The Message Room Concept – How to Implement the Publish/Subscribe Pattern without a Centralised Message Broker

Petteri Kivimäki Nordic Institute for Interoperability Solutions (NIIS)

X-Road® is an open-source software and ecosystem solution that provides unified and secure data exchange between organisations. X-Road is a digital public good verified by the Digital Public Goods Alliance, and it’s released under the MIT open source.

Message Room is an asynchronous messaging concept that decouples message producers and consumers and enables publishing messages and events to multiple consumers. Instead of sending messages directly between two information systems, message producers publish their messages to a Message Room with any number of consumers. In practice, Message Room is an implementation of the publish/subscribe messaging pattern in X-Road. The difference compared to many other publish/subscribe implementations is that X-Road is based on a distributed architecture without a centralised message broker. Therefore, the Message Room concept provides a decentralised implementation of the publish/subscribe pattern.

In my talk, I’m going to give an overview of X-Road first. Then, I’m going to discuss the Message Room concept in more detail and how the publish/subscribe messaging pattern can be implemented without a centralised message broker.

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