Mercurial > hg > release > thermostat-1.6
view system-backend/src/main/java/com/redhat/thermostat/backend/system/JvmStatDataExtractor.java @ 2049:a92d602216ad
Update copyright license headers for 2017
PR3290
Reviewed-by: jerboaa
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2017-January/021974.html
author | Andrew Azores <aazores@redhat.com> |
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date | Tue, 17 Jan 2017 12:19:56 -0500 |
parents | 31f274ab27a5 |
children |
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/* * Copyright 2012-2017 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2, or (at your * option) any later version. * * Thermostat is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.backend.system; import sun.jvmstat.monitor.MonitorException; import sun.jvmstat.monitor.MonitoredVm; import sun.jvmstat.monitor.MonitoredVmUtil; /** * A helper class to provide type-safe access to commonly used jvmstat monitors * <p> * Implementation details: For local vms, jvmstat uses a ByteBuffer * corresponding to mmap()ed hsperfdata file. The hsperfdata file is updated * asynchronously by the vm that created the file. The polling that jvmstat api * provides is merely an abstraction over this (possibly always up-to-date) * ByteBuffer. So the data this class extracts is as current as possible, and * does not correspond to when the jvmstat update events fired. */ public class JvmStatDataExtractor { /* * Note, there may be a performance issue to consider here. We have a lot of * string constants. When we start adding some of the more heavyweight * features, and running into CPU issues this may need to be reconsidered in * order to avoid the String pool overhead. See also: * http://docs.oracle.com/javase/6/docs/api/java/lang/String.html#intern() */ private final MonitoredVm vm; public JvmStatDataExtractor(MonitoredVm vm) { this.vm = vm; } public String getCommandLine() throws MonitorException { return MonitoredVmUtil.commandLine(vm); } public String getMainClass() throws MonitorException { return MonitoredVmUtil.mainClass(vm, true); } public String getJavaVersion() throws MonitorException { return (String) vm.findByName("java.property.java.version").getValue(); } public String getJavaHome() throws MonitorException { return (String) vm.findByName("java.property.java.home").getValue(); } public String getVmName() throws MonitorException { return (String) vm.findByName("java.property.java.vm.name").getValue(); } public String getVmInfo() throws MonitorException { return (String) vm.findByName("java.property.java.vm.info").getValue(); } public String getVmVersion() throws MonitorException { return (String) vm.findByName("java.property.java.vm.version").getValue(); } public String getVmArguments() throws MonitorException { return MonitoredVmUtil.jvmArgs(vm); } }