public async Task <PredictionResponse> Predict(PredictionRequest predictionRequest)
{
var guid = Guid.NewGuid().ToString();
var predictionResponseItem = new PredictionResponseItem();
var response = new PredictionResponse();
var databaseContext = this.CreateContext();
var cache = await databaseContext.PredictionRequests.Where(g => g.Guid == guid).ToListAsync();
await this.InsertRequests(predictionRequest, guid);
foreach (var loopItem in predictionRequest.Items)
{
predictionResponseItem = new PredictionResponseItem();
await CalculateProbability(loopItem, predictionResponseItem);
response.Predictions.Add(predictionResponseItem);
}
// Experiment
if (this.serviceConfiguration.ExperimentEnabled)
{
await this.InsertFilePredictionForExperiment(predictionRequest, guid);
response = await this.FilterResponseForExperiment(predictionRequest, response);
}
return(response);
}
private async Task <PredictionResponse> FilterResponseForFileMode(PredictionRequest request, PredictionResponse response)
{
using (var databaseContext = this.CreateContext())
{
var index = 0;
foreach (var item in request.Items)
{
var filePrediction = await databaseContext.FilePredictions
.Where(file => file.FileName == item.Path)
.SingleOrDefaultAsync();
if (filePrediction == null)
{
return(response);
}
if (filePrediction.PredictionEnabled)
{
response.Predictions[index].SuccessProbability = null;
response.Predictions[index].ProbableSuccess = null;
}
index++;
}
}
return(response);
}
private async Task InsertRequests(PredictionRequest predictionRequest, string guid)
{
using (var databaseContext = this.CreateContext())
{
foreach (var loopItem in predictionRequest.Items)
{
var requestCache = databaseContext.PredictionRequests.Create();
requestCache.Guid = guid;
requestCache.Author = loopItem.Author;
requestCache.Path = loopItem.Path;
requestCache.OldPath = loopItem.OldPath;
requestCache.NumberOfDistinctCommitters = loopItem.NumberOfDistinctCommitters;
requestCache.NumberOfModifiedLines = loopItem.NumberOfModifiedLines;
requestCache.NumberOfRevisions = loopItem.NumberOfRevisions;
requestCache.TotalNumberOfRevisions = loopItem.TotalNumberOfRevisions;
requestCache.PreviousBuildResult = loopItem.PreviousBuildResult;
requestCache.ProjectName = predictionRequest.ProjectName;
requestCache.CCMMd = loopItem.CCMMd;
requestCache.CCMAvg = loopItem.CCMAvg;
requestCache.CCMMax = loopItem.CCMMax;
requestCache.CreatedAtUtc = DateTime.UtcNow;
databaseContext.PredictionRequests.Add(requestCache);
}
await databaseContext.SaveChangesAsync();
}
}
public char?GetNextBlockChar(PredictionRequest predictionRequest, BlockGenerationMode mode)
{
string developer = GetDeveloperName(predictionRequest);
// MaxOccurrencesOfCharacterInBlock = 1 - random block generator.
// MaxOccurrencesOfCharacterInBlock > 1 - alternating tratments design.
const int MaxOccurrencesOfCharacterInBlock = 2;
using (var databaseContext = this.CreateContext())
{
var lastRbgData = GetLastRbgDatas(databaseContext, developer, MaxOccurrencesOfCharacterInBlock);
int experimentDay = CalculateCurrentExperimentDay(lastRbgData);
// Do nothing if we have RBG data for current experiment day.
if (lastRbgData.Any() && experimentDay == lastRbgData[0].ExperimentDay)
{
return(lastRbgData[0].Mode[0]);
}
// Calculate for new day.
