jsr166-mirror.jsr166tck.1.7.0.source-code.ForkJoinPoolTest Maven / Gradle / Ivy
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/*
* Written by Doug Lea with assistance from members of JCP JSR-166
* Expert Group and released to the public domain, as explained at
* http://creativecommons.org/publicdomain/zero/1.0/
*/
import junit.framework.*;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.CancellationException;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.ForkJoinTask;
import java.util.concurrent.ForkJoinWorkerThread;
import java.util.concurrent.RecursiveTask;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.security.AccessControlException;
import java.security.Policy;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
public class ForkJoinPoolTest extends JSR166TestCase {
public static void main(String[] args) {
junit.textui.TestRunner.run(suite());
}
public static Test suite() {
return new TestSuite(ForkJoinPoolTest.class);
}
/**
* Testing coverage notes:
*
* 1. shutdown and related methods are tested via super.joinPool.
*
* 2. newTaskFor and adapters are tested in submit/invoke tests
*
* 3. We cannot portably test monitoring methods such as
* getStealCount() since they rely ultimately on random task
* stealing that may cause tasks not to be stolen/propagated
* across threads, especially on uniprocessors.
*
* 4. There are no independently testable ForkJoinWorkerThread
* methods, but they are covered here and in task tests.
*/
// Some classes to test extension and factory methods
static class MyHandler implements Thread.UncaughtExceptionHandler {
volatile int catches = 0;
public void uncaughtException(Thread t, Throwable e) {
++catches;
}
}
// to test handlers
static class FailingFJWSubclass extends ForkJoinWorkerThread {
public FailingFJWSubclass(ForkJoinPool p) { super(p) ; }
protected void onStart() { super.onStart(); throw new Error(); }
}
static class FailingThreadFactory
implements ForkJoinPool.ForkJoinWorkerThreadFactory {
volatile int calls = 0;
public ForkJoinWorkerThread newThread(ForkJoinPool p) {
if (++calls > 1) return null;
return new FailingFJWSubclass(p);
}
}
static class SubFJP extends ForkJoinPool { // to expose protected
SubFJP() { super(1); }
public int drainTasksTo(Collection> c) {
return super.drainTasksTo(c);
}
public ForkJoinTask pollSubmission() {
return super.pollSubmission();
}
}
static class ManagedLocker implements ForkJoinPool.ManagedBlocker {
final ReentrantLock lock;
boolean hasLock = false;
ManagedLocker(ReentrantLock lock) { this.lock = lock; }
public boolean block() {
if (!hasLock)
lock.lock();
return true;
}
public boolean isReleasable() {
return hasLock || (hasLock = lock.tryLock());
}
}
// A simple recursive task for testing
static final class FibTask extends RecursiveTask {
final int number;
FibTask(int n) { number = n; }
public Integer compute() {
int n = number;
if (n <= 1)
return n;
FibTask f1 = new FibTask(n - 1);
f1.fork();
return (new FibTask(n - 2)).compute() + f1.join();
}
}
// A failing task for testing
static final class FailingTask extends ForkJoinTask {
public final Void getRawResult() { return null; }
protected final void setRawResult(Void mustBeNull) { }
protected final boolean exec() { throw new Error(); }
FailingTask() {}
}
// Fib needlessly using locking to test ManagedBlockers
static final class LockingFibTask extends RecursiveTask {
final int number;
final ManagedLocker locker;
final ReentrantLock lock;
LockingFibTask(int n, ManagedLocker locker, ReentrantLock lock) {
number = n;
this.locker = locker;
this.lock = lock;
}
public Integer compute() {
int n;
LockingFibTask f1 = null;
LockingFibTask f2 = null;
locker.block();
n = number;
if (n > 1) {
f1 = new LockingFibTask(n - 1, locker, lock);
f2 = new LockingFibTask(n - 2, locker, lock);
}
lock.unlock();
if (n <= 1)
return n;
else {
f1.fork();
return f2.compute() + f1.join();
}
}
}
/**
* Successfully constructed pool reports default factory,
* parallelism and async mode policies, no active threads or
* tasks, and quiescent running state.
