src/java.base/linux/classes/jdk/internal/platform/cgroupv1/SubSystem.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 package jdk.internal.platform.cgroupv1;

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.UncheckedIOException;
 import java.math.BigInteger;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.security.AccessController;
 import java.security.PrivilegedActionException;
 import java.security.PrivilegedExceptionAction;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 import java.util.function.Function;
 import java.util.stream.Stream;

 public class SubSystem {
     String root;
     String mountPoint;
     String path;

     public SubSystem(String root, String mountPoint) {
         this.root = root;
         this.mountPoint = mountPoint;
     }

     public void setPath(String cgroupPath) {
         if (root != null && cgroupPath != null) {
             if (root.equals("/")) {
                 if (!cgroupPath.equals("/")) {
                     path = mountPoint + cgroupPath;
                 }
                 else {
                     path = mountPoint;
                 }
             }
             else {
                 if (root.equals(cgroupPath)) {
                     path = mountPoint;
                 }
                 else {
                     if (cgroupPath.startsWith(root)) {
                         if (cgroupPath.length() > root.length()) {
                             String cgroupSubstr = cgroupPath.substring(root.length());
                             path = mountPoint + cgroupSubstr;
                         }
                     }
                 }
             }
         }
     }

     public String path() {
         return path;
     }

     /**
      * getSubSystemStringValue
      *
      * Return the first line of the file "parm" argument from the subsystem.
      *
      * TODO:  Consider using weak references for caching BufferedReader object.
      *
      * @param subsystem
      * @param parm
      * @return Returns the contents of the file specified by param.
      */
     public static String getStringValue(SubSystem subsystem, String parm) {
         if (subsystem == null) return null;

         try {
             return subsystem.readStringValue(parm);
         } catch (IOException e) {
             return null;
         }
     }

     private String readStringValue(String param) throws IOException {
         PrivilegedExceptionAction<BufferedReader> pea = () ->
                 Files.newBufferedReader(Paths.get(path(), param));
         try (BufferedReader bufferedReader =
                      AccessController.doPrivileged(pea)) {
             String line = bufferedReader.readLine();
             return line;
         } catch (PrivilegedActionException e) {
             Metrics.unwrapIOExceptionAndRethrow(e);
             throw new InternalError(e.getCause());
         } catch (UncheckedIOException e) {
             throw e.getCause();
         }
     }

     public static long getLongValueMatchingLine(SubSystem subsystem,
                                                      String param,
                                                      String match,
                                                      Function<String, Long> conversion) {
         long retval = Metrics.unlimited_minimum + 1; // default unlimited
         try {
             List<String> lines = subsystem.readMatchingLines(param);
             for (String line: lines) {
                 if (line.startsWith(match)) {
                     retval = conversion.apply(line);
                     break;
                 }
             }
         } catch (IOException e) {
             // Ignore. Default is unlimited.
         }
         return retval;
     }

     private List<String> readMatchingLines(String param) throws IOException {
         try {
             PrivilegedExceptionAction<List<String>> pea = () ->
                     Files.readAllLines(Paths.get(path(), param));
             return AccessController.doPrivileged(pea);
         } catch (PrivilegedActionException e) {
             Metrics.unwrapIOExceptionAndRethrow(e);
             throw new InternalError(e.getCause());
         } catch (UncheckedIOException e) {
             throw e.getCause();
         }
     }

     public static long getLongValue(SubSystem subsystem, String parm) {
         String strval = getStringValue(subsystem, parm);
         return convertStringToLong(strval);
     }

     public static long convertStringToLong(String strval) {
         long retval = 0;
         if (strval == null) return 0L;

         try {
             retval = Long.parseLong(strval);
         } catch (NumberFormatException e) {
             // For some properties (e.g. memory.limit_in_bytes) we may overflow the range of signed long.
             // In this case, return Long.MAX_VALUE
             BigInteger b = new BigInteger(strval);
             if (b.compareTo(BigInteger.valueOf(Long.MAX_VALUE)) > 0) {
                 return Long.MAX_VALUE;
             }
         }
         return retval;
     }

     public static double getDoubleValue(SubSystem subsystem, String parm) {
         String strval = getStringValue(subsystem, parm);

         if (strval == null) return 0L;

         double retval = Double.parseDouble(strval);

         return retval;
     }

     /**
      * getSubSystemlongEntry
      *
      * Return the long value from the line containing the string "entryname"
      * within file "parm" in the "subsystem".
      *
      * TODO:  Consider using weak references for caching BufferedReader object.
      *
      * @param subsystem
      * @param parm
      * @param entryname
      * @return long value
      */
     public static long getLongEntry(SubSystem subsystem, String parm, String entryname) {
         String val = null;

         if (subsystem == null) return 0L;

         try (Stream<String> lines = Metrics.readFilePrivileged(Paths.get(subsystem.path(), parm))) {

