/**
* 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 locking;
import com.google.common.io.Closeables;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.curator.test.TestingServer;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
public class LockingExample
{
private static final int QTY = 5;
private static final int REPETITIONS = QTY * 10;
private static final String PATH = "/examples/locks";
public static void main(String[] args) throws Exception
{
// all of the useful sample code is in ExampleClientThatLocks.java
// FakeLimitedResource simulates some external resource that can only be access by one process at a time
final FakeLimitedResource resource = new FakeLimitedResource();
ExecutorService service = Executors.newFixedThreadPool(QTY);
final TestingServer server = new TestingServer();
try
{
for ( int i = 0; i < QTY; ++i )
{
final int index = i;
Callable<Void> task = new Callable<Void>()
{
@Override
public Void call() throws Exception
{
CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new ExponentialBackoffRetry(1000, 3));
try
{
client.start();
ExampleClientThatLocks example = new ExampleClientThatLocks(client, PATH, resource, "Client " + index);
for ( int j = 0; j < REPETITIONS; ++j )
{
example.doWork(10, TimeUnit.SECONDS);
}
}
catch ( Throwable e )
{
e.printStackTrace();
}
finally
{
Closeables.closeQuietly(client);
}
return null;
}
};
service.submit(task);
}
service.shutdown();
service.awaitTermination(10, TimeUnit.MINUTES);
}
finally
{
Closeables.closeQuietly(server);
}
}
}