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Previous: File Locks Next: Linearizable Counters

Distributed Locks

Using ZooKeeper v3.4.12 and Curator v4.0.1, we demonstrate below how to use ZooKeeper to rewrite the previous example:

import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.recipes.locks.*;
import org.apache.curator.retry.ExponentialBackoffRetry;
import java.lang.management.ManagementFactory;
public class Main {
public static void main(String args[]) throws Exception {
final RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
final CuratorFramework client = CuratorFrameworkFactory.newClient("127.0.0.1:2181", retryPolicy);
final InterProcessMutex lock = new InterProcessMutex(client, "/path/to/lock");
final String processID = ManagementFactory.getRuntimeMXBean().getName();
try {
client.start();
lock.acquire();
System.out.println(processID + " acquired the lock");
Thread.sleep(1000); // simulates other work being done
System.out.println(processID + " is releasing the lock");
} finally {
if (lock.isAcquiredInThisProcess()) {
lock.release();
}
client.close();
}
}
}
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