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  * @library /test/lib

    38  * @run main/othervm jdk.jfr.event.os.TestThreadContextSwitches

    39  */

    40 public class TestThreadContextSwitches {

    41     private final static String EVENT_NAME = EventNames.ThreadContextSwitchRate;

    42 

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

    44         Recording recording = new Recording();

    45         recording.enable(EVENT_NAME);

    46         recording.start();

    47         recording.stop();

    48         List<RecordedEvent> events = Events.fromRecording(recording);

    49         Events.hasEvents(events);

    50         for (RecordedEvent event : events) {

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

    52             Events.assertField(event, "switchRate").atLeast(0.0f);

    53         }

    54     }

    55 }