A Humbly Arrogant Blog

Posts about software development

Observer pattern in golang

For some reason at some point, I thought it would be hard to implement the observer pattern in Go. Then I made an issue for me to blog about it. Well it’s not hard. It’s as easy as it is in every other language.

Observers

First part of the observer pattern is you need the actual observers. The logic that you want executed whenever something happens. Here I’ve just put a simple log print statement that will print out the name of the hook to the log.

Created an interface to allow for more flexible typing later on.

Observer Notifier

The main part of the logic, simply have an add observer and then have a process function that loops through and calls them all.

{% gist 9708081 observer.go %}

Full

Here is a copy of it all together. As you can see it’s really simple to whack together once you have a half decent understanding of Go.