Session variable question

Gatling (Open-Source)
1

Hi. I’ve been using Gatling for the past week and I’m a bit stuck at what seems to be a simple issue. I’m new to scala.

I basically want to know if a session variable is set or not. The code I’m working on looks like this at the moment:

.exec((s: Session) =>
if (s.getAttribute(“myVariable”) != null)
println(“The variable is set”)
)

What can I change “!= null” with, to make this code print “The variable is set” when it is in fact set, and do nothing when it is not?

For context, this is my scenario: “Call A” precedes “Call B” and “Call B” is dependent on information in the response of “Call A”. I want to stop “Call B” from executing if “Call A” failed (or returned non useable data).

Sincerely
Espen Nersveen

2

Hi Espen,

As you can see here (https://github.com/excilys/gatling/blob/1.0-maintenance/gatling-core/src/main/scala/com/excilys/ebi/gatling/core/session/Session.scala#L63), the returned result of the getAttribute function if there is nothing found is EMPTY (or “”, the empty string) :slight_smile:

So you should test against “” instead:

if (s.getAttribute(“myVariable”) != “”)

However, I think this will change in 1.1, not sure though :wink:

Hope this helps :slight_smile:

Cheers,
Romain

3

Hi Espen,

Would it be possible for you to use the 1.1.0-SNAPSHOT (as explained in the thread I just opened)?

In 1.1.0, here’s what your function should look like :

.exec((s: Session) =>
if (s.isAttributeDefined(“myVariable”))
println(“The variable is set”)
s
)

Cheers,

Steph

2012/3/12 Espen Nersveen <espen.nersveen@gmail.com>

4

Thank you for a quick answer.

As for running 1.1.0-SNAPSHOT. I have a parallell task trying to get it to run on that version, but so far not completed. Some issues still remain on cookie and session handling. I will redirect my efforts on converting to 1.1.0-SNAPSHOT.

Thank you
Espen Nersveen

5

Thanks for the quick answer.

I have tried to check for an empty String and this is the result:
15:35:38.704 [akka:event-driven:dispatcher:global-11][WARN ] c.e.e.g.c.s.Session - No Matching Attribute for key: ‘myVariable’ in session

1.1 has another version, but I’m not able to run on 1.1 just yet. Some issues still remain.

Thank you
Espen Nersveen

6

Hi Espen,

The warning is not harmful and will not prevent you from running your simulations. The getAttribute method was intended for what it is named: getting the value of an attribute.

This is why an isAttributeDefined method has been created in 1.1 :slight_smile:

As for your concerns about migrating to 1.1, what issues are you talking about?

Cheers,
Romain

7

I have to delve a bit deeper into the debug-logged script to find out
what is wrong. I'll try to get it up and running on 1.1.0-SNAPSHOT now
and get back to you when I have more information. I will leave the
1.0.3 version for now.

Thanks for the help
espen