001/* CompilationMXBean.java - Interface for a compilation bean 002 Copyright (C) 2006 Free Software Foundation 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038package 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 */ 051public 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}