1 /*
   2  * Copyright (c) 2013, 2019, 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 package jdk.jfr.api.consumer;
  26 
  27 import java.util.List;
  28 
  29 import jdk.jfr.Recording;
  30 import jdk.jfr.consumer.RecordedEvent;
  31 import jdk.jfr.consumer.RecordedThreadGroup;
  32 import jdk.testlibrary.Asserts;
  33 import jdk.testlibrary.jfr.Events;
  34 import jdk.testlibrary.jfr.SimpleEvent;
  35 
  36 /*
  37  * @test
  38  * @summary Tests getParent method in RecordedThreadGroup
  39  * @key jfr
  40  * @library /lib/testlibrary
  41  * @run main/othervm jdk.jfr.api.consumer.TestRecordedThreadGroupParent
  42  */
  43 public class TestRecordedThreadGroupParent {
  44 
  45     public static void main(String[] args) throws Exception {
  46         ThreadGroup beforeStartGroup = new ThreadGroup(new ThreadGroup(new ThreadGroup("Grandfather"), "Father"), "Son");
  47         Thread beforeThread = new Thread(beforeStartGroup, () -> new SimpleEvent().commit(), "Before Recording Start");
  48 
  49         try (Recording r = new Recording()) {
  50             r.enable(SimpleEvent.class).withoutStackTrace();
  51             r.start();
  52             beforeThread.start();
  53             ThreadGroup afterStartGroup = new ThreadGroup(new ThreadGroup(new ThreadGroup("Grandmother"), "Mother"), "Daughter");
  54             Thread afterThread = new Thread(afterStartGroup, () -> new SimpleEvent().commit(), "After Recording Start");
  55             afterThread.start();
  56 
  57             beforeThread.join();
  58             afterThread.join();
  59 
  60             r.stop();
  61 
  62             List<RecordedEvent> events = Events.fromRecording(r);
  63             Events.hasEvents(events);
  64             for (RecordedEvent e : events) {
  65                 System.out.println(e);
  66                 switch (e.getThread().getJavaName()) {
  67                 case "Before Recording Start":
  68                     assetrThreadGroupParents(beforeStartGroup, e.getThread().getThreadGroup());
  69                     break;
  70                 case "After Recording Start":
  71                     assetrThreadGroupParents(afterStartGroup, e.getThread().getThreadGroup());
  72                     break;
  73                 default:
  74                     Asserts.fail("Unexpected thread found "  + e.getThread().getJavaName());
  75                 }
  76             }
  77         }
  78     }
  79 
  80     private static void assetrThreadGroupParents(ThreadGroup realGroup, RecordedThreadGroup recordedGroup) {
  81         if (recordedGroup == null && realGroup == null) {
  82             return; // root
  83         }
  84         Asserts.assertNotNull(recordedGroup, "Parent thread group should not be null");
  85         Asserts.assertEquals(realGroup.getName(), recordedGroup.getName(), "Parent thread group names don't match");
  86         assetrThreadGroupParents(realGroup.getParent(), recordedGroup.getParent());
  87     }
  88 }