/*

 * Copyright (c) 2003, 2008, 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

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 */

package java.lang.management;

/**

 * The management interface for the runtime system of

 * the Java virtual machine.

 *

 * <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#getRuntimeMXBean} method or

 * from the {@link ManagementFactory#getPlatformMBeanServer

 * platform <tt>MBeanServer</tt>} method.

 *

 * <p>The <tt>ObjectName</tt> for uniquely identifying the MXBean for

 * the runtime system within an MBeanServer is:

 * <blockquote>

 *    {@link ManagementFactory#RUNTIME_MXBEAN_NAME

 *           <tt>java.lang:type=Runtime</tt>}

 * </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 Java virtual machine.

 *

 * @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 RuntimeMXBean extends PlatformManagedObject {

    /**

     * Returns the name representing the running Java virtual machine.

     * The returned name string can be any arbitrary string and

     * a Java virtual machine implementation can choose

     * to embed platform-specific useful information in the

     * returned name string.  Each running virtual machine could have

     * a different name.

     *

     * @return the name representing the running Java virtual machine.

     */

    public String getName();

    /**

     * Returns the Java virtual machine implementation name.

     * This method is equivalent to {@link System#getProperty

     * System.getProperty("java.vm.name")}.

     *

     * @return the Java virtual machine implementation 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 getVmName();

    /**

     * Returns the Java virtual machine implementation vendor.

     * This method is equivalent to {@link System#getProperty

     * System.getProperty("java.vm.vendor")}.

     *

     * @return the Java virtual machine implementation vendor.

     *

     * @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 getVmVendor();

    /**

     * Returns the Java virtual machine implementation version.

     * This method is equivalent to {@link System#getProperty

     * System.getProperty("java.vm.version")}.

     *

     * @return the Java virtual machine implementation 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 getVmVersion();

    /**

     * Returns the Java virtual machine specification name.

     * This method is equivalent to {@link System#getProperty

     * System.getProperty("java.vm.specification.name")}.

     *

     * @return the Java virtual machine specification 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 getSpecName();

    /**

     * Returns the Java virtual machine specification vendor.

     * This method is equivalent to {@link System#getProperty

     * System.getProperty("java.vm.specification.vendor")}.

     *

     * @return the Java virtual machine specification vendor.

     *

     * @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 getSpecVendor();

    /**

     * Returns the Java virtual machine specification version.

     * This method is equivalent to {@link System#getProperty

     * System.getProperty("java.vm.specification.version")}.

     *

     * @return the Java virtual machine specification 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 getSpecVersion();

    /**

     * Returns the version of the specification for the management interface

     * implemented by the running Java virtual machine.

     *

     * @return the version of the specification for the management interface

     * implemented by the running Java virtual machine.

     */

    public String getManagementSpecVersion();

    /**

     * Returns the Java class path that is used by the system class loader

     * to search for class files.

     * This method is equivalent to {@link System#getProperty

     * System.getProperty("java.class.path")}.

     *

     * <p> Multiple paths in the Java class path are separated by the

     * path separator character of the platform of the Java virtual machine

     * being monitored.

     *

     * @return the Java class path.

     *

     * @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 getClassPath();

    /**

     * Returns the Java library path.

     * This method is equivalent to {@link System#getProperty

     * System.getProperty("java.library.path")}.

     *

     * <p> Multiple paths in the Java library path are separated by the

     * path separator character of the platform of the Java virtual machine

     * being monitored.

     *

     * @return the Java library path.

     *

     * @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 getLibraryPath();

    /**

     * Tests if the Java virtual machine supports the boot class path

     * mechanism used by the bootstrap class loader to search for class

     * files.

     *

     * @return <tt>true</tt> if the Java virtual machine supports the

     * class path mechanism; <tt>false</tt> otherwise.

     */

    public boolean isBootClassPathSupported();

    /**

     * Returns the boot class path that is used by the bootstrap class loader

     * to search for class files.

     *

     * <p> Multiple paths in the boot class path are separated by the

     * path separator character of the platform on which the Java

     * virtual machine is running.

     *

     * <p>A Java virtual machine implementation may not support

     * the boot class path mechanism for the bootstrap class loader

     * to search for class files.

     * The {@link #isBootClassPathSupported} method can be used

     * to determine if the Java virtual machine supports this method.

     *

     * @return the boot class path.

     *

     * @throws java.lang.UnsupportedOperationException

     *     if the Java virtual machine does not support this operation.

     *

     * @throws  java.lang.SecurityException

     *     if a security manager exists and the caller does not have

     *     ManagementPermission("monitor").

     */

    public String getBootClassPath();

    /**

     * Returns the input arguments passed to the Java virtual machine

     * which does not include the arguments to the <tt>main</tt> method.

     * This method returns an empty list if there is no input argument

     * to the Java virtual machine.

     * <p>

     * Some Java virtual machine implementations may take input arguments

     * from multiple different sources: for examples, arguments passed from

     * the application that launches the Java virtual machine such as

     * the 'java' command, environment variables, configuration files, etc.

     * <p>

     * Typically, not all command-line options to the 'java' command

     * are passed to the Java virtual machine.

     * Thus, the returned input arguments may not

     * include all command-line options.

     *

     * <p>

     * <b>MBeanServer access</b>:<br>

     * The mapped type of <tt>List<String></tt> is <tt>String[]</tt>.

     *

     * @return a list of <tt>String</tt> objects; each element

     * is an argument passed to the Java virtual machine.

     *

     * @throws  java.lang.SecurityException

     *     if a security manager exists and the caller does not have

     *     ManagementPermission("monitor").

     */

    public java.util.List<String> getInputArguments();

    /**

     * Returns the uptime of the Java virtual machine in milliseconds.

     *

     * @return uptime of the Java virtual machine in milliseconds.

     */

    public long getUptime();

    /**

     * Returns the start time of the Java virtual machine in milliseconds.

     * This method returns the approximate time when the Java virtual

     * machine started.

     *

     * @return start time of the Java virtual machine in milliseconds.

     *

     */

    public long getStartTime();

    /**

     * Returns a map of names and values of all system properties.

     * This method calls {@link System#getProperties} to get all

     * system properties.  Properties whose name or value is not

     * a <tt>String</tt> are omitted.

     *

     * <p>

     * <b>MBeanServer access</b>:<br>

     * {@link javax.management.openmbean.TabularData TabularData}

     * with two items in each row as follows:

     * <blockquote>

     * <table border>

     * <tr>

     *   <th>Item Name</th>

     *   <th>Item Type</th>

     *   </tr>

     * <tr>

     *   <td><tt>key</tt></td>

     *   <td><tt>String</tt></td>

     *   </tr>

     * <tr>

     *   <td><tt>value</tt></td>

     *   <td><tt>String</tt></td>

     *   </tr>

     * </table>

     * </blockquote>

     *

     * @return a map of names and values of all system properties.

     *

     * @throws  java.lang.SecurityException

     *     if a security manager exists and its

     *     <code>checkPropertiesAccess</code> method doesn't allow access

     *     to the system properties.

     */

    public java.util.Map<String, String> getSystemProperties();

}