content: /**
   * 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 com.alibaba.jstorm.container;
  
  import java.io.BufferedReader;
  import java.io.BufferedWriter;
  import java.io.File;
  import java.io.FileReader;
  import java.io.FileWriter;
  import java.io.IOException;
  import java.util.*;
  
  import com.alibaba.jstorm.utils.JStormUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.alibaba.jstorm.utils.SystemOperation;
  
  public class CgroupUtils {
      private static final Logger LOG = LoggerFactory.getLogger(CgroupUtils.class);
  
      public static void deleteDir(String dir) {
          try {
              String cmd = "rmdir " + dir;
              SystemOperation.exec(cmd);
          } catch (IOException e) {
              LOG.error("rm " + dir + " fail!", e);
          }
      }
  
      public static boolean fileExists(String dir) {
          File file = new File(dir);
          return file.exists();
      }
  
      public static boolean dirExists(String dir) {
          File file = new File(dir);
          return file.isDirectory();
      }
  
      public static Set<SubSystemType> analyse(String str) {
          Set<SubSystemType> result = new HashSet<>();
          String[] subSystems = str.split(",");
          for (String subSystem : subSystems) {
              SubSystemType type = SubSystemType.getSubSystem(subSystem);
              if (type != null)
                  result.add(type);
          }
          return result;
      }
  
      public static String reAnalyse(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 CgroupUtils.fileExists(Constants.CGROUP_STATUS_FILE);
      }
  
      public static List<String> readFileByLine(String fileDir) throws IOException {
          List<String> result = new ArrayList<>();
          FileReader fileReader = null;
          BufferedReader reader = null;
          try {
              File file = new File(fileDir);
              fileReader = new FileReader(file);
              reader = new BufferedReader(fileReader);
              String tempString;
              while ((tempString = reader.readLine()) != null) {
                  result.add(tempString);
              }
          } finally {
              CgroupUtils.close(fileReader, reader);
          }
          return result;
      }
  
      public static void writeFileByLine(String fileDir, List<String> strings) throws IOException {
          FileWriter writer = null;
          BufferedWriter bw = null;
          try {
              File file = new File(fileDir);
              if (!file.exists()) {
                  LOG.error(fileDir + " is no existed");
                  return;
              }
              writer = new FileWriter(file, true);
              bw = new BufferedWriter(writer);
              for (String string : strings) {
                  bw.write(string);
                  bw.newLine();
                  bw.flush();
              }
          } finally {
              CgroupUtils.close(writer, bw);
          }
      }
  
      public static void writeFileByLine(String fileDir, String string) throws IOException {
          FileWriter writer = null;
          BufferedWriter bw = null;
          try {
              File file = new File(fileDir);
              if (!file.exists()) {
                  LOG.error(fileDir + " is no existed");
                  return;
              }
              writer = new FileWriter(file, true);
              bw = new BufferedWriter(writer);
              bw.write(string);
              bw.newLine();
              bw.flush();
  
          } finally {
              CgroupUtils.close(writer, bw);
          }
      }
  
      public static void close(FileReader reader, BufferedReader br) {
          try {
              if (reader != null)
                  reader.close();
              if (br != null)
                  br.close();
          } catch (IOException ignored) {
          }
      }
  
      public static void close(FileWriter writer, BufferedWriter bw) {
          try {
              if (writer != null)
                  writer.close();
              if (bw != null)
                  bw.close();
          } catch (IOException ignored) {
          }
      }
  
      public static void sleep(long s) {
          try {
              Thread.sleep(s);
          } catch (InterruptedException ignored) {
          }
      }
  }
  