Gatling Java DSL

My favorite stress tool has been Gatling for many years now.

Scenarios are

• Easy to construct, It’s just code
• Easy to version. It’s just code
• Easy to run. It’s a simple command line that you launch in remote if needed
• Having great result graphs
• Easy to datamine. There is a simulation.log file that let’s you do some more digging when needed

My only complaints are

• You can’t change the running scenario
• It’s in Scala

The first one might be addressed by Gatling Frontline. I haven’t tried.

The second one is a bit more complicated to solve :-)

In fact, I don’t care that’s in Scala. But I would love to be able to core my scenario in Java.

So just for fun, I did a thought experiment. I’ve coded the Gatling API in Java and then coded the BasicScenario example using this API.

It’s not working for real

The API is just an emply shell. To know how different it would be from the Scala DSL.

The answer is: Not much.

My expectations were that I would need to rely on plenty of Java 8 features to get something close to the Scala DSl. But in fact, not even.

The main differences are:

• Variables are typed
• I’ve added a build method. But it’s just for style. I can get rid of it
• A bunch of semi-colons
• No syntactic sugar to create a map
• I’m using Duration is used to time units
• I need a run method where the setUp method is

That’s quite joyful and probably can be improved.

I’m now wondering if I could have used the Scala classes directly. I’m not good at making Java and Scala interacting.

So if someone is and want to try, please do so.