/// <summary>
/// Calculates performance for the given <see cref="ScoreInfo"/>.
/// </summary>
/// <param name="score">The score to do the calculation on. </param>
/// <param name="token">An optional <see cref="CancellationToken"/> to cancel the operation.</param>
public Task <double?> CalculatePerformanceAsync([NotNull] ScoreInfo score, CancellationToken token = default)
{
var lookupKey = new PerformanceCacheLookup(score);
if (performanceCache.TryGetValue(lookupKey, out double performance))
{
return(Task.FromResult((double?)performance));
}
return(computePerformanceAsync(score, lookupKey, token));
}
protected override async Task <PerformanceAttributes> ComputeValueAsync(PerformanceCacheLookup lookup, CancellationToken token = default)
{
var score = lookup.ScoreInfo;
var attributes = await difficultyCache.GetDifficultyAsync(score.BeatmapInfo, score.Ruleset, score.Mods, token).ConfigureAwait(false);
// Performance calculation requires the beatmap and ruleset to be locally available. If not, return a default value.
if (attributes?.Attributes == null)
{
return(null);
}
token.ThrowIfCancellationRequested();
return(score.Ruleset.CreateInstance().CreatePerformanceCalculator()?.Calculate(score, attributes.Value.Attributes));
}
private async Task <double?> computePerformanceAsync(ScoreInfo score, PerformanceCacheLookup lookupKey, CancellationToken token = default)
{
var attributes = await difficultyManager.GetDifficultyAsync(score.Beatmap, score.Ruleset, score.Mods, token);
// Performance calculation requires the beatmap and ruleset to be locally available. If not, return a default value.
if (attributes.Attributes == null)
{
return(null);
}
token.ThrowIfCancellationRequested();
var calculator = score.Ruleset.CreateInstance().CreatePerformanceCalculator(attributes.Attributes, score);
var total = calculator?.Calculate();
if (total.HasValue)
{
performanceCache[lookupKey] = total.Value;
}
return(total);
}