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/**
* MIT License
*
* Copyright (c) 2010 - 2020 The OSHI Project Contributors: https://github.com/oshi/oshi/graphs/contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package oshi.driver.linux.proc;
import java.util.EnumMap;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import oshi.annotation.concurrent.ThreadSafe;
import oshi.util.FileUtil;
import oshi.util.ParseUtil;
import oshi.util.platform.linux.ProcPath;
/**
* Utility to read disk statistics from {@code /proc/diskstats}
*/
@ThreadSafe
public final class DiskStats {
/**
* Enum corresponding to the fields in the output of {@code /proc/diskstats}
*/
public enum IoStat {
/**
* The device major number.
*/
MAJOR,
/**
* The device minor number.
*/
MINOR,
/**
* The device name.
*/
NAME,
/**
* The total number of reads completed successfully.
*/
READS,
/**
* Reads which are adjacent to each other merged for efficiency.
*/
READS_MERGED,
/**
* The total number of sectors read successfully.
*/
READS_SECTOR,
/**
* The total number of milliseconds spent by all reads.
*/
READS_MS,
/**
* The total number of writes completed successfully.
*/
WRITES,
/**
* Writes which are adjacent to each other merged for efficiency.
*/
WRITES_MERGED,
/**
* The total number of sectors written successfully.
*/
WRITES_SECTOR,
/**
* The total number of milliseconds spent by all writes.
*/
WRITES_MS,
/**
* Incremented as requests are given to appropriate struct request_queue and
* decremented as they finish.
*/
IO_QUEUE_LENGTH,
/**
* The total number of milliseconds spent doing I/Os.
*/
IO_MS,
/**
* Incremented at each I/O start, I/O completion, I/O merge, or read of these
* stats by the number of I/Os in progress {@link #IO_QUEUE_LENGTH} times the
* number of milliseconds spent doing I/O since the last update of this field.
*/
IO_MS_WEIGHTED,
/**
* The total number of discards completed successfully.
*/
DISCARDS,
/**
* Discards which are adjacent to each other merged for efficiency.
*/
DISCARDS_MERGED,
/**
* The total number of sectors discarded successfully.
*/
DISCARDS_SECTOR,
/**
* The total number of milliseconds spent by all discards.
*/
DISCARDS_MS,
/**
* The total number of flush requests completed successfully.
*/
FLUSHES,
/**
* The total number of milliseconds spent by all flush requests.
*/
FLUSHES_MS;
}
private DiskStats() {
}
/**
* Reads the statistics in {@code /proc/diskstats} and returns the results.
*
* @return A map with each disk's name as the key, and an EnumMap as the value,
* where the numeric values in {@link IoStat} are mapped to a
* {@link Long} value.
*/
public static Map> getDiskStats() {
Map> diskStatMap = new HashMap<>();
IoStat[] enumArray = IoStat.class.getEnumConstants();
List diskStats = FileUtil.readFile(ProcPath.DISKSTATS);
for (String stat : diskStats) {
String[] split = ParseUtil.whitespaces.split(stat.trim());
Map statMap = new EnumMap<>(IoStat.class);
String name = null;
for (int i = 0; i < enumArray.length && i < split.length; i++) {
if (enumArray[i] == IoStat.NAME) {
name = split[i];
} else {
statMap.put(enumArray[i], ParseUtil.parseLongOrDefault(split[i], 0L));
}
}
if (name != null) {
diskStatMap.put(name, statMap);
}
}
return diskStatMap;
}
}
