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 package jdk.jfr.event.os;
  26 
  27 import java.util.List;
  28 
  29 import jdk.jfr.Recording;
  30 import jdk.jfr.consumer.RecordedEvent;
  31 import jdk.test.lib.jfr.EventNames;
  32 import jdk.test.lib.jfr.Events;
  33 
  34 /**
  35  * @test
  36  * @key jfr
  37  *
  38  * @library /lib /
  39  * @run main/othervm jdk.jfr.event.os.TestThreadContextSwitches
  40  */
  41 public class TestThreadContextSwitches {
  42     private final static String EVENT_NAME = EventNames.ThreadContextSwitchRate;
  43 
  44     public static void main(String[] args) throws Throwable {
  45         Recording recording = new Recording();
  46         recording.enable(EVENT_NAME);
  47         recording.start();
  48         recording.stop();
  49         List<RecordedEvent> events = Events.fromRecording(recording);
  50         Events.hasEvents(events);
  51         for (RecordedEvent event : events) {
  52             System.out.println("Event: " + event);
  53             Events.assertField(event, "switchRate").atLeast(0.0f);
  54         }
  55     }
  56 }