Publish-Subscribe

Publish-Subscribe

NATS implements a publish-subscribe message distribution model for one-to-many communication. A publisher sends a message on a subject and any active subscriber listening on that subject receives the message. Subscribers can also register interest in wildcard subjects that work a bit like a regular expression (but only a bit). This one-to-many pattern is sometimes called a fan-out.

Messages

Messages are composed of:
  1. 1.
    A subject.
  2. 2.
    A payload in the form of a byte array.
  3. 3.
    Any number of header fields.
  4. 4.
    An optional 'reply' address field.
Messages have a maximum size (which is set in the server configuration with max_payload). The size is set to 1 MB by default, but can be increased up to 64 MB if needed (though we recommend keeping the max message size to something more reasonable like 8 MB).
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Outline
Publish-Subscribe
Messages