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 
  41     private CgroupInfo(String name, int hierarchyId, boolean enabled) {
  42         this.name = name;
  43         this.hierarchyId = hierarchyId;
  44         this.enabled = enabled;
  45     }
  46 
  47     String getName() {
  48         return name;
  49     }
  50 
  51     int getHierarchyId() {
  52         return hierarchyId;
  53     }
  54 
  55     boolean isEnabled() {
  56         return enabled;
  57     }
  58 
  59     static CgroupInfo fromCgroupsLine(String line) {
  60         String[] tokens = line.split("\\s+");
  61         if (tokens.length != 4) {
  62             return null;
  63         }
  64         // discard 3'rd field, num_cgroups
  65         return new CgroupInfo(tokens[0] /* name */,
  66                               Integer.parseInt(tokens[1]) /* hierarchyId */,
  67                               (Integer.parseInt(tokens[3]) == 1) /* enabled */);
  68     }
  69 
  70 }