*/
public void testDefaultInitialState() {
ForkJoinPool p = new ForkJoinPool(1);
try {
assertSame(ForkJoinPool.defaultForkJoinWorkerThreadFactory,
p.getFactory());
assertFalse(p.getAsyncMode());
assertEquals(0, p.getActiveThreadCount());
assertEquals(0, p.getStealCount());
assertEquals(0, p.getQueuedTaskCount());
assertEquals(0, p.getQueuedSubmissionCount());
assertFalse(p.hasQueuedSubmissions());
assertFalse(p.isShutdown());
assertFalse(p.isTerminating());
assertFalse(p.isTerminated());
} finally {
joinPool(p);
}
}
/**
* Constructor throws if size argument is less than zero
*/
public void testConstructor1() {
try {
new ForkJoinPool(-1);
shouldThrow();
} catch (IllegalArgumentException success) {}
}
/**
* Constructor throws if factory argument is null
*/
public void testConstructor2() {
try {
new ForkJoinPool(1, null, null, false);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* getParallelism returns size set in constructor
*/
public void testGetParallelism() {
ForkJoinPool p = new ForkJoinPool(1);
try {
assertEquals(1, p.getParallelism());
} finally {
joinPool(p);
}
}
/**
* getPoolSize returns number of started workers.
*/
public void testGetPoolSize() {
ForkJoinPool p = new ForkJoinPool(1);
try {
assertEquals(0, p.getActiveThreadCount());
Future future = p.submit(new StringTask());
assertEquals(1, p.getPoolSize());
} finally {
joinPool(p);
}
}
/**
* setUncaughtExceptionHandler changes handler for uncaught exceptions.
*
* Additionally tests: Overriding ForkJoinWorkerThread.onStart
* performs its defined action
*/
public void testSetUncaughtExceptionHandler() throws InterruptedException {
final CountDownLatch uehInvoked = new CountDownLatch(1);
final Thread.UncaughtExceptionHandler eh =
new Thread.UncaughtExceptionHandler() {
public void uncaughtException(Thread t, Throwable e) {
uehInvoked.countDown();
}};
ForkJoinPool p = new ForkJoinPool(1, new FailingThreadFactory(),
eh, false);
try {
assertSame(eh, p.getUncaughtExceptionHandler());
p.execute(new FibTask(8));
assertTrue(uehInvoked.await(MEDIUM_DELAY_MS, MILLISECONDS));
} finally {
p.shutdownNow(); // failure might have prevented processing task
joinPool(p);
}
}
/**
* After invoking a single task, isQuiescent is true,
* queues are empty, threads are not active, and
* construction parameters continue to hold
*/
public void testisQuiescent() throws InterruptedException {
ForkJoinPool p = new ForkJoinPool(2);
try {
assertTrue(p.isQuiescent());
p.invoke(new FibTask(20));
assertSame(ForkJoinPool.defaultForkJoinWorkerThreadFactory,
p.getFactory());
delay(SMALL_DELAY_MS);
assertTrue(p.isQuiescent());
assertFalse(p.getAsyncMode());
assertEquals(0, p.getActiveThreadCount());
assertEquals(0, p.getQueuedTaskCount());
assertEquals(0, p.getQueuedSubmissionCount());
assertFalse(p.hasQueuedSubmissions());
assertFalse(p.isShutdown());
assertFalse(p.isTerminating());
assertFalse(p.isTerminated());
} finally {
joinPool(p);
}
}
/**
* Completed submit(ForkJoinTask) returns result
*/
public void testSubmitForkJoinTask() throws Throwable {
ForkJoinPool p = new ForkJoinPool(1);
try {
ForkJoinTask f = p.submit(new FibTask(8));
assertEquals(21, (int) f.get());
} finally {
joinPool(p);
}
}
/**
* A task submitted after shutdown is rejected
*/
public void testSubmitAfterShutdown() {
ForkJoinPool p = new ForkJoinPool(1);
try {
p.shutdown();
assertTrue(p.isShutdown());
try {
ForkJoinTask f = p.submit(new FibTask(8));
shouldThrow();
} catch (RejectedExecutionException success) {}
} finally {
joinPool(p);
}
}
/**
* Pool maintains parallelism when using ManagedBlocker
*/
