--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/jdk/jfr/api/metadata/eventtype/TestUnloadingEventClass.java Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,180 @@
+/*
+ * 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.api.metadata.eventtype;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import jdk.jfr.Event;
+import jdk.jfr.EventType;
+import jdk.jfr.FlightRecorder;
+import jdk.jfr.Recording;
+import jdk.jfr.consumer.RecordingFile;
+import jdk.jfr.internal.JVM;
+
+/*
+ * @test
+ * @key jfr
+ * @summary Test that verifies event metadata is removed when an event class is unloaded.
+ *
+ * @library /test/lib
+ * @modules jdk.jfr/jdk.jfr.internal
+ * java.base/jdk.internal.misc
+ *
+ * @run main/othervm -Xlog:class+unload -Xlog:gc jdk.jfr.api.metadata.eventtype.TestUnloadingEventClass
+ */
+public class TestUnloadingEventClass {
+
+ private static final String EVENT_NAME = "jdk.jfr.api.metadata.eventtype.TestUnloadingEventClass$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);
+ }
+ }
+
+ private static final JVM jvm = JVM.getJVM();
+ public static ClassLoader myClassLoader;
+
+ public static void main(String[] args) throws Throwable {
+ assertEventTypeNotAvailable();
+ myClassLoader = createClassLoaderWithEventClass();
+
+ try (Recording r0 = new Recording()) {
+ r0.start();
+ r0.stop();
+ if (getEventType(r0, 0, EVENT_NAME) == null) {
+ throw new Exception("Expected event class to have corresponding event type");
+ }
+ }
+
+ try (Recording r1 = new Recording(); Recording r2 = new Recording(); Recording r3 = new Recording()) {
+ r1.start();
+ r2.start();
+ System.out.println("Class loader with name " + myClassLoader.getName() + " is on the heap");
+ unLoadEventClass();
+ r3.start();
+
+ assertEventTypeNotAvailable();
+ r3.stop();
+ r2.stop();
+ r1.stop();
+
+ if (getEventType(r1, 1, EVENT_NAME) == null) {
+ throw new Exception("Expected event class to have corresponding event type in recording with all chunks");
+ }
+ if (getEventType(r2, 2, EVENT_NAME) == null) {
+ throw new Exception("Expected event class to have corresponding event type in recording where event class was unloaded");
+ }
+ if (getEventType(r3, 3, EVENT_NAME) != null) {
+ throw new Exception("Unexpected metadata found for event class tha has been unloaded.");
+ }
+ }
+ }
+
+ private static MyClassLoader createClassLoaderWithEventClass() throws Exception {
+ String resourceName = EVENT_NAME.replace('.', '/') + ".class";
+ try (InputStream is = TestUnloadingEventClass.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;
+ }
+ }
+
+ private static void unLoadEventClass() throws Exception {
+ long firstCount = jvm.getUnloadedEventClassCount();
+ System.out.println("Initial unloaded count: " + firstCount);
+ myClassLoader = null;
+ System.out.println("Cleared reference to MyClassLoader");
+ long newCount = 0;
+ do {
+ System.out.println("GC triggered");
+ System.gc();
+ Thread.sleep(1000);
+ newCount = jvm.getUnloadedEventClassCount();
+ System.out.println("Unloaded count: " + newCount);
+ } while (firstCount + 1 != newCount);
+ System.out.println("Event class unloaded!");
+ System.out.println("Event classes currently on the heap:");
+ for (Class<?> eventClass : JVM.getJVM().getAllEventClasses()) {
+ System.out.println(eventClass + " " + (eventClass.getClassLoader() != null ? eventClass.getClassLoader().getName() : null));
+ }
+
+ }
+
+ private static void assertEventTypeNotAvailable() throws Exception {
+ for (EventType type : FlightRecorder.getFlightRecorder().getEventTypes()) {
+ if (type.getName().equals(EVENT_NAME)) {
+ throw new Exception("Event type should not be available");
+ }
+ }
+ }
+
+ private static Object getEventType(Recording r, long id, String eventName) throws IOException {
+ Path p = Files.createTempFile("recording-" + id + "_", ".jfr");
+ r.dump(p);
+ try (RecordingFile rf = new RecordingFile(p)) {
+ for (EventType et : rf.readEventTypes()) {
+ if (et.getName().equals(eventName)) {
+ return et;
+ }
+ }
+
+ }
+ return null;
+ }
+}
+