Added Project

2024-11-06 22:13:00 +01:00
commit 10c4aa8831
107 changed files with 18082 additions and 0 deletions
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+package com.ninjaws.quiz.services;
+
+import java.util.List;
+import java.util.Optional;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import com.ninjaws.quiz.entities.QuestionEntity;
+import com.ninjaws.quiz.models.Answers;
+import com.ninjaws.quiz.models.QuizSettings;
+import com.ninjaws.quiz.models.Request;
+import com.ninjaws.quiz.models.Session;
+
+
+@Service
+public class QuizService {
+
+    @Autowired
+    private CacheService cacheService;
+    @Autowired
+    private QueueService queueService;
+    @Autowired
+    private DataService dataService;
+    @Autowired
+    private CleanerService cleanerService;
+    @Autowired
+    private StateManagementService stateManager;
+
+    /**
+     * Actions:
+     * - Creates a session with sessionId
+     * - Adds session to the cache
+     * - Creates a request and adds it to the queue
+     * @param quizSettings The values set by the user, determining the kind of quiz they want
+     * @return The sessionId
+     */
+    public Optional<String> createSession(QuizSettings quizSettings) {
+        Session session = new Session();
+
+        /** First, we check if there are already enough items in our db */
+        List<QuestionEntity> questionsRetrieved = dataService.lookupQuestions(quizSettings);
+        /** If the items are not matching the required amount, and the db is not currently being filled up, then they simply don't exist */
+        if (questionsRetrieved.size() < quizSettings.getAmount() && stateManager.getCurrentProcessingState() != StateManagementService.ProcessingState.STARTUP) {
+            session.setStatusCode(1);
+            cacheService.addToCache(session.getId(), session);
+            return Optional.of(session.getId());
+        }
+        /** All items are collected in from the database, it doesn't need to be added to the queue */
+        if(!questionsRetrieved.isEmpty() && questionsRetrieved.size() == quizSettings.getAmount()) {
+            session.setQuestions(cleanerService.questionListEntitytoDTO(questionsRetrieved));
+            cacheService.addToCache(session.getId(), session);
+            return Optional.of(session.getId());
+        }
+
+        cacheService.addToCache(session.getId(), session);
+        boolean addedToQueue = queueService.addToQueue(new Request(session.getId(), quizSettings));
+        /** 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) */
+        if(!addedToQueue) {
+            cacheService.removeFromCache(session.getId());
+            return Optional.empty();
+        }
+
+        return Optional.of(session.getId());
+    }
+
+    /**
+     * Actions:
+     * - Looks up the session in the cache
+     * - Checks if the data from the request is stored
+     * @param sessionId
+     * @return The data if it's available, Optional.empty() if not, and an Exception if the session is invalid
+     */
+    public Optional<Session> checkSession(String sessionId) throws IllegalArgumentException {
+        Session session = cacheService.getFromCache(sessionId);
+
+        if(session == null) {
+            throw new IllegalArgumentException("Invalid session ID: " + sessionId);
+        }
+
+        /** Anything other than statuscode 0 doesn't result in active sessions, so remove them from the cache after reporting to the frontend */
+        if(session.getStatusCode() != 0) {
+            cacheService.removeFromCache(session.getId());
+            return Optional.of(session);
+        }
+
+        /** Still waiting for a response */
+        if (session.getQuestions() == null) {
+            return Optional.empty();
+        }
+
+
+        return Optional.of(session);
+    }
+
+    /**
+     * Receives: sessionId and answers
+     * 
+     * Actions: 
+     * - Retrieves session from cache
+     * - Deletes session from cache
+     * - Matches answers answers to correctAnswers
+     * - Calculates score
+     * Returns: calculated score
+     *  */
+    public int getScore(Answers answers) {
+        Session session = cacheService.getFromCache(answers.getSessionId());
+        cacheService.removeFromCache(session.getId());
+        return calculateScore(session, answers);
+    }
+
+    private int calculateScore(Session session, Answers answers) {
+        int amountCorrect = 0;
+        for(int i = 0; i < session.getQuestions().size(); i++) {
+            String correctAnswer = session.getQuestions().get(i).getCorrectAnswer();
+            String userAnswer = answers.getAnswers().get(i);
+            if (correctAnswer.equalsIgnoreCase(userAnswer)) {
+                amountCorrect++;
+            }
+        }
+        return amountCorrect;
+    }    
+}