1 /*
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   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
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   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.
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  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).
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  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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  24  */
  25 
  26 package jdk.jfr.event.gc.objectcount;
  27 
  28 import java.util.List;
  29 import java.util.Optional;
  30 import java.util.stream.Collectors;
  31 
  32 import jdk.jfr.Recording;
  33 import jdk.jfr.consumer.RecordedEvent;
  34 import jdk.testlibrary.Asserts;
  35 import jdk.testlibrary.jfr.EventNames;
  36 import jdk.testlibrary.jfr.Events;
  37 
  38 
  39 public class ObjectCountAfterGCEvent {
  40 
  41     private static final String objectCountEventPath = EventNames.ObjectCountAfterGC;
  42     private static final String gcEventPath = EventNames.GarbageCollection;
  43     private static final String heapSummaryEventPath = EventNames.GCHeapSummary;
  44 
  45     public static void test(String gcName) throws Exception {
  46         Recording recording = new Recording();
  47         recording.enable(objectCountEventPath);
  48         recording.enable(gcEventPath);
  49         recording.enable(heapSummaryEventPath);
  50 
  51         ObjectCountEventVerifier.createTestData();
  52         recording.start();
  53         System.gc();
  54         System.gc();
  55         recording.stop();
  56 
  57         System.out.println("gcName=" + gcName);
  58         for (RecordedEvent event : Events.fromRecording(recording)) {
  59             System.out.println("Event: " + event);
  60         }
  61 
  62         List<RecordedEvent> events= Events.fromRecording(recording);
  63         Optional<RecordedEvent> gcEvent = events.stream()
  64                                 .filter(e -> isMySystemGc(e, gcName))
  65                                 .findFirst();
  66         Asserts.assertTrue(gcEvent.isPresent(), "No event System.gc event of type " + gcEventPath);
  67         System.out.println("Found System.gc event: " + gcEvent.get());
  68         int gcId = Events.assertField(gcEvent.get(), "gcId").getValue();
  69 
  70         List<RecordedEvent> objCountEvents = events.stream()
  71                                 .filter(e -> Events.isEventType(e, objectCountEventPath))
  72                                 .filter(e -> isGcId(e, gcId))
  73                                 .collect(Collectors.toList());
  74         Asserts.assertFalse(objCountEvents.isEmpty(), "No objCountEvents for gcId=" + gcId);
  75 
  76         Optional<RecordedEvent> heapSummaryEvent = events.stream()
  77                                 .filter(e -> Events.isEventType(e, heapSummaryEventPath))
  78                                 .filter(e -> isGcId(e, gcId))
  79                                 .filter(e -> "After GC".equals(Events.assertField(e, "when").getValue()))
  80                                 .findFirst();
  81         Asserts.assertTrue(heapSummaryEvent.isPresent(), "No heapSummary for gcId=" + gcId);
  82         System.out.println("Found heapSummaryEvent: " + heapSummaryEvent.get());
  83 
  84         Events.assertField(heapSummaryEvent.get(), "heapUsed").atLeast(0L).getValue();
  85         ObjectCountEventVerifier.verify(objCountEvents);
  86     }
  87 
  88     private static boolean isGcId(RecordedEvent event, int gcId) {
  89         return gcId == (int)Events.assertField(event, "gcId").getValue();
  90     }
  91 
  92     private static boolean isMySystemGc(RecordedEvent event, String gcName) {
  93         return Events.isEventType(event, gcEventPath) &&
  94             gcName.equals(Events.assertField(event, "name").getValue()) &&
  95             "System.gc()".equals(Events.assertField(event, "cause").getValue());
  96     }
  97 
  98 }