001 /* CompilationMXBean.java - Interface for a compilation bean 002 Copyright (C) 2006 Free Software Foundation 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 package java.lang.management; 039 040 /** 041 * Provides access to information about the Just-In-Time 042 * (JIT) compiler provided by the virtual machine, if one 043 * exists. An instance of this bean is obtainable by 044 * calling {@link ManagementFactory#getCompilationMXBean()} 045 * if a JIT is available. Otherwise, the method returns 046 * <code>null</code>. 047 * 048 * @author Andrew John Hughes (gnu_andrew@member.fsf.org) 049 * @since 1.5 050 */ 051 public interface CompilationMXBean 052 { 053 054 /** 055 * Returns the name of the Just-In-Time (JIT) compiler. 056 * 057 * @return the name of the JIT compiler. 058 */ 059 String getName(); 060 061 /** 062 * Returns true if the virtual machine's JIT compiler 063 * supports monitoring of the time spent compiling. 064 * 065 * @return true if the JIT compiler can be monitored 066 * for time spent compiling. 067 */ 068 boolean isCompilationTimeMonitoringSupported(); 069 070 /** 071 * Returns the accumulated time, in milliseconds, that 072 * the JIT compiler has spent compiling Java bytecodes 073 * to native machine code. This value represents a single 074 * time measurement for the whole virtual machine, including 075 * all multiple threads of operation. The value is not 076 * intended as a performance measurement. 077 * 078 * @return the accumulated number of milliseconds the JIT 079 * compiler has spent compiling. 080 * @throws UnsupportedOperationException if time monitoring 081 * is not supported. 082 */ 083 long getTotalCompilationTime(); 084 085 }