1 /* 2 * Copyright (c) 2013, 2015, 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 import sun.jvmstat.monitor.Monitor; 25 import sun.jvmstat.monitor.MonitorException; 26 import sun.jvmstat.monitor.MonitoredHost; 27 import sun.jvmstat.monitor.MonitoredVm; 28 import sun.jvmstat.monitor.VmIdentifier; 29 import jdk.test.lib.ProcessTools; 30 31 /** 32 * PerfCounters can be used to get a performance counter from the currently 33 * executing VM. 34 * 35 * Throws a runtime exception if an error occurs while communicating with the 36 * currently executing VM. 37 */ 38 public class PerfCounters { 39 private final static MonitoredVm vm; 40 41 static { 42 try { 43 String pid = Long.toString(ProcessTools.getProcessId()); 44 VmIdentifier vmId = new VmIdentifier(pid); 45 MonitoredHost host = MonitoredHost.getMonitoredHost(vmId); 46 vm = host.getMonitoredVm(vmId); 47 } catch (Exception e) { 48 throw new RuntimeException("Could not connect to the VM"); 49 } 50 } 51 52 /** 53 * Returns the performance counter with the given name. 54 * 55 * @param name The name of the performance counter. 56 * @throws IllegalArgumentException If no counter with the given name exists. 57 * @throws MonitorException If an error occurs while communicating with the VM. 58 * @return The performance counter with the given name. 59 */ 60 public static PerfCounter findByName(String name) 61 throws MonitorException, IllegalArgumentException { 62 Monitor m = vm.findByName(name); 63 if (m == null) { 64 throw new IllegalArgumentException("Did not find a performance counter with name " + name); 65 } 66 return new PerfCounter(m, name); 67 } 68 }