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Event-Driven Architecture in Golang

Event-Driven Architecture in Golang

By : Michael Stack
4.9 (11)
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Event-Driven Architecture in Golang

Event-Driven Architecture in Golang

4.9 (11)
By: Michael Stack

Overview of this book

Event-driven architecture in Golang is an approach used to develop applications that shares state changes asynchronously, internally, and externally using messages. EDA applications are better suited at handling situations that need to scale up quickly and the chances of individual component failures are less likely to bring your system crashing down. This is why EDA is a great thing to learn and this book is designed to get you started with the help of step-by-step explanations of essential concepts, practical examples, and more. You’ll begin building event-driven microservices, including patterns to handle data consistency and resiliency. Not only will you learn the patterns behind event-driven microservices but also how to communicate using asynchronous messaging with event streams. You’ll then build an application made of several microservices that communicates using both choreographed and orchestrated messaging. By the end of this book, you’ll be able to build and deploy your own event-driven microservices using asynchronous communication.
Table of Contents (18 chapters)
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1
Part 1: Event-Driven Fundamentals
5
Part 2: Components of Event-Driven Architecture
12
Part 3: Production Ready

Implementing messaging with NATS JetStream

NATS (https://nats.io) is a very popular messaging broker that supports subject-based messaging and publish-subscribe (pub-sub). Core NATS also supports load-balanced queue groups, so the competing consumer pattern can be used to scale up for higher message processing rates. It does not support, at least at the time of writing this book, partitioned queues.

NATS is capable of distributing millions of messages a second and, compared with many other message brokers, it has an easy-to-use API and message model, as described here:

  • Subject: A string containing where the message is to be published or was published to.
  • Payload: A byte slice capable of holding up to 64 megabytes (MB); the NATS maintainers recommend smaller sizes, though.
  • Headers: A map of string slices indexed with strings, not unlike the headers from the standard library http package.
  • Reply: A string used to handle replying to an asynchronous request; we will...

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