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Java Source Code / Java Documentation » 6.0 JDK Core » lang » java.lang.management 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.management.OperatingSystemMXBean

OperatingSystemMXBean
public interface OperatingSystemMXBean (Code)
The management interface for the operating system on which the Java virtual machine is running.

A Java virtual machine has a single instance of the implementation class of this interface. This instance implementing this interface is an MXBean that can be obtained by calling the ManagementFactory.getOperatingSystemMXBean method or from the ManagementFactory.getPlatformMBeanServerplatform MBeanServer method.

The ObjectName for uniquely identifying the MXBean for the operating system within an MBeanServer is:

ManagementFactory.OPERATING_SYSTEM_MXBEAN_NAMEjava.lang:type=OperatingSystem

This interface defines several convenient methods for accessing system properties about the operating system on which the Java virtual machine is running.
See Also:    * JMX Specification.
See Also:    * Ways to Access MXBeans
author:
   Mandy Chung
version:
   1.17, 05/05/07
since:
   1.5





Method Summary
public  StringgetArch()
     Returns the operating system architecture.
public  intgetAvailableProcessors()
     Returns the number of processors available to the Java virtual machine.
public  StringgetName()
     Returns the operating system name.
public  doublegetSystemLoadAverage()
     Returns the system load average for the last minute.
public  StringgetVersion()
     Returns the operating system version.



Method Detail
getArch
public String getArch()(Code)
Returns the operating system architecture. This method is equivalent to System.getProperty("os.arch"). the operating system architecture.
throws:
  java.lang.SecurityException - if a security manager exists and itscheckPropertiesAccess method doesn't allow accessto this system property.
See Also:   java.lang.SecurityManager.checkPropertyAccess(java.lang.String)
See Also:   java.lang.System.getProperty


getAvailableProcessors
public int getAvailableProcessors()(Code)
Returns the number of processors available to the Java virtual machine. This method is equivalent to the Runtime.availableProcessors method.

This value may change during a particular invocation of the virtual machine. the number of processors available to the virtualmachine; never smaller than one.



getName
public String getName()(Code)
Returns the operating system name. This method is equivalent to System.getProperty("os.name"). the operating system name.
throws:
  java.lang.SecurityException - if a security manager exists and itscheckPropertiesAccess method doesn't allow accessto this system property.
See Also:   java.lang.SecurityManager.checkPropertyAccess(java.lang.String)
See Also:   java.lang.System.getProperty


getSystemLoadAverage
public double getSystemLoadAverage()(Code)
Returns the system load average for the last minute. The system load average is the sum of the number of runnable entities queued to the and the number of runnable entities running on the available processors averaged over a period of time. The way in which the load average is calculated is operating system specific but is typically a damped time-dependent average.

If the load average is not available, a negative value is returned.

This method is designed to provide a hint about the system load and may be queried frequently. The load average may be unavailable on some platform where it is expensive to implement this method. the system load average; or a negative value if not available.
since:
   1.6



getVersion
public String getVersion()(Code)
Returns the operating system version. This method is equivalent to System.getProperty("os.version"). the operating system version.
throws:
  java.lang.SecurityException - if a security manager exists and itscheckPropertiesAccess method doesn't allow accessto this system property.
See Also:   java.lang.SecurityManager.checkPropertyAccess(java.lang.String)
See Also:   java.lang.System.getProperty


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