Message Models

Most messaging applications can be reduced to a series of interactions that adhere to one of the following messaging models:

• Point-to-Point
• Publish-Subscribe
• Request-Reply

Point-to-Point

With Point-to-Point messaging, messages sent by the Producer are to be processed by a single Consumer.

Non-Exclusive Consumption

An extension of traditional Point-to-Point messaging is the addition of multiple consumers consuming from a shared channel or queue. The scale of the overall receiving application is increased by having multiple consumers, but each message is still only delivered to a single consumer.

Publish-Subscribe

With publish-subscribe messaging, messages sent by the Producer are processed multiple times by different consumers. Each consumer receives its own copy of the message for processing.

Request-Reply

With request-reply messaging, applications achieve two-way communication using separate point-to-point channels: one for requests, and another for replies.