May 2019
Intermediate to advanced
344 pages
10h 44m
English
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Chapter 9. Commands
This chapter covers
- Understanding the role of commands in the unified log
- Modeling commands
- Using Apache Avro to define schemas for commands
- Processing commands in our unified log
So far, we have concerned ourselves almost exclusively with events. Events, as we explained in chapter 1, are discrete occurrences that take place at a specific point in time. Throughout this book, we have created events, written them to our unified log, read them from our unified log, validated them, enriched them, and more. There is little that we have not done with events!
But we can represent another unit of work in our unified log: the command. A command is an order or instruction for a specific action to be performed in the future—each ...
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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.
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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.