/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 com.twitter.distributedlog.util;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.twitter.util.Await;
import com.twitter.util.Duration;
import com.twitter.util.Function0;
import com.twitter.util.FuturePool;
import com.twitter.util.ExecutorServiceFuturePool;
import com.twitter.util.FutureEventListener;
import com.twitter.util.Future;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.ArrayList;
import java.util.List;
import static com.google.common.base.Charsets.UTF_8;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.fail;
import scala.runtime.BoxedUnit;
public class TestSafeQueueingFuturePool {
static final Logger LOG = LoggerFactory.getLogger(TestSafeQueueingFuturePool.class);
@Rule
public TestName runtime = new TestName();
class TestFuturePool<T> {
final ScheduledExecutorService executor;
final FuturePool pool;
final SafeQueueingFuturePool<T> wrapper;
TestFuturePool() {
executor = Executors.newScheduledThreadPool(1);
pool = new ExecutorServiceFuturePool(executor);
wrapper = new SafeQueueingFuturePool<T>(pool);
}
public void shutdown() {
executor.shutdown();
}
}
@Test
public void testSimpleSuccess() throws Exception {
TestFuturePool<Void> pool = new TestFuturePool<Void>();
final AtomicBoolean result = new AtomicBoolean(false);
Future<Void> future = pool.wrapper.apply(new Function0<Void>() {
public Void apply() {
result.set(true);
return null;
}
});
Await.result(future);
assertTrue(result.get());
pool.shutdown();
}
@Test
public void testSimpleFailure() throws Exception {
TestFuturePool<Void> pool = new TestFuturePool<Void>();
Future<Void> future = pool.wrapper.apply(new Function0<Void>() {
public Void apply() {
throw new RuntimeException("failed");
}
});
try {
Await.result(future);
fail("should have thrown");
} catch (Exception ex) {
}
pool.shutdown();
}
@Test
public void testFailedDueToClosed() throws Exception {
TestFuturePool<Void> pool = new TestFuturePool<Void>();
pool.wrapper.close();
Future<Void> future = pool.wrapper.apply(new Function0<Void>() {
public Void apply() {
throw new RuntimeException("failed");
}
});
try {
Await.result(future);
fail("should have thrown");
} catch (RejectedExecutionException ex) {
}
pool.shutdown();
}
@Test
public void testRejectedFailure() throws Exception {
TestFuturePool<Void> pool = new TestFuturePool<Void>();
final AtomicBoolean result = new AtomicBoolean(false);
pool.executor.shutdown();
final CountDownLatch latch = new CountDownLatch(1);
Future<Void> future = pool.wrapper.apply(new Function0<Void>() {
public Void apply() {
result.set(true);
latch.countDown();
return null;
}
});
try {
Await.result(future);
fail("should have thrown");
} catch (RejectedExecutionException ex) {
}
assertFalse(result.get());
pool.wrapper.close();
latch.await();
assertTrue(result.get());
pool.shutdown();
}
@Test
public void testRejectedBackupFailure() throws Exception {
TestFuturePool<Void> pool = new TestFuturePool<Void>();
final AtomicBoolean result = new AtomicBoolean(false);
pool.executor.shutdownNow();
final CountDownLatch latch1 = new CountDownLatch(1);
final CountDownLatch latch2 = new CountDownLatch(1);
Future<Void> future1 = pool.wrapper.apply(new Function0<Void>() {
public Void apply() {
try {
latch1.await();
} catch (Exception ex) {
}
return null;
}
});
// Enqueue a set of futures behind.
final int blockedCount = 100;
final ArrayList<Future<Void>> blockedFutures = new ArrayList<Future<Void>>(blockedCount);
final int[] doneArray = new int[blockedCount];
final AtomicInteger doneCount = new AtomicInteger(0);
for (int i = 0; i < blockedCount; i++) {
final int index = i;
blockedFutures.add(pool.wrapper.apply(new Function0<Void>() {
public Void apply() {
doneArray[index] = doneCount.getAndIncrement();
return null;
}
}));
}
// All the futures fail when the executor is force closed.
latch1.countDown();
pool.executor.shutdownNow();
for (int i = 0; i < blockedCount; i++) {
try {
Await.result(blockedFutures.get(i));
fail("should have thrown");
} catch (RejectedExecutionException ex) {
}
}
// None of them have completed.
for (int i = 0; i < blockedCount; i++) {
assertEquals(0, doneArray[i]);
}
// Close cleans up all pending ops in order.
pool.wrapper.close();
for (int i = 0; i < blockedCount; i++) {
assertEquals(i, doneArray[i]);
}
pool.shutdown();
}
}