Java tutorial
/* * Copyright (c) 2003, 2013, 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 MBeanServer} method. * * <p>The {@code ObjectName} for uniquely identifying the MXBean for * the compilation system within an MBeanServer is: * <blockquote> * {@link ManagementFactory#COMPILATION_MXBEAN_NAME * java.lang:type=Compilation} * </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 {@code true} if the monitoring of compilation time is * supported; {@code false} otherwise. */ public boolean isCompilationTimeMonitoringSupported(); /** * Returns the approximate accumulated 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(); }