/**
* 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 org.apache.curator.framework.recipes.barriers;
import com.google.common.collect.Lists;
import com.google.common.io.Closeables;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.recipes.BaseClassForTests;
import org.apache.curator.retry.RetryOneTime;
import org.apache.curator.test.Timing;
import org.testng.Assert;
import org.testng.annotations.Test;
import java.io.Closeable;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
public class TestDistributedDoubleBarrier extends BaseClassForTests
{
private static final int QTY = 5;
@Test
public void testMultiClient() throws Exception
{
final Timing timing = new Timing();
final CountDownLatch postEnterLatch = new CountDownLatch(QTY);
final CountDownLatch postLeaveLatch = new CountDownLatch(QTY);
final AtomicInteger count = new AtomicInteger(0);
final AtomicInteger max = new AtomicInteger(0);
List<Future<Void>> futures = Lists.newArrayList();
ExecutorService service = Executors.newCachedThreadPool();
for ( int i = 0; i < QTY; ++i )
{
Future<Void> future = service.submit
(
new Callable<Void>()
{
@Override
public Void call() throws Exception
{
CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
try
{
client.start();
DistributedDoubleBarrier barrier = new DistributedDoubleBarrier(client, "/barrier", QTY);
Assert.assertTrue(barrier.enter(timing.seconds(), TimeUnit.SECONDS));
synchronized(TestDistributedDoubleBarrier.this)
{
int thisCount = count.incrementAndGet();
if ( thisCount > max.get() )
{
max.set(thisCount);
}
}
postEnterLatch.countDown();
Assert.assertTrue(timing.awaitLatch(postEnterLatch));
Assert.assertEquals(count.get(), QTY);
Assert.assertTrue(barrier.leave(timing.seconds(), TimeUnit.SECONDS));
count.decrementAndGet();
postLeaveLatch.countDown();
Assert.assertTrue(timing.awaitLatch(postEnterLatch));
}
finally
{
Closeables.closeQuietly(client);
}
return null;
}
}
);
futures.add(future);
}
for ( Future<Void> f : futures )
{
f.get();
}
Assert.assertEquals(count.get(), 0);
Assert.assertEquals(max.get(), QTY);
}
@Test
public void testOverSubscribed() throws Exception
{
final Timing timing = new Timing();
final CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
ExecutorService service = Executors.newCachedThreadPool();
ExecutorCompletionService<Void> completionService = new ExecutorCompletionService<Void>(service);
try
{
client.start();
final Semaphore semaphore = new Semaphore(0);
final CountDownLatch latch = new CountDownLatch(1);
for ( int i = 0; i < (QTY + 1); ++i )
{
completionService.submit
(
new Callable<Void>()
{
@Override
public Void call() throws Exception
{
DistributedDoubleBarrier barrier = new DistributedDoubleBarrier(client, "/barrier", QTY)
{
@Override
protected List<String> getChildrenForEntering() throws Exception
{
semaphore.release();
Assert.assertTrue(timing.awaitLatch(latch));
return super.getChildrenForEntering();
}
};
Assert.assertTrue(barrier.enter(timing.seconds(), TimeUnit.SECONDS));
Assert.assertTrue(barrier.leave(timing.seconds(), TimeUnit.SECONDS));
return null;
}
}
);
}
Assert.assertTrue(semaphore.tryAcquire(QTY + 1, timing.seconds(), TimeUnit.SECONDS)); // wait until all QTY+1 barriers are trying to enter
latch.countDown();
for ( int i = 0; i < (QTY + 1); ++i )
{
completionService.take().get(); // to check for assertions
}
}
finally
{
service.shutdown();
Closeables.closeQuietly(client);
}
}
@Test
public void testBasic() throws Exception
{
final Timing timing = new Timing();
final List<Closeable> closeables = Lists.newArrayList();
final CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
try
{
closeables.add(client);
client.start();
final CountDownLatch postEnterLatch = new CountDownLatch(QTY);
final CountDownLatch postLeaveLatch = new CountDownLatch(QTY);
final AtomicInteger count = new AtomicInteger(0);
final AtomicInteger max = new AtomicInteger(0);
List<Future<Void>> futures = Lists.newArrayList();
ExecutorService service = Executors.newCachedThreadPool();
for ( int i = 0; i < QTY; ++i )
{
Future<Void> future = service.submit
(
new Callable<Void>()
{
@Override
public Void call() throws Exception
{
DistributedDoubleBarrier barrier = new DistributedDoubleBarrier(client, "/barrier", QTY);
Assert.assertTrue(barrier.enter(timing.seconds(), TimeUnit.SECONDS));
synchronized(TestDistributedDoubleBarrier.this)
{
int thisCount = count.incrementAndGet();
if ( thisCount > max.get() )
{
max.set(thisCount);
}
}
postEnterLatch.countDown();
Assert.assertTrue(timing.awaitLatch(postEnterLatch));
Assert.assertEquals(count.get(), QTY);
Assert.assertTrue(barrier.leave(10, TimeUnit.SECONDS));
count.decrementAndGet();
postLeaveLatch.countDown();
Assert.assertTrue(timing.awaitLatch(postLeaveLatch));
return null;
}
}
);
futures.add(future);
}
for ( Future<Void> f : futures )
{
f.get();
}
Assert.assertEquals(count.get(), 0);
Assert.assertEquals(max.get(), QTY);
}
finally
{
for ( Closeable c : closeables )
{
Closeables.closeQuietly(c);
}
}
}
}