selectIdVariationWithMurMurHash method

String? selectIdVariationWithMurMurHash(
  1. String visitorId,
  2. VariationGroup varGroup
)

Implementation

String? selectIdVariationWithMurMurHash(String visitorId, VariationGroup varGroup) {
  int hashAlloc;
  // We calculate the Hash allocation by the combination of : visitorId + idVariationGroup
  String combinedId = varGroup.idVariationGroup + visitorId;

  // Calculate the murmurHash algorithm
  hashAlloc = (MurmurHash.v3(combinedId, 0) % 100);
  Flagship.logger(
      Level.DEBUG,
      "########### The MurMurHash for the combined " +
          varGroup.idVariationGroup +
          " " +
          visitorId +
          " is : $hashAlloc #############");

  int offsetAlloc = 0;
  for (Variation itemVar in varGroup.variations) {
    if (hashAlloc < itemVar.allocation + offsetAlloc) {
      return itemVar.idVariation;
    }
    offsetAlloc += itemVar.allocation;
  }
  return null;
}