十五、curator recipes之DistributedQueue
简介
curator实现了先入先出的分布式消息队列,它采用的是zookeeper的持久化有序节点。
官方文档:http://curator.apache.org/curator-recipes/distributed-queue.html
javaDoc:http://curator.apache.org/apidocs/org/apache/curator/framework/recipes/queue/DistributedIdQueue.html
代码示例
import org.apache.curator.framework.CuratorFramework; import org.apache.curator.framework.CuratorFrameworkFactory; import org.apache.curator.framework.recipes.queue.DistributedQueue; import org.apache.curator.framework.recipes.queue.QueueBuilder; import org.apache.curator.framework.recipes.queue.QueueConsumer; import org.apache.curator.framework.recipes.queue.QueueSerializer; import org.apache.curator.framework.state.ConnectionState; import org.apache.curator.retry.ExponentialBackoffRetry; import java.io.UnsupportedEncodingException; public class DistributedQueueDemo { private static CuratorFramework client = CuratorFrameworkFactory.newClient("localhost:2181", new ExponentialBackoffRetry(3000, 2)); private static String path = "/queue/0001"; private static DistributedQueue<String> queue; static { client.start(); } public static void main(String[] args) throws Exception { QueueConsumer<String> consumer = new QueueConsumer<String>() { @Override public void stateChanged(CuratorFramework curatorFramework, ConnectionState connectionState) { System.out.println("state changed"); } @Override public void consumeMessage(String s) { System.out.println("消费数据:" + s); } }; queue = QueueBuilder.builder(client, consumer, new QueueSerializer<String>() { @Override public byte[] serialize(String s) { try { return s.getBytes("utf-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return null; } @Override public String deserialize(byte[] bytes) { return new String(bytes); } }, path).buildQueue(); queue.start(); System.out.println("queue built"); queue.put("a"); queue.put("b"); System.out.println("put ended"); Thread.sleep(100); queue.close(); Thread.sleep(50000); client.close(); } }