| /* |
| * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import sun.jvmstat.monitor.Monitor; |
| import sun.jvmstat.monitor.MonitorException; |
| import sun.jvmstat.monitor.MonitoredHost; |
| import sun.jvmstat.monitor.MonitoredVm; |
| import sun.jvmstat.monitor.VmIdentifier; |
| import jdk.test.lib.process.ProcessTools; |
| |
| /** |
| * PerfCounters can be used to get a performance counter from the currently |
| * executing VM. |
| * |
| * Throws a runtime exception if an error occurs while communicating with the |
| * currently executing VM. |
| */ |
| public class PerfCounters { |
| private final static MonitoredVm vm; |
| |
| static { |
| try { |
| String pid = Long.toString(ProcessTools.getProcessId()); |
| VmIdentifier vmId = new VmIdentifier(pid); |
| MonitoredHost host = MonitoredHost.getMonitoredHost(vmId); |
| vm = host.getMonitoredVm(vmId); |
| } catch (Exception e) { |
| throw new RuntimeException("Could not connect to the VM"); |
| } |
| } |
| |
| /** |
| * Returns the performance counter with the given name. |
| * |
| * @param name The name of the performance counter. |
| * @throws IllegalArgumentException If no counter with the given name exists. |
| * @throws MonitorException If an error occurs while communicating with the VM. |
| * @return The performance counter with the given name. |
| */ |
| public static PerfCounter findByName(String name) |
| throws MonitorException, IllegalArgumentException { |
| Monitor m = vm.findByName(name); |
| if (m == null) { |
| throw new IllegalArgumentException("Did not find a performance counter with name " + name); |
| } |
| return new PerfCounter(m, name); |
| } |
| } |