Publishers and subscribers

• Publishers are API clients that send (publish) messages to topics.
• Subscribers are API clients that subscribe to topics of interest and read (receive) from their message queues messages that were previously sent by publishers.
• Collectively, publishers and subscribers are known as endpoints.
• It is possible for one endpoint to be both a publisher and subscriber.
• Endpoints publish, subscribe to, and read their messages independently, without interfering with each other's work.
• Subscribers can be automatically notified of new messages available or they can pull their messages periodically.
• Endpoints can be of several types: Python, REST, WebSockets and File transfer.
• Applications in other technologies, such as JavaScript or Java, typically become endpoints through the usage of REST or APIs based on Python services.
• REST and WebSockets endpoints have Basic Auth credentials that they log in to Zato with.
• Each endpoint has pattern-based permissions that let it publish or receive messages from topics and queues.
• Messages that REST and WebSocket endpoints always use JSON. Python and File transfer can use any data format.
• Messages that are published or received can be enriched or transformed in arbitrary ways, e.g. from one data format to another.
• Because REST and WebSocket endpoints use standard Basic Auth and JSON, rather than a custom protocol, applications of any kind can conveniently become endpoints in the publish/subscribe architecture without a need for additional custom protocol-specific libraries or packages.

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