/// <summary>
/// Determine variation the user should be put in.
/// </summary>
/// <param name="config">ProjectConfig Configuration for the project</param>
/// <param name="experiment">Experiment Experiment in which user is to be bucketed</param>
/// <param name="bucketingId">A customer-assigned value used to create the key for the murmur hash.</param>
/// <param name="userId">User identifier</param>
/// <returns>Variation which will be shown to the user</returns>
public virtual Result <Variation> Bucket(ProjectConfig config, Experiment experiment, string bucketingId, string userId)
{
string message;
Variation variation;
var reasons = new DecisionReasons();
if (string.IsNullOrEmpty(experiment.Key))
{
return(Result <Variation> .NewResult(new Variation(), reasons));
}
// Determine if experiment is in a mutually exclusive group.
if (experiment.IsInMutexGroup)
{
Group group = config.GetGroup(experiment.GroupId);
if (string.IsNullOrEmpty(group.Id))
{
return(Result <Variation> .NewResult(new Variation(), reasons));
}
string userExperimentId = FindBucket(bucketingId, userId, group.Id, group.TrafficAllocation);
if (string.IsNullOrEmpty(userExperimentId))
{
message = $"User [{userId}] is in no experiment.";
Logger.Log(LogLevel.INFO, reasons.AddInfo(message));
return(Result <Variation> .NewResult(new Variation(), reasons));
}
if (userExperimentId != experiment.Id)
{
message = $"User [{userId}] is not in experiment [{experiment.Key}] of group [{experiment.GroupId}].";
Logger.Log(LogLevel.INFO, reasons.AddInfo(message));
return(Result <Variation> .NewResult(new Variation(), reasons));
}
message = $"User [{userId}] is in experiment [{experiment.Key}] of group [{experiment.GroupId}].";
Logger.Log(LogLevel.INFO, reasons.AddInfo(message));
}
// Bucket user if not in whitelist and in group (if any).
string variationId = FindBucket(bucketingId, userId, experiment.Id, experiment.TrafficAllocation);
if (string.IsNullOrEmpty(variationId))
{
Logger.Log(LogLevel.INFO, reasons.AddInfo($"User [{userId}] is in no variation."));
return(Result <Variation> .NewResult(new Variation(), reasons));
}
// success!
variation = config.GetVariationFromIdByExperimentId(experiment.Id, variationId);
message = $"User [{userId}] is in variation [{variation.Key}] of experiment [{experiment.Key}].";
Logger.Log(LogLevel.INFO, reasons.AddInfo(message));
return(Result <Variation> .NewResult(variation, reasons));
}