| /* |
| * 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; |
| } |
| } |
| |
| } |