1 /*
   2  * Copyright (c) 2020, Red Hat Inc.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.internal.platform;
  27 
  28 /**
  29  * Data structure to hold info from /proc/self/cgroup
  30  *
  31  * man 7 cgroups
  32  *
  33  * @see CgroupSubsystemFactory
  34  */
  35 class CgroupInfo {
  36 
  37     private final String name;
  38     private final int hierarchyId;
  39     private final boolean enabled;
  40     private String cgroupPath;
  41 
  42     private CgroupInfo(String name, int hierarchyId, boolean enabled) {
  43         this.name = name;
  44         this.hierarchyId = hierarchyId;
  45         this.enabled = enabled;
  46     }
  47 
  48     String getName() {
  49         return name;
  50     }
  51 
  52     int getHierarchyId() {
  53         return hierarchyId;
  54     }
  55 
  56     boolean isEnabled() {
  57         return enabled;
  58     }
  59 
  60     String getCgroupPath() {
  61         return cgroupPath;
  62     }
  63 
  64     void setCgroupPath(String cgroupPath) {
  65         this.cgroupPath = cgroupPath;
  66     }
  67 
  68     static CgroupInfo fromCgroupsLine(String line) {
  69         String[] tokens = line.split("\\s+");
  70         if (tokens.length != 4) {
  71             return null;
  72         }
  73         // discard 3'rd field, num_cgroups
  74         return new CgroupInfo(tokens[0] /* name */,
  75                               Integer.parseInt(tokens[1]) /* hierarchyId */,
  76                               (Integer.parseInt(tokens[3]) == 1) /* enabled */);
  77     }
  78 
  79 }