1 /* 2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.lang.management; 27 28 /** 29 * The management interface for the compilation system of 30 * the Java virtual machine. 31 * 32 * <p> A Java virtual machine has a single instance of the implementation 33 * class of this interface. This instance implementing this interface is 34 * an <a href="ManagementFactory.html#MXBean">MXBean</a> 35 * that can be obtained by calling 36 * the {@link ManagementFactory#getCompilationMXBean} method or 37 * from the {@link ManagementFactory#getPlatformMBeanServer 38 * platform <tt>MBeanServer</tt>} method. 39 * 40 * <p>The <tt>ObjectName</tt> for uniquely identifying the MXBean for 41 * the compilation system within an MBeanServer is: 42 * <blockquote> 43 * {@link ManagementFactory#COMPILATION_MXBEAN_NAME 44 * <tt>java.lang:type=Compilation</tt>} 45 * </blockquote> 46 * 47 * It can be obtained by calling the 48 * {@link PlatformManagedObject#getObjectName} method. 49 * 50 * @see ManagementFactory#getPlatformMXBeans(Class) 51 * @see <a href="../../../javax/management/package-summary.html"> 52 * JMX Specification.</a> 53 * @see <a href="package-summary.html#examples"> 54 * Ways to Access MXBeans</a> 55 * 56 * @author Mandy Chung 57 * @since 1.5 58 */ 59 public interface CompilationMXBean extends PlatformManagedObject { 60 /** 61 * Returns the name of the Just-in-time (JIT) compiler. 62 * 63 * @return the name of the JIT compiler. 64 */ getName()65 public java.lang.String getName(); 66 67 /** 68 * Tests if the Java virtual machine supports the monitoring of 69 * compilation time. 70 * 71 * @return <tt>true</tt> if the monitoring of compilation time is 72 * supported ; <tt>false</tt> otherwise. 73 */ isCompilationTimeMonitoringSupported()74 public boolean isCompilationTimeMonitoringSupported(); 75 76 /** 77 * Returns the approximate accumulated elapsed time (in milliseconds) 78 * spent in compilation. 79 * If multiple threads are used for compilation, this value is 80 * summation of the approximate time that each thread spent in compilation. 81 * 82 * <p>This method is optionally supported by the platform. 83 * A Java virtual machine implementation may not support the compilation 84 * time monitoring. The {@link #isCompilationTimeMonitoringSupported} 85 * method can be used to determine if the Java virtual machine 86 * supports this operation. 87 * 88 * <p> This value does not indicate the level of performance of 89 * the Java virtual machine and is not intended for performance comparisons 90 * of different virtual machine implementations. 91 * The implementations may have different definitions and different 92 * measurements of the compilation time. 93 * 94 * @return Compilation time in milliseconds 95 * @throws java.lang.UnsupportedOperationException if the Java 96 * virtual machine does not support 97 * this operation. 98 * 99 */ getTotalCompilationTime()100 public long getTotalCompilationTime(); 101 } 102