110 lines
3.6 KiB
Java
110 lines
3.6 KiB
Java
/* VMRuntimeMXBeanImpl.java - VM implementation of an runtime bean
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Copyright (C) 2006 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.lang.management;
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import gnu.classpath.SystemProperties;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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/**
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* Provides access to information about the virtual machine.
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*
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* @author Andrew John Hughes (gnu_andrew@member.fsf.org)
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* @since 1.5
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*/
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final class VMRuntimeMXBeanImpl
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{
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/**
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* Returns the command-line arguments supplied
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* to the virtual machine, excluding those supplied
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* to <code>main()</code>.
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*
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* @return the command-line arguments.
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*/
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static native String[] getInputArguments();
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/**
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* Returns a developer-chosen name for the virtual
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* machine, which may differ over different running
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* instances of the same virtual machine binary.
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* For example, this may include the particular
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* process identifier used by this instance or
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* the host name of the machine on which it is
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* running. The intention is that this name refers
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* to the precise entity that the other data supplied
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* by the bean refers to, rather than the VM in general.
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*
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* @return the custom name of the VM.
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*/
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static String getName()
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{
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String hostName;
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try
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{
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hostName = InetAddress.getLocalHost().getHostName();
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}
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catch (UnknownHostException e)
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{
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hostName = "Unknown host";
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}
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return SystemProperties.getProperty("java.vm.name") + " " +
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SystemProperties.getProperty("java.vm.version") + " [" +
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getPID() + "@" + hostName + "]";
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}
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/**
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* The time in milliseconds at which the virtual
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* machine was started. This method is only executed
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* once (for efficency), as the value is not expected
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* to change.
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*
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* @return the VM start time.
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*/
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static native long getStartTime();
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/**
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* The process identifier of the runtime.
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*
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* @return the PID of the runtime.
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*/
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private static native long getPID();
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}
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