Try<Nothing> QoSCorrectionObserver::doQosDecision() {
if (contentions.get().empty() ||
ResourceUsageHelper::getRevocableExecutors(usage.get()).empty()) {
SERENITY_LOG(INFO) << "Empty contentions received.";
emptyContentionsReceived();
// Produce empty corrections and contentions
produceResultsAndClearConsumedData();
return Nothing();
}
if (iterationCooldownCounter.isSome()) {
SERENITY_LOG(INFO) << "QoS Correction observer is in cooldown phase";
cooldownPhase();
// Produce empty corrections and contentions
produceResultsAndClearConsumedData();
return Nothing();
}
Try<QoSCorrections> corrections = newContentionsReceived();
if (corrections.isError()) {
SERENITY_LOG(INFO) << "corrections returned error: " << corrections.error();
// Produce empty corrections and contentions
produceResultsAndClearConsumedData();
return Error(corrections.error());
}
if (corrections.get().empty()) {
SERENITY_LOG(INFO) << "Strategy didn't found aggressors";
// Strategy didn't found aggressors.
// Passing contentions to next QoS Controller.
produceResultsAndClearConsumedData(QoSCorrections(),
this->contentions.get());
return Nothing();
}
// Strategy has pointed aggressors, so don't pass
// current contentions to next QoS Controller.
iterationCooldownCounter = this->cooldownIterations;
produceResultsAndClearConsumedData(corrections.get(),
Contentions());
return Nothing();
}
Try<Nothing> QoSCorrectionObserver::correctAgent() {
// Consumer base code ensures we have needed information here.
if (!this->currentContentions.isSome() || !this->currentUsage.isSome())
return Nothing();
// Allowed to interpret contention using different algorithms.
Try<QoSCorrections> corrections =
this->revStrategy->decide(ageFilter,
this->currentContentions.get(),
this->currentUsage.get());
if (corrections.isError()) {
// In case of Error produce empty corrections.
produce(QoSCorrections());
} else {
produce(corrections.get());
}
this->currentContentions = None();
this->currentUsage = None();
return Nothing();
}
