1 /*
   2  * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
   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.cgroupv1;
  27 
  28 import jdk.internal.platform.CgroupSubsystemController;
  29 import jdk.internal.platform.Metrics;
  30 
  31 public class CgroupV1SubsystemController implements CgroupSubsystemController {
  32 
  33     // Values returned larger than this number are unlimited.
  34     static long UNLIMITED_MIN = 0x7FFFFFFFFF000000L;
  35     String root;
  36     String mountPoint;
  37     String path;
  38 
  39     public CgroupV1SubsystemController(String root, String mountPoint) {
  40         this.root = root;
  41         this.mountPoint = mountPoint;
  42     }
  43 
  44     public void setPath(String cgroupPath) {
  45         if (root != null && cgroupPath != null) {
  46             if (root.equals("/")) {
  47                 if (!cgroupPath.equals("/")) {
  48                     path = mountPoint + cgroupPath;
  49                 }
  50                 else {
  51                     path = mountPoint;
  52                 }
  53             }
  54             else {
  55                 if (root.equals(cgroupPath)) {
  56                     path = mountPoint;
  57                 }
  58                 else {
  59                     if (cgroupPath.startsWith(root)) {
  60                         if (cgroupPath.length() > root.length()) {
  61                             String cgroupSubstr = cgroupPath.substring(root.length());
  62                             path = mountPoint + cgroupSubstr;
  63                         }
  64                     }
  65                 }
  66             }
  67         }
  68     }
  69 
  70     @Override
  71     public String path() {
  72         return path;
  73     }
  74 
  75     public static long convertStringToLong(String strval) {
  76         return CgroupSubsystemController.convertStringToLong(strval, Long.MAX_VALUE);
  77     }
  78 
  79     public static long longValOrUnlimited(long value) {
  80         return value > UNLIMITED_MIN ? Metrics.LONG_RETVAL_UNLIMITED : value;
  81     }
  82 }