public void testBlockingForkJoinTask() throws Throwable {
ForkJoinPool p = new ForkJoinPool(4);
try {
ReentrantLock lock = new ReentrantLock();
ManagedLocker locker = new ManagedLocker(lock);
ForkJoinTask f = new LockingFibTask(20, locker, lock);
p.execute(f);
assertEquals(6765, (int) f.get());
} finally {
p.shutdownNow(); // don't wait out shutdown
}
}
/**
* pollSubmission returns unexecuted submitted task, if present
*/
public void testPollSubmission() {
final CountDownLatch done = new CountDownLatch(1);
SubFJP p = new SubFJP();
try {
ForkJoinTask a = p.submit(awaiter(done));
ForkJoinTask b = p.submit(awaiter(done));
ForkJoinTask c = p.submit(awaiter(done));
ForkJoinTask r = p.pollSubmission();
assertTrue(r == a || r == b || r == c);
assertFalse(r.isDone());
} finally {
done.countDown();
joinPool(p);
}
}
/**
* drainTasksTo transfers unexecuted submitted tasks, if present
*/
public void testDrainTasksTo() {
final CountDownLatch done = new CountDownLatch(1);
SubFJP p = new SubFJP();
try {
ForkJoinTask a = p.submit(awaiter(done));
ForkJoinTask b = p.submit(awaiter(done));
ForkJoinTask c = p.submit(awaiter(done));
ArrayList al = new ArrayList();
p.drainTasksTo(al);
assertTrue(al.size() > 0);
for (ForkJoinTask r : al) {
assertTrue(r == a || r == b || r == c);
assertFalse(r.isDone());
}
} finally {
done.countDown();
joinPool(p);
}
}
// FJ Versions of AbstractExecutorService tests
/**
* execute(runnable) runs it to completion
*/
public void testExecuteRunnable() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
TrackedRunnable task = trackedRunnable(SHORT_DELAY_MS);
assertFalse(task.isDone());
Future future = e.submit(task);
assertNull(future.get());
assertNull(future.get(MEDIUM_DELAY_MS, MILLISECONDS));
assertTrue(task.isDone());
assertTrue(future.isDone());
assertFalse(future.isCancelled());
} finally {
joinPool(e);
}
}
/**
* Completed submit(callable) returns result
*/
public void testSubmitCallable() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
Future future = e.submit(new StringTask());
assertSame(TEST_STRING, future.get());
assertTrue(future.isDone());
assertFalse(future.isCancelled());
} finally {
joinPool(e);
}
}
/**
* Completed submit(runnable) returns successfully
*/
public void testSubmitRunnable() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
Future future = e.submit(new NoOpRunnable());
assertNull(future.get());
assertTrue(future.isDone());
assertFalse(future.isCancelled());
} finally {
joinPool(e);
}
}
/**
* Completed submit(runnable, result) returns result
*/
public void testSubmitRunnable2() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
Future future = e.submit(new NoOpRunnable(), TEST_STRING);
assertSame(TEST_STRING, future.get());
assertTrue(future.isDone());
assertFalse(future.isCancelled());
} finally {
joinPool(e);
}
}
/**
* A submitted privileged action runs to completion
*/
public void testSubmitPrivilegedAction() throws Exception {
Runnable r = new CheckedRunnable() {
public void realRun() throws Exception {
ExecutorService e = new ForkJoinPool(1);
Future future = e.submit(Executors.callable(new PrivilegedAction() {
public Object run() {
return TEST_STRING;
}}));
assertSame(TEST_STRING, future.get());
}};
runWithPermissions(r,
new RuntimePermission("modifyThread"));
}
/**
* A submitted privileged exception action runs to completion
*/
public void testSubmitPrivilegedExceptionAction() throws Exception {
Runnable r = new CheckedRunnable() {
public void realRun() throws Exception {
ExecutorService e = new ForkJoinPool(1);
Future future = e.submit(Executors.callable(new PrivilegedExceptionAction() {
