How to implement a recursive call inside jmeter?

Question

I need to simulate a test scenario where my application sends a request with 100s of queries. On the back-end, this request is broken down into requests containing a single query each. So a request from Jmeter with 100 queries will become 100 requests on the back-end. Now - the response from the back-end could either contain the requested data for each of those queries OR contain a unique queryID. Sending back a queryID is server's way of telling that this query is still running. For example, if Jmeter sends a request with 100 queries, it might get back data for 80 and 20 unique queryIDs. So my application under test makes a callback request with those 20 queryIDs every 15 seconds until it gets back the requested data or timeout.

Here is what I have implemented so far.

-main_request_with_100_queries
--XPath_extractor_to_extract_any_queryIDs_found
-if_controller_to_check_if_queryID_MatchNr_is_greater_than_0
--15_second_pause
--beanshell_preprocessor_to_create_the_request_body_with_all_queryIDs
--callback_request_with_queryIDs

What I want to implement is to have another XPath extractor for my callback_request and if any queryIDs are found, then go back to the if_controller

I'm trying to make this work by using a module_controller but so far no luck. Has anyone ever implemented something like this? Can anyone suggest some ideas?

vins vins · Accepted Answer · 2016-10-04T15:37:48

You can use While Controller to keep making the request until there is a queryID in the response.

While Controller [ "${querid.present}"=="true" ]
   HTTP Request
     Pre Processor [to_create_the_request_body_with_all_queryIDs]
     Post Processor [to check for query ID. if no query id  - change querid.present to false ]

If possible, try to use Regular Expression Extractor. xpath is very slow and might affect your performance of the script. Check here for more details.

Creating modular test script in JMeter.

How to implement a recursive call inside jmeter?

1 Answers