Generating Feed Data

Gatling Feeders can be either from a file such as a csv or generated in code. This page explains how to generate your own feeder values. If you want to learn more about Gatling's built-in feeders visit the Gatling Docs page at https://gatling.io/docs/2.3/session/feeder/.

Generating Custom Data

A simple feed looks like the following:

def write = Iterator.continually(getRowData)

def getRowData = {
    Map(
      "order_no" -> UUID.randomUUID(),
      "numbers" -> Set(1, 2, 3) 
     )
}

The Iterator.continually() method will call the getRowData every time the feeder is called as part of the

When creating values in the Map it not necessary to convert to Java type or most CQL types. The Gatling DSE Plugin can auto-convert many types such as a Scala Set to a Java Set. To see all of the auto conversions supported visit: CQL Auto Type Conversion

Available Feeder Helper Functions and Methods

faker

Faker is a Java version of Ruby library that allows for easy functional faked data to be inserted into DSE. To read all of the methods available visit the java-faker project on Github.

Example

faker.bothify("???###???") -> "ase342dfs"

WeightedRandomGenerator(var items: List[(Any, Double)])

Create a Weighted Random list and get an item on each usage. This is used to create a random generator with the ability to set a percentage of time each value should be returned.

This class should be created at the Feeder class level and use .getItem in the Feeder map. To create a value in the list use a tuple with the (value, percentage) format example: ("orca", 60.0). The value can be any Scala type allowing for chaining of WeightedRandomGenerator and getRandom function.

Example

val randomAnimal = new WeightedRandomGenerator(List(("orca", 60.0), ("cat", 40.0)))
randomAnimal.getItem -> "orca"

getRandom(seq: Seq[T])

Select a random value from a Sequence, List or Array.

Example

getRandom(Seq(1, 2, 3)) -> 2

getJsonString

Converts a Scala Case class or Object into a JSON string.

Example

case class Example(test: String, value: Int)
getJsonString(Example("key", 2)) -> {"test": "key", "value": 2}

stripChar(str: String, replace: String, rWith: String)

Strip char from string.

Example

stripChar("2d6a0d3c-a416-40bd-afe8-3bab77da3f63", "-", "") -> 2d6a0d3ca41640bdafe83bab77da3f63

getCurrentTimestamp

Get current timestamp

Example

getCurrentTimestamp -> 2016-11-16 06:43:19.769

getRandomTimestamp(startTs: String = null, endTs: String = null)

Get a random timestamp between dates provided

Example

getRandomTimestamp(2012-01-01 00:00:00, 2017-01-01 00:00:00) -> 2016-11-12 03:34:22

getPrice

Alias for faker.commerce.price.toFloat

Example

getPrice -> 10.0

getRandomEpoch

Get a random epoch value between 2012-01-01 00:00:00 and 2017-01-01 00:00:00

Example

getRandomEpoch -> 1454284800

getUuid

Alias for UUIDs.random()

Example

getTimeUuid() -> 2d6a0d3c-a416-40bd-afe8-3bab77da3f63

getTimeUuid

Get a timeuuid using the current timestamp. Alias for DataStax Drivers UUIDs.timeBased()

Example

getTimeUuid() -> ff2b3e52-cd9c-11e7-abc4-cec278b6b50a

jsonDataGenerator

Generate random JSON string of preset size (1k, 10k, 55k) or a custom size using generate(). This is useful for simulating large text strings with structure into DSE.

Example

jsonDataGenerator.generate(15) -> "[{"_id":"57bdd47be9fea34733fbfc49","index":0,"guid":"645bb20a-26c3-41c3-b50a-61123dbc6404"..."