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import java.util.concurrent.ForkJoinPool; |
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import java.util.concurrent.ForkJoinTask; |
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import java.util.concurrent.Future; |
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+ |
import java.util.concurrent.ThreadLocalRandom; |
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import java.util.stream.Stream; |
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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.findVarHandle(Thread.class, "contextClassLoader", ClassLoader.class); |
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ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader(); |
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boolean haveSecurityManager = (System.getSecurityManager() != null); |
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CountDownLatch taskStarted = new CountDownLatch(1); |
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CountDownLatch runInCommonPoolStarted = new CountDownLatch(1); |
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ClassLoader classLoaderDistinctFromSystemClassLoader |
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= ClassLoader.getPlatformClassLoader(); |
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assertNotSame(classLoaderDistinctFromSystemClassLoader, |
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systemClassLoader); |
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Runnable runInCommonPool = () -> { |
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taskStarted.countDown(); |
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runInCommonPoolStarted.countDown(); |
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assertTrue(ForkJoinTask.inForkJoinPool()); |
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< |
assertSame(ForkJoinPool.commonPool(), |
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< |
ForkJoinTask.getPool()); |
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< |
assertSame(systemClassLoader, |
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Thread.currentThread().getContextClassLoader()); |
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< |
assertSame(systemClassLoader, |
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CCL.get(Thread.currentThread())); |
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assertSame(ForkJoinPool.commonPool(), ForkJoinTask.getPool()); |
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Thread currentThread = Thread.currentThread(); |
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> |
|
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> |
Stream.of(systemClassLoader, null).forEach(cl -> { |
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if (ThreadLocalRandom.current().nextBoolean()) |
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> |
// should always be permitted, without effect |
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> |
currentThread.setContextClassLoader(cl); |
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> |
}); |
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> |
|
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Stream.of(currentThread.getContextClassLoader(), |
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> |
(ClassLoader) CCL.get(currentThread)) |
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> |
.forEach(cl -> assertTrue(cl == systemClassLoader || cl == null)); |
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> |
|
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if (haveSecurityManager) |
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assertThrows( |
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SecurityException.class, |
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() -> System.getProperty("foo"), |
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< |
() -> Thread.currentThread().setContextClassLoader( |
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> |
() -> currentThread.setContextClassLoader( |
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classLoaderDistinctFromSystemClassLoader)); |
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// TODO ? |
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// if (haveSecurityManager |
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Future<?> f = ForkJoinPool.commonPool().submit(runInCommonPool); |
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// Ensure runInCommonPool is truly running in the common pool, |
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// by giving this thread no opportunity to "help" on get(). |
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< |
await(taskStarted); |
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> |
await(runInCommonPoolStarted); |
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assertNull(f.get()); |
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} |
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