testmanagerbean.java

老外的在线考试

		{
			LocalTest test = m_testHome.findByPrimaryKey(id);
			test.setName( data.getName() );
			test.setOwnerHierarchyId( data.getOwnerHierId() );
			test.setPassPercentage(data.getPassPercentage());
			test.setMultiQuestionsMode( data.isMultiQuestionsMode());
			test.setSuppressQuestionFeedback(data.isSuppressQuestionFeedback());
			test.setSuppressTestEndFeedback(data.isSuppressTestEndFeedback());
			test.setTimeLimitSeconds( data.getTimeLimitSeconds());
			test.setLastModifiedMillis(System.currentTimeMillis());
			
			String[] resIdsToRemove = data.getResourceIdsToRemove();
			for (int r=0; r<resIdsToRemove.length; r++)
			{
				removeQuestionFromTest(id, resIdsToRemove[r]);
			}
			
			String[] resIdsToAdd = data.getResourceIdsToAdd();
			for (int r=0; r<resIdsToAdd.length; r++)
			{
				addQuestionToTest(id, resIdsToAdd[r]);
			}
		}
		catch (FinderException fex)
		{
			s_logger.log( Level.SEVERE, "Error finding Test ID="+id, fex);
			throw SchoolUtils.convertToEJBException(fex);
		}
		catch (Exception ex)
		{
			s_logger.log( Level.SEVERE, "Error setting data for Test ID="+id, ex);
			if (ex instanceof RuntimeException)
			{			
				throw (RuntimeException)ex;
			}
			throw new RuntimeException(ex);
		}
	}

	/**
	 * Checks the user's answer for a question. The user is
	 * awarded a score if the answer is correct. This method also
	 * creates an AnswerHistoryRecordBean instance to log this answer
	 * and the awarded score.
	 * 
	 * @param testId Test ID
	 * @param quesId Question ID
	 * @param userId User ID
	 * @param quesIndex Index of the question within the test.
	 * @param userAnswer User's answer as an index to the multiple answer choices.
	 * @param testSecs Amount of time in seconds the user took to complete the test (applicable only if multiQuestionsMode is enabled).
	 * @param quesSecs Amount of time in seconds the user took to answer this question (applicable only if multiQuestionsMode is disabled).
	 * @return The result status of the answer, one of the constants defined in IAnswerStatus.
	 * @throws EJBException if the test or question is missing, or some other error.
	 */
	public int checkQuestionAnswer(String testId, String quesId, String userId, 
		int quesIndex, Integer userAnswer, int testSecs, int quesSecs)
	{
		LocalTest test = null;
		try
		{
			test = m_testHome.findByPrimaryKey(testId);
		}
		catch (FinderException fex)
		{
			s_logger.log( Level.SEVERE, "Error finding Test ID="+testId, fex);
			throw SchoolUtils.convertToEJBException(fex);
		}
		
		int status = IAnswerStatus.WRONG;
		boolean exceedTestTime = false;
		boolean exceedQuesTime = false;
		int quesScore = 0;
		Integer quesAnswer = null;
		try
		{
			LocalQuestion ques = m_quesHome.findByPrimaryKey(quesId);
			if (ques.checkResponse(userAnswer))
			{
				status = IAnswerStatus.CORRECT;
			}
			quesScore = ques.getScore();
			quesAnswer = ques.getAnswer();
			if (test.isMultiQuestionsMode())
			{
				if (test.getTimeLimitSeconds()>0)
				{
					exceedTestTime = (testSecs > test.getTimeLimitSeconds());
					status = exceedTestTime ? IAnswerStatus.TEST_TIMED_OUT : status;
				}
			}
			else
			{
				if (ques.getTimeLimitSeconds()>0)
				{
					exceedQuesTime = (quesSecs > ques.getTimeLimitSeconds());
					status = exceedQuesTime ? IAnswerStatus.QUESTION_TIMED_OUT : status;
				}
			}
		}
		catch (FinderException fex)
		{
			s_logger.log( Level.SEVERE, "Error finding Question ID="+quesId, fex);
			throw SchoolUtils.convertToEJBException(fex);
		}
		
		int scoreToAdd = (status == IAnswerStatus.CORRECT) ? quesScore : 0;			
		
