recordShow method
Record one show on "Digia Experience Viewed".
Implementation
void recordShow(CampaignModel campaign) {
final policy = campaign.frequency;
if (policy == null || !policy.hasConstraint) return;
final next = FrequencyEvaluator.recordShow(
policy,
_load(campaign.campaignKey),
_clock(),
_sessionIdProvider(),
);
_save(campaign.campaignKey, next);
}