We publish one message to the resource. semaphore queue. ... So, RabbitMQ will keep track of the message and if the processes crashes or exists, the message will go back to the queue, and it will be delivered to the next process listening from our semaphore queue.

Does RabbitMQ use a database?

Every RabbitMQ node has a data directory that stores all the information that resides on that node. A data directory contains two types of data: definitions (metadata, schema/topology) and message store data.

How does RabbitMQ communicate?

RabbitMQ uses a protocol called AMQP by default. ... A client library has several methods; in this case, to communicate with RabbitMQ. The methods should be used when you connect to the RabbitMQ broker (using the given parameters, hostname, port number, etc.), for example, or when you declare a queue or an exchange.