Random .param name

[Andrei Proskurin]

Hi!
Thanks for the Gatling tool. It is amazing. However, I came across a problem, that I am not yet able to resolve myself. I have a .param with a name, for example, """deleteForm3_hf_0""". The part after "hf" is generated dynamically. How can I write the script so that this parameter name would not matter?

[Stéphane Landelle]

Hi,

I'm not sure what you mean.

Do you need to generate this name randomly, or capture it from the page?

If the former, you can try something like:

session => "deleteForm3_hf_" + ThreadLocalRandom.current.nextInt(0, 100)

If the latter, check out https://github.com/excilys/gatling/wiki/Checks

2014-07-01 10:43 GMT+02:00 Andrei Proskurin <andrei.pr...@gmail.com>:

Hi!
Thanks for the Gatling tool. It is amazing. However, I came across a problem, that I am not yet able to resolve myself. I have a .param with a name, for example, """deleteForm3_hf_0""". The part after "hf" is generated dynamically. How can I write the script so that this parameter name would not matter?

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[Andrei Proskurin]

For example, if in:
.get("/delete_this_declaration-12-delete") link, I want "12" as a random number, would it be syntactically correct to use:

.get("/delete_this_declaration-"+ThreadLocalRandom.current.nextInt(0, 100)+"-delete")

[Stéphane Landelle]

As I wrote in my previous email, you have to pass a function. Otherwise, your parameter will only be a value and it will be evaluated only once, when the Simulation is loaded.

[Andrei Proskurin]

Ok. I only started with Gatling and Scala yesterday, so could you give me a tip on where can I find some info on my problem, as I didn't understand much from the last email. But thank you for your assist!

[Stéphane Landelle]

Doc: https://github.com/excilys/gatling/wiki/Advanced-Usage#scala-functions

Your previous example:

.get("/delete_this_declaration-"+ThreadLocalRandom.current.nextInt(0, 100)+"-delete") // wrong, get parameter is only evaluated once

.get(session => "/delete_this_declaration-"+ThreadLocalRandom.current.nextInt(0, 100)+"-delete") // right, get parameter is a lambda that will be evaluated for every request to be sent

[Andrei Proskurin]

Thanks! I got this to work. But what if instead of random ThreadLocalRandom.current.nextInt(0, 100) I needed a number that would increment for each session. For first user it would be 1, for second - 2 etc. What could I use then?

[Stéphane Landelle]

Back to basics, maybe? :)

http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/atomic/AtomicInteger.html#incrementAndGet()

[Andrei Proskurin]

So I should declare a variable in scenario and make it 0. Then I insert it where I need it and put increment? Something like:

val number = 0;

scn(...)
.get(session => "somePartOfUrl_"+incrementAndGet(number)+"_someOtherPartOfUrl")

[Stéphane Landelle]

Close :)

val number = new AtomicInteger(); // default value is 0

scn(...)
.get(session => "somePartOfUrl_"+ number. incrementAndGet +"_someOtherPartOfUrl")

[Andrei Proskurin]

Thanks! Worked like a charm. Is it ok that I ask such noobish questions here?

[Stéphane Landelle]

No pro, I don't mind explaining simple things as long as I don't have to explain them twice :)