120 lines
4.2 KiB
Java
120 lines
4.2 KiB
Java
package com.ninjaws.quiz.services;
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import java.util.List;
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import java.util.Optional;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Service;
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import com.ninjaws.quiz.entities.QuestionEntity;
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import com.ninjaws.quiz.models.Answers;
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import com.ninjaws.quiz.models.QuizSettings;
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import com.ninjaws.quiz.models.Request;
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import com.ninjaws.quiz.models.Session;
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@Service
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public class QuizService {
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@Autowired
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private CacheService cacheService;
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@Autowired
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private QueueService queueService;
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@Autowired
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private DataService dataService;
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@Autowired
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private CleanerService cleanerService;
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/**
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* Actions:
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* - Creates a session with sessionId
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* - Adds session to the cache
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* - Creates a request and adds it to the queue
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* @param quizSettings The values set by the user, determining the kind of quiz they want
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* @return The sessionId
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*/
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public Optional<String> createSession(QuizSettings quizSettings) {
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Session session = new Session();
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/** First, we check if there are already enough items in our db */
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List<QuestionEntity> questionsRetrieved = dataService.lookupQuestions(quizSettings);
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if(!questionsRetrieved.isEmpty() && questionsRetrieved.size() == quizSettings.getAmount()) {
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session.setQuestions(cleanerService.questionListEntitytoDTO(questionsRetrieved));
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}
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cacheService.addToCache(session.getId(), session);
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/**
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* If the questions were retrieved from the DB, then it doesn't need to be added to the queue
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*/
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if(!questionsRetrieved.isEmpty() && questionsRetrieved.size() == quizSettings.getAmount()) {
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return Optional.of(session.getId());
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}
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boolean addedToQueue = queueService.addToQueue(new Request(session.getId(), quizSettings));
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/** In this order, because doing the queue before the cache could lead to race conditions (request completion immediately calls cache, but then the item doesn't exist) */
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if(!addedToQueue) {
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cacheService.removeFromCache(session.getId());
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return Optional.empty();
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}
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return Optional.of(session.getId());
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}
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/**
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* Actions:
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* - Looks up the session in the cache
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* - Checks if the data from the request is stored
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* @param sessionId
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* @return The data if it's available, Optional.empty() if not, and an Exception if the session is invalid
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*/
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public Optional<Session> checkSession(String sessionId) throws IllegalArgumentException {
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Session session = cacheService.getFromCache(sessionId);
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if(session == null) {
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throw new IllegalArgumentException("Invalid session ID: " + sessionId);
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}
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/** Still waiting for a response */
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if (session.getQuestions() == null) {
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return Optional.empty();
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}
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/** Anything other than statuscode 0 doesn't result in active sessions, so remove them from the cache after reporting to the frontend */
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// if(session.getStatusCode() != 0) {
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/** Regardless of status code, this link is not reusable */
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cacheService.removeFromCache(session.getId());
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// }
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return Optional.of(session);
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}
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/**
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* Receives: sessionId and answers
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*
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* Actions:
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* - retrieves session from cache
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* - Deletes session from cache
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* - Matches answers answers to correctAnswers
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* - Calculates score
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* Returns: calculated score
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* */
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public int getScore(Answers answers) {
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Session session = cacheService.getFromCache(answers.getSessionId());
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cacheService.removeFromCache(session.getId());
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return calculateScore(session, answers);
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}
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private int calculateScore(Session session, Answers answers) {
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int amountCorrect = 0;
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for(int i = 0; i < session.getQuestions().size(); i++) {
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String correctAnswer = session.getQuestions().get(i).getCorrectAnswer();
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String userAnswer = answers.getAnswers().get(i);
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if (correctAnswer.equalsIgnoreCase(userAnswer)) {
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amountCorrect++;
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}
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}
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return amountCorrect;
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}
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}
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