March 2025
Intermediate to advanced
202 pages
4h 45m
English
Content preview from Real-World Event SourcingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Reacting to Injected Events
The code to react to an injected event is easy: just handle the event. The trick, as with all things event-sourced, is how to design the model properly. When evaluating whether something should be injected and where it should be injected, you can ask these questions:
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Does the external event represent something important to the components in your system?
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Does the event occur without the aid of an internal command?
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Does the occurrence of the event have meaning beyond the ephemeral state?
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Does the occurrence of the event also affect the state of an aggregate in your system?
If an external event occurs without the aid of a command in your system but its occurrence signifies something important that can impact projections, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.