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package java.lang.management;
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
platform MBeanServer method.
The ObjectName for uniquely identifying the MXBean for the operating system within an MBeanServer is:
java.lang:type=OperatingSystem
It can be obtained by calling the PlatformManagedObject.getObjectName method. This interface defines several convenient methods for accessing
system properties about the operating system on which the Java
virtual machine is running.
Author: Mandy Chung See Also: Since: 1.5
/**
* The management interface for the operating system on which
* the Java virtual machine is running.
*
* <p> A Java virtual machine has a single instance of the implementation
* class of this interface. This instance implementing this interface is
* an <a href="ManagementFactory.html#MXBean">MXBean</a>
* that can be obtained by calling
* the {@link ManagementFactory#getOperatingSystemMXBean} method or
* from the {@link ManagementFactory#getPlatformMBeanServer
* platform MBeanServer} method.
*
* <p>The {@code ObjectName} for uniquely identifying the MXBean for
* the operating system within an MBeanServer is:
* <blockquote>
* {@link ManagementFactory#OPERATING_SYSTEM_MXBEAN_NAME
* java.lang:type=OperatingSystem}
* </blockquote>
*
* It can be obtained by calling the
* {@link PlatformManagedObject#getObjectName} method.
*
* <p> This interface defines several convenient methods for accessing
* system properties about the operating system on which the Java
* virtual machine is running.
*
* @see ManagementFactory#getPlatformMXBeans(Class)
* @see <a href="../../../javax/management/package-summary.html">
* JMX Specification.</a>
* @see <a href="package-summary.html#examples">
* Ways to Access MXBeans</a>
*
* @author Mandy Chung
* @since 1.5
*/
public interface OperatingSystemMXBean extends PlatformManagedObject {
Returns the operating system name. This method is equivalent to System.getProperty("os.name"). Throws: - SecurityException –
if a security manager exists and its
checkPropertiesAccess method doesn't allow access
to this system property.
See Also: Returns: the operating system name.
/**
* Returns the operating system name.
* This method is equivalent to {@code System.getProperty("os.name")}.
*
* @return the operating system name.
*
* @throws java.lang.SecurityException
* if a security manager exists and its
* <code>checkPropertiesAccess</code> method doesn't allow access
* to this system property.
* @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
* @see java.lang.System#getProperty
*/
public String getName();
Returns the operating system architecture. This method is equivalent to System.getProperty("os.arch"). Throws: - SecurityException –
if a security manager exists and its
checkPropertiesAccess method doesn't allow access
to this system property.
See Also: Returns: the operating system architecture.
/**
* Returns the operating system architecture.
* This method is equivalent to {@code System.getProperty("os.arch")}.
*
* @return the operating system architecture.
*
* @throws java.lang.SecurityException
* if a security manager exists and its
* <code>checkPropertiesAccess</code> method doesn't allow access
* to this system property.
* @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
* @see java.lang.System#getProperty
*/
public String getArch();
Returns the operating system version. This method is equivalent to System.getProperty("os.version"). Throws: - SecurityException –
if a security manager exists and its
checkPropertiesAccess method doesn't allow access
to this system property.
See Also: Returns: the operating system version.
/**
* Returns the operating system version.
* This method is equivalent to {@code System.getProperty("os.version")}.
*
* @return the operating system version.
*
* @throws java.lang.SecurityException
* if a security manager exists and its
* <code>checkPropertiesAccess</code> method doesn't allow access
* to this system property.
* @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
* @see java.lang.System#getProperty
*/
public String getVersion();
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.
Returns: the number of processors available to the virtual
machine; never smaller than one.
/**
* Returns the number of processors available to the Java virtual machine.
* This method is equivalent to the {@link Runtime#availableProcessors()}
* method.
* <p> This value may change during a particular invocation of
* the virtual machine.
*
* @return the number of processors available to the virtual
* machine; never smaller than one.
*/
public int getAvailableProcessors();
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 available processors 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.
Returns: the system load average; or a negative value if not available. Since: 1.6
/**
* 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 {@linkplain #getAvailableProcessors available processors}
* 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.
* <p>
* If the load average is not available, a negative value is returned.
* <p>
* 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.
*
* @return the system load average; or a negative value if not available.
*
* @since 1.6
*/
public double getSystemLoadAverage();
}