/*
* Copyright (c) 2015, 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.
*/
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.Phaser;
import java.util.concurrent.Semaphore;
import java.util.logging.Handler;
import java.util.logging.LogManager;
import java.util.logging.Logger;
/**
* @test
* @bug 7113878
* @summary This is not a test that will check that 7113878 is fixed, but
* rather a test that will invoke the modified code & try to verify
* that fixing 7113878 has not introduced some big regression.
* This test should pass, whether 7113878 is there or not.
* @run main/othervm TestLoggerNames
* @author danielfuchs
*/
public class TestLoggerNames {
static final class TestLogger extends java.util.logging.Logger {
final Semaphore sem = new Semaphore(0);
final Semaphore wait = new Semaphore(0);
public TestLogger(String name, String resourceBundleName) {
super(name, resourceBundleName);
}
@Override
public Handler[] getHandlers() {
boolean found = false;
try {
System.out.println("Entering "+getName()+" getHandlers()");
for (StackTraceElement ste : Thread.currentThread().getStackTrace()) {
if (LogManager.class.getName().equals(ste.getClassName())
&& "reset".equals(ste.getMethodName())) {
found = true;
System.out.println(getName()+" getHandlers() called by " + ste);
}
}
sem.release();
try {
System.out.println("TestLogger: Acquiring wait for "+getName());
wait.acquire();
try {
System.out.println("TestLogger: Acquired wait for "+getName());
return super.getHandlers();
} finally {
System.out.println("TestLogger: Releasing wait for "+getName());
wait.release();
}
} finally {
System.out.println("Unblocking "+getName());
sem.acquire();
System.out.println("Unblocked "+getName());
if (found) {
System.out.println("Reset will proceed...");
}
}
} catch (InterruptedException x) {
throw new IllegalStateException(x);
}
}
}
static volatile boolean stop;
static volatile Throwable resetFailed;
static volatile Throwable checkLoggerNamesFailed;
static volatile Phaser phaser = new Phaser(2);
static void checkLoggerNames(List<Logger> loggers) {
Enumeration<String> names = LogManager.getLogManager().getLoggerNames();
if (names instanceof Iterator) {
for (Iterator<?> it = Iterator.class.cast(names); it.hasNext(); ) {
try {
it.remove();
throw new RuntimeException("Iterator supports remove!");
} catch (UnsupportedOperationException x) {
System.out.println("OK: Iterator doesn't support remove.");
}
}
// We're not supposed to come here, but if we do then we
// need to rewind names...
names = LogManager.getLogManager().getLoggerNames();
}
List<String> loggerNames = Collections.list(names);
if (!loggerNames.contains("")) {
throw new RuntimeException("\"\"" +
" not found in " + loggerNames);
}
if (!loggerNames.contains("global")) {
throw new RuntimeException("global" +
" not found in " + loggerNames);
}
for (Logger l : loggers) {
if (!loggerNames.contains(l.getName())) {
throw new RuntimeException(l.getName() +
" not found in " + loggerNames);
}
}
System.out.println("Got all expected logger names");
}
public static void main(String[] args) throws InterruptedException {
LogManager.getLogManager().addLogger(new TestLogger("com.foo.bar.zzz", null));
try {
Logger.getLogger(null);
throw new RuntimeException("Logger.getLogger(null) didn't throw expected NPE");
} catch (NullPointerException x) {
System.out.println("Got expected NullPointerException for Logger.getLogger(null)");
}
List<Logger> loggers = new CopyOnWriteArrayList<>();
loggers.add(Logger.getLogger("one.two.addMeAChild"));
loggers.add(Logger.getLogger("aaa.bbb.replaceMe"));
loggers.add(Logger.getLogger("bbb.aaa.addMeAChild"));
TestLogger test = (TestLogger)Logger.getLogger("com.foo.bar.zzz");
loggers.add(Logger.getLogger("ddd.aaa.addMeAChild"));
checkLoggerNames(loggers);
Thread loggerNamesThread = new Thread(() -> {
try {
while (!stop) {
// Make a defensive copy of the list of loggers that we pass
// to checkLoggerNames - in order to make sure that
// we won't see new loggers that might appear after
// checkLoggerNames has called LogManager.getLoggerNames().
// ('loggers' is a live list and the main thread adds and
// and removes loggers from it concurrently to this thread).
checkLoggerNames(new ArrayList<>(loggers));
Thread.sleep(10);
if (!stop) {
phaser.arriveAndAwaitAdvance();
}
}
} catch (Throwable t) {
t.printStackTrace(System.err);
checkLoggerNamesFailed = t;
// makes sure the main thread isn't going to wait
// forever waiting for this dead thread to arrive at the
// phaser.
phaser.arrive();
}
}, "loggerNames");
Thread resetThread = new Thread(() -> {
try {
System.out.println("Calling reset...");
LogManager.getLogManager().reset();
System.out.println("Reset done...");
System.out.println("Reset again...");
LogManager.getLogManager().reset();
System.out.println("Reset done...");
} catch(Throwable t) {
resetFailed = t;
System.err.println("Unexpected exception or error in reset Thread");
t.printStackTrace(System.err);
}
}, "reset");
resetThread.setDaemon(true);
resetThread.start();
System.out.println("Waiting for reset to get handlers");
test.sem.acquire();
try {
loggerNamesThread.start();
System.out.println("Reset has called getHandlers on " + test.getName());
int i = 0;
for (Enumeration<String> e = LogManager.getLogManager().getLoggerNames();
e.hasMoreElements();) {
String name = e.nextElement();
if (name.isEmpty()) continue;
if (name.endsWith(".addMeAChild")) {
Logger l = Logger.getLogger(name+".child");
loggers.add(l);
System.out.println("*** Added " + l.getName());
i++;
} else if (name.endsWith("replaceMe")) {
Logger l = Logger.getLogger(name);
loggers.remove(l);
l = Logger.getLogger(name.replace("replaceMe", "meReplaced"));
loggers.add(l);
// Give some chance to the loggerNames thread to arrive at the
// phaser first. We don't really care if the logger is actually
// replaced this turn - or the next.
Thread.sleep(100);
System.gc();
if (LogManager.getLogManager().getLogger(name) == null) {
// The original logger may not have been gc'ed yet, since
// it could still be referenced by the list being processed
// by the loggerNamesThread, if that thread hasn't arrived
// to the phaser yet...
System.out.println("*** "+ name
+ " successfully replaced with " + l.getName());
}
i++;
} else {
System.out.println("Nothing to do for logger: " + name);
}
if (checkLoggerNamesFailed != null) {
// The checkLoggerNames thread failed. No need to
// continue.
break;
}
// Waits for the checkLoggerNamesThread to arrive
phaser.arriveAndAwaitAdvance();
if (i >= 3 && i++ == 3) {
System.out.println("Loggers are now: " +
Collections.list(LogManager.getLogManager().getLoggerNames()));
test.wait.release();
test.sem.release();
System.out.println("Joining " + resetThread);
resetThread.join();
}
}
} catch (RuntimeException | InterruptedException | Error x) {
test.wait.release();
test.sem.release();
throw x;
} finally {
stop = true;
phaser.arriveAndDeregister();
loggerNamesThread.join();
loggers.clear();
}
if (resetFailed != null || checkLoggerNamesFailed != null) {
RuntimeException r = new RuntimeException("Some of the concurrent threads failed");
if (resetFailed != null) r.addSuppressed(resetFailed);
if (checkLoggerNamesFailed != null) r.addSuppressed(checkLoggerNamesFailed);
throw r;
}
}
}