1 /*

     2  * Copyright (c) 2013, 2018, 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.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.jfr.event.runtime;

    27 

    28 import static jdk.test.lib.Asserts.assertEquals;

    29 import static jdk.test.lib.Asserts.assertTrue;

    30 

    31 import java.lang.management.ManagementFactory;

    32 

    33 import com.sun.management.HotSpotDiagnosticMXBean;

    34 

    35 import jdk.jfr.Recording;

    36 import jdk.jfr.consumer.RecordedEvent;

    37 import jdk.test.lib.jfr.EventNames;

    38 import jdk.test.lib.jfr.Events;

    39 

    40 /*

    41  * @test TestVmFlagChangedEvent

    42  * @key jfr

    43  * @library /test/lib

    44  * @modules jdk.jfr

    45  *          jdk.management

    46  *

    47  * @run main/othervm jdk.jfr.event.runtime.TestVmFlagChangedEvent

    48  */

    49 public final class TestVmFlagChangedEvent {

    50 

    51     public static void main(String[] args) throws Throwable {

    52         EventFlag[] eventFlags = {

    53             new EventFlag(EventNames.LongFlagChanged, "CMSWaitDuration", "2500"),

    54             new EventFlag(EventNames.StringFlagChanged, "HeapDumpPath", "/a/sample/path"),

    55             new EventFlag(EventNames.BooleanFlagChanged, "HeapDumpOnOutOfMemoryError", "true")

    56         };

    57 

    58         Recording recording = new Recording();

    59         for (EventFlag eventFlag : eventFlags) {

    60             recording.enable(eventFlag.eventName);

    61         }

    62 

    63         recording.start();

    64         HotSpotDiagnosticMXBean mbean = ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class);

    65         for (EventFlag eventFlag : eventFlags) {

    66             eventFlag.update(mbean);

    67         }

    68         recording.stop();

    69 

    70         for (RecordedEvent event : Events.fromRecording(recording)) {

    71             final String flagName = Events.assertField(event, "name").getValue();

    72             System.out.println("flag name=" + flagName);

    73             for (EventFlag eventFlag : eventFlags) {

    74                 if (flagName.equals(eventFlag.eventLabel)) {

    75                     System.out.println("Event:" + event);

    76                     Object newValue = Events.assertField(event, "newValue").getValue();

    77                     Object oldValue = Events.assertField(event, "oldValue").getValue();

    78                     System.out.println("newValue:" + asText(newValue));

    79                     System.out.println("oldValue:" + asText(oldValue));

    80                     assertEquals(eventFlag.newValue, asText(newValue), "Wrong new value: expected" + eventFlag.newValue);

    81                     assertEquals(eventFlag.oldValue, asText(oldValue), "Wrong old value: expected" + eventFlag.oldValue);

    82                     Events.assertField(event, "origin").equal("Management");

    83                     eventFlag.isFound = true;

    84                     break;

    85                 }

    86             }

    87         }

    88         for (EventFlag eventFlag : eventFlags) {

    89             assertTrue(eventFlag.isFound, "Missing flag change for: " + eventFlag.eventLabel);

    90         }

    91     }

    92 

    93     private static String asText(Object value) {

    94         if (value == null) {

    95             return ""; // HotSpotDiagnosticMXBean interface return "" for unset values

    96         }

    97         return String.valueOf(value);

    98     }

    99 

   100     private static class EventFlag {

   101         final String eventName;

   102         final String eventLabel;

   103         String newValue;

   104         String oldValue;

   105         boolean isFound = false;

   106 

   107         EventFlag(String eventName, String eventLabel, String newValue) {

   108             this.eventName = eventName;

   109             this.eventLabel = eventLabel;

   110             this.newValue = newValue;

   111         }

   112 

   113         void update(HotSpotDiagnosticMXBean mbean) {

   114             this.oldValue = mbean.getVMOption(eventLabel).getValue();

   115             mbean.setVMOption(eventLabel, newValue);

   116         }

   117     }

   118 }