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.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
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22  */
23 
24 package jdk.jfr.event.gc.objectcount;
25 
26 import java.util.List;
27 import java.util.HashMap;
28 
29 import jdk.jfr.consumer.RecordedEvent;
30 import jdk.test.lib.Asserts;
31 import jdk.test.lib.jfr.Events;
32 
33 class Foo {
34 }
35 
36 class Constants {
37     public static final int oneMB = 1048576;
38 }
39 
40 public class ObjectCountEventVerifier {
41     public static Foo[] foos;
42 
43     public static void createTestData() {
44         foos = new Foo[Constants.oneMB];
45     }
46 
47     public static void verify(List<RecordedEvent> objectCountEvents) throws Exception {
48         Asserts.assertFalse(objectCountEvents.isEmpty(), "Expected at least one object count event");
49         // Object count events should be sent only for those classes which instances occupy over 0.5%
50         // of the heap. Therefore there can't be more than 200 events
51         Asserts.assertLessThanOrEqual(objectCountEvents.size(), 200, "Expected at most 200 object count events");
52 
53         HashMap<String, Long> numInstancesOfClass = new HashMap<String, Long>();
54         HashMap<String, Long> sizeOfInstances = new HashMap<String, Long>();
55 
56         for (RecordedEvent event : objectCountEvents) {
57             String className = Events.assertField(event, "objectClass.name").notEmpty().getValue();
58             long count = Events.assertField(event, "count").atLeast(0L).getValue();
59             long totalSize = Events.assertField(event, "totalSize").atLeast(1L).getValue();
60             System.out.println(className);
61             numInstancesOfClass.put(className, count);
62             sizeOfInstances.put(className, totalSize);
63         }
64         System.out.println(numInstancesOfClass);
65         final String fooArrayName = "[Ljdk/jfr/event/gc/objectcount/Foo;";
66         Asserts.assertTrue(numInstancesOfClass.containsKey(fooArrayName), "Expected an event for the Foo array");
67         Asserts.assertEquals(sizeOfInstances.get(fooArrayName), expectedFooArraySize(Constants.oneMB), "Wrong size of the Foo array");
68     }
69 
70     private static long expectedFooArraySize(long count) {
71         boolean runsOn32Bit = System.getProperty("sun.arch.data.model").equals("32");
72         int bytesPerWord = runsOn32Bit ? 4 : 8;
73         // length will be in klass-gap on 64 bits, extra field on 32 bits.
74         int objectHeaderSize = bytesPerWord * (runsOn32Bit ? 3 : 2);
75         int alignmentInOopArray = runsOn32Bit ? 4 : 0;
76         int ptrSize = bytesPerWord;
77         return objectHeaderSize + alignmentInOopArray + count * ptrSize;
78     }
79 }