August 2026
308 pages
12h 3m
English
book
Message- and Event-Driven Systems with CQRS and Event Sourcing: Web and Cloud Architecture
by Alex Lawrence
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Chapter 9. Composing Data from Different Sources
Many software products have a need to provide information that is composed of data from different sources within a system. The primary consumers of such composite data structures are user interfaces, integrations with external software, and reporting functionalities. As with other query use cases, there is typically no strict requirement for strong consistency. Even more, varying consistency delays among individual data sources can be acceptable. One key design challenge with a composition of information is to avoid unnecessary coupling between the involved system parts. Also, an employed solution should degrade gracefully when individual sources are temporarily unavailable.
The composition of ...
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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.