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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

Making the Store Management module asynchronous

We are going to update the Store Management module to publish integration events and will also update the Shopping Baskets module to receive messages. The Shopping Baskets module will not be doing much more than logging the receipt of the message. Using the data will come in handy in the next chapter when we learn about event-carried state transfer.

Modifying the monolith configuration

Starting with a simple configuration for NATS, we need a Uniform Resource Locator (URL) to connect to and a name for our stream. Of course, both could be hardcoded or put into variables in the code, but I run the application from a Docker container and without. The stream name is used in a few places, so having it be part of the configuration for the application is the lazy option. The code is illustrated here:

NatsConfig struct {
    URL    string `required:"true"`
    Stream...

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