From 2d947098442d5d8337d196a476bc8ac0ce1abbf6 Mon Sep 17 00:00:00 2001
From: Daniel Gerhardt <code@dgerhardt.net>
Date: Mon, 28 Aug 2017 16:40:41 +0200
Subject: [PATCH] Rename caches
* skillquestions -> contentlists
* lecturequestions -> lecturecontentlists
* preparationquestions -> preparationcontentlists
* flashcardquestions -> flashcardcontentlists
* questions -> contents
* answers -> answerlists
* learningprogress -> score
---
.../de/thm/arsnova/cache/CacheBusterImpl.java | 2 +-
.../arsnova/cache/ScheduledCacheBuster.java | 14 +--
.../arsnova/services/ContentServiceImpl.java | 90 +++++++++----------
.../score/ScoreCalculatorFactoryImpl.java | 26 +++---
.../score/VariantScoreCalculator.java | 2 +-
src/site/markdown/development/caching.md | 18 ++--
6 files changed, 76 insertions(+), 76 deletions(-)
diff --git a/src/main/java/de/thm/arsnova/cache/CacheBusterImpl.java b/src/main/java/de/thm/arsnova/cache/CacheBusterImpl.java
index ac29ca5f8..639c3474a 100644
--- a/src/main/java/de/thm/arsnova/cache/CacheBusterImpl.java
+++ b/src/main/java/de/thm/arsnova/cache/CacheBusterImpl.java
@@ -51,7 +51,7 @@ public class CacheBusterImpl implements CacheBuster, ArsnovaEventVisitor {
@Override
public void visit(LockQuestionsEvent lockQuestionsEvent) { }
- @CacheEvict(value = "answers", key = "#event.content.id")
+ @CacheEvict(value = "answerlists", key = "#event.content.id")
@Override
public void visit(NewAnswerEvent event) { }
diff --git a/src/main/java/de/thm/arsnova/cache/ScheduledCacheBuster.java b/src/main/java/de/thm/arsnova/cache/ScheduledCacheBuster.java
index 3a093d978..7a611a105 100644
--- a/src/main/java/de/thm/arsnova/cache/ScheduledCacheBuster.java
+++ b/src/main/java/de/thm/arsnova/cache/ScheduledCacheBuster.java
@@ -38,31 +38,31 @@ public class ScheduledCacheBuster {
@Scheduled(initialDelay = 1000 * 25, fixedRate = 1000 * 60 * 60 * 6)
private void clearSessionCache() { }
- @CacheEvict(value = "questions", allEntries = true)
+ @CacheEvict(value = "contents", allEntries = true)
@Scheduled(initialDelay = 1000 * 50, fixedRate = 1000 * 60 * 30)
private void clearQuestionCache() { }
- @CacheEvict(value = "skillquestions", allEntries = true)
+ @CacheEvict(value = "contentlists", allEntries = true)
@Scheduled(initialDelay = 1000 * 75, fixedRate = 1000 * 60 * 30)
private void clearSkillQuestionCache() { }
- @CacheEvict(value = "lecturequestions", allEntries = true)
+ @CacheEvict(value = "lecturecontentlists", allEntries = true)
@Scheduled(initialDelay = 1000 * 100, fixedRate = 1000 * 60 * 30)
private void clearLectureQuestionCache() { }
- @CacheEvict(value = "preparationquestions", allEntries = true)
+ @CacheEvict(value = "preparationcontentlists", allEntries = true)
@Scheduled(initialDelay = 1000 * 125, fixedRate = 1000 * 60 * 30)
private void clearPreparationQuestionCache() { }
- @CacheEvict(value = "flashcardquestions", allEntries = true)
+ @CacheEvict(value = "flashcardcontentlists", allEntries = true)
@Scheduled(initialDelay = 1000 * 150, fixedRate = 1000 * 60 * 30)
private void clearFlashcardQuestionCache() { }
- @CacheEvict(value = "answers", allEntries = true)
+ @CacheEvict(value = "answerlists", allEntries = true)
@Scheduled(initialDelay = 1000 * 175, fixedRate = 1000 * 60 * 15)
private void clearAnswerCache() { }
- @CacheEvict(value = "learningprogress", allEntries = true)
+ @CacheEvict(value = "score", allEntries = true)
@Scheduled(initialDelay = 1000 * 200, fixedRate = 1000 * 60 * 15)
private void clearLearningProgressCache() { }
diff --git a/src/main/java/de/thm/arsnova/services/ContentServiceImpl.java b/src/main/java/de/thm/arsnova/services/ContentServiceImpl.java
index 8f3c6715b..167b31863 100644
