JMS Message Matching

Gatling (Open-Source)
1

Hey Everyone,

I want to test a JMS service. However, the reply queue sends a different constructed XML message than the one sent to to the request queue. Is there a way in Gatling to match a field in the request message’s body with the same field in the response message’s body? Any help would be great.

2

Short answer is yes, Gatling can do that.

Start by reading up on Sessions (https://gatling.io/docs/current/session/) and especially Expression Language (https://gatling.io/docs/current/session/expression_el#expression-language). Then, read up on Checks (https://gatling.io/docs/current/http/http_check) paying particular attention to xpath. Once you have a basic understanding of the tools that Gatling provides you, if you have a specific question, ask.

3

Hi Ali,

We use custom Matcher to achieve this

object SQSMatcher extends JmsMessageMatcher {
  private val logger = LoggerFactory.getLogger(classOf[TapsToWhisperSimulation])

  override def prepareRequest(msg: Message): Unit = {}

  override def responseMatchId(msg: Message): String = getIdFromResponse(msg)

  override def requestMatchId(msg: Message): String = getIdFromRequest(msg)

  def getIdFromResponse(msg: Message): String = try {
    val dc = JsonPath.parse(msg.asInstanceOf[TextMessage].getText)
    var matcher: String = ""
    if (dc.read("$.header.Action").toString.equals("tokenized_tap")) { 
       matcher = dc.read("$.CardData.Token").toString
       logger.info("Received tokenized_tap for token " + matcher)
    } else if (dc.read("$.header.Action").toString.equals("funds_result")) {
      matcher = dc.read("$.FundsResult.Token").toString
      logger.info("Received funds_result for token " + matcher)
    } else {
      matcher = msg.asInstanceOf[TextMessage].getText
      logger.info("Ignore message with type " + dc.read("$.header.Action").toString)
      if(dc.read("$.header.Action").toString.equals("error")){
        logger.info("Error message details" + matcher)
      }
      logger.debug("Ignore message " + matcher)
    }
    matcher
  }
4

Thanks for the help John and Maria. Really solved my problem and made things easier.