/**
* @param $splitCacheKey
* @return null|SplitView
*/
private function getSplitByCacheKey($splitCacheKey)
{
$splitCachedItem = SplitApp::cache()->getItem($splitCacheKey);
if ($splitCachedItem->isHit()) {
$splitRepresentation = $splitCachedItem->get();
$split = new Split(json_decode($splitRepresentation, true));
return new SplitView($split->getName(), $split->getTrafficTypeName(), $split->killed(), $split->getTreatments(), $split->getChangeNumber());
}
return null;
}
private function evalTreatment($matchingKey, $bucketingKey, $featureName, array $attributes = null)
{
$split = null;
$do_evaluation = false;
$cachedFeature = $this->getCachedFeature($featureName);
if ($cachedFeature !== null) {
$split = $cachedFeature;
$do_evaluation = true;
} else {
$splitCacheKey = SplitCache::getCacheKeyForSplit($featureName);
$splitCachedItem = SplitApp::cache()->getItem($splitCacheKey);
if ($splitCachedItem->isHit()) {
SplitApp::logger()->info("{$featureName} is present on cache");
$splitRepresentation = $splitCachedItem->get();
$split = new Split(json_decode($splitRepresentation, true));
$this->cacheFeature($featureName, $split);
$do_evaluation = true;
}
}
if ($do_evaluation) {
//If the split was killed, log the impression and return default treatment.
if ($split->killed()) {
$defaultTreatment = $split->getDefaultTratment();
$chn = $split->getChangeNumber();
$this->logImpression($matchingKey, $featureName, $defaultTreatment, ImpressionLabel::KILLED, $chn);
return $defaultTreatment;
}
$timeStart = Metrics::startMeasuringLatency();
$treatment = Engine::getTreatment($matchingKey, $bucketingKey, $split, $attributes);
$latency = Metrics::calculateLatency($timeStart);
//If the given key doesn't match on any condition, default treatment is returned
$impressionLabel = '';
if ($treatment == null) {
$treatment = $split->getDefaultTratment();
$impressionLabel = ImpressionLabel::NO_CONDITION_MATCHED;
}
//Registering latency value
MetricsCache::addLatencyOnBucket(Metrics::MNAME_SDK_GET_TREATMENT, Metrics::getBucketForLatencyMicros($latency));
SplitApp::logger()->info("*Treatment for {$matchingKey} in {$split->getName()} is: {$treatment}");
//Logging treatment impressions
$this->logImpression($matchingKey, $featureName, $treatment, $impressionLabel, $split->getChangeNumber());
//Returning treatment.
return $treatment;
}
// Split not found impression
$this->logImpression($matchingKey, $featureName, TreatmentEnum::CONTROL, ImpressionLabel::SPLIT_NOT_FOUND);
SplitApp::logger()->warning("The SPLIT definition for '{$featureName}' has not been found'");
return TreatmentEnum::CONTROL;
}