@splitsoftware/splitio-commons/esm/trackers/strategy/strategyOptimized.js

Split JavaScript SDK common components

import { truncateTimeFrame } from '../../utils/time';
/**
 * Optimized strategy for impressions tracker. Wraps impressions to store and adds previousTime if it corresponds
 *
 * @param impressionsObserver - impression observer. previous time (pt property) is included in impression instances
 * @param impressionCounts - cache to save impressions count. impressions will be deduped (OPTIMIZED mode)
 * @returns Optimized strategy
 */
export function strategyOptimizedFactory(impressionsObserver, impressionCounts) {
    return {
        process: function (impression) {
            // DEBUG mode without previous time, for impressions with properties
            if (impression.properties)
                return true;
            impression.pt = impressionsObserver.testAndSet(impression);
            var now = Date.now();
            // Increments impression counter per featureName
            if (impression.pt)
                impressionCounts.track(impression.feature, now, 1);
            // Checks if the impression should be added in queue to be sent
            return (!impression.pt || impression.pt < truncateTimeFrame(now)) ? true : false;
        }
    };
}