public Object run() {
return TEST_STRING;
}}));
assertSame(TEST_STRING, future.get());
}};
runWithPermissions(r, new RuntimePermission("modifyThread"));
}
/**
* A submitted failed privileged exception action reports exception
*/
public void testSubmitFailedPrivilegedExceptionAction() throws Exception {
Runnable r = new CheckedRunnable() {
public void realRun() throws Exception {
ExecutorService e = new ForkJoinPool(1);
Future future = e.submit(Executors.callable(new PrivilegedExceptionAction() {
public Object run() throws Exception {
throw new IndexOutOfBoundsException();
}}));
try {
future.get();
shouldThrow();
} catch (ExecutionException success) {
assertTrue(success.getCause() instanceof IndexOutOfBoundsException);
}}};
runWithPermissions(r, new RuntimePermission("modifyThread"));
}
/**
* execute(null runnable) throws NullPointerException
*/
public void testExecuteNullRunnable() {
ExecutorService e = new ForkJoinPool(1);
try {
Future future = e.submit((Runnable) null);
shouldThrow();
} catch (NullPointerException success) {
} finally {
joinPool(e);
}
}
/**
* submit(null callable) throws NullPointerException
*/
public void testSubmitNullCallable() {
ExecutorService e = new ForkJoinPool(1);
try {
Future future = e.submit((Callable) null);
shouldThrow();
} catch (NullPointerException success) {
} finally {
joinPool(e);
}
}
/**
* submit(callable).get() throws InterruptedException if interrupted
*/
public void testInterruptedSubmit() throws InterruptedException {
final CountDownLatch submitted = new CountDownLatch(1);
final CountDownLatch quittingTime = new CountDownLatch(1);
final ExecutorService p = new ForkJoinPool(1);
final Callable awaiter = new CheckedCallable() {
public Void realCall() throws InterruptedException {
assertTrue(quittingTime.await(MEDIUM_DELAY_MS, MILLISECONDS));
return null;
}};
try {
Thread t = new Thread(new CheckedInterruptedRunnable() {
public void realRun() throws Exception {
Future future = p.submit(awaiter);
submitted.countDown();
future.get();
}});
t.start();
assertTrue(submitted.await(MEDIUM_DELAY_MS, MILLISECONDS));
t.interrupt();
t.join();
} finally {
quittingTime.countDown();
joinPool(p);
}
}
/**
* get of submit(callable) throws ExecutionException if callable
* throws exception
*/
public void testSubmitEE() throws Throwable {
ForkJoinPool p = new ForkJoinPool(1);
try {
p.submit(new Callable() {
public Object call() {
int i = 5/0;
return Boolean.TRUE;
}}).get();
shouldThrow();
} catch (ExecutionException success) {
assertTrue(success.getCause() instanceof ArithmeticException);
} finally {
joinPool(p);
}
}
/**
* invokeAny(null) throws NullPointerException
*/
public void testInvokeAny1() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
e.invokeAny(null);
shouldThrow();
} catch (NullPointerException success) {
} finally {
joinPool(e);
}
}
/**
* invokeAny(empty collection) throws IllegalArgumentException
*/
public void testInvokeAny2() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
e.invokeAny(new ArrayList>());
shouldThrow();
} catch (IllegalArgumentException success) {
} finally {
joinPool(e);
}
}
/**
* invokeAny(c) throws NullPointerException if c has a single null element
*/
public void testInvokeAny3() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
List> l = new ArrayList>();
l.add(null);
try {
e.invokeAny(l);
shouldThrow();
} catch (NullPointerException success) {
} finally {
joinPool(e);
}
}
/**
* invokeAny(c) throws NullPointerException if c has null elements
*/
public void testInvokeAny4() throws Throwable {
CountDownLatch latch = new CountDownLatch(1);
