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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.monitor.os;
import org.apache.lucene.util.Constants;
import org.apache.lucene.util.SuppressForbidden;
import org.elasticsearch.common.io.PathUtils;
import org.elasticsearch.monitor.Probes;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.lang.reflect.Method;
import java.nio.file.Files;
import java.util.List;
public class OsProbe {
private static final OperatingSystemMXBean osMxBean = ManagementFactory.getOperatingSystemMXBean();
private static final Method getFreePhysicalMemorySize;
private static final Method getTotalPhysicalMemorySize;
private static final Method getFreeSwapSpaceSize;
private static final Method getTotalSwapSpaceSize;
private static final Method getSystemLoadAverage;
private static final Method getSystemCpuLoad;
static {
getFreePhysicalMemorySize = getMethod("getFreePhysicalMemorySize");
getTotalPhysicalMemorySize = getMethod("getTotalPhysicalMemorySize");
getFreeSwapSpaceSize = getMethod("getFreeSwapSpaceSize");
getTotalSwapSpaceSize = getMethod("getTotalSwapSpaceSize");
getSystemLoadAverage = getMethod("getSystemLoadAverage");
getSystemCpuLoad = getMethod("getSystemCpuLoad");
}
/**
* Returns the amount of free physical memory in bytes.
*/
public long getFreePhysicalMemorySize() {
if (getFreePhysicalMemorySize == null) {
return -1;
}
try {
return (long) getFreePhysicalMemorySize.invoke(osMxBean);
} catch (Throwable t) {
return -1;
}
}
/**
* Returns the total amount of physical memory in bytes.
*/
public long getTotalPhysicalMemorySize() {
if (getTotalPhysicalMemorySize == null) {
return -1;
}
try {
return (long) getTotalPhysicalMemorySize.invoke(osMxBean);
} catch (Throwable t) {
return -1;
}
}
/**
* Returns the amount of free swap space in bytes.
*/
public long getFreeSwapSpaceSize() {
if (getFreeSwapSpaceSize == null) {
return -1;
}
try {
return (long) getFreeSwapSpaceSize.invoke(osMxBean);
} catch (Throwable t) {
return -1;
}
}
/**
* Returns the total amount of swap space in bytes.
*/
public long getTotalSwapSpaceSize() {
if (getTotalSwapSpaceSize == null) {
return -1;
}
try {
return (long) getTotalSwapSpaceSize.invoke(osMxBean);
} catch (Throwable t) {
return -1;
}
}
/**
* Returns the system load averages
*/
public double[] getSystemLoadAverage() {
if (Constants.LINUX || Constants.FREE_BSD) {
final String procLoadAvg = Constants.LINUX ? "/proc/loadavg" : "/compat/linux/proc/loadavg";
double[] loadAverage = readProcLoadavg(procLoadAvg);
if (loadAverage != null) {
return loadAverage;
}
// fallback
}
if (getSystemLoadAverage == null) {
return null;
}
try {
double oneMinuteLoadAverage = (double) getSystemLoadAverage.invoke(osMxBean);
return new double[] { oneMinuteLoadAverage, -1, -1 };
} catch (Throwable t) {
return null;
}
}
@SuppressForbidden(reason = "access /proc")
private static double[] readProcLoadavg(String procLoadavg) {
try {
List<String> lines = Files.readAllLines(PathUtils.get(procLoadavg));
if (!lines.isEmpty()) {
String[] fields = lines.get(0).split("\\s+");
return new double[] { Double.parseDouble(fields[0]), Double.parseDouble(fields[1]), Double.parseDouble(fields[2]) };
}
} catch (IOException e) {
// do not fail Elasticsearch if something unexpected
// happens here
}
return null;
}
public short getSystemCpuPercent() {
return Probes.getLoadAndScaleToPercent(getSystemCpuLoad, osMxBean);
}
private static class OsProbeHolder {
private final static OsProbe INSTANCE = new OsProbe();
}
public static OsProbe getInstance() {
return OsProbeHolder.INSTANCE;
}
private OsProbe() {
}
public OsInfo osInfo() {
OsInfo info = new OsInfo();
info.availableProcessors = Runtime.getRuntime().availableProcessors();
info.name = Constants.OS_NAME;
info.arch = Constants.OS_ARCH;
info.version = Constants.OS_VERSION;
return info;
}
public OsStats osStats() {
OsStats stats = new OsStats();
stats.timestamp = System.currentTimeMillis();
stats.cpu = new OsStats.Cpu();
stats.cpu.percent = getSystemCpuPercent();
stats.cpu.loadAverage = getSystemLoadAverage();
OsStats.Mem mem = new OsStats.Mem();
mem.total = getTotalPhysicalMemorySize();
mem.free = getFreePhysicalMemorySize();
stats.mem = mem;
OsStats.Swap swap = new OsStats.Swap();
swap.total = getTotalSwapSpaceSize();
swap.free = getFreeSwapSpaceSize();
stats.swap = swap;
return stats;
}
/**
* Returns a given method of the OperatingSystemMXBean,
* or null if the method is not found or unavailable.
*/
private static Method getMethod(String methodName) {
try {
return Class.forName("com.sun.management.OperatingSystemMXBean").getMethod(methodName);
} catch (Throwable t) {
// not available
return null;
}
}
}
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