Slf4j Implementation in Gatling inorder to save session values to a external file

[Shobitha S]

Hi All, 

Greetings!!

I want to write captured regex results from HTTP responses to an external file. I already referred to this link (https://groups.google.com/forum/#!topic/gatling/hpUECuX9Fc4) but not able to find a correct syntax. Also I already have TRACE method enabled in logback.xml (attached the logback.xml with this message)  it is working fine but since the HTTP responses are really huge , I just want to save specific values within HTTP response to a external file. 

For now I am using the below code to write to a file I knew this is not threadsafe and does not support concurrency,

.exec( session => {

                                                val fout = new FileWriter("CartID.log", true)

                                                val fileout = new PrintWriter(new BufferedWriter(fout))

                                               

                                                fileout.print(session( "cartID" ).as[String])

                                                fileout.println()

                                                fileout.close()

                                                session})

 

I got to know that slf4j is a better method that supports concurrency, in this link https://groups.google.com/forum/#!topic/gatling/hpUECuX9Fc4 there is a small piece of code showing slf4j implementation within a scala file but that does not seem to work with latest version of Gatling even after importing the following slf4j packages .  Looking forward to this forum to help me get away from this issue.

 

import org.slf4j.Logger._

import org.slf4j.LoggerFactory._

Regards,

Shobitha

[Shobitha S]

In addition to my previous message, I get the below given error messages when trying to compile the following code

val logger = org.slf4j.LoggerFactory.getLogger(this.getClass)

.exec { session => logger.debug(session("versionNum").as[String]);

session }

or 

val logger = org.slf4j.LoggerFactory.getLogger("myDebugLogger")

.exec(session => {

logger.debug(session.getAttribute("versionNum"))

session})

Compilation errors:

value exec is not a member of org.slf4j.Logger 

possible cause: maybe a semicolon is missing before `value exec'?

21926 [main] ERROR io.gatling.compiler.ZincCompiler$ - .exec(session => {

recursive value logger needs type

22158 [main] ERROR io.gatling.compiler.ZincCompiler$ - .exec { session => logger.debug(session("versionNum").as[String]);

[Shobitha S]

Hi All, 

I was able to successfully implement Slf4j logger in my Gatling script. I browsed through http://www.slf4j.org/manual.html#binding and got the needed solution, 

This is how I did the implementation of slf4j, 

Following statements should be added to the scala file,

import org.slf4j.Logger._

import org.slf4j.LoggerFactory._

then I added following block of statement to my scala file, 

.exec(session => {

val logger = org.slf4j.LoggerFactory.getLogger(this.getClass)

logger.info("The version number is ********************************************* ")

logger.info(session ("versionNum").as[String])

session})

In addition to this, please ensure you add slf4j-api-1.7.13.jar to your system class path.