1 /* VMRuntimeMXBeanImpl.java - VM implementation of an runtime bean 2 Copyright (C) 2006, 2010 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 package gnu.java.lang.management; 39 40 import gnu.classpath.SystemProperties; 41 42 /** 43 * Provides access to information about the virtual machine. 44 * 45 * @author Andrew John Hughes (gnu_andrew@member.fsf.org) 46 * @since 1.5 47 */ 48 final class VMRuntimeMXBeanImpl 49 { 50 VMRuntimeMXBeanImpl()51 private VMRuntimeMXBeanImpl() {} // Prohibits instantiation. 52 53 /** 54 * Returns the command-line arguments supplied 55 * to the virtual machine, excluding those supplied 56 * to <code>main()</code>. 57 * 58 * @return the command-line arguments. 59 */ getInputArguments()60 static native String[] getInputArguments(); 61 62 /** 63 * Returns a developer-chosen name for the virtual 64 * machine, which may differ over different running 65 * instances of the same virtual machine binary. 66 * For example, this may include the particular 67 * process identifier used by this instance or 68 * the host name of the machine on which it is 69 * running. The intention is that this name refers 70 * to the precise entity that the other data supplied 71 * by the bean refers to, rather than the VM in general. 72 * 73 * @return the custom name of the VM. 74 */ getName()75 static String getName() 76 { 77 return SystemProperties.getProperty("java.vm.name") + " " + 78 SystemProperties.getProperty("java.vm.version"); 79 } 80 81 /** 82 * The time in milliseconds at which the virtual 83 * machine was started. This method is only executed 84 * once (for efficency), as the value is not expected 85 * to change. 86 * 87 * @return the VM start time. 88 */ getStartTime()89 static native long getStartTime(); 90 91 } 92