private Maybe <T> TryGetNonAlreadyProvidedValues <T>(MemoizerKey memoizerKey, out SortedSet <object> alreadyProvidedValues, Func <T> generationFunction, int maxFailingAttempts)
{
alreadyProvidedValues = _memoizer.GetAlreadyProvidedValues(memoizerKey);
var maybe = GenerateNotAlreadyProvidedValue <T>(alreadyProvidedValues, maxFailingAttempts,
generationFunction);
return(maybe);
}
public SortedSet <object> GetAlreadyProvidedValues(MemoizerKey memoizerKey)
{
SortedSet <object> alreadyProvidedValues = null;
if (!_memoizer.ContainsKey(memoizerKey))
{
alreadyProvidedValues = new SortedSet <object>();
_memoizer[memoizerKey] = alreadyProvidedValues;
}
else
{
alreadyProvidedValues = _memoizer[memoizerKey];
}
return(alreadyProvidedValues);
}
private T GenerateWithoutDuplication <T>(MethodBase currentMethod, int argumentsHashCode, int maxFailingAttemptsBeforeLastChanceFunctionIsCalled,
Func <T> regularGenerationFunction, Func <SortedSet <object>, Maybe <T> > lastChanceGenerationFunction = null)
{
var memoizerKey = new MemoizerKey(currentMethod, argumentsHashCode);
var maybe = TryGetNonAlreadyProvidedValues <T>(memoizerKey, out var alreadyProvidedValues, regularGenerationFunction, maxFailingAttemptsBeforeLastChanceFunctionIsCalled);
if (!maybe.HasItem && lastChanceGenerationFunction != null)
{
// last attempt, we randomly pick the missing bits from the memoizer
maybe = lastChanceGenerationFunction(_memoizer.GetAlreadyProvidedValues(memoizerKey));
}
if (!maybe.HasItem)
{
throw new DuplicationException(typeof(T), maxFailingAttemptsBeforeLastChanceFunctionIsCalled, alreadyProvidedValues);
}
alreadyProvidedValues.Add(maybe.Item);
return(maybe.Item);
}