/* * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.management; /** * 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 <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.     *     * @return the total amount of swap space in bytes.     */    public long getTotalSwapSpaceSize();     /**     * 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 <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.     *     * @return the amount of free physical memory in bytes.     */    public long getFreePhysicalMemorySize();     /**     * Returns the total amount of physical memory in bytes.     *     * @return the total amount of physical memory in  bytes.     */    public long getTotalPhysicalMemorySize();     /**     * Returns the "recent cpu usage" for the whole system. This value is a     * double in the [0.0,1.0] interval. A value of 0.0 means that all CPUs     * were idle during the recent period of time observed, while a value     * of 1.0 means that all CPUs were actively running 100% of the time     * during the recent period being observed. All values betweens 0.0 and     * 1.0 are possible depending of the activities going on in the system.     * If the system recent cpu usage is not available, the method returns a     * negative value.     *     * @return the "recent cpu usage" for the whole system; a negative     * value if not available.     * @since   1.7     */    public double getSystemCpuLoad();     /**     * Returns the "recent cpu usage" for the Java Virtual Machine process.     * This value is a double in the [0.0,1.0] interval. A value of 0.0 means     * that none of the CPUs were running threads from the JVM process during     * the recent period of time observed, while a value of 1.0 means that all     * CPUs were actively running threads from the JVM 100% of the time     * during the recent period being observed. Threads from the JVM include     * the application threads as well as the JVM internal threads. All values     * betweens 0.0 and 1.0 are possible depending of the activities going on     * in the JVM process and the whole system. If the Java Virtual Machine     * recent CPU usage is not available, the method returns a negative value.     *     * @return the "recent cpu usage" for the Java Virtual Machine process;     * a negative value if not available.     * @since   1.7     */    public double getProcessCpuLoad(); }