--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/jdk/jfr/event/runtime/TestClassLoadingStatisticsEvent.java Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,141 @@
+/*
+ * Copyright (c) 2013, 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.event.runtime;
+
+import java.util.List;
+
+import jdk.jfr.Recording;
+import jdk.jfr.consumer.RecordedEvent;
+import jdk.test.lib.Asserts;
+import jdk.test.lib.jfr.EventNames;
+import jdk.test.lib.jfr.Events;
+import jdk.test.lib.jfr.TestClassLoader;
+
+/*
+ * @test
+ * @key jfr
+ * @library /test/lib /test/jdk
+ * @build jdk.jfr.event.runtime.TestClasses
+ * @run main/othervm jdk.jfr.event.runtime.TestClassLoadingStatisticsEvent
+ */
+/**
+ * This test will load a number of classes. After each load step we verify that
+ * the loadedClassCount and unloadedClassCount attributes are correct.
+ *
+ * System.gc() will trigger class unloading if -XX:+ExplicitGCInvokesConcurrent
+ * is NOT set. If this flag is set G1 will never unload classes on System.gc()
+ * and CMS will not guarantee that all semantically dead classes will be
+ * unloaded. As far as the "jfr" key guarantees no VM flags are set from the
+ * outside it should be enough with System.gc().
+ */
+public class TestClassLoadingStatisticsEvent {
+
+ private final static String EVENT_PATH = EventNames.ClassLoadingStatistics;
+ private final static String TESTCLASS_PUBLIC_STATIC =
+ "jdk.jfr.event.runtime.TestClasses$TestClassPublicStatic";
+ private final static String TESTCLASS_PUBLIC_STATIC_INNER =
+ "jdk.jfr.event.runtime.TestClasses$TestClassPublicStatic$TestClassPublicStaticInner";
+
+ // Declare unloadableClassLoader as "public static"
+ // to prevent the compiler to optimize away all unread writes
+ public static TestClassLoader unloadableClassLoader;
+
+ public static void main(String[] args) throws Throwable {
+ // Load twice to get more stable result.
+ RecordedEvent event = getCurrentEvent();
+ event = getCurrentEvent();
+
+ // Declare class ClassLoadingStatisticsHelper.
+ TestClasses[] helpers = new TestClasses[10];
+ event = verifyCountDelta(event, 1, 0);
+
+ // Should load classes TestClassPrivate and TestClassPrivateStatic.
+ for (int c = 0; c < helpers.length; c++) {
+ helpers[c] = new TestClasses();
+ }
+ event = verifyCountDelta(event, 2, 0);
+
+ // Load classes TestClassProtected and B2.
+ helpers[0].new TestClassProtected();
+ helpers[1].new TestClassProtected(); // This class is already loaded.
+ new TestClasses.TestClassProtectedStatic();
+ event = verifyCountDelta(event, 2, 0);
+
+ // Load classes TestClassProtected1 and TestClassProtectedStatic1.
+ for (int c = 0; c < helpers.length; c++) {
+ helpers[c].loadClasses();
+ }
+ event = verifyCountDelta(event, 2, 0);
+
+ // Load the classes with separate class loader. Will be unloaded later.
+ unloadableClassLoader = new TestClassLoader();
+
+ unloadableClassLoader.loadClass(TESTCLASS_PUBLIC_STATIC_INNER);
+ event = verifyCountDelta(event, 1, 0);
+
+ unloadableClassLoader.loadClass(TESTCLASS_PUBLIC_STATIC);
+ event = verifyCountDelta(event, 1, 0);
+
+ // This System.gc() should not unload classes, since the
+ // unloadableClassLoader object is still active.
+ System.gc();
+ event = verifyCountDelta(event, 0, 0);
+
+ // make classes are unloaded.
+ unloadableClassLoader = null;
+ System.gc();
+ event = verifyCountDelta(event, 0, 2);
+ }
+
+ private static RecordedEvent getCurrentEvent() throws Throwable {
+ Recording recording = new Recording();
+ recording.enable(EVENT_PATH);
+ recording.start();
+ recording.stop();
+ List<RecordedEvent> events = Events.fromRecording(recording);
+ Asserts.assertFalse(events.isEmpty(), "No events in recording");
+ RecordedEvent event = events.get(0);
+ return event;
+ }
+
+ private static RecordedEvent verifyCountDelta(
+ RecordedEvent prevEvent, int loadDelta, int unloadDelta) throws Throwable {
+ RecordedEvent currEvent = null;
+ try {
+ long prevLoad = Events.assertField(prevEvent, "loadedClassCount").getValue();
+ long prevUnload = Events.assertField(prevEvent, "unloadedClassCount").getValue();
+
+ currEvent = getCurrentEvent();
+ Events.assertField(currEvent, "loadedClassCount").atLeast(prevLoad + loadDelta);
+ Events.assertField(currEvent, "unloadedClassCount").atLeast(prevUnload + unloadDelta);
+ return currEvent;
+ } catch (Throwable t) {
+ System.out.println("verifyCountDelta failed. prevEvent=" + prevEvent + ", currEvent=" + currEvent);
+ throw t;
+ }
+ }
+
+}