Updating a session Variable [Or remove and set]

[haripr...@gmail.com]

I have a list stored as a session variable. I want to update the list every time I make a request.

Since I didn't find a session.update() operation. I thought of calling remove and set methods in sessions

session.remove("reportNotifyList")
println("Am I there ? "+session.contains("reportNotifyList"))
val checkList = List(1,2,3,4,5)

session.set("reportNotifyList",finalList) 

This is not working as expected . The print statement after remove() is printing true

"Am I there ? true"

I can't find too many examples about updating session variable. Can somebody throw me some light to get past this.

Thanks in advance

[Stéphane LANDELLE]

It's all in the documentation: https://gatling.io/docs/gatling/reference/current/session/session_api/

--

Stéphane Landelle Chief Technical Officer

slan...@gatling.io gatling.io

   

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[haripr...@gmail.com]

Hello Stephane -

Obviously I read the document and the only relevant section i found about this is 

"set(key: String, value: Any): Session: add or replace an attribute"

I tried the set method to replace my session attribute which is "reportNotifyList" in this case. 

val firstList = session("reportNotifyList").as[String].substring(1,session("reportNotifyList").as[String].length-1).split(",").toList
println("firstList -->"+firstList)
val checkList = List(1,2,3,4,5)
session.set("reportNotifyList",checkList)
val secondList = session("reportNotifyList").as[String].substring(1,session("reportNotifyList").as[String].length-1).split(",").toList
println("finalList --> "+secondList)

this is what the println statement printed

firstList -->List(613917, 613916, 613896, 613871, 613877, 613881, 613888, 613970, 613977, 613981)

finalList --> List(613917, 613916, 613896, 613871, 613877, 613881, 613888, 613970, 613977, 613981)

Let me know what am i missing ? 

Thanks in advance

[Stéphane LANDELLE]

> Obviously I read the document

Well, still, you missed the important orange warning block.

Session instances are immutable!

Why is that so? Because Sessions are messages that are dealt with in a multi-threaded concurrent way, so immutability is the best way to deal with state without relying on synchronization and blocking.

A very common pitfall is to forget that set and setAll actually return new instances.

val session: Session = ???

// wrong usage
session.set("foo", "FOO") // wrong: the result of this set call is just discarded
session.set("bar", "BAR")

// proper usage
session.set("foo", "FOO").set("bar", "BAR")

--

Stéphane Landelle Chief Technical Officer

slan...@gatling.io gatling.io

   

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