1 /*

     2  * Copyright (c) 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 

    26 package jdk.jfr.jvm;

    27 

    28 import jdk.jfr.Event;

    29 import jdk.jfr.internal.JVM;

    30 

    31 import java.util.List;

    32 

    33 /*

    34  * @test TestGetAllEventClasses

    35  * @key jfr

    36  * @library /test/lib /test/jdk

    37  * @modules jdk.jfr/jdk.jfr.internal

    38  *

    39  * @build jdk.jfr.jvm.HelloWorldEvent1

    40  * @build jdk.jfr.jvm.HelloWorldEvent2

    41  * @run main/othervm jdk.jfr.jvm.TestGetAllEventClasses

    42  */

    43 public class TestGetAllEventClasses {

    44 

    45     public static void main(String... args) throws ClassNotFoundException {

    46         JVM jvm = JVM.getJVM();

    47         // before creating  native

    48         assertEmptyEventList(jvm);

    49         jvm.createNativeJFR();

    50         // after creating native

    51         assertEmptyEventList(jvm);

    52 

    53         // Test event class load is triggered and only once

    54         Class<? extends Event> clazz = initialize("jdk.jfr.jvm.HelloWorldEvent1");

    55         // check that the event class is registered

    56         assertEventsIncluded(jvm, clazz);

    57         // second active use of the same event class should not add another class

    58         // to the list - it would already be loaded

    59         clazz = initialize(clazz);

    60         assertEventsIncluded(jvm, clazz);

    61 

    62         // second event class

    63         Class<? extends Event> clazz2 = initialize("jdk.jfr.jvm.HelloWorldEvent2");

    64         // the list of event classes should now have two classes registered

    65         assertEventsIncluded(jvm, clazz, clazz2);

    66 

    67         // verify that an abstract event class is not included

    68         Class<? extends Event> abstractClass = initialize(MyAbstractEvent.class); // to run <clinit>

    69         assertEventsExcluded(jvm, abstractClass);

    70 

    71         // verify that a class that is yet to run its <clinit> is not included in the list of event classes

    72         assertEventsExcluded(jvm, MyUnInitializedEvent.class);

    73 

    74         // ensure old classes are not lost

    75         assertEventsIncluded(jvm, clazz, clazz2);

    76 

    77         jvm.destroyNativeJFR();

    78     }

    79 

    80     private static Class<? extends Event> initialize(String name) throws ClassNotFoundException {

    81         // Class.forName() will force the class to run its <clinit> method

    82         return Class.forName(name).asSubclass(Event.class);

    83     }

    84 

    85     private static Class<? extends Event> initialize(Class<? extends Event> event) throws ClassNotFoundException {

    86         return initialize(event.getName());

    87     }

    88 

    89     private static void assertEmptyEventList(JVM jvm) {

    90         if (!jvm.getAllEventClasses().isEmpty()) {

    91             throw new AssertionError("should not have any event classes registered!");

    92         }

    93     }

    94 

    95     @SafeVarargs

    96     private static void assertEventsExcluded(JVM jvm, Class<? extends Event>... targetEvents) {

    97         assertEvents(jvm, false, targetEvents);

    98     }

    99 

   100     @SafeVarargs

   101     private static void assertEventsIncluded(JVM jvm, Class<? extends Event>... targetEvents) {

   102         assertEvents(jvm, true, targetEvents);

   103     }

   104 

   105     @SafeVarargs

   106     private static void assertEvents(JVM jvm, boolean inclusion, Class<? extends Event>... targetEvents) {

   107         final List<Class<? extends Event>> list = jvm.getAllEventClasses();

   108         for (Class<? extends Event> ev : targetEvents) {

   109            if (list.contains(ev)) {

   110                if (inclusion) {

   111                    continue;

   112                }

   113                throw new AssertionError(ev.getName() + " in list but should not be!");

   114            }

   115            if (!inclusion) {

   116                continue;

   117            }

   118            throw new AssertionError(ev.getName() + " in not in list but should be!");

   119        }

   120     }

   121 

   122     private static abstract class MyAbstractEvent extends Event {}

   123     private static class MyUnInitializedEvent extends Event {}

   124 }