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/*
* 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.jvm;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;
import java.lang.reflect.Method;
public class SunThreadInfo {
private static final ThreadMXBean threadMXBean;
private static final Method getThreadAllocatedBytes;
private static final Method isThreadAllocatedMemorySupported;
private static final Method isThreadAllocatedMemoryEnabled;
private static final Logger logger = LogManager.getLogger(SunThreadInfo.class);
public static final SunThreadInfo INSTANCE = new SunThreadInfo();
static {
threadMXBean = ManagementFactory.getThreadMXBean();
getThreadAllocatedBytes = getMethod("getThreadAllocatedBytes", long.class);
isThreadAllocatedMemorySupported = getMethod("isThreadAllocatedMemorySupported");
isThreadAllocatedMemoryEnabled = getMethod("isThreadAllocatedMemoryEnabled");
}
public boolean isThreadAllocatedMemorySupported() {
if (isThreadAllocatedMemorySupported == null) {
return false;
}
try {
return (boolean) isThreadAllocatedMemorySupported.invoke(threadMXBean);
} catch (Exception e) {
logger.warn("exception while invoke isThreadAllocatedMemorySupported", e);
return false;
}
}
public boolean isThreadAllocatedMemoryEnabled() {
if (isThreadAllocatedMemoryEnabled == null) {
return false;
}
try {
return (boolean) isThreadAllocatedMemoryEnabled.invoke(threadMXBean);
} catch (Exception e) {
logger.warn("exception while invoke isThreadAllocatedMemoryEnabled", e);
return false;
}
}
public long getThreadAllocatedBytes(long id) {
if (getThreadAllocatedBytes == null) {
return 0;
}
if (isThreadAllocatedMemorySupported() == false || isThreadAllocatedMemoryEnabled() == false) {
return 0;
}
if (id <= 0) {
return 0;
}
try {
long bytes = (long) getThreadAllocatedBytes.invoke(threadMXBean, id);
assert bytes >= 0 : "OS reported a negative thread allocated size [" + bytes + "], thread id [" + id + "].";
return Math.max(0, bytes);
} catch (Exception e) {
logger.warn("exception retrieving thread allocated memory", e);
return 0;
}
}
private static Method getMethod(String methodName, Class... parameterTypes) {
try {
Method method = Class.forName("com.sun.management.ThreadMXBean").getMethod(methodName, parameterTypes);
return method;
} catch (Exception e) {
// not available
return null;
}
}
}