ExecutorService e = new ForkJoinPool(1);
List> l = new ArrayList>();
l.add(latchAwaitingStringTask(latch));
l.add(null);
try {
e.invokeAny(l);
shouldThrow();
} catch (NullPointerException success) {
} finally {
latch.countDown();
joinPool(e);
}
}
/**
* invokeAny(c) throws ExecutionException if no task in c completes
*/
public void testInvokeAny5() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
List> l = new ArrayList>();
l.add(new NPETask());
try {
e.invokeAny(l);
shouldThrow();
} catch (ExecutionException success) {
assertTrue(success.getCause() instanceof NullPointerException);
} finally {
joinPool(e);
}
}
/**
* invokeAny(c) returns result of some task in c if at least one completes
*/
public void testInvokeAny6() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
List> l = new ArrayList>();
l.add(new StringTask());
l.add(new StringTask());
String result = e.invokeAny(l);
assertSame(TEST_STRING, result);
} finally {
joinPool(e);
}
}
/**
* invokeAll(null) throws NullPointerException
*/
public void testInvokeAll1() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
e.invokeAll(null);
shouldThrow();
} catch (NullPointerException success) {
} finally {
joinPool(e);
}
}
/**
* invokeAll(empty collection) returns empty collection
*/
public void testInvokeAll2() throws InterruptedException {
ExecutorService e = new ForkJoinPool(1);
try {
List> r
= e.invokeAll(new ArrayList>());
assertTrue(r.isEmpty());
} finally {
joinPool(e);
}
}
/**
* invokeAll(c) throws NullPointerException if c has null elements
*/
public void testInvokeAll3() throws InterruptedException {
ExecutorService e = new ForkJoinPool(1);
List> l = new ArrayList>();
l.add(new StringTask());
l.add(null);
try {
e.invokeAll(l);
shouldThrow();
} catch (NullPointerException success) {
} finally {
joinPool(e);
}
}
/**
* get of returned element of invokeAll(c) throws
* ExecutionException on failed task
*/
public void testInvokeAll4() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
List> l = new ArrayList>();
l.add(new NPETask());
List> futures = e.invokeAll(l);
assertEquals(1, futures.size());
try {
futures.get(0).get();
shouldThrow();
} catch (ExecutionException success) {
assertTrue(success.getCause() instanceof NullPointerException);
} finally {
joinPool(e);
}
}
/**
* invokeAll(c) returns results of all completed tasks in c
*/
public void testInvokeAll5() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
List> l = new ArrayList>();
l.add(new StringTask());
l.add(new StringTask());
List> futures = e.invokeAll(l);
assertEquals(2, futures.size());
for (Future future : futures)
assertSame(TEST_STRING, future.get());
} finally {
joinPool(e);
}
}
/**
* timed invokeAny(null) throws NullPointerException
*/
public void testTimedInvokeAny1() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
e.invokeAny(null, MEDIUM_DELAY_MS, MILLISECONDS);
shouldThrow();
} catch (NullPointerException success) {
} finally {
joinPool(e);
}
}
/**
* timed invokeAny(null time unit) throws NullPointerException
*/
public void testTimedInvokeAnyNullTimeUnit() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
List> l = new ArrayList>();
l.add(new StringTask());
try {
e.invokeAny(l, MEDIUM_DELAY_MS, null);
shouldThrow();
} catch (NullPointerException success) {
} finally {
joinPool(e);
}
}
/**
* timed invokeAny(empty collection) throws IllegalArgumentException
*/
public void testTimedInvokeAny2() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
e.invokeAny(new ArrayList>(),
MEDIUM_DELAY_MS, MILLISECONDS);
shouldThrow();
} catch (IllegalArgumentException success) {
