Name: Idempotence: How to Make Sure You Only Do It Once with Ethan (and Pizza!)
Start: 2023-03-16T19:00:00-06:00
End: 2023-03-16T21:00:00-06:00
Location: Vivint

Level up your system design skills and make your users' lives better with this one weird trick.

Have you ever seen a submit button get disabled after clicking it?
Have you ever seen the same comment twice in a row on a blog?
Have you ever seen the same comment twice in a row on a blog?

It seems like some team didn't make their system idempotent.

Idempotent literally means "same power", and it's a concept that will make your APIs more robust, make it so your microservices can function at all, and provide lots of fun when trying to figure out how to pronounce it

Simply put, when an idempotent operation is called once or called a million times, the end result is exactly the same. Did you get a network failure during your API call, and you're not sure if you actually charged your customer's credit card? Not a problem if your API is idempotent. Did your autonomous microservice just encounter a message it has already handled, and you're not sure if you should wire the 10 million dollars again? Not a problem if your handlers are idempotent.

We'll go through principles of idempotence as well as looking at a way to code up idempotent operations.

Ethan is aSystems Architect at Aumni.

**Links:**
[practicalmicroservices.com](http://practicalmicroservices.com/)
[twitch.tv/ethangarofolo](http://twitch.tv/ethangarofolo)

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Idempotence: How to Make Sure You Only Do It Once with Ethan (and Pizza!)

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