/// <summary>
/// Aggregates two states loaded by the state loader and saves the resulting aggregation using the target state
/// persister.
/// </summary>
/// <param name="sourceA">The first state to load <see cref="IStateLoader"/></param>
/// <param name="sourceB">The second state to load <see cref="IStateLoader"/></param>
/// <param name="target">The target persister <see cref="IStatePersister"/></param>
public void AggregateStateTo(IStateLoader sourceA, IStateLoader sourceB, IStatePersister target)
{
Option <S> maybeStateA = sourceA.Load <S>(new Option <IAnalyzer <IMetric> >((IAnalyzer <IMetric>) this));
Option <S> maybeStateB = sourceB.Load <S>(new Option <IAnalyzer <IMetric> >((IAnalyzer <IMetric>) this));
S aggregated = (maybeStateA.HasValue, maybeStateB.HasValue) switch
{
(true, true) => maybeStateA.Value.Sum(maybeStateB.Value),
(true, false) => maybeStateA.Value,
(false, true) => maybeStateB.Value,
_ => null
};
target.Persist(new Option <IAnalyzer <IMetric> >((IAnalyzer <IMetric>) this), new Option <S>(aggregated));
}
/// <summary> /// Copy the state from source to target. /// </summary> /// <param name="source">The <see cref="IStateLoader"/> to read from.</param> /// <param name="target">The <see cref="IStatePersister"/> to write to.</param> public void CopyStateTo(IStateLoader source, IStatePersister target) => target.Persist(new Option <IAnalyzer <IMetric> >((IAnalyzer <IMetric>) this), source.Load <S>(new Option <IAnalyzer <IMetric> >((IAnalyzer <IMetric>) this)));