Gatling Code Fragments - Revision history

PeterHarding at 22:19, 27 April 2021

2021-04-27T22:19:00Z

← Older revision		Revision as of 08:19, 28 April 2021
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	=Approaches for Dynamic Feeder Assignment=		=Approaches for Dynamic Feeder Assignment=

			See Gatling documentation - https://gatling.io/docs/current/session/feeder/


	From - https://stackoverflow.com/questions/24533162/gatling-dynamic-feed-selection		From - https://stackoverflow.com/questions/24533162/gatling-dynamic-feed-selection

PeterHarding at 22:18, 27 April 2021

2021-04-27T22:18:05Z

← Older revision		Revision as of 08:18, 28 April 2021
Line 2:		Line 2:

	From - https://stackoverflow.com/questions/24533162/gatling-dynamic-feed-selection		From - https://stackoverflow.com/questions/24533162/gatling-dynamic-feed-selection


			==One Approach==

			Feeders are instantiated at the same time as the Simulation. You can't defer it to the Simulation runtime, unless you hack with the underlying tools.

			How many of those files do you have? If you have just a few "groupid" files, you could use either doSwitch.

			<pre>
			.doSwitch("${groupid}") (
			"foo" -> feed(csv("foo.csv").random),
			"bar" -> feed(csv("bar.csv").random)
			)
			</pre>

			This can be generalized:

			<pre>
			def groupIdFeed(groupId: String) = groupId -> feed(csv(groupId + ".csv").random)

			.doSwitch("${groupid}") (
			groupIdFeed("foo"),
			groupIdFeed("bar")
			)
			</pre>

			==An Alternative==

	Define data so:		Define data so:

PeterHarding: Created page with "=Approaches for Dynamic Feeder Assignment= From - https://stackoverflow.com/questions/24533162/gatling-dynamic-feed-selection Define data so:

 object Data {    var gro..."

2021-04-27T22:12:55Z

Created page with "=Approaches for Dynamic Feeder Assignment= From - https://stackoverflow.com/questions/24533162/gatling-dynamic-feed-selection Define data so: <pre> object Data { var gro..."

New page

=Approaches for Dynamic Feeder Assignment=

From - https://stackoverflow.com/questions/24533162/gatling-dynamic-feed-selection

Define data so:

<pre>
object Data {

var groupList : List[Int] = List( ... ) // long list of IDs

def branchByGroup ( path: String ) : ChainBuilder = {
var c = bootstrap
groupList.foreach( x => {
c = c.doIf( "${groupId}", x.toString() ) {
feed( csv( path + "/" + x.toString() + ".csv" ).random )
}
})
return c
}

def searchCriteria () : ChainBuilder = branchByGroup( "search" )
def other() : ChainBuilder = branchByGroup( "other" )
}
</pre>

Then, inside the scenario:

<pre>
def scn = scenario("My Scenario")
.feed( credentialSource )
.exec( Login.steps )
.during( loopTime ) {
Data.searchCriteria()
.exec( Search.steps )
</pre>

The call to Data.searchCriteria is injecting the .doIf() calls into the chain. If it was not the first thing in the block, it would have to be wrapped it in .exec() of course.

Notice the part that says c = c.doIf - the function needs to return the END of the chain, as opposed to the beginning. You can't build a chain by attaching everything to the first link in the chain! Simulating what the DSL does requires this call-and-assign approach.

[[Category:Gatling]]
[[Category:Scala]]