", dir); |
| return; |
| } |
| if (!d.isDirectory()) { |
| throw new RuntimeException("dir " + dir + " is not a directory!"); |
| } |
| if (!d.delete()) { |
| throw new RuntimeException("Cannot delete dir " + dir); |
| } |
| } |
| |
| /** |
| * Get a set of SubSystemType objects from a comma delimited list of subsystem names. |
| */ |
| public static Set<SubSystemType> getSubSystemsFromString(String str) { |
| Set<SubSystemType> result = new HashSet<SubSystemType>(); |
| String[] subSystems = str.split(","); |
| for (String subSystem : subSystems) { |
| //return null to mount options in string that is not part of cgroups |
| SubSystemType type = SubSystemType.getSubSystem(subSystem); |
| if (type != null) { |
| result.add(type); |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * Get a string that is a comma delimited list of subsystems. |
| */ |
| public static String subSystemsToString(Set<SubSystemType> subSystems) { |
| StringBuilder sb = new StringBuilder(); |
| if (subSystems.size() == 0) { |
| return sb.toString(); |
| } |
| for (SubSystemType type : subSystems) { |
| sb.append(type.name()).append(","); |
| } |
| return sb.toString().substring(0, sb.length() - 1); |
| } |
| |
| public static boolean enabled() { |
| return Utils.checkFileExists(CGROUP_STATUS_FILE); |
| } |
| |
| public static List<String> readFileByLine(String filePath) throws IOException { |
| return Files.readLines(new File(filePath), Charset.defaultCharset()); |
| } |
| |
| public static void writeFileByLine(String filePath, List<String> linesToWrite) throws IOException { |
| LOG.debug("For CGroups - writing {} to {} ", linesToWrite, filePath); |
| File file = new File(filePath); |
| if (!file.exists()) { |
| LOG.error("{} does not exist", filePath); |
| return; |
| } |
| try (FileWriter writer = new FileWriter(file, true); |
| BufferedWriter bw = new BufferedWriter(writer)) { |
| for (String string : linesToWrite) { |
| bw.write(string); |
| bw.newLine(); |
| bw.flush(); |
| } |
| } |
| } |
| |
| public static void writeFileByLine(String filePath, String lineToWrite) throws IOException { |
| writeFileByLine(filePath, Arrays.asList(lineToWrite)); |
| } |
| |
| public static String getDir(String dir, String constant) { |
| return dir + constant; |
| } |
| } |