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/*
* Copyright (c) 2014, 2024, 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.
*
* 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 gc.g1.unloading;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.management.*;
import java.util.Collection;
import java.util.List;
import java.util.Random;
import java.util.concurrent.atomic.AtomicLong;
import gc.g1.unloading.check.Assertion;
import gc.g1.unloading.check.AssertionContainer;
import gc.g1.unloading.check.ClassAssertion;
import gc.g1.unloading.configuration.*;
import gc.g1.unloading.loading.*;
import nsk.share.gc.GCTestBase;
import nsk.share.test.ExecutionController;
import nsk.share.test.Stresser;
import nsk.share.test.Tests;
import jtreg.SkippedException;
/**
* This class contains main method. It's entry point for all configurations.
*
*/
public class UnloadingTest extends GCTestBase {
private static String[] args;
private TestConfiguration configuration;
private AssertionContainer assertionContainer = new AssertionContainer();
private Random random;
private static final String classNamePrefix = "ClassAbc_";
private static final long DELAY = 300;
private static AtomicLong systemGcCallsCounter = new AtomicLong(0);
public static void main(String[] args) {
UnloadingTest.args = args;
Tests.runTest(new UnloadingTest(), args);
}
@Override
public void run() {
configuration = TestConfiguration.createTestConfiguration(args);
checkIfG1Used();
checkFlags();
ExecutionController stresser = new Stresser(args);
stresser.start(1);
Thread.setDefaultUncaughtExceptionHandler(new UncaughtExceptionHandler() {
@Override
public void uncaughtException(Thread t, Throwable e) {
System.out.println("Throwable \"" + e + "\" in thread " + t.getName() + ", id=" + t.getId());
e.printStackTrace();
try {
checkGCCounters();
} catch (Throwable thr) {
thr.printStackTrace();
}
System.exit(2);
}
});
random = new Random(runParams.getSeed());
ClassLoadingHelper classLoadingHelper = new ClassLoadingHelper(stresser, random.nextLong(), configuration);
int classesCounter = 0;
while (stresser.continueExecution()) {
Collection<Assertion> assertions = null;
String className = classNamePrefix + (classesCounter++);
try {
Thread.sleep(DELAY);
} catch (InterruptedException | IllegalArgumentException e) {
throw new RuntimeException("Something went wrong in ClassLoadingHelper", e);
}
if (random.nextBoolean()) {
assertions = classLoadingHelper.loadClassThatGonnaDie(className);
} else {
assertions = classLoadingHelper.loadClassThatGonnaLive(className);
}
System.gc();
long systemGCCalls = systemGcCallsCounter.incrementAndGet();
assertionContainer.enqueue(assertions, systemGCCalls);
check(assertionContainer.getElder(systemGCCalls - configuration.getNumberOfGCsBeforeCheck()));
if (configuration.getNumberOfChecksLimit() >= 0 &&
ClassAssertion.getCounterOfCheckedAlive() >= configuration.getNumberOfChecksLimit() &&
ClassAssertion.getCounterOfCheckedUnloaded() >= configuration.getNumberOfChecksLimit()) {
System.out.println("Exiting because numberOfChecksLimit exceeded.");
stresser.finish();
break;
}
}
System.out.println("ClassAssertion.getCounterOfCheckedAlive() = " + ClassAssertion.getCounterOfCheckedAlive());
System.out.println("ClassAssertion.getCounterOfCheckedUnloaded() = " + ClassAssertion.getCounterOfCheckedUnloaded());
// Passing -XX:-MethodFlushing prevents Full GCs in Loom that subvert the tests.
checkGCCounters();
if (System.getProperty("FailTestIfNothingChecked") != null) {
if (ClassAssertion.getCounterOfCheckedAlive() == 0 || ClassAssertion.getCounterOfCheckedUnloaded() == 0) {
throw new RuntimeException("Test was useless. Smthng not checked: " + ClassAssertion.getCounterOfCheckedAlive() + " " +
ClassAssertion.getCounterOfCheckedUnloaded());
}
}
}
private void check(Collection<Assertion> assertions) {
if (assertions.isEmpty()) {
return;
}
for (Assertion assertion : assertions) {
assertion.check();
assertion.cleanup();
}
}
private static void checkGCCounters() {
GarbageCollectorMXBean oldGenBean = null;
for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
System.out.println("bean.getName() = \t\"" + bean.getName() + "\", bean.getCollectionCount() = \t" + bean.getCollectionCount());
if (bean.getName().contains("Old")) {
oldGenBean = bean;
}
}
if (oldGenBean != null && oldGenBean.getCollectionCount() != 0) {
throw new SkippedException("Full gc happened, skip the test.");
}
}
private void checkIfG1Used() {
for (GarbageCollectorMXBean bean : ManagementFactory.getGarbageCollectorMXBeans()) {
if (!bean.getName().contains("G1")) {
throw new SkippedException("This test was created to cover G1 class unloading feature. It should be ran with -XX:+UseG1GC");
}
}
}
private void checkFlags() {
RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
List<String> arguments = runtimeMxBean.getInputArguments();
for (String argument : arguments) {
if (argument.contains("ExplicitGCInvokesConcurrent")) {
return;
}
}
throw new RuntimeException("This test supposed to be ran with -XX:+ExplicitGCInvokesConcurrent flag");
}
}
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