RabbitMQ - Queues

• A queue is a sequential FIFO data structure in which items can be enqueued (to the back) and dequeued (from the front)

Queue Names

• Applications can assign their own queue names or ask the broker to generate a name.
• Queue names can be up to 255 bytes of UTF-8 characters
• Queue names starting with amq. are reserved for internal use

Queue Properties

• Name
• Durable (whether or not the queue will survive a broker restart)
• Exclusive (used by only one connection and the queue will be deleted when the connection closes)
• Auto-delete (queue will be deleted when the last consumer unsubscribes)
• Optional arguments - e.g. message TTL, queue length limit, etc.

Queue Creation

• Before a queue can be used, it has to be declared
• Declaring a queue will cause it to be created if it does not already exist
• Declaring a queue is idempotent. Creating a queue which already exists with the same attributes has no effect
• Declaring a queue which already exists with different attributes will return an error.