--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/jdk/jfr/jvm/TestUnloadEventClassCount.java Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.jfr.jvm;
+
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+
+import jdk.jfr.Event;
+import jdk.jfr.FlightRecorder;
+import jdk.jfr.internal.JVM;
+
+/*
+ * @test
+ * @key jfr
+ * @summary Unit test for JVM#getUnloadedEventClassCount
+ *
+ * @library /test/lib
+ * @modules jdk.jfr/jdk.jfr.internal
+ * java.base/jdk.internal.misc
+ *
+ * @run main/othervm -Xlog:class+unload -Xlog:gc -Xmx16m jdk.jfr.jvm.TestUnloadEventClassCount
+ */
+public class TestUnloadEventClassCount {
+
+ private static final String EVENT_NAME = "jdk.jfr.jvm.TestUnloadEventClassCount$ToBeUnloaded";
+
+ public static class ToBeUnloaded extends Event {
+ }
+
+ static public class MyClassLoader extends ClassLoader {
+ public MyClassLoader() {
+ super("MyClassLoader", null);
+ }
+
+ public final Class<?> defineClass(String name, byte[] b) {
+ return super.defineClass(name, b, 0, b.length);
+ }
+ }
+
+ public static MyClassLoader myClassLoader;
+
+ public static void main(String[] args) throws Throwable {
+ FlightRecorder.getFlightRecorder();
+ myClassLoader = createClassLoaderWithEventClass();
+ System.out.println("MyClassLoader instance created");
+ long initialCount = JVM.getJVM().getUnloadedEventClassCount();
+ System.out.println("Initiali unloaded count is " + initialCount);
+ myClassLoader = null;
+ System.out.println("Reference to class loader cleared");
+ long count = 0;
+ do {
+ System.gc();
+ System.out.println("GC triggered");
+ count = JVM.getJVM().getUnloadedEventClassCount();
+ System.out.println("Unloaded count was " + count);
+ Thread.sleep(1000); // sleep to reduce log
+ } while (count != initialCount + 1);
+ }
+
+ private static MyClassLoader createClassLoaderWithEventClass() throws Exception {
+ String resourceName = EVENT_NAME.replace('.', '/') + ".class";
+ try (InputStream is = TestUnloadEventClassCount.class.getClassLoader().getResourceAsStream(resourceName)) {
+ ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ byte[] buffer = new byte[4096];
+ int byteValue = 0;
+ while ((byteValue = is.read(buffer, 0, buffer.length)) != -1) {
+ baos.write(buffer, 0, byteValue);
+ }
+ baos.flush();
+ MyClassLoader myClassLoader = new MyClassLoader();
+ Class<?> eventClass = myClassLoader.defineClass(EVENT_NAME, baos.toByteArray());
+ if (eventClass == null) {
+ throw new Exception("Could not define test class");
+ }
+ if (eventClass.getSuperclass() != Event.class) {
+ throw new Exception("Superclass should be jdk.jfr.Event");
+ }
+ if (eventClass.getSuperclass().getClassLoader() != null) {
+ throw new Exception("Class loader of jdk.jfr.Event should be null");
+ }
+ if (eventClass.getClassLoader() != myClassLoader) {
+ throw new Exception("Incorrect class loader for event class");
+ }
+ eventClass.newInstance(); // force <clinit>
+ return myClassLoader;
+ }
+ }
+}