/**
* 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.leader;
import org.apache.curator.test.BaseClassForTests;
import org.apache.curator.utils.CloseableUtils;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.state.ConnectionState;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.curator.test.Timing;
import org.apache.curator.utils.ThreadUtils;
import org.testng.Assert;
import org.testng.annotations.Test;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
public class TestLeaderSelectorWithExecutor extends BaseClassForTests
{
private static final ThreadFactory threadFactory = ThreadUtils.newThreadFactory("FeedGenerator");
@Test
public void test() throws Exception
{
Timing timing = new Timing();
LeaderSelector leaderSelector = null;
CuratorFramework client = CuratorFrameworkFactory.builder()
.retryPolicy(new ExponentialBackoffRetry(100, 3))
.connectString(server.getConnectString())
.sessionTimeoutMs(timing.session())
.connectionTimeoutMs(timing.connection())
.build();
try
{
client.start();
MyLeaderSelectorListener listener = new MyLeaderSelectorListener();
ExecutorService executorPool = Executors.newFixedThreadPool(20);
leaderSelector = new LeaderSelector(client, "/test", threadFactory, executorPool, listener);
leaderSelector.autoRequeue();
leaderSelector.start();
timing.sleepABit();
Assert.assertEquals(listener.getLeaderCount(), 1);
}
finally
{
CloseableUtils.closeQuietly(leaderSelector);
CloseableUtils.closeQuietly(client);
}
}
private class MyLeaderSelectorListener implements LeaderSelectorListener
{
private volatile Thread ourThread;
private final AtomicInteger leaderCount = new AtomicInteger(0);
public int getLeaderCount()
{
return leaderCount.get();
}
@Override
public void takeLeadership(CuratorFramework curatorFramework) throws Exception
{
ourThread = Thread.currentThread();
try
{
leaderCount.incrementAndGet();
while ( !Thread.currentThread().isInterrupted() )
{
Thread.sleep(1000);
}
}
catch ( InterruptedException e )
{
Thread.currentThread().interrupt();
}
finally
{
leaderCount.decrementAndGet();
}
}
@Override
public void stateChanged(CuratorFramework curatorFramework, ConnectionState newState)
{
if ( (newState == ConnectionState.LOST) || (newState == ConnectionState.SUSPENDED) )
{
if ( ourThread != null )
{
ourThread.interrupt();
}
}
}
}
}