January 2017
Intermediate to advanced
565 pages
13h 46m
English
Content preview from Clojure: High Performance JVM ProgrammingBecome 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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Atoms
We have now seen how promises, futures, and transactions work in Clojure. We'll now see atoms.
Even though STM is very useful and powerful you'll see that in practice it is not very commonly used.
Atoms are one of Clojure's workhorses, when it comes to concurrent programming.
You can think of atoms as transactions that modify one single value. You might be thinking, what good is that? Imagine you had lots of events that you want to store in a single vector. If you are used to Java, you probably know that using a java.util.ArrayList package is bound to have problems; since, you are almost surely going to lose data.
In that case, you probably want to use a class from the java.util.concurrent package, how can you guarantee that you'll have no data ...
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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.