com.hazelcast.util.OperatingSystemMXBeanSupport Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.util;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.lang.reflect.Method;
/**
* Support class for reading attributes from OperatingSystemMXBean.
*/
public final class OperatingSystemMXBeanSupport {
private static final OperatingSystemMXBean OPERATING_SYSTEM_MX_BEAN = ManagementFactory.getOperatingSystemMXBean();
private static final double PERCENTAGE_MULTIPLIER = 100d;
private OperatingSystemMXBeanSupport() {
}
/**
* Reads a long attribute from OperatingSystemMXBean.
*
* @param attributeName name of the attribute
* @param defaultValue default value if the attribute value is null
* @return value of the attribute
*/
public static long readLongAttribute(String attributeName, long defaultValue) {
try {
String methodName = "get" + attributeName;
OperatingSystemMXBean systemMXBean = OPERATING_SYSTEM_MX_BEAN;
Method method = systemMXBean.getClass().getMethod(methodName);
method.setAccessible(true);
Object value = method.invoke(systemMXBean);
if (value == null) {
return defaultValue;
}
if (value instanceof Long) {
return (Long) value;
}
if (value instanceof Double) {
double v = (Double) value;
return Math.round(v * PERCENTAGE_MULTIPLIER);
}
if (value instanceof Number) {
return ((Number) value).longValue();
}
} catch (RuntimeException re) {
throw re;
} catch (Exception ignored) {
EmptyStatement.ignore(ignored);
}
return defaultValue;
}
/**
* Reads the system load average attribute from OperatingSystemMXBean.
*
* @return system load average or negative value if metric is not available
*/
public static double getSystemLoadAverage() {
return OPERATING_SYSTEM_MX_BEAN.getSystemLoadAverage();
}
}