zookeeper分布式集群Curator的分布式long型计数器DistributedAtomicLong
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.recipes.atomic.DistributedAtomicLong;
import org.apache.curator.retry.ExponentialBackoffRetry;
public class DistributedCounterExample {
private static final String ZOOKEEPER_ADDRESS = "localhost:2181";
private static final String COUNTER_PATH = "/distributed_counter";
public static void main(String[] args) throws Exception {
CuratorFramework client = CuratorFrameworkFactory.newClient(
ZOOKEEPER_ADDRESS, new ExponentialBackoffRetry(1000, 3));
client.start();
DistributedAtomicLong counter = new DistributedAtomicLong(
client, COUNTER_PATH, new ExponentialBackoffRetry(1000, 3));
// 获取当前计数器的值
System.out.println("Current counter value: " + counter.get().postValue());
// 递增计数器
System.out.println("Incremented counter value: " + counter.increment().postValue());
// 关闭客户端
client.close();
}
}
这段代码演示了如何使用Curator的DistributedAtomicLong
来创建和操作一个分布式计数器。首先,它创建了一个Curator客户端,并设置了重试策略。然后,它创建了一个DistributedAtomicLong
实例,并指定了共享计数器的ZooKeeper路径。接下来,它获取了计数器的当前值并打印出来,然后递增了计数器的值,并再次打印出新的值。最后,它关闭了Curator客户端。这个例子简单地展示了如何使用Curator框架中的原子长整型计数器,这对于分布式系统中需要全局一致的计数器场景非常有用。
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