Question

我是暴风雨的新手我在我的喷口中使用rabbitmq从一些队列中接收元组并且有一个客户端运行一个其他机器将元组插入到该队列我运行了一个简单的rabbitmq示例程序，但工作正常但是当我我正在暴风雨中使用它，它被阻止在

connection = factory.newConnection();

即使我的rabbitmq服务器也在同一台机器上运行，当我运行示例代码时它运行成功。 print语句打印到语句

System.out.println(" setting host to 192.168.8.218..... ");

下面是我的完整鲸鱼喷水课程。

package storm.starter.spout;

import backtype.storm.spout.SpoutOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseRichSpout;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import backtype.storm.utils.Utils;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.QueueingConsumer;
import java.util.Map;
import java.util.Random;
import java.net.*;
import java.io.*;
import java.lang.Exception;
import java.io.IOException;

public class RabbitmqSpout extends BaseRichSpout {
    SpoutOutputCollector _collector;
    public final static String QUEUE_NAME = "record";
    ConnectionFactory factory;
    Connection connection;
    Channel channel;
    QueueingConsumer consumer;

    @Override
    public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) 
    {
        _collector = collector;
        System.out.println(" [*] Intilization of spout..... ");

        try
        {
            factory = new ConnectionFactory();
            System.out.println(" creating connection factory..... ");
            factory.setHost("192.168.8.96");
            System.out.println(" setting host to 192.168.8.218..... ");
            connection = factory.newConnection();
            System.out.println(" creating new connection..... ");
            channel = connection.createChannel();
            System.out.println(" creating new channel..... ");
            channel.queueDeclare(QUEUE_NAME, false, false, false, null);
            System.out.println(" Declaring queue..... ");
            System.out.println(" [*] Waiting for messages. ");
        }
        catch(Exception exception)
        {
            System.out.println("Exception occurred. "+exception.getMessage());
        }

    }

    @Override
    public void nextTuple() 
    {
        System.out.println("In wait of tuples.... ");
        try
        {
            consumer = new QueueingConsumer(channel);
            System.out.println(" trying to consume..... ");
            channel.basicConsume(QUEUE_NAME, true, consumer);

            while (true) 
            {
                System.out.println(" trying to deliver..... ");
                QueueingConsumer.Delivery delivery = consumer.nextDelivery();
                String message = new String(delivery.getBody());
                System.out.println(" getting string..... ");
                System.out.println(" [x] Received '" + message + "'");
                System.out.print("emitting Rabbitmq Queue tuple");
                _collector.emit(new Values(message));
                System.out.print("emitted Rabbitmq Queue tuple");
            }   
        }

        catch(IOException io)
        {
            System.out.println("Exception occurred. ");
        }
        catch(Exception exception)
        {
            System.out.println("Exception occurred. ");
        }


    }        

    @Override
    public void ack(Object id) {
    }

    @Override
    public void fail(Object id) 
    {

    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) 
    {
        declarer.declare(new Fields("record"));
    }

}

Answer 1

connection = factory.newConnection()

在RabbitMQConsumer类的RabbitMQConsumer()方法中完成，因为RabbitMQ使用者将数据从队列中取出，然后将数据提供给RabbitMQ spout。请参考： [https://github.com/ppat/storm-rabbitmq/tree/master/src/main/java/io/latent/storm/rabbitmq][1]

Rabbitmq在风暴拓扑中创建新连接时阻塞

1 个答案: