Messaging models
As messaging technologies have evolved, two types of asynchronous messaging models have emerged:
- Point-to-Point
- Publish/Subscribe
These models describe how the messaging provider distributes messages to the target destination, that is, they describe the cardinalities for the sender-receiver relationship. It is possible for an application to make use of both messaging models.
Several patterns also exist that describe the way in which messaging applications connect to, and use, messaging providers. These patterns describe whether a messaging application interacts with the messaging provider as a message producer, message consumer, or both. When a messaging application acts as both message producer and message consumer, the messaging pattern is referred to as request-reply.