/// <summary>
/// Get the stats of Mutants and Humans.
/// </summary>
/// <returns>DNA stats</returns>
public async Task <DnaStats> GetDnaStatsAsync()
{
//I made both calls in parallel, using memory cache
Task <int> mutantsTask = _memoryCacheService.GetAsync("mutantsCount", () => _dnaService.GetMutantsCountAsync());
Task <int> humansTask = _memoryCacheService.GetAsync("humansCount", () => _dnaService.GetHumansCountAsync());
//then, I await the results and set the ratio
int mutants = await mutantsTask;
int humans = await humansTask;
decimal ratio = mutants;
if (humans > 0)
{
ratio /= humans;
}
ratio = Math.Round(ratio, 2);
//finally, I return the results
return(new DnaStats()
{
CountMutantDna = mutants,
CountHumanDna = humans,
Ratio = ratio
});
}
/// <summary>
/// Detects if a human is a mutant through its dna chain.
/// </summary>
/// <exception cref="ArgumentNullException">Thrown when human parameter is null</exception>
/// <exception cref="DnaInvalidException">Thrown when dna chain is not valid</exception>
/// <param name="human">Human being with a Dna chain</param>
/// <returns>True if it's mutant; false if not.</returns>
public virtual async Task <bool> IsMutantAsync(Human human)
{
//pre-conditions
if (human == null)
{
throw new ArgumentNullException(nameof(human));
}
string[] dna = human.Dna;
bool isMutant = false;
//first at all, I have to validate the dna
if (IsDnaValid(dna))
{
string chainString = string.Join(",", dna);
Dna savedDna = await _memoryCacheService.GetAsync(chainString, () => _dnaService.GetByChainAsync(dna));
if (savedDna != null)
{
//I get the saved value
isMutant = savedDna.IsMutant;
}
else
{
//I save the verified entity
isMutant = VerifyIsMutant(dna);
Dna dnaEnt = new Dna()
{
ChainString = chainString,
IsMutant = isMutant
};
await MemoryCacheService.TriggerSaveActionAsync(dnaEnt, 1, (ICollection <Dna> dnas) => _dnaService.SaveAsync(dnas));
}
}
return(isMutant);
}
