com.hazelcast.util

Class OperatingSystemMXBeanSupport

java.lang.Object

com.hazelcast.util.OperatingSystemMXBeanSupport

public final class OperatingSystemMXBeanSupport
extends Object

Support class for reading attributes from OperatingSystemMXBean.

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	GET_FREE_PHYSICAL_MEMORY_SIZE_DISABLED On AIX it can happen that the getFreePhysicalMemorySize method is very slow.

Method Summary

Modifier and Type	Method and Description
static double	getSystemLoadAverage() Reads the system load average attribute from OperatingSystemMXBean.
static long	readLongAttribute(String attributeName, long defaultValue) Reads a long attribute from OperatingSystemMXBean.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GET_FREE_PHYSICAL_MEMORY_SIZE_DISABLED

public static volatile boolean GET_FREE_PHYSICAL_MEMORY_SIZE_DISABLED

On AIX it can happen that the getFreePhysicalMemorySize method is very slow. This flags allows one to prevent executing this method and returns the default. This field is made volatile for testing purposes. Having this field volatile isn't relevant for performance since the logic for obtaining the attribute isn't very efficient.

Method Detail

readLongAttribute

public static long readLongAttribute(String attributeName,
                                     long defaultValue)

Reads a long attribute from OperatingSystemMXBean.

Parameters:

attributeName - name of the attribute

defaultValue - default value if the attribute value is null

Returns:

value of the attribute

getSystemLoadAverage

public static double getSystemLoadAverage()

Reads the system load average attribute from OperatingSystemMXBean.

Returns:

system load average or negative value if metric is not available