             Optional<String> result = lines.map(line -> line.split(" "))
                                            .filter(line -> (line.length == 2 &&
                                                    line[0].equals(entryname)))
                                            .map(line -> line[1])
                                            .findFirst();

             return result.isPresent() ? Long.parseLong(result.get()) : 0L;
         } catch (IOException e) {
             return 0L;
         } catch (UncheckedIOException e) {
             return 0L;
         }
     }

     public static int getIntValue(SubSystem subsystem, String parm) {
         String val = getStringValue(subsystem, parm);

         if (val == null) return 0;

         return Integer.parseInt(val);
     }

     /**
      * StringRangeToIntArray
      *
      * Convert a string in the form of  1,3-4,6 to an array of
      * integers containing all the numbers in the range.
      *
      * @param range
      * @return int[] containing a sorted list of processors or memory nodes
      */
     public static int[] StringRangeToIntArray(String range) {
         int[] ints = new int[0];

         if (range == null) return ints;

         ArrayList<Integer> results = new ArrayList<>();
         String strs[] = range.split(",");
         for (String str : strs) {
             if (str.contains("-")) {
                 String lohi[] = str.split("-");
                 // validate format
                 if (lohi.length != 2) {
                     continue;
                 }
                 int lo = Integer.parseInt(lohi[0]);
                 int hi = Integer.parseInt(lohi[1]);
                 for (int i = lo; i <= hi; i++) {
                     results.add(i);
                 }
             }
             else {
                 results.add(Integer.parseInt(str));
             }
         }

         // sort results
         results.sort(null);

         // convert ArrayList to primitive int array
         ints = new int[results.size()];
         int i = 0;
         for (Integer n : results) {
             ints[i++] = n;
         }

         return ints;
     }

     public static class MemorySubSystem extends SubSystem {

         private boolean hierarchical;
         private boolean swapenabled;

         public MemorySubSystem(String root, String mountPoint) {
             super(root, mountPoint);
         }

         boolean isHierarchical() {
             return hierarchical;
         }

         void setHierarchical(boolean hierarchical) {
             this.hierarchical = hierarchical;
         }

         boolean isSwapEnabled() {
             return swapenabled;
         }

         void setSwapEnabled(boolean swapenabled) {
             this.swapenabled = swapenabled;
         }

     }
 }
	/*
	* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package jdk.internal.platform.cgroupv1;

	import java.io.BufferedReader;
	import java.io.IOException;
	import java.io.UncheckedIOException;
	import java.math.BigInteger;
	import java.nio.file.Files;
	import java.nio.file.Paths;
	import java.security.AccessController;
	import java.security.PrivilegedActionException;
	import java.security.PrivilegedExceptionAction;
	import java.util.ArrayList;
	import java.util.List;
	import java.util.Optional;
	import java.util.function.Function;
	import java.util.stream.Stream;

	public class SubSystem {
	String root;
	String mountPoint;
	String path;

	public SubSystem(String root, String mountPoint) {
	this.root = root;
	this.mountPoint = mountPoint;
	}

	public void setPath(String cgroupPath) {
	if (root != null && cgroupPath != null) {
	if (root.equals("/")) {
	if (!cgroupPath.equals("/")) {
	path = mountPoint + cgroupPath;
	}
	else {
	path = mountPoint;
	}
	}
	else {
	if (root.equals(cgroupPath)) {
	path = mountPoint;
	}
	else {
	if (cgroupPath.startsWith(root)) {
	if (cgroupPath.length() > root.length()) {
	String cgroupSubstr = cgroupPath.substring(root.length());
	path = mountPoint + cgroupSubstr;
	}
	}
	}
	}
	}
	}

	public String path() {
	return path;
	}

	/**
	* getSubSystemStringValue
	*
	* Return the first line of the file "parm" argument from the subsystem.
	*
	* TODO: Consider using weak references for caching BufferedReader object.
	*
	* @param subsystem
	* @param parm
	* @return Returns the contents of the file specified by param.
	*/
	public static String getStringValue(SubSystem subsystem, String parm) {
	if (subsystem == null) return null;

	try {
	return subsystem.readStringValue(parm);
	} catch (IOException e) {
	return null;
	}
	}

	private String readStringValue(String param) throws IOException {
	PrivilegedExceptionAction<BufferedReader> pea = () ->
	Files.newBufferedReader(Paths.get(path(), param));
	try (BufferedReader bufferedReader =
	AccessController.doPrivileged(pea)) {
	String line = bufferedReader.readLine();
	return line;
	} catch (PrivilegedActionException e) {
	Metrics.unwrapIOExceptionAndRethrow(e);
	throw new InternalError(e.getCause());
	} catch (UncheckedIOException e) {
	throw e.getCause();
	}
	}

