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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.monitor.process;
import org.elasticsearch.bootstrap.BootstrapInfo;
import org.elasticsearch.monitor.Probes;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.lang.reflect.Method;
import static org.elasticsearch.monitor.jvm.JvmInfo.jvmInfo;
public class ProcessProbe {
private static final OperatingSystemMXBean osMxBean = ManagementFactory.getOperatingSystemMXBean();
private static final Method getMaxFileDescriptorCountField;
private static final Method getOpenFileDescriptorCountField;
private static final Method getProcessCpuLoad;
private static final Method getProcessCpuTime;
private static final Method getCommittedVirtualMemorySize;
static {
getMaxFileDescriptorCountField = getUnixMethod("getMaxFileDescriptorCount");
getOpenFileDescriptorCountField = getUnixMethod("getOpenFileDescriptorCount");
getProcessCpuLoad = getMethod("getProcessCpuLoad");
getProcessCpuTime = getMethod("getProcessCpuTime");
getCommittedVirtualMemorySize = getMethod("getCommittedVirtualMemorySize");
}
private static class ProcessProbeHolder {
private static final ProcessProbe INSTANCE = new ProcessProbe();
}
public static ProcessProbe getInstance() {
return ProcessProbeHolder.INSTANCE;
}
private ProcessProbe() {}
/**
* Returns the maximum number of file descriptors allowed on the system, or -1 if not supported.
*/
public long getMaxFileDescriptorCount() {
if (getMaxFileDescriptorCountField == null) {
return -1;
}
try {
return (Long) getMaxFileDescriptorCountField.invoke(osMxBean);
} catch (Exception t) {
return -1;
}
}
/**
* Returns the number of opened file descriptors associated with the current process, or -1 if not supported.
*/
public long getOpenFileDescriptorCount() {
if (getOpenFileDescriptorCountField == null) {
return -1;
}
try {
return (Long) getOpenFileDescriptorCountField.invoke(osMxBean);
} catch (Exception t) {
return -1;
}
}
/**
* Returns the process CPU usage in percent
*/
public short getProcessCpuPercent() {
return Probes.getLoadAndScaleToPercent(getProcessCpuLoad, osMxBean);
}
/**
* Returns the CPU time (in milliseconds) used by the process on which the Java virtual machine is running, or -1 if not supported.
*/
public long getProcessCpuTotalTime() {
if (getProcessCpuTime != null) {
try {
long time = (long) getProcessCpuTime.invoke(osMxBean);
if (time >= 0) {
return (time / 1_000_000L);
}
} catch (Exception t) {
return -1;
}
}
return -1;
}
/**
* Returns the size (in bytes) of virtual memory that is guaranteed to be available to the running process
*/
public long getTotalVirtualMemorySize() {
if (getCommittedVirtualMemorySize != null) {
try {
long virtual = (long) getCommittedVirtualMemorySize.invoke(osMxBean);
if (virtual >= 0) {
return virtual;
}
} catch (Exception t) {
return -1;
}
}
return -1;
}
public ProcessInfo processInfo(long refreshInterval) {
return new ProcessInfo(jvmInfo().pid(), BootstrapInfo.isMemoryLocked(), refreshInterval);
}
public ProcessStats processStats() {
ProcessStats.Cpu cpu = new ProcessStats.Cpu(getProcessCpuPercent(), getProcessCpuTotalTime());
ProcessStats.Mem mem = new ProcessStats.Mem(getTotalVirtualMemorySize());
return new ProcessStats(System.currentTimeMillis(), getOpenFileDescriptorCount(), getMaxFileDescriptorCount(), cpu, mem);
}
/**
* 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 (Exception t) {
// not available
return null;
}
}
/**
* Returns a given method of the UnixOperatingSystemMXBean,
* or null if the method is not found or unavailable.
*/
private static Method getUnixMethod(String methodName) {
try {
return Class.forName("com.sun.management.UnixOperatingSystemMXBean").getMethod(methodName);
} catch (Exception t) {
// not available
return null;
}
}
}