/**
* 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 leader;
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.retry.ExponentialBackoffRetry;
import org.apache.curator.test.TestingServer;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.List;
public class LeaderSelectorExample
{
private static final int CLIENT_QTY = 10;
private static final String PATH = "/examples/leader";
public static void main(String[] args) throws Exception
{
// all of the useful sample code is in ExampleClient.java
System.out.println("Create " + CLIENT_QTY + " clients, have each negotiate for leadership and then wait a random number of seconds before letting another leader election occur.");
System.out.println("Notice that leader election is fair: all clients will become leader and will do so the same number of times.");
List<CuratorFramework> clients = Lists.newArrayList();
List<ExampleClient> examples = Lists.newArrayList();
TestingServer server = new TestingServer();
try
{
for ( int i = 0; i < CLIENT_QTY; ++i )
{
CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new ExponentialBackoffRetry(1000, 3));
clients.add(client);
ExampleClient example = new ExampleClient(client, PATH, "Client #" + i);
examples.add(example);
client.start();
example.start();
}
System.out.println("Press enter/return to quit\n");
new BufferedReader(new InputStreamReader(System.in)).readLine();
}
finally
{
System.out.println("Shutting down...");
for ( ExampleClient exampleClient : examples )
{
Closeables.closeQuietly(exampleClient);
}
for ( CuratorFramework client : clients )
{
Closeables.closeQuietly(client);
}
Closeables.closeQuietly(server);
}
}
}