Download RabbitMQ Cookbook by Gabriele Santomaggio, Sigismondo Boschi PDF

By Gabriele Santomaggio, Sigismondo Boschi

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RabbitMQ is an open resource message dealer software program (sometimes referred to as message-oriented middleware) that implements the complex Message Queuing Protocol (AMQP). The RabbitMQ server is written within the Erlang programming language and is equipped at the Open Telecom Platform framework for clustering and failover. Messaging permits software program functions to attach and scale. purposes can connect with one another as parts of a bigger software or to consumer units and knowledge.

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Sample text

ExchangeDeclare(exchangeName, "topic", false, false, null); 2. getBytes()); Then, the consumers: 1. Declare the same exchange, identical to what was done in step 1. 2. getQueue(); 3. queueBind(myQueue,exchangeName,bindingKey); 4. After having created a suitable consumer object, start consuming messages as already seen in the Consuming messages recipe. How it works… As in the previous recipe, messages sent to a topic exchange are tagged with a string (step 2), but it is important for a topic exchange to be composed more of dot-separated words; these are supposed to be the topics of the message.

How to do it… You can use transactional messages by performing the following steps: 1. queueDeclare(myQueue, true, false, false, null); 2. txSelect(); 3. txCommit(); How it works… After creating a persistent queue (step 1), we have set the channel in the transaction mode using the method txSelect() (step 2). Using txCommit() the message is stored in the queue and written to the disk; the message will then be delivered to the consumer(s). The method txSelect()must be called at least once before txCommit() or txRollback().

BasicGet(), it will continue to exist. Only when we stop both the operations for at least 30 seconds, the queue is dropped and all the messages that it contains are lost. The queue is dropped independently from the fact that there are producers publishing messages to it or not. In the course of the experiments, we can monitor the RabbitMQ queue status issuing rabbitmqctl list_queues and see this happening. So, we can imagine a scenario where we have a statistics analysis program that needs to be restarted for an update of the code itself.

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