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143 lines
4.6 KiB
143 lines
4.6 KiB
/*
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* Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.lang.management;
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/**
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* The management interface for the operating system on which
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* the Java virtual machine is running.
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*
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* <p> A Java virtual machine has a single instance of the implementation
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* class of this interface. This instance implementing this interface is
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* an <a href="ManagementFactory.html#MXBean">MXBean</a>
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* that can be obtained by calling
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* the {@link ManagementFactory#getOperatingSystemMXBean} method or
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* from the {@link ManagementFactory#getPlatformMBeanServer
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* platform <tt>MBeanServer</tt>} method.
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*
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* <p>The <tt>ObjectName</tt> for uniquely identifying the MXBean for
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* the operating system within an MBeanServer is:
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* <blockquote>
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* {@link ManagementFactory#OPERATING_SYSTEM_MXBEAN_NAME
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* <tt>java.lang:type=OperatingSystem</tt>}
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* </blockquote>
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*
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* It can be obtained by calling the
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* {@link PlatformManagedObject#getObjectName} method.
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*
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* <p> This interface defines several convenient methods for accessing
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* system properties about the operating system on which the Java
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* virtual machine is running.
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*
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* @see ManagementFactory#getPlatformMXBeans(Class)
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* @see <a href="../../../javax/management/package-summary.html">
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* JMX Specification.</a>
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* @see <a href="package-summary.html#examples">
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* Ways to Access MXBeans</a>
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*
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* @author Mandy Chung
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* @since 1.5
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*/
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public interface OperatingSystemMXBean extends PlatformManagedObject {
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/**
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* Returns the operating system name.
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* This method is equivalent to <tt>System.getProperty("os.name")</tt>.
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*
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* @return the operating system name.
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*
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* @throws java.lang.SecurityException
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* if a security manager exists and its
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* <code>checkPropertiesAccess</code> method doesn't allow access
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* to this system property.
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* @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
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* @see java.lang.System#getProperty
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*/
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public String getName();
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/**
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* Returns the operating system architecture.
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* This method is equivalent to <tt>System.getProperty("os.arch")</tt>.
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*
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* @return the operating system architecture.
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*
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* @throws java.lang.SecurityException
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* if a security manager exists and its
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* <code>checkPropertiesAccess</code> method doesn't allow access
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* to this system property.
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* @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
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* @see java.lang.System#getProperty
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*/
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public String getArch();
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/**
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* Returns the operating system version.
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* This method is equivalent to <tt>System.getProperty("os.version")</tt>.
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*
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* @return the operating system version.
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*
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* @throws java.lang.SecurityException
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* if a security manager exists and its
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* <code>checkPropertiesAccess</code> method doesn't allow access
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* to this system property.
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* @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
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* @see java.lang.System#getProperty
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*/
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public String getVersion();
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/**
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* Returns the number of processors available to the Java virtual machine.
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* This method is equivalent to the {@link Runtime#availableProcessors()}
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* method.
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* <p> This value may change during a particular invocation of
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* the virtual machine.
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*
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* @return the number of processors available to the virtual
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* machine; never smaller than one.
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*/
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public int getAvailableProcessors();
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/**
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* Returns the system load average for the last minute.
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* The system load average is the sum of the number of runnable entities
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* queued to the {@linkplain #getAvailableProcessors available processors}
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* and the number of runnable entities running on the available processors
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* averaged over a period of time.
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* The way in which the load average is calculated is operating system
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* specific but is typically a damped time-dependent average.
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* <p>
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* If the load average is not available, a negative value is returned.
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* <p>
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* This method is designed to provide a hint about the system load
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* and may be queried frequently.
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* The load average may be unavailable on some platform where it is
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* expensive to implement this method.
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*
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* @return the system load average; or a negative value if not available.
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*
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* @since 1.6
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*/
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public double getSystemLoadAverage();
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}
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