1 /*
   2  * Copyright (c) 2020, 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.gc.collection;
  27 
  28 import java.lang.management.ManagementFactory;
  29 import java.util.List;
  30 
  31 import jdk.jfr.Recording;
  32 import jdk.jfr.consumer.RecordedEvent;
  33 import jdk.test.lib.Asserts;
  34 import jdk.test.lib.jfr.EventNames;
  35 import jdk.test.lib.jfr.Events;
  36 
  37 /**
  38  * @test
  39  * @key jfr
  40  * @requires vm.hasJFR
  41  * @library /test/lib /test/jdk
  42  * @run main/othervm jdk.jfr.event.gc.collection.TestSystemGC
  43  */
  44 public class TestSystemGC {
  45     public static void main(String[] args) throws Exception {
  46         try (Recording recording = new Recording()) {
  47             recording.enable(EventNames.SystemGC);
  48             recording.start();
  49 
  50             // Trigger 3 System GC
  51             System.gc();
  52             ManagementFactory.getMemoryMXBean().gc();
  53             Runtime.getRuntime().gc();
  54 
  55             recording.stop();
  56             List<RecordedEvent> events = Events.fromRecording(recording);
  57             System.out.println(events);
  58 
  59             Asserts.assertEquals(3, events.size(), "Expected 3 SystemGC events");
  60 
  61             RecordedEvent event1 = events.get(0);
  62             Events.assertFrame(event1, System.class, "gc");
  63             Events.assertEventThread(event1, Thread.currentThread());
  64 
  65             RecordedEvent event2 = events.get(1);
  66             Events.assertFrame(event2, Runtime.class, "gc");
  67             Events.assertEventThread(event2, Thread.currentThread());
  68 
  69             RecordedEvent event3 = events.get(2);
  70             // MemoryMXBean.class is an interface so can't assertFrame on it
  71             Events.assertEventThread(event3, Thread.currentThread());
  72         }
  73      }
  74 }