/* * 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 * or visit www.oracle.com if you need additional information or have any * questions. */ package java.lang.management; /** * The management interface for the compilation 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#getCompilationMXBean} method or * from the {@link ManagementFactory#getPlatformMBeanServer * platform <tt>MBeanServer</tt>} method. * * <p>The <tt>ObjectName</tt> for uniquely identifying the MXBean for * the compilation system within an MBeanServer is: * <blockquote> *  {@link ManagementFactory#COMPILATION_MXBEAN_NAME *         <tt>java.lang:type=Compilation</tt>} * </blockquote> * * It can be obtained by calling the * {@link PlatformManagedObject#getObjectName} method. * * @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 CompilationMXBean extends PlatformManagedObject {    /**     * Returns the name of the Just-in-time (JIT) compiler.     *     * @return the name of the JIT compiler.     */    public java.lang.String    getName();     /**     * Tests if the Java virtual machine supports the monitoring of     * compilation time.     *     * @return <tt>true</tt> if the monitoring of compilation time is     * supported ; <tt>false</tt> otherwise.     */    public boolean isCompilationTimeMonitoringSupported();     /**     * Returns the approximate accumlated elapsed time (in milliseconds)     * spent in compilation.     * If multiple threads are used for compilation, this value is     * summation of the approximate time that each thread spent in compilation.     *     * <p>This method is optionally supported by the platform.     * A Java virtual machine implementation may not support the compilation     * time monitoring. The {@link #isCompilationTimeMonitoringSupported}     * method can be used to determine if the Java virtual machine     * supports this operation.     *     * <p> This value does not indicate the level of performance of     * the Java virtual machine and is not intended for performance comparisons     * of different virtual machine implementations.     * The implementations may have different definitions and different     * measurements of the compilation time.     *     * @return Compilation time in milliseconds     * @throws java.lang.UnsupportedOperationException if the Java     * virtual machine does not support     * this operation.     *     */    public long                getTotalCompilationTime();}