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/* ConcurrentLogging.java -- Test Concurrent access to Logger
Copyright (C) 2008 Mario Torre <neugens@limasoftware.net>
This file is part of Mauve.
Mauve is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
Mauve 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 for more details.
You should have received a copy of the GNU General Public License
along with Mauve; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
*/
// Tags: JDK1.4
package gnu.testlet.java.util.logging.Logger;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
import gnu.testlet.TestHarness;
import gnu.testlet.Testlet;
/**
* Fix PR35974, when multiple threads try to access methods or Logger.
*
* @author Mario Torre <neugens@limasoftware.net>
*/
public class PR35974
implements Testlet
{
private static final boolean DEBUG = false;
private static Logger parentLogger =
Logger.getLogger("new caprica event logger");
private TestHarness harness = null;
static volatile boolean fighting = true;
public void test(TestHarness harness)
{
this.harness = harness;
HarnessHandler handler = new HarnessHandler();
LoggerThread galactica = new LoggerThread("Galactica", handler);
LoggerThread cylonBasestar1 =
new LoggerThread("Cylon Basestar #1", handler);
LoggerThread cylonBasestar2 =
new LoggerThread("Cylon Basestar #2", handler);
LoggerThread cylonBasestar3 =
new LoggerThread("Cylon Basestar #3", handler);
galactica.start();
cylonBasestar1.start();
cylonBasestar2.start();
cylonBasestar3.start();
BattlestarPegasusThread pegasus = new BattlestarPegasusThread();
pegasus.start();
}
private class HarnessHandler extends Handler
{
public void close() throws SecurityException
{
/* does nothing */
}
@Override
public void flush()
{
/* does nothing */
}
public void success()
{
harness.check(true, Thread.currentThread().getName());
}
@Override
public void publish(LogRecord record)
{
if (DEBUG == false)
return;
// this is not correct in real world code, but it's ok for our
// simple test
if (Thread.currentThread().getName().equalsIgnoreCase("Galactica"))
harness.debug(record.getMessage() + "--------------------------->");
else
harness.debug("\t\t\t\t\t\t\t\t\t\t\t\t\t<---------------------------"
+ record.getMessage());
}
}
private static class BattlestarPegasusThread extends Thread
{
private long startTime = System.currentTimeMillis();
public BattlestarPegasusThread()
{
super("Pegasus to the rescue...");
}
@Override
public void run()
{
parentLogger.log(Level.INFO, this.getName());
long stopTime = System.currentTimeMillis();
while ((stopTime - startTime) < 30000)
{
stopTime = System.currentTimeMillis();
}
fighting = false;
parentLogger.log(Level.INFO, "Pegasus destroyed...");
}
}
private static class LoggerThread extends Thread
{
private static Logger brokenLogger = null;
private HarnessHandler handler = null;
public LoggerThread(String name, HarnessHandler handler)
{
super(name);
super.setDaemon(true);
this.handler = handler;
}
@Override
public void run()
{
parentLogger.log(Level.INFO, this.getName() +
" did the jump into new caprica orbit ");
while (fighting)
{
// These methods are all synchronized in the implementation.
// Of course, you see the problem, there is no synchronization
// between the first instruction and the others, and you can see
// this because some output from the logger is still left on even when
// we setLevel(Level.OFF), this is because of some concurrent access,
// but it's ok, because what we do here is to force a concurrent
// access somehow hoping for a deadlock at some point, which will
// not happen because the locking system on the Logger class has been
// improved, but still will left our brokenLogger in a somewhat
// confused state (that is, it works only because handler and
// parentLogger are always the same, otherwise it would not work)
// This code is broken by design, so don't try to imitate this style
// in real word code, please.
brokenLogger = Logger.getLogger(this.getName());
if (DEBUG == false)
brokenLogger.setLevel(Level.OFF);
else
brokenLogger.setParent(parentLogger);
brokenLogger.addHandler(handler);
brokenLogger.log(Level.INFO, this.getName() + " fires");
}
parentLogger.log(Level.INFO, this.getName() + " jumps");
handler.success();
}
}
}
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