| /** |
| * 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.BufferedReader; |
| import java.io.File; |
| import java.io.FileReader; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import org.apache.storm.utils.Utils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class CgroupCenter implements CgroupOperation { |
| |
| private static Logger LOG = LoggerFactory.getLogger(CgroupCenter.class); |
| |
| private static CgroupCenter instance; |
| |
| private CgroupCenter() { |
| |
| } |
| |
| public static synchronized CgroupCenter getInstance() { |
| if (CgroupUtils.enabled()) { |
| instance = new CgroupCenter(); |
| return instance; |
| } |
| return null; |
| } |
| |
| @Override |
| public List<Hierarchy> getHierarchies() { |
| Map<String, Hierarchy> hierarchies = new HashMap<String, Hierarchy>(); |
| try (FileReader reader = new FileReader(CgroupUtils.MOUNT_STATUS_FILE); |
| BufferedReader br = new BufferedReader(reader)) { |
| String str = null; |
| while ((str = br.readLine()) != null) { |
| String[] strSplit = str.split(" "); |
| if (!strSplit[2].equals("cgroup")) { |
| continue; |
| } |
| String name = strSplit[0]; |
| String type = strSplit[3]; |
| String dir = strSplit[1]; |
| //Some mount options (i.e. rw and relatime) in type are not cgroups related |
| Hierarchy h = new Hierarchy(name, CgroupUtils.getSubSystemsFromString(type), dir); |
| hierarchies.put(type, h); |
| } |
| return new ArrayList<Hierarchy>(hierarchies.values()); |
| } catch (Exception e) { |
| LOG.error("Get hierarchies error {}", e); |
| } |
| return null; |
| } |
| |
| @Override |
| public Set<SubSystem> getSubSystems() { |
| Set<SubSystem> subSystems = new HashSet<SubSystem>(); |
| try (FileReader reader = new FileReader(CgroupUtils.CGROUP_STATUS_FILE); |
| BufferedReader br = new BufferedReader(reader)) { |
| String str = null; |
| while ((str = br.readLine()) != null) { |
| String[] split = str.split("\t"); |
| SubSystemType type = SubSystemType.getSubSystem(split[0]); |
| if (type == null) { |
| continue; |
| } |
| int hierarchyId = Integer.valueOf(split[1]); |
| int cgroupNum = Integer.valueOf(split[2]); |
| boolean enable = Integer.valueOf(split[3]).intValue() == 1 ? true : false; |
| subSystems.add(new SubSystem(type, hierarchyId, cgroupNum, enable)); |
| } |
| return subSystems; |
| } catch (Exception e) { |
| LOG.error("Get subSystems error {}", e); |
| } |
| return null; |
| } |
| |
| @Override |
| public boolean isSubSystemEnabled(SubSystemType subSystemType) { |
| Set<SubSystem> subSystems = this.getSubSystems(); |
| for (SubSystem subSystem : subSystems) { |
| if (subSystem.getType() == subSystemType) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public Hierarchy getHierarchyWithSubSystem(SubSystemType subSystem) { |
| return getHierarchyWithSubSystems(Arrays.asList(subSystem)); |
| } |
| |
| @Override |
| public Hierarchy getHierarchyWithSubSystems(List<SubSystemType> subSystems) { |
| List<Hierarchy> hierarchies = this.getHierarchies(); |
| for (Hierarchy hierarchy : hierarchies) { |
| Hierarchy ret = hierarchy; |
| for (SubSystemType subSystem : subSystems) { |
| if (!hierarchy.getSubSystems().contains(subSystem)) { |
| ret = null; |
| break; |
| } |
| } |
| if (ret != null) { |
| return ret; |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| public boolean isMounted(Hierarchy hierarchy) { |
| if (Utils.checkDirExists(hierarchy.getDir())) { |
| List<Hierarchy> hierarchies = this.getHierarchies(); |
| for (Hierarchy h : hierarchies) { |
| if (h.equals(hierarchy)) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public void mount(Hierarchy hierarchy) throws IOException { |
| if (this.isMounted(hierarchy)) { |
| LOG.error("{} is already mounted", hierarchy.getDir()); |
| return; |
| } |
| Set<SubSystemType> subSystems = hierarchy.getSubSystems(); |
| for (SubSystemType type : subSystems) { |
| Hierarchy hierarchyWithSubSystem = this.getHierarchyWithSubSystem(type); |
| if (hierarchyWithSubSystem != null) { |
| LOG.error("subSystem: {} is already mounted on hierarchy: {}", type.name(), hierarchyWithSubSystem); |
| subSystems.remove(type); |
| } |
| } |
| if (subSystems.size() == 0) { |
| return; |
| } |
| if (!Utils.checkDirExists(hierarchy.getDir())) { |
| new File(hierarchy.getDir()).mkdirs(); |
| } |
| String subSystemsName = CgroupUtils.subSystemsToString(subSystems); |
| SystemOperation.mount(subSystemsName, hierarchy.getDir(), "cgroup", subSystemsName); |
| |
| } |
| |
| @Override |
| public void umount(Hierarchy hierarchy) throws IOException { |
| if (this.isMounted(hierarchy)) { |
| hierarchy.getRootCgroups().delete(); |
| SystemOperation.umount(hierarchy.getDir()); |
| CgroupUtils.deleteDir(hierarchy.getDir()); |
| } else { |
| LOG.error("{} is not mounted", hierarchy.getDir()); |
| } |
| } |
| |
| @Override |
| public void createCgroup(CgroupCommon cgroup) throws SecurityException { |
| if (cgroup.isRoot()) { |
| LOG.error("You can't create rootCgroup in this function"); |
| throw new RuntimeException("You can't create rootCgroup in this function"); |
| } |
| CgroupCommon parent = cgroup.getParent(); |
| while (parent != null) { |
| if (!Utils.checkDirExists(parent.getDir())) { |
| throw new RuntimeException("Parent " + parent.getDir() + "does not exist"); |
| } |
| parent = parent.getParent(); |
| } |
| Hierarchy h = cgroup.getHierarchy(); |
| if (!isMounted(h)) { |
| throw new RuntimeException("hierarchy " + h.getDir() + " is not mounted"); |
| } |
| if (Utils.checkDirExists(cgroup.getDir())) { |
| throw new RuntimeException("cgroup {} already exists " + cgroup.getDir()); |
| } |
| |
| if (!(new File(cgroup.getDir())).mkdir()) { |
| throw new RuntimeException("Could not create cgroup dir at " + cgroup.getDir()); |
| } |
| } |
| |
| @Override |
| public void deleteCgroup(CgroupCommon cgroup) throws IOException { |
| cgroup.delete(); |
| } |
| } |