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package com.sun.management;


Platform-specific management interface for the operating system
on which the Java virtual machine is running.


The OperatingSystemMXBean object returned by ManagementFactory.getOperatingSystemMXBean() is an instance of the implementation class of this interface or UnixOperatingSystemMXBean interface depending on its underlying operating system. 
Author: Mandy Chung
Since:  1.5
/**
 * Platform-specific management interface for the operating system
 * on which the Java virtual machine is running.
 *
 * <p>
 * The <tt>OperatingSystemMXBean</tt> object returned by
 * {@link java.lang.management.ManagementFactory#getOperatingSystemMXBean()}
 * is an instance of the implementation class of this interface
 * or {@link UnixOperatingSystemMXBean} interface depending on
 * its underlying operating system.
 *
 * @author  Mandy Chung
 * @since   1.5
 */
public interface OperatingSystemMXBean extends
    java.lang.management.OperatingSystemMXBean {

    
Returns the amount of virtual memory that is guaranteed to
be available to the running process in bytes,
or -1 if this operation is not supported.

Returns:the amount of virtual memory that is guaranteed to
be available to the running process in bytes,
or -1 if this operation is not supported.
/**
     * Returns the amount of virtual memory that is guaranteed to
     * be available to the running process in bytes,
     * or <tt>-1</tt> if this operation is not supported.
     *
     * @return the amount of virtual memory that is guaranteed to
     * be available to the running process in bytes,
     * or <tt>-1</tt> if this operation is not supported.
     */
    public long getCommittedVirtualMemorySize();

    
Returns the total amount of swap space in bytes.

Returns:the total amount of swap space in bytes.
/**
     * Returns the total amount of swap space in bytes.
     *
     * @return the total amount of swap space in bytes.
     */
    public long getTotalSwapSpaceSize();

    
Returns the amount of free swap space in bytes.

Returns:the amount of free swap space in bytes.
/**
     * Returns the amount of free swap space in bytes.
     *
     * @return the amount of free swap space in bytes.
     */
    public long getFreeSwapSpaceSize();

    
Returns the CPU time used by the process on which the Java
virtual machine is running in nanoseconds.  The returned value
is of nanoseconds precision but not necessarily nanoseconds
accuracy.  This method returns -1 if the
the platform does not support this operation.

Returns:the CPU time used by the process in nanoseconds,
or -1 if this operation is not supported.
/**
     * Returns the CPU time used by the process on which the Java
     * virtual machine is running in nanoseconds.  The returned value
     * is of nanoseconds precision but not necessarily nanoseconds
     * accuracy.  This method returns <tt>-1</tt> if the
     * the platform does not support this operation.
     *
     * @return the CPU time used by the process in nanoseconds,
     * or <tt>-1</tt> if this operation is not supported.
     */
    public long getProcessCpuTime();

    
Returns the amount of free physical memory in bytes.

Returns:the amount of free physical memory in bytes.
/**
     * Returns the amount of free physical memory in bytes.
     *
     * @return the amount of free physical memory in bytes.
     */
    public long getFreePhysicalMemorySize();

    
Returns the total amount of physical memory in bytes.

Returns:the total amount of physical memory in  bytes.
/**
     * Returns the total amount of physical memory in bytes.
     *
     * @return the total amount of physical memory in  bytes.
     */
    public long getTotalPhysicalMemorySize();
}