char?nextCharacterInBlock = null;
if (mode == BlockGenerationMode.RandomBlockGenerator)
{
// [0] 2018-01-05 JOHN A
// [1] 2018-01-04 JOHN B
// [2] 2018-01-03 JOHN A
// [3] 2018-01-02 JOHN B
var block = lastRbgData
.Select(g => g.Mode[0])
.Reverse()
.ToArray();
var blockGenerator = RandomBlockGenerator.Create(new[] { 'A', 'B' });
blockGenerator.SetBlock(block);
// block = { 'B', 'A', 'B', 'A' }
nextCharacterInBlock = blockGenerator.Next(MaxOccurrencesOfCharacterInBlock);
}
else if (mode == BlockGenerationMode.ImposedParticipant)
{
Participant participant = GetParticipant(developer, databaseContext);
if (participant != null)
{
var generator = new ImposedBlockGenerator();
generator.SetBlock(participant.Block.ToList());
generator.SetPosition(experimentDay);
nextCharacterInBlock = generator.GetForIndex(generator.Position);
}
}
AppendRbgData(databaseContext, developer, experimentDay, nextCharacterInBlock);
return(nextCharacterInBlock);
}
}
private static string GetDeveloperName(PredictionRequest predictionRequest)
{
string developer = "Unknown";
foreach (PredictionRequestFile reqf in predictionRequest.Items)
{
developer = reqf.Author;
}
return(developer);
}
public async Task <PredictionRequest> Prepare(PredictionRequest predictionRequest)
{
if (predictionRequest?.Items == null)
{
return(predictionRequest);
}
var paths = predictionRequest.Items.Select(g => g.Path).ToList();
if (!paths.Any())
{
return(predictionRequest);
}
var oldPaths = predictionRequest.Items.Select(g => g.OldPath).ToList();
Dictionary <string, Metric> lastStats;
using (var context = new DatabaseContext(this.configuration.ExportDatabaseConnectionString))
{
var query = context.Metrics;
// Find last statistics for specified paths.
var subquery = query.Where(g => paths.Contains(g.Path) || oldPaths.Contains(g.Path))
.GroupBy(g => g.Path)
.Select(g => new
{
Path = g.Key,
LastStat = g.OrderByDescending(p => p.BuildCommitDateTimeLocal).Select(p => p).FirstOrDefault()
});
var result = await subquery.ToListAsync();
lastStats = result.ToDictionary(g => g.Path, g => g.LastStat);
}
foreach (var loopItem in predictionRequest.Items)
{
Metric stat;
if (lastStats.TryGetValue(loopItem.Path, out stat))
{
UpdatePrediction(loopItem, stat);
}
else if (lastStats.TryGetValue(loopItem.OldPath, out stat))
{
UpdatePrediction(loopItem, stat);
}
}
return(predictionRequest);
}
private PredictionResponse FilterResponseForParticipantMode(PredictionRequest request, PredictionResponse response)
{
var result = this.rbgService.GetNextBlockChar(request, BlockGenerationMode.ImposedParticipant);
if (result == 'B')
{
foreach (var prediction in response.Predictions)
{
prediction.SuccessProbability = null;
prediction.ProbableSuccess = null;
}
}
return(response);
}
// Experimental setup
private async Task <PredictionResponse> FilterResponseForExperiment(PredictionRequest request, PredictionResponse response)
{
if (!this.serviceConfiguration.ExperimentEnabled)
{
return(response);
}
switch (this.serviceConfiguration.ExperimentMode)
{
case ExperimentMode.Participant:
return(this.FilterResponseForParticipantMode(request, response));
case ExperimentMode.File:
return(await this.FilterResponseForFileMode(request, response));
}
return(response);
}
private async Task InsertFilePredictionForExperiment(PredictionRequest predictionRequest, string guid)
{
using (var databaseContext = this.CreateContext())
{
foreach (var item in predictionRequest.Items)
{
var filePrediction = await databaseContext.FilePredictions
.Where(file => file.FileName == item.Path)
.SingleOrDefaultAsync();
if (filePrediction == null)
{
var fileCache = databaseContext.FilePredictions.Create();
fileCache.FileName = item.Path;
fileCache.PredictionEnabled = this.rbgService.GetRandomPredictionEnabledFlag();
databaseContext.FilePredictions.Add(fileCache);
}
}
await databaseContext.SaveChangesAsync();
}
}
private async Task <PredictionResponse> GenerateResponse(PredictionRequest predictionRequest, string guid)
{
using (var databaseContext = this.CreateContext())
{
var cache = await databaseContext.PredictionRequests.Where(g => g.Guid == guid).ToListAsync();
var response = new PredictionResponse();
foreach (var requestItem in predictionRequest.Items)
{
var cachedItem = cache.FirstOrDefault(g => g.Path == requestItem.Path);
if (cachedItem == null)
{
throw new ApplicationException($"Cached item for path '{requestItem.Path}' not found");
}
var predictionResponseItem = new PredictionResponseItem();
predictionResponseItem.ProbableSuccess = cachedItem.BuildResultPredictionClass;
predictionResponseItem.SuccessProbability = 1 - cachedItem.BuildResultFaildPrediction;
response.Predictions.Add(predictionResponseItem);
}
return(response);
}
}