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/*
* Copyright 2015 Open Networking Laboratory
*
* 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.onlab.util;
import com.google.common.collect.Lists;
import org.junit.Test;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import static org.junit.Assert.*;
import static org.onlab.util.BoundedThreadPool.*;
import static org.onlab.util.Tools.namedThreads;
/**
* Test of BoundedThreadPool.
*/
public final class BoundedThreadPoolTest {
@Test
public void simpleJob() {
final Thread myThread = Thread.currentThread();
final AtomicBoolean sameThread = new AtomicBoolean(true);
final CountDownLatch latch = new CountDownLatch(1);
BoundedThreadPool exec = newSingleThreadExecutor(namedThreads("test"));
exec.submit(() -> {
sameThread.set(myThread.equals(Thread.currentThread()));
latch.countDown();
});
try {
assertTrue("Job not run", latch.await(100, TimeUnit.MILLISECONDS));
assertFalse("Runnable used caller thread", sameThread.get());
} catch (InterruptedException e) {
fail();
} finally {
exec.shutdown();
}
// TODO perhaps move to tearDown
try {
assertTrue(exec.awaitTermination(1, TimeUnit.SECONDS));
} catch (InterruptedException e) {
fail();
}
}
private List<CountDownLatch> fillExecutor(BoundedThreadPool exec) {
int numThreads = exec.getMaximumPoolSize();
List<CountDownLatch> latches = Lists.newArrayList();
final CountDownLatch started = new CountDownLatch(numThreads);
List<CountDownLatch> finished = Lists.newArrayList();
// seed the executor's threads
for (int i = 0; i < numThreads; i++) {
final CountDownLatch latch = new CountDownLatch(1);
final CountDownLatch fin = new CountDownLatch(1);
latches.add(latch);
finished.add(fin);
exec.submit(() -> {
try {
started.countDown();
latch.await();
fin.countDown();
} catch (InterruptedException e) {
fail();
}
});
}
try {
assertTrue(started.await(100, TimeUnit.MILLISECONDS));
} catch (InterruptedException e) {
fail();
}
// fill the queue
CountDownLatch startedBlocked = new CountDownLatch(1);
while (exec.getQueue().remainingCapacity() > 0) {
final CountDownLatch latch = new CountDownLatch(1);
latches.add(latch);
exec.submit(() -> {
try {
startedBlocked.countDown();
latch.await();
} catch (InterruptedException e) {
fail();
}
});
}
latches.remove(0).countDown(); // release one of the executors
// ... we need to do this because load is recomputed when jobs are taken
// Note: For this to work, 1 / numThreads must be less than the load threshold (0.2)
// verify that the old job has terminated
try {
assertTrue("Job didn't finish",
finished.remove(0).await(100, TimeUnit.MILLISECONDS));
} catch (InterruptedException e) {
fail();
}
// verify that a previously blocked thread has started
try {
assertTrue(startedBlocked.await(10, TimeUnit.MILLISECONDS));
} catch (InterruptedException e) {
fail();
}
// add another job to fill the queue
final CountDownLatch latch = new CountDownLatch(1);
latches.add(latch);
exec.submit(() -> {
try {
latch.await();
} catch (InterruptedException e) {
fail();
}
});
assertEquals(exec.getQueue().size(), maxQueueSize);
return latches;
}
@Test
public void releaseOneThread() {
maxQueueSize = 10;
BoundedThreadPool exec = newFixedThreadPool(4, namedThreads("test"));
List<CountDownLatch> latches = fillExecutor(exec);
CountDownLatch myLatch = new CountDownLatch(1);
ExecutorService myExec = Executors.newSingleThreadExecutor();
Future<Thread> expected = myExec.submit(Thread::currentThread);
assertEquals(exec.getQueue().size(), maxQueueSize);
long start = System.nanoTime();
Future<Thread> actual = myExec.submit(() -> {
return exec.submit(() -> {
myLatch.countDown();
return Thread.currentThread();
}).get();
});
try {
assertFalse("Thread should still be blocked",
myLatch.await(10, TimeUnit.MILLISECONDS));
latches.remove(0).countDown(); // release the first thread
assertFalse("Thread should still be blocked",
myLatch.await(10, TimeUnit.MILLISECONDS));
latches.remove(0).countDown(); // release the second thread
assertTrue("Thread should be unblocked",
myLatch.await(10, TimeUnit.MILLISECONDS));
long delta = System.nanoTime() - start;
double load = exec.getQueue().size() / (double) maxQueueSize;
assertTrue("Load is greater than threshold", load <= 0.8);
assertTrue("Load is less than threshold", load >= 0.6);
assertEquals("Work done on wrong thread", expected.get(), actual.get());
assertTrue("Took more than one second", delta < Math.pow(10, 9));
} catch (InterruptedException | ExecutionException e) {
fail();
} finally {
latches.forEach(CountDownLatch::countDown);
exec.shutdown();
}
// TODO perhaps move to tearDown
try {
assertTrue(exec.awaitTermination(1, TimeUnit.SECONDS));
} catch (InterruptedException e) {
fail();
}
}
@Test
public void highLoadTimeout() {
maxQueueSize = 10;
BoundedThreadPool exec = newFixedThreadPool(2, namedThreads("test"));
List<CountDownLatch> latches = fillExecutor(exec);
// true if the job is executed and it is done on the test thread
final AtomicBoolean sameThread = new AtomicBoolean(false);
final Thread myThread = Thread.currentThread();
long start = System.nanoTime();
exec.submit(() -> {
sameThread.set(myThread.equals(Thread.currentThread()));
});
long delta = System.nanoTime() - start;
assertEquals(maxQueueSize, exec.getQueue().size());
assertTrue("Work done on wrong thread (or didn't happen)", sameThread.get());
assertTrue("Took less than one second. Actual: " + delta / 1_000_000.0 + "ms",
delta > Math.pow(10, 9));
assertTrue("Took more than two seconds", delta < 2 * Math.pow(10, 9));
latches.forEach(CountDownLatch::countDown);
exec.shutdown();
// TODO perhaps move to tearDown
try {
assertTrue(exec.awaitTermination(1, TimeUnit.SECONDS));
} catch (InterruptedException e) {
fail();
}
}
}
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