1 /* |
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2 * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 |
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24 import sun.jvmstat.monitor.Monitor; |
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25 import sun.jvmstat.monitor.MonitorException; |
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26 import sun.jvmstat.monitor.MonitoredHost; |
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27 import sun.jvmstat.monitor.MonitoredVm; |
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28 import sun.jvmstat.monitor.VmIdentifier; |
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29 import jdk.test.lib.process.ProcessTools; |
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30 |
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31 /** |
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32 * PerfCounters can be used to get a performance counter from the currently |
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33 * executing VM. |
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34 * |
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35 * Throws a runtime exception if an error occurs while communicating with the |
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36 * currently executing VM. |
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37 */ |
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38 public class PerfCounters { |
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39 private final static MonitoredVm vm; |
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40 |
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41 static { |
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42 try { |
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43 String pid = Long.toString(ProcessTools.getProcessId()); |
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44 VmIdentifier vmId = new VmIdentifier(pid); |
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45 MonitoredHost host = MonitoredHost.getMonitoredHost(vmId); |
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46 vm = host.getMonitoredVm(vmId); |
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47 } catch (Exception e) { |
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48 throw new RuntimeException("Could not connect to the VM"); |
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49 } |
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50 } |
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51 |
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52 /** |
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53 * Returns the performance counter with the given name. |
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54 * |
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55 * @param name The name of the performance counter. |
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56 * @throws IllegalArgumentException If no counter with the given name exists. |
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57 * @throws MonitorException If an error occurs while communicating with the VM. |
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58 * @return The performance counter with the given name. |
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59 */ |
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60 public static PerfCounter findByName(String name) |
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61 throws MonitorException, IllegalArgumentException { |
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62 Monitor m = vm.findByName(name); |
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63 if (m == null) { |
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64 throw new IllegalArgumentException("Did not find a performance counter with name " + name); |
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65 } |
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66 return new PerfCounter(m, name); |
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67 } |
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68 } |
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