		try
		{
			s_logger.fine("Adding score "+scoreToAdd+" for test "+testId+", question "+quesId+" to user "+userId);
			LocalUserTestAssoc assoc = findTestUserAssoc(testId, userId);
			if (assoc==null)
			{
				assoc = m_userTestAssocHome.create(testId, userId);
			}
			assoc.addScore(scoreToAdd, quesScore);
			if (exceedTestTime)
			{
				assoc.exceededTestTime();
			}
		}
		catch (CreateException cex)
		{
			s_logger.log( Level.SEVERE, "Error creating Score for Test ID="+testId+", User ID="+userId, cex);
			throw SchoolUtils.convertToEJBException(cex);
		}
		catch (RuntimeException ex)
		{
			s_logger.log( Level.SEVERE, "Error adding score for Test ID="+testId+", User ID="+userId, ex);			
			throw ex;
		}
		
		try
		{
			m_answerHistoryRecordHome.create(testId, quesId, userId, quesIndex, quesScore, scoreToAdd, userAnswer.intValue(), quesAnswer.intValue(), exceedQuesTime);			
		}
		catch (CreateException cex)
		{
			s_logger.log( Level.SEVERE, "Error creating history record for Test ID="+testId+", Question ID="+quesId+", User ID="+userId, cex);
			throw SchoolUtils.convertToEJBException(cex);
		}
		catch (RuntimeException ex)
		{
			s_logger.log( Level.SEVERE, "Error creating history record for Test ID="+testId+", Question ID="+quesId+", User ID="+userId, ex);			
			throw ex;
		}
		return status;
	}

	/**
	 * Gets the test score data for a user. Optionally consider the test's suppressTestEndFeedback 
	 * setting to hide the score when appropriate. If the score is hidden, this method returns null.
	 * @param testId Test ID
	 * @param userId User ID
	 * @param applySuppressResults true to consider the test's suppressTestEndFeedback setting, false to ignore it.
	 * @return ScoreData instance storing score information, null if the user has not taken the test yet or if it has been suppressed by the test's suppressTestEndFeedback setting.
	 * @throws EJBException if the test is missing.
	 */
	public ScoreData getTestScoreForUser(String testId, String userId, boolean applySuppressResults )
	{
		LocalUserTestAssoc assoc = findTestUserAssoc(testId, userId);
		if (assoc==null)
		{
			return null;		
		}
		LocalTest test = null;
		try
		{
			test = m_testHome.findByPrimaryKey(testId);
		}
		catch (FinderException fex)
		{
			s_logger.log( Level.SEVERE, "Error finding Test ID="+testId, fex);
			throw SchoolUtils.convertToEJBException(fex);
		}

		if (test==null)
		{
			return null;
		}

		if (applySuppressResults && test.isSuppressTestEndFeedback() )
		{
			return null;
		}

		int score = assoc.getScore();
		int maxScore = assoc.getMaxScore();
		boolean passed =  (maxScore>0) ? ( ((score*100)/maxScore) >= test.getPassPercentage() ) : false;

		return new ScoreData( assoc.getUserId(), assoc.getTestId(), test.getName(),
			score, maxScore, passed , assoc.isExceededTestTime() , assoc.getLastModifiedDateTime() );
	}
	
	public void addTestToUser( String testId, String userId)
	{
		s_logger.fine("Adding test "+testId+" to user "+userId);
		try
		{
			m_userTestAssocHome.create(testId, userId);	
		}
		catch (CreateException ex)
		{
			s_logger.warning( "Failed to create LocalUserTestAssoc with Test ID="+testId+", User ID="+userId);
			throw SchoolUtils.convertToEJBException(ex);
		}
	}

	/**
	 * Removes a test from a user.
	 * @param testId Test ID
	 * @param userId User ID
	 * @throws EJBException if the test is missing or some other error.
	 */
	public void removeTestFromUser( String testId, String userId)
	{
		s_logger.fine("Removing test "+testId+" from user "+userId);
		UserTestAssocKey key = new UserTestAssocKey();
		key.testId = testId;
		key.userId = userId;
		try
		{
			LocalUserTestAssoc assoc = m_userTestAssocHome.findByPrimaryKey( key );
			assoc.remove(); 	
		}
		catch (Exception ex)
		{
			s_logger.warning( "Failed to remove LocalUserTestAssoc for Test ID="+testId+", User ID="+userId);
			throw SchoolUtils.convertToEJBException(ex);
		}
	}
	
