What is fanout exchange in RabbitMQ?

A fanout exchange routes messages to all of the queues that are bound to it and the routing key is ignored. If N queues are bound to a fanout exchange, when a new message is published to that exchange a copy of the message is delivered to all N queues. Fanout exchanges are ideal for the broadcast routing of messages.

What is the difference between exchange and queue in RabbitMQ?

Exchanges. Messages are not published directly to a queue; instead, the producer sends messages to an exchange. An exchange is responsible for routing the messages to different queues with the help of bindings and routing keys. A binding is a link between a queue and an exchange.

What are the different types of exchanges in RabbitMQ?

RabbitMQ provides four types of exchanges: Direct, Fanout, Topic, and Headers.

Direct Exchanges. The Direct exchange type routes messages with a routing key equal to the routing key declared by the binding queue.
Fanout Exchanges.
Topic Exchanges.
Headers Exchanges.

What is an AMQP exchange?

What are AMQP exchanges? An exchange accepts messages from a producer application and routes them to message queues. They can be thought of as the “mailboxes” of the AMQP world. Unlike some other messaging middleware products and protocols, in AMQP, messages are not published directly to queues.

How many exchanges are in RabbitMQ?

In RabbitMQ, there are four different types of exchanges that route the message differently using different parameters and bindings setups.

How does a fanout exchange work in RabbitMQ?

With a fanout exchange, there is no such filtering and all messages go to all bound queues. So if you have a direct exchange with several queues bound with the same routing key, and all messages have this key, then you have the same behavior as the fanout exchange. This is better explained in tutorial 4 on the RabbitMQ website.

How are topic exchanges used in RabbitMQ routing?

Topic exchanges route messages to one or many queues based on matching between a message routing key and the pattern that was used to bind a queue to an exchange. The topic exchange type is often used to implement various publish/subscribe pattern variations. Topic exchanges are commonly used for the multicast routing of messages.

How is a fanout exchange represented in AMQP?

A fanout exchange can be represented graphically as follows: Topic exchanges route messages to one or many queues based on matching between a message routing key and the pattern that was used to bind a queue to an exchange. The topic exchange type is often used to implement various publish/subscribe pattern variations.

Can You fan out to multiple listeners in RabbitMQ?

Fanout is 1:N though, i.e. each task can be delivered to multiple listeners like pub-sub. Note that this isn’t restricted to a fanout exchange, but also applies if you bind multiple queues to a direct or topic exchange with the same binding key.

What is fanout exchange in RabbitMQ? A fanout exchange routes messages to all of the queues that are bound to it and the routing key is ignored. If N queues are bound to a fanout exchange, when a new message is published to that exchange a copy of the message is delivered to all N…