/// <summary>
/// Calculate a <see cref="Metric{T}"/> from a <see cref="State{T}"/>
/// </summary>
/// <param name="state">The <see cref="State{T}"/> to compute metrics from.</param>
/// <param name="aggregateWith">The <see cref="IStateLoader"/> for previous states to include in the computation.</param>
/// <param name="saveStateWith">The <see cref="IStatePersister"/>loader for previous states to include in the computation. </param>
/// <returns></returns>
public M CalculateMetric(Option <S> state, Option <IStateLoader> aggregateWith,
Option <IStatePersister> saveStateWith)
{
Option <S> loadedState = aggregateWith
.Select(value => value.Load <S>(new Option <IAnalyzer <IMetric> >((IAnalyzer <IMetric>) this)).Value);
Option <S> stateToComputeMetricFrom = AnalyzersExt.Merge(loadedState, state);
saveStateWith
.Select(persister =>
persister.Persist(new Option <IAnalyzer <IMetric> >((IAnalyzer <IMetric>) this), stateToComputeMetricFrom));
return(ComputeMetricFrom(stateToComputeMetricFrom));
}