	/**
	 * Gets a user's historical records for a test and user.
	 * @param testId Test ID
	 * @param userId User ID
	 * @return List of AnswerHistoryData instances.
	 */
	public List getAnswerHistory(String testId, String userId)
	{
		s_logger.fine("Getting answer history for test "+testId+", user "+userId);
		LinkedList historyList = new LinkedList();
		try
		{
			Collection historyCol = m_answerHistoryRecordHome.findByUserAndTest(userId,testId);
			Iterator hIter=historyCol.iterator();
			while (hIter.hasNext())
			{
				LocalAnswerHistoryRecord record = (LocalAnswerHistoryRecord)hIter.next();
				historyList.add( new AnswerHistoryData (
					record.getTestId(), record.getQuestionId(), record.getUserId(),
					record.getQuestionIndex(), record.getQuestionScore(),
					record.getUserAnswer(), record.getCorrectAnswer(),
					record.isAnswerCorrect(), record.getTimestamp()) 
				);
			}
		}
		catch (FinderException fex)
		{
			s_logger.log( Level.SEVERE, "Error getting answer history for test "+testId+", user "+userId, fex);
			throw SchoolUtils.convertToEJBException(fex);
		}
		catch (RuntimeException ex)
		{
			s_logger.log( Level.SEVERE, "Error getting answer history for test "+testId+", user "+userId, ex);			
			throw ex;
		}

		return historyList;
	}


	private boolean canDeactivateTest(LocalTest test)
	{
		if (!test.isActive())
		{
			return false;
		}
		
		boolean hasAssoc = false;
		try
		{
			hasAssoc = !(m_userTestAssocHome.findByTest(test.getId()).isEmpty());
		}
		catch (FinderException fex)
		{
			// Ignore exception;
		}
		
		return !hasAssoc;
	}
	
	
	private LocalUserTestAssoc findTestUserAssoc(String testId, String userId)
	{
		LocalUserTestAssoc assoc = null;
		try
		{
			Iterator scoreIter = m_userTestAssocHome.findByUserAndTest(userId, testId.toString()).iterator();
			if (scoreIter.hasNext())
			{
				assoc = (LocalUserTestAssoc)scoreIter.next();
			}
		}
		catch (Exception ex)
		{
			s_logger.log( Level.FINE, "LocalUserTestAssoc does not exist yet for Test ID="+testId+", User ID="+userId);
		}
		return assoc;
	}
	
	private TestData getDataFromTest(LocalTest test) throws FinderException
	{
		TestData data = new TestData(test.getId(), test.getName(), test.getOwner(),
			test.getOwnerHierarchyId(), test.getPassPercentage(), 
			test.getTimeLimitSeconds(), test.isMultiQuestionsMode(),
			test.isSuppressQuestionFeedback(), test.isSuppressTestEndFeedback(),
			canDeactivateTest(test));
		List relatedQuesList = new ArrayList(m_quesHome.findByTest(test.getId()));
		List unrelatedQuesList = new ArrayList(m_quesHome.findByTest(""));

		ResourceListData[] relatedQuesDataArr = new ResourceListData[ relatedQuesList.size() ];
		for (int ridx=0; ridx<relatedQuesDataArr.length; ridx++)
		{
			LocalQuestion ques = (LocalQuestion)relatedQuesList.get(ridx);
			relatedQuesDataArr[ridx] = new ResourceListData(ques.getId(), ques.getName());
		}

		ResourceListData[] unrelatedQuesDataArr = new ResourceListData[ unrelatedQuesList.size() ];
		for (int uidx=0; uidx<unrelatedQuesDataArr.length; uidx++)
		{
			LocalQuestion ques = (LocalQuestion)unrelatedQuesList.get(uidx);
			unrelatedQuesDataArr[uidx] = new ResourceListData(ques.getId(), ques.getName());
		}

		data.setRelatedResources( relatedQuesDataArr );
		data.setUnrelatedResources( unrelatedQuesDataArr );
		return data;
	}

	//-----------------------------
	// Container methods.
	//-----------------------------

	public void ejbCreate() {}
	public void ejbPostCreate() { }
	public void ejbRemove() {}
	public void ejbActivate() {}
	public void ejbPassivate() {}
	
	public void setSessionContext(SessionContext sc) 
	{
		m_context = sc;
	}

	private SessionContext m_context = null;
	private LocalTestHome m_testHome = null;
	private LocalQuestionHome m_quesHome = null;
	private LocalUserTestAssocHome m_userTestAssocHome = null;
	private LocalAnswerHistoryRecordHome m_answerHistoryRecordHome = null;

	private static Logger s_logger = Logger.getLogger( TestManagerBean.class.getName());
	
}