amqp

A colleague and I are working on an application using Spring which needs to get a message from a RabbitMQ queue. The idea is to do this using (the usually excellent) spring annotation system to make the code easy to understand. We have the system working using the @RabbitListner annotation but we want to get a message on demand. The @RabbitListner annotation does not do this, it just receives messages when they are available. The demand is determined by the "readiness" of the client i.e. a client should "get" a message from te queue stop listing and process the message. Then determine if it is

一、RabbitMQ基本概念 rabbitMQ是什么 AMQP简介 说到rabbitMQ，就不得不提下 AMQP（advanced Message Queuing Protocol）高级消息队列协议 。 AMQP是一个提供统一消息服务的应用层标准高级消息队列协议,是应用层协议的一个开放标准,为面向消息的中间件而设计的。基于此协议的客户端与消息中间件可传递消息，并不受客户端/中间件不同产品，不同的开发语言等条件的限制。消息中间件主要用于组件之间的解耦，消息的发送者无需知道消息使用者的存在，反之亦然。 上图即AMQP消息队列的模型。 Publisher即消息的生产者，消息生产者负责生产消息并发布到消息队列中。 Consumer即消息的消费者，消费者负责从消息队列中取出消息，并对消息做相应的处理。 中间大矩形中的所有可以理解成一个消息队列服务器。 rabbitMQ和AMQP的关系。 AMQP是一个协议标准，一个规范，rabbitMQ是具体的实现。 ##为什么要使用消息队列。 刚接触消息队列的人可能会有一些误解。 以为消息队列是用来提高系统性能，加速消息转发。其实不然，如果加速消息转发，直接自己在内存中写一个queue，把消息的生产者和消费者合在一起，没了持久化、网络传，消息转发岂不是更快。 以为消息队列，就是一个数据源，作为下一级输入的数据源，存放中间结果用的。这当然没错

问题： 2016-07-18 22:36:09.387 2817 ERROR oslo.messaging._drivers.impl_rabbit [req-51faf017-4f1f-4a24-ab79-624b302b839b - - - - -] AMQP server controller:5672 closed the connection. Check login credentials: Socket closed 2016-07-18 22:36:38.446 2817 ERROR oslo.messaging._drivers.impl_rabbit [req-51faf017-4f1f-4a24-ab79-624b302b839b - - - - -] AMQP server controller:5672 closed the connection. Check login credentials: Socket closed 2016-07-18 22:37:09.524 2817 ERROR oslo.messaging._drivers.impl_rabbit [req-51faf017-4f1f-4a24-ab79-624b302b839b - - - - -] AMQP server controller:5672 closed the

I have a Listener class (that implements Spring's MessageListener interface) where I need to not requeue any messages if an exception occurs, but I want to post the message to a different queue. It seems like I need the Listener to catch an AmqpRejectAndDontRequeueException , but I've read that I need it to throw the exception instead. If I do that, I can't re-post the message. Should I just catch a plain Exception and do the re-post there? Is there any need to actually throw the AmqpRejectAndDontRequeueException at that point? I'm wondering about the best practice for this. Thanks. There are

I am currently researching how to connect to Azure Service Bus using Qpid JMS (qpid-jms-client-0.11.1.jar). I have created a Demo Java application SimpleSenderReceiver which connects to an already configured Azure Service Bus using the following guide ( #link1 ). This code seems to work using a "very" old version om the Qpid JMS client (version 0.32). I am now trying to get it to work with the latest stable version of Qpid JMS (qpid-jms-client-0.11.1.jar), And so far I have not been successful. Going through the documentation #link2 of Qpid JMS 0.11.1, you can see that the way that the in the

Is is possible to configure a RabbitMQ exchange or a queue in such a way that at most one message with a given routing key is pending at any time? If new message arrives, the old one would be dropped and the new one enqueued. If such option is not available, what would be the best way to implement this at the application level? I.e. when application receives a message how can it check if there any more pending messages? robthewolf You need to install Last Value Cache and enable it. Your exchange will be type "x-lvc", which inherits from the direct exchange type. each time you connect to MQ,

Is it possible to make multiple consumers to share one single queue in RabbitMQ? I am currently using this php library to work with RabbitMQ, from what I observe, although I have 2 identical instances of a consumer script running, but only one would respond to the message passed... If you want both consumers to see all messages, give each consumer its own (probably private) queue and bind them both to the same exchange. 来源： https://stackoverflow.com/questions/1831705/multiple-consumer-one-queue

简介 目前，主流的消息中间件主要有：ActiveMQ、Kafka、RabbitMQ、RocketMQ等等......，而我们今天的主角是：RabbitMQ，RabbitMQ是基于erlang语言开发具有高可用高并发的优点，适合集群服务器，它是基于AMDP协议来实现的，AMQP的和主要特征是面向消息、队列、路由（包括点对点和发布/订阅）、可靠性、安全，RabbitMQ支持多种语言，有消息确认机制和持久化机制，保证数据不丢失的前提做到可靠性、可用性。 消息与消息队列 消息（Message）是指应用于应用之间传送的数据，消息的类型包括文本字符串、JSON、XML、内嵌对象等等... 所谓 消息中间件 / 消息队列（ Message Queue Middleware，简称MQ）是利用高效可靠的消息传递机制进行数据交流，同时可以基于数据通信来进行分布式系统的继承，消息中间件一般有两种传递模式： 点对点（Point-to-Point）模式和发布/订阅（Pub/Sub）模式 ，点对点模式是基于队列的，消息生产者发送消息到队列，消息消费者从队列中接收消息，队列的存在使得消息的异步传输成为了可能，发布订阅模式定义了如何向一个内容节点发布和订阅内容，这个内容节点叫topic，这种模式可以满足消费者发布一个消息，多个消费者同时消费同一信息的需求。 性能对比 了解什么是AMQP协议？ 其中

I read in forum that while implementing any application using AMQP it is necessary to use fewer queues. So would I be completely wrong to assume that if I were cloning twitter I would have a unique and durable queue for each user signing up? It just seems the most natural approach and if not assign a unique queue for each user how would one design something like that. What is the most used approach for web messaging. I see RabbitHUb and Rabbit WebHooks but Webhooks doesn't seem to be a scalable solution. i am working with Rails and my AMQP server as running as a Daemon. In RabbitMQ, queues are