//=============================================================================
// Copyright 2006-2010 Daniel W. Dyer
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//=============================================================================
package org.uncommons.util.concurrent;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
import org.testng.annotations.Test;
/**
* Unit test for the general-purpose thread factory implementation.
* @author Daniel Dyer
*/
public class ConfigurableThreadFactoryTest
{
@Test
public void testDaemonThreads()
{
ThreadFactory threadFactory = new ConfigurableThreadFactory("Test",
Thread.MIN_PRIORITY,
true);
Runnable doNothing = new Runnable()
{
public void run()
{
// Do nothing.
}
};
Thread thread1 = threadFactory.newThread(doNothing);
assert thread1.getName().startsWith("Test") : "Wrong thread name: " + thread1.getName();
assert thread1.getPriority() == Thread.MIN_PRIORITY : "Wrong priority: " + thread1.getPriority();
assert thread1.isDaemon() : "Thread should be a daemon.";
// Second thread should have a different name.
Thread thread2 = threadFactory.newThread(doNothing);
assert thread2.getName().startsWith("Test") : "Wrong thread name: " + thread2.getName();
assert !thread1.getName().equals(thread2.getName()) : "Thread names should be different.";
}
@Test
public void testNonDaemonThreads()
{
ThreadFactory threadFactory = new ConfigurableThreadFactory("Test",
Thread.MAX_PRIORITY,
false);
Runnable doNothing = new Runnable()
{
public void run()
{
// Do nothing.
}
};
Thread thread = threadFactory.newThread(doNothing);
assert thread.getName().startsWith("Test") : "Wrong thread name: " + thread.getName();
assert thread.getPriority() == Thread.MAX_PRIORITY : "Wrong priority: " + thread.getPriority();
assert !thread.isDaemon() : "Thread should not be a daemon.";
}
@Test
public void testDefaultExceptionHandler() throws InterruptedException
{
// Intercept std. err.
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
System.setErr(new PrintStream(byteStream));
ThreadFactory threadFactory = new ConfigurableThreadFactory("Test",
Thread.MAX_PRIORITY,
false);
Runnable doNothing = new Runnable()
{
public void run()
{
throw new IllegalStateException("This is a test.");
}
};
Thread thread = threadFactory.newThread(doNothing);
thread.start();
thread.join();
String output = byteStream.toString();
assert output.startsWith("java.lang.IllegalStateException") : "Exception handler failed to log exception.";
}
@Test
public void testCustomExceptionHandler() throws InterruptedException
{
ExceptionHandler exceptionHandler = new ExceptionHandler();
ThreadFactory threadFactory = new ConfigurableThreadFactory("Test",
Thread.MAX_PRIORITY,
false,
exceptionHandler);
Runnable doNothing = new Runnable()
{
public void run()
{
throw new IllegalStateException("This is a test.");
}
};
Thread thread = threadFactory.newThread(doNothing);
thread.start();
thread.join();
assert exceptionHandler.getExceptionCount() == 1 : "Exception not thrown.";
}
private static final class ExceptionHandler implements Thread.UncaughtExceptionHandler
{
private final AtomicInteger count = new AtomicInteger();
public void uncaughtException(Thread thread, Throwable throwable)
{
count.incrementAndGet();
}
public int getExceptionCount()
{
return count.get();
}
}
}