1 /* 2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 package com.oracle.java.testlibrary; 25 26 import sun.jvmstat.monitor.Monitor; 27 import sun.jvmstat.monitor.MonitorException; 28 import sun.jvmstat.monitor.MonitoredHost; 29 import sun.jvmstat.monitor.MonitoredVm; 30 import sun.jvmstat.monitor.VmIdentifier; 31 32 /** 33 * PerfCounters can be used to get a performance counter from the currently 34 * executing VM. 35 * 36 * Throws a runtime exception if an error occurs while communicating with the 37 * currently executing VM. 38 */ 39 public class PerfCounters { 40 private final static MonitoredVm vm; 41 42 static { 43 try { 44 String pid = Integer.toString(ProcessTools.getProcessId()); 45 VmIdentifier vmId = new VmIdentifier(pid); 46 MonitoredHost host = MonitoredHost.getMonitoredHost(vmId); 47 vm = host.getMonitoredVm(vmId); 48 } catch (Exception e) { 49 throw new RuntimeException("Could not connect to the VM"); 50 } 51 } 52 53 /** 54 * Returns the performance counter with the given name. 55 * 56 * @param name The name of the performance counter. 57 * @throws IllegalArgumentException If no counter with the given name exists. 58 * @throws MonitorException If an error occurs while communicating with the VM. 59 * @return The performance counter with the given name. 60 */ 61 public static PerfCounter findByName(String name) 62 throws MonitorException, IllegalArgumentException { 63 Monitor m = vm.findByName(name); 64 if (m == null) { 65 throw new IllegalArgumentException("Did not find a performance counter with name " + name); 66 } 67 return new PerfCounter(m, name); 68 } 69 }