/// <summary>
/// Skip the question. Returns the next 2 questions like Answer but they aren't shown
/// asynchronously - make the user wait for skipping questions. Doesn't update the
/// answer cache.
/// </summary>
public async Task<JsonResult> Skip(AnswerViewModel input)
{
var profileId = GetMyProfileId();
var answer = new Answer
{
ProfileId = profileId,
QuestionId = (short)input.QuestionId,
ChoiceIndex = null,
ChoiceAccept = 0,
ChoiceWeight = 0,
};
await _quesRepo.AnswerAsync(answer);
var nextQuestions = _quesRepo.Next2Questions(profileId);
return Json(nextQuestions);
}
/// <summary>
/// Add/Updates a user's answer in the database, and then calls MatchApiClient to
/// update the cache. Responsible for keeping DB and cache in sync so wraps these
/// operations in a transaction.
///
/// - If getNextFlag = true get the next 2 questions and return them as JSON
/// - Otherwise return the user's validated answer
/// - Sets forceRecalculateMatches = true if user answered less than 10 questions (so new users can see results immediately)
///
/// More info about TransactionScope (limitations):
/// https://msdn.microsoft.com/en-us/data/dn456843.aspx
///
/// </summary>
public async Task<JsonResult> Answer(AnswerViewModel input, bool getNextFlag = true)
{
var profileId = GetMyProfileId();
_matchApiClient = GetMatchApiClient();
var answer = new Answer
{
ProfileId = profileId,
QuestionId = (short)input.QuestionId
};
//Convert checkboxes to bit array for Acceptable choices
byte acceptBits = 0;
foreach (var index in input.ChoiceAccept)
{
acceptBits |= (byte)(1 << (index - 1));
}
answer.ChoiceIndex = (byte)input.ChoiceIndex;
answer.ChoiceAccept = acceptBits;
answer.ChoiceWeight = (byte)input.ChoiceImportance;
//We should do some user input validation
if(!_quesRepo.ValidateAnswer(answer))
{
//invalid answer - return not OK
Response.StatusCode = (int)HttpStatusCode.BadRequest;
return Json(null);
}
// Isolation Level: Read Committed
// Timeout : 5 minutes
var options = new TransactionOptions
{
IsolationLevel = IsolationLevel.ReadCommitted,
Timeout = TimeSpan.FromMinutes(5)
};
int count;
//Update DB and Cache in a transaction
//By default if scope.Complete() isn't called the transaction is rolled back.
using (var scope = new TransactionScope(TransactionScopeOption.Required, options, TransactionScopeAsyncFlowOption.Enabled))
{
var t1 = _quesRepo.AnswerAsync(answer);
var t2 = _matchApiClient.AnswerAsync(answer);
//await Task.WhenAll(t1, t2);
await t1;
count = await t2;
scope.Complete();
}
//Update the Activity feed
if(IsOkToAddActivity(OkbConstants.ActivityCategories.AnsweredQuestion))
{
//Get the question text
var ques = _quesRepo.GetQuestion(input.QuestionId);
var choiceText = "";
choiceText = ques.Choices[((int)answer.ChoiceIndex - 1) % ques.Choices.Count];
_feedRepo.AnsweredQuestionActivity(profileId, ques.Text, choiceText);
UpdateActivityLastAdded(OkbConstants.ActivityCategories.AnsweredQuestion);
}
//set forceRecalculateMatches = true if answered less than 10 questions
if (count < 10)
{
Session[OkbConstants.FORCE_RECALCULATE_MATCHES] = true;
}
IList<QuestionModel> nextQuestions = null;
//Get the next questions
if (getNextFlag)
{
nextQuestions = _quesRepo.Next2Questions(profileId);
return Json(nextQuestions);
}
else
{
return Json(answer);
}
}