Nirvana Publish / Subscribe

Overview

Nirvana provides publish subscribe functionality through the use of channel objects. Channels are the logical rendezvous point for publishers (producers) and subscribers (consumers) or data (events).

Channels can be equated with JMS Topics if you are using the Nirvana JMS implementation although Nirvana channels provide a much richer level of functionality than is available via the JMS API..

Publish / Subscribe using channels differs from message queues in the way that events are delivered to consumers. Under the publish / subscribe paradigm, each event is delivered to each subscriber once and only once per subscription, and is not removed from the channel after being consumed.

This section demonstrates how Nirvana pub / sub works, and provides example code snippets for all relevant concepts.

Creating a channel

Finding a channel

Nirvana events

Nirvana event dictionaries

Publishing events to a channel

Asynchronous channel consumer

Synchronous channel consumer

Durable Consumers and named objects

Channel Joins