Package org.jppf.utils

Class ManagementUtils

java.lang.Object

org.jppf.utils.ManagementUtils

public class ManagementUtils
extends Object

Author:

Laurent Cohen

Constructor Summary

Constructors

Constructor	Description
ManagementUtils()

Method Summary

Modifier and Type	Method	Description
static Object	getAttribute(MBeanServerConnection connection, String mbeanName, String attributeName)	Get the given attribute of the given mbean via the specified mbean server connection.
static MBeanServer	getPlatformServer()	Get the platform MBean server.
static long	getThreadCpuTime(long threadID)	Determien the CPU time for the specified thread.
static long	getThreadUserTime(long threadID)	Determien the user time for the specified thread.
static boolean	isCpuTimeEnabled()	Whether CPU time measurement is enabled/supported.
static boolean	isManagementAvailable()	Determine whether management is available for the current JVM.
static boolean	isMBeanRegistered(String mbeanName)	Determine whether the MBean with the specified is already registered.
static boolean	isMBeanRegistered(String mbeanName, MBeanServer server)	Determine whether the MBean with the specified is already registered.

Methods inherited from class java.lang.Object

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

Constructor Details

ManagementUtils

public ManagementUtils()

Method Details

getAttribute

public static Object getAttribute(MBeanServerConnection connection,
 String mbeanName,
 String attributeName)
                           throws Exception

Get the given attribute of the given mbean via the specified mbean server connection.

Parameters:

connection - the mbean server connection to use.

mbeanName - the name of the mbean on which to invoke an attribute.

attributeName - the name of the attribute to get.

Returns:

the value of the attrribute, or null if management is not available.

Throws:

Exception - if any error occurs.

isManagementAvailable

public static boolean isManagementAvailable()

Determine whether management is available for the current JVM.

Returns:

true if management is available, false otherwise.

getPlatformServer

public static MBeanServer getPlatformServer()

Get the platform MBean server.

Returns:

a MBeanServerObject.

isMBeanRegistered

public static boolean isMBeanRegistered(String mbeanName)
                                 throws Exception

Determine whether the MBean with the specified is already registered.

Parameters:

mbeanName - the name of the MBean to check.

Returns:

true if the MBean is registered, false otherwise.

Throws:

Exception - if any error occurs.

isMBeanRegistered

public static boolean isMBeanRegistered(String mbeanName,
 MBeanServer server)
                                 throws Exception

Determine whether the MBean with the specified is already registered.

Parameters:

mbeanName - the name of the MBean to check.

server - the MBean server to check.

Returns:

true if the MBean is registered, false otherwise.

Throws:

Exception - if any error occurs.

isCpuTimeEnabled

public static boolean isCpuTimeEnabled()

Whether CPU time measurement is enabled/supported.

Returns:

true if time measurement is enabled, false otherwise.

getThreadCpuTime

public static long getThreadCpuTime(long threadID)

Determien the CPU time for the specified thread.

Parameters:

threadID - the id of the thread.

Returns:

the CPU time in nanoseconds, or -1L if the cpu time is not supported or could not be measured.

getThreadUserTime

public static long getThreadUserTime(long threadID)

Determien the user time for the specified thread.

Parameters:

threadID - the id of the thread.

Returns:

the user time in nanoseconds, or -1L if the user time is not supported or could not be measured.