Jmeter Dynamic array creation using matched dynamic values

Scenario:Create a dynamic array , from Jmeter correlated values/Dynamic values.

My application gives a Json response for the sampler (Get Dynamic Json response) , from that json response we need to capture dynamic values (global_property_ids) and pass all caputed dynamic values (global_property_id's) as an array to next post request. Below are the steps.

Download this Project from github

Step 1: Add thread group 

Step 2: Add "http request" sampler with below details to get "json Response" ,that contains  dynamic values of global_property_ids . Add server IP,PORT,Protocol,Method and URI 

Server IP: raw.githubusercontent.com
Port Number:80
Protocol : https
Method: Get
URI or PATH: /mcheepati/api/master/response.json

Step 3: Add the "View Results tree" to the "Thread Group" and  Run the Jmeter test using Ctrl+r
and see the results from "View Results" 


We need to correlate all request_id , to do this see the Step 4

Step 4: To capture dynamic values , add the "Regular expression extractor" from Jmeter "Post Processor"  as a child to this sampler (Step 2) 
  

 



Note: Match No. should be -1 (minus 1).Which will capture all the matched values. 

Step 5: Check , Regular Expression by selecting  "RegExp Tester" from "View Results tree".

Our Regular expression is correct, so it displayed all the  " request_id" values. See more details above highlighted with red line 

Step 6:Add "Http Request" Sampler as next request in "Thread Group" , add pass the dynamic array (arrayOutPut) to this request as post method. Please see details below

IP      : LocalHost
Port   :8080
PATH :/
Post Parameter:
request_ids_array:[${arrayOutPut}]

Step 7: This Step is very Important , we are creating dynamic array in this step only. 

Add "Bean Shell Pre-Processor" as a child to Step 6 and using bean shell script to create dynamic array.

Below is the Code

int count = Integer.parseInt(vars.get("request_id_matchNr"));
String delimiter = ",";
StringBuffer sb = new StringBuffer();
for(int i=1;i<=count;i++) {
 sb.append(vars.get("request_id_" + i));
 if (i == count){
 break; //to eliminate comma after the array
 }else {
  sb.append(delimiter);
 }
}
 vars.put("arrayOutPut",sb.toString());

Step 8: Run the Jmeter (CTRL+r) and verify the results

int count = Integer.parseInt(vars.get("request_id_matchNr"));
//creating String using dynamic values "request_id_"
 //Converting StringBuilder to String
 //Creating string Array from string
 //Creating Integer array from string array
//Sorting Integer array 
//Converting Integer array to string
        
Below is the jmeter output after using above code in "Beanshell preprocessor"

Step 9: If you want sorted array , use below code in "Beanshell Preprocessor "

log.info("Count is:"+count);

String delimiter = ",";

StringBuffer beforeSort = new StringBuffer();

for(int i=1;i<=count;i++) { 

beforeSort.append(vars.get("request_id_" + i));

log.info("values is:"+vars.get("request_id_" + i));

 if (i == count){

 break; //to eliminate comma after the array

 }else {

  beforeSort.append(delimiter);

 }

}

 log.info("Before Sort the string is :"+beforeSort);

 String stringBuilderToString=beforeSort.toString();

 String[] numbers = stringBuilderToString.split(",");

 Integer[] intValues = new Integer[numbers.length];

        for (int i = 0; i < numbers.length; i++) {

            intValues[i] = Integer.parseInt(numbers[i].trim());

        }

 Collections.sort(Arrays.asList(intValues));

StringBuilder builder = new StringBuilder();

        for (int i = 0; i < intValues.length; i++) {

            Integer intValue = intValues[i];

            builder.append(intValue);

            if (i < intValues.length - 1) {

                builder.append(", ");

            }

        }

  log.info("sort is :"+builder);      

 vars.put("arrayOutPut",builder.toString());

Below is the code block in Jmeter