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 static jdk.test.lib.Asserts.assertGreaterThan;
  29 import static jdk.test.lib.Asserts.assertNE;
  30 
  31 import jdk.jfr.internal.JVM;
  32 import jdk.jfr.internal.Type;
  33 
  34 /**
  35  * @test TestClassId
  36  * @key jfr
  37  * @requires vm.hasJFR
  38  * @library /test/lib
  39  * @modules jdk.jfr/jdk.jfr.internal
  40  * @run main/othervm jdk.jfr.jvm.TestClassId
  41  */
  42 public class TestClassId {
  43 
  44     public static void main(String... args) {
  45         assertClassIds();
  46         JVM jvm = JVM.getJVM();
  47         jvm.createNativeJFR();
  48         assertClassIds();
  49         jvm.destroyNativeJFR();
  50         assertClassIds();
  51     }
  52 
  53     private static void assertClassIds() {
  54         long doubleClassId = Type.getTypeId(Double.class);
  55         assertGreaterThan(doubleClassId, 0L, "Class id must be greater than 0");
  56 
  57         long floatClassId = Type.getTypeId(Float.class);
  58         assertNE(doubleClassId, floatClassId, "Different classes must have different class ids");
  59     }
  60 }