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/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.internal.platform.cgroupv1;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.ArrayList;
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import java.util.Optional;
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import java.util.stream.Stream;
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public class SubSystem {
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String root;
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String mountPoint;
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String path;
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public SubSystem(String root, String mountPoint) {
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this.root = root;
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this.mountPoint = mountPoint;
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}
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public void setPath(String cgroupPath) {
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if (root != null && cgroupPath != null) {
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if (root.equals("/")) {
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if (cgroupPath.equals("/")) {
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path = mountPoint + cgroupPath;
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}
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else {
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path = mountPoint;
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}
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}
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else {
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if (root.equals(cgroupPath)) {
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path = mountPoint;
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}
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else {
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if (root.indexOf(cgroupPath) == 0) {
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if (cgroupPath.length() > root.length()) {
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String cgroupSubstr = cgroupPath.substring(root.length());
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path = mountPoint + cgroupSubstr;
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}
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}
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}
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}
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}
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}
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public String path() {
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return path;
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}
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/**
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* getSubSystemStringValue
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*
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* Return the first line of the file "parm" argument from the subsystem.
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*
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* TODO: Consider using weak references for caching BufferedReader object.
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*
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* @param subsystem
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* @param parm
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* @return Returns the contents of the file specified by param.
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*/
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public static String getStringValue(SubSystem subsystem, String parm) {
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if (subsystem == null) return null;
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try(BufferedReader bufferedReader = Files.newBufferedReader(Paths.get(subsystem.path(), parm))) {
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String line = bufferedReader.readLine();
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return line;
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}
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catch (IOException e) {
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return null;
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}
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}
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public static long getLongValue(SubSystem subsystem, String parm) {
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String strval = getStringValue(subsystem, parm);
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if (strval == null) return 0L;
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long retval = Long.parseLong(strval);
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return retval;
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}
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public static double getDoubleValue(SubSystem subsystem, String parm) {
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String strval = getStringValue(subsystem, parm);
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if (strval == null) return 0L;
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double retval = Double.parseDouble(strval);
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return retval;
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}
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/**
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* getSubSystemlongEntry
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*
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* Return the long value from the line containing the string "entryname"
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* within file "parm" in the "subsystem".
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*
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* TODO: Consider using weak references for caching BufferedReader object.
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*
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* @param subsystem
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* @param parm
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* @param entryname
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* @return long value
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*/
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public static long getLongEntry(SubSystem subsystem, String parm, String entryname) {
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String val = null;
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if (subsystem == null) return 0L;
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try (Stream<String> lines = Files.lines(Paths.get(subsystem.path(), parm))) {
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Optional<String> result = lines.map(line -> line.split(" "))
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.filter(line -> (line.length == 2 &&
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line[0].equals(entryname)))
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.map(line -> line[1])
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.findFirst();
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return result.isPresent() ? Long.parseLong(result.get()) : 0L;
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}
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catch (IOException e) {
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return 0L;
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}
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}
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public static int getIntValue(SubSystem subsystem, String parm) {
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String val = getStringValue(subsystem, parm);
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if (val == null) return 0;
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return Integer.parseInt(val);
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}
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/**
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* StringRangeToIntArray
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*
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* Convert a string in the form of 1,3-4,6 to an array of
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* integers containing all the numbers in the range.
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*
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* @param range
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* @return int[] containing a sorted list of processors or memory nodes
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*/
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public static int[] StringRangeToIntArray(String range) {
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int[] ints = new int[0];
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if (range == null) return ints;
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ArrayList<Integer> results = new ArrayList<>();
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String strs[] = range.split(",");
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for (String str : strs) {
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if (str.contains("-")) {
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String lohi[] = str.split("-");
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// validate format
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if (lohi.length != 2) {
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continue;
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}
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int lo = Integer.parseInt(lohi[0]);
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int hi = Integer.parseInt(lohi[1]);
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for (int i = lo; i <= hi; i++) {
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results.add(i);
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}
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}
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else {
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results.add(Integer.parseInt(str));
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}
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}
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// sort results
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results.sort(null);
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// convert ArrayList to primitive int array
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ints = new int[results.size()];
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int i = 0;
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for (Integer n : results) {
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ints[i++] = n;
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}
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return ints;
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}
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}
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