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 }