zookeeper分布式集群Curator的分布式整型int计数器SharedCount

Curator的SharedCount通常用于维护一个分布式的整数计数器。以下是使用Curator的SharedCount的一个简单示例：

import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.recipes.shared.SharedCount;
import org.apache.curator.retry.ExponentialBackoffRetry;
 
public class DistributedCounterExample {
    private static final String ZOOKEEPER_ADDRESS = "localhost:2181";
    private static final String COUNTER_PATH = "/my_counter";
 
    public static void main(String[] args) throws Exception {
        CuratorFramework client = CuratorFrameworkFactory.newClient(ZOOKEEPER_ADDRESS, new ExponentialBackoffRetry(1000, 3));
        client.start();
 
        SharedCount sharedCount = new SharedCount(client, COUNTER_PATH, 0);
        sharedCount.start();
 
        // 增加计数器
        System.out.println("Current count: " + sharedCount.getCount());
        sharedCount.addListener((curatorFramework, event) -> {
            System.out.println("Count changed: " + sharedCount.getCount());
        });
        sharedCount.trySetCount(sharedCount.getCount() + 1);
 
        // 停止资源
        sharedCount.close();
        client.close();
    }
}

在这个例子中，我们首先创建了一个Curator客户端连接到ZooKeeper服务。然后，我们创建了一个SharedCount实例，指定了一个ZooKeeper上的路径和一个初始值。我们监听计数器的变化并尝试修改计数器的值。最后，我们在完成操作后关闭资源。这个例子展示了如何使用Curator的SharedCount来维护一个分布式的整数计数器。