} finally {
joinPool(e);
}
}
/**
* timed invokeAny(c) throws NullPointerException if c has null elements
*/
public void testTimedInvokeAny3() throws Throwable {
CountDownLatch latch = new CountDownLatch(1);
ExecutorService e = new ForkJoinPool(1);
List> l = new ArrayList>();
l.add(latchAwaitingStringTask(latch));
l.add(null);
try {
e.invokeAny(l, MEDIUM_DELAY_MS, MILLISECONDS);
shouldThrow();
} catch (NullPointerException success) {
} finally {
latch.countDown();
joinPool(e);
}
}
/**
* timed invokeAny(c) throws ExecutionException if no task completes
*/
public void testTimedInvokeAny4() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
List> l = new ArrayList>();
l.add(new NPETask());
try {
e.invokeAny(l, MEDIUM_DELAY_MS, MILLISECONDS);
shouldThrow();
} catch (ExecutionException success) {
assertTrue(success.getCause() instanceof NullPointerException);
} finally {
joinPool(e);
}
}
/**
* timed invokeAny(c) returns result of some task in c
*/
public void testTimedInvokeAny5() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
List> l = new ArrayList>();
l.add(new StringTask());
l.add(new StringTask());
String result = e.invokeAny(l, MEDIUM_DELAY_MS, MILLISECONDS);
assertSame(TEST_STRING, result);
} finally {
joinPool(e);
}
}
/**
* timed invokeAll(null) throws NullPointerException
*/
public void testTimedInvokeAll1() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
e.invokeAll(null, MEDIUM_DELAY_MS, MILLISECONDS);
shouldThrow();
} catch (NullPointerException success) {
} finally {
joinPool(e);
}
}
/**
* timed invokeAll(null time unit) throws NullPointerException
*/
public void testTimedInvokeAllNullTimeUnit() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
List> l = new ArrayList>();
l.add(new StringTask());
try {
e.invokeAll(l, MEDIUM_DELAY_MS, null);
shouldThrow();
} catch (NullPointerException success) {
} finally {
joinPool(e);
}
}
/**
* timed invokeAll(empty collection) returns empty collection
*/
public void testTimedInvokeAll2() throws InterruptedException {
ExecutorService e = new ForkJoinPool(1);
try {
List> r
= e.invokeAll(new ArrayList>(),
MEDIUM_DELAY_MS, MILLISECONDS);
assertTrue(r.isEmpty());
} finally {
joinPool(e);
}
}
/**
* timed invokeAll(c) throws NullPointerException if c has null elements
*/
public void testTimedInvokeAll3() throws InterruptedException {
ExecutorService e = new ForkJoinPool(1);
List> l = new ArrayList>();
l.add(new StringTask());
l.add(null);
try {
e.invokeAll(l, MEDIUM_DELAY_MS, MILLISECONDS);
shouldThrow();
} catch (NullPointerException success) {
} finally {
joinPool(e);
}
}
/**
* get of returned element of invokeAll(c) throws exception on failed task
*/
public void testTimedInvokeAll4() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
List> l = new ArrayList>();
l.add(new NPETask());
List> futures
= e.invokeAll(l, MEDIUM_DELAY_MS, MILLISECONDS);
assertEquals(1, futures.size());
try {
futures.get(0).get();
shouldThrow();
} catch (ExecutionException success) {
assertTrue(success.getCause() instanceof NullPointerException);
} finally {
joinPool(e);
}
}
/**
* timed invokeAll(c) returns results of all completed tasks in c
*/
public void testTimedInvokeAll5() throws Throwable {
ExecutorService e = new ForkJoinPool(1);
try {
List> l = new ArrayList>();
l.add(new StringTask());
l.add(new StringTask());
List> futures
= e.invokeAll(l, MEDIUM_DELAY_MS, MILLISECONDS);
assertEquals(2, futures.size());
for (Future future : futures)
assertSame(TEST_STRING, future.get());
} finally {
joinPool(e);
}
}
}
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