	public static long getLongValueMatchingLine(SubSystem subsystem,
	String param,
	String match,
	Function<String, Long> conversion) {
	long retval = Metrics.unlimited_minimum + 1; // default unlimited
	try {
	List<String> lines = subsystem.readMatchingLines(param);
	for (String line: lines) {
	if (line.startsWith(match)) {
	retval = conversion.apply(line);
	break;
	}
	}
	} catch (IOException e) {
	// Ignore. Default is unlimited.
	}
	return retval;
	}

	private List<String> readMatchingLines(String param) throws IOException {
	try {
	PrivilegedExceptionAction<List<String>> pea = () ->
	Files.readAllLines(Paths.get(path(), param));
	return AccessController.doPrivileged(pea);
	} catch (PrivilegedActionException e) {
	Metrics.unwrapIOExceptionAndRethrow(e);
	throw new InternalError(e.getCause());
	} catch (UncheckedIOException e) {
	throw e.getCause();
	}
	}

	public static long getLongValue(SubSystem subsystem, String parm) {
	String strval = getStringValue(subsystem, parm);
	return convertStringToLong(strval);
	}

	public static long convertStringToLong(String strval) {
	long retval = 0;
	if (strval == null) return 0L;

	try {
	retval = Long.parseLong(strval);
	} catch (NumberFormatException e) {
	// For some properties (e.g. memory.limit_in_bytes) we may overflow the range of signed long.
	// In this case, return Long.MAX_VALUE
	BigInteger b = new BigInteger(strval);
	if (b.compareTo(BigInteger.valueOf(Long.MAX_VALUE)) > 0) {
	return Long.MAX_VALUE;
	}
	}
	return retval;
	}

	public static double getDoubleValue(SubSystem subsystem, String parm) {
	String strval = getStringValue(subsystem, parm);

	if (strval == null) return 0L;

	double retval = Double.parseDouble(strval);

	return retval;
	}

	/**
	* getSubSystemlongEntry
	*
	* Return the long value from the line containing the string "entryname"
	* within file "parm" in the "subsystem".
	*
	* TODO: Consider using weak references for caching BufferedReader object.
	*
	* @param subsystem
	* @param parm
	* @param entryname
	* @return long value
	*/
	public static long getLongEntry(SubSystem subsystem, String parm, String entryname) {
	String val = null;

	if (subsystem == null) return 0L;

	try (Stream<String> lines = Metrics.readFilePrivileged(Paths.get(subsystem.path(), parm))) {

	Optional<String> result = lines.map(line -> line.split(" "))
	.filter(line -> (line.length == 2 &&
	line[0].equals(entryname)))
	.map(line -> line[1])
	.findFirst();

	return result.isPresent() ? Long.parseLong(result.get()) : 0L;
	} catch (IOException e) {
	return 0L;
	} catch (UncheckedIOException e) {
	return 0L;
	}
	}

	public static int getIntValue(SubSystem subsystem, String parm) {
	String val = getStringValue(subsystem, parm);

	if (val == null) return 0;

	return Integer.parseInt(val);
	}

	/**
	* StringRangeToIntArray
	*
	* Convert a string in the form of 1,3-4,6 to an array of
	* integers containing all the numbers in the range.
	*
	* @param range
	* @return int[] containing a sorted list of processors or memory nodes
	*/
	public static int[] StringRangeToIntArray(String range) {
	int[] ints = new int[0];

	if (range == null) return ints;

	ArrayList<Integer> results = new ArrayList<>();
	String strs[] = range.split(",");
	for (String str : strs) {
	if (str.contains("-")) {
	String lohi[] = str.split("-");
	// validate format
	if (lohi.length != 2) {
	continue;
	}
	int lo = Integer.parseInt(lohi[0]);
	int hi = Integer.parseInt(lohi[1]);
	for (int i = lo; i <= hi; i++) {
	results.add(i);
	}
	}
	else {
	results.add(Integer.parseInt(str));
	}
	}

	// sort results
	results.sort(null);

	// convert ArrayList to primitive int array
	ints = new int[results.size()];
	int i = 0;
	for (Integer n : results) {
	ints[i++] = n;
	}

	return ints;
	}

	public static class MemorySubSystem extends SubSystem {

	private boolean hierarchical;
	private boolean swapenabled;

	public MemorySubSystem(String root, String mountPoint) {
	super(root, mountPoint);
	}

	boolean isHierarchical() {
	return hierarchical;
	}

	void setHierarchical(boolean hierarchical) {
	this.hierarchical = hierarchical;
	}

	boolean isSwapEnabled() {
	return swapenabled;
	}

	void setSwapEnabled(boolean swapenabled) {
	this.swapenabled = swapenabled;
	}

	}
	}