--- a/src/main/java/de/thm/arsnova/services/ContentServiceImpl.java
+++ b/src/main/java/de/thm/arsnova/services/ContentServiceImpl.java
@@ -131,7 +131,7 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
}
}
- @Cacheable("questions")
+ @Cacheable("contents")
@Override
public Content get(final String id) {
try {
@@ -152,11 +152,11 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
}
@Override
- @Caching(evict = {@CacheEvict(value = "skillquestions", key = "#sessionId"),
- @CacheEvict(value = "lecturequestions", key = "#sessionId", condition = "#content.getQuestionVariant().equals('lecture')"),
- @CacheEvict(value = "preparationquestions", key = "#sessionId", condition = "#content.getQuestionVariant().equals('preparation')"),
- @CacheEvict(value = "flashcardquestions", key = "#sessionId", condition = "#content.getQuestionVariant().equals('flashcard')") },
- put = {@CachePut(value = "questions", key = "#content.id")})
+ @Caching(evict = {@CacheEvict(value = "contentlists", key = "#sessionId"),
+ @CacheEvict(value = "lecturecontentlists", key = "#sessionId", condition = "#content.getQuestionVariant().equals('lecture')"),
+ @CacheEvict(value = "preparationcontentlists", key = "#sessionId", condition = "#content.getQuestionVariant().equals('preparation')"),
+ @CacheEvict(value = "flashcardcontentlists", key = "#sessionId", condition = "#content.getQuestionVariant().equals('flashcard')") },
+ put = {@CachePut(value = "contents", key = "#content.id")})
public Content save(final String sessionId, final Content content) {
content.setSessionId(sessionId);
try {
@@ -173,11 +173,11 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
@Override
@PreAuthorize("isAuthenticated()")
@Caching(evict = {
- @CacheEvict(value = "skillquestions", allEntries = true),
- @CacheEvict(value = "lecturequestions", allEntries = true, condition = "#content.getQuestionVariant().equals('lecture')"),
- @CacheEvict(value = "preparationquestions", allEntries = true, condition = "#content.getQuestionVariant().equals('preparation')"),
- @CacheEvict(value = "flashcardquestions", allEntries = true, condition = "#content.getQuestionVariant().equals('flashcard')") },
- put = {@CachePut(value = "questions", key = "#content.id")})
+ @CacheEvict(value = "contentlists", allEntries = true),
+ @CacheEvict(value = "lecturecontentlists", allEntries = true, condition = "#content.getQuestionVariant().equals('lecture')"),
+ @CacheEvict(value = "preparationcontentlists", allEntries = true, condition = "#content.getQuestionVariant().equals('preparation')"),
+ @CacheEvict(value = "flashcardcontentlists", allEntries = true, condition = "#content.getQuestionVariant().equals('flashcard')") },
+ put = {@CachePut(value = "contents", key = "#content.id")})
public Content update(final Content content) {
final User user = userService.getCurrentUser();
final Content oldContent = contentRepository.findOne(content.getId());
@@ -214,7 +214,7 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
/* FIXME: caching */
@Override
@PreAuthorize("isAuthenticated()")
- //@Cacheable("skillquestions")
+ //@Cacheable("contentlists")
public List<Content> getBySessionKey(final String sessionkey) {
final Session session = getSession(sessionkey);
final User user = userService.getCurrentUser();
@@ -268,12 +268,12 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
@Override
@PreAuthorize("hasPermission(#contentId, 'content', 'owner')")
@Caching(evict = {
- @CacheEvict("answers"),
- @CacheEvict(value = "questions", key = "#contentId"),
- @CacheEvict(value = "skillquestions", allEntries = true),
- @CacheEvict(value = "lecturequestions", allEntries = true /*, condition = "#content.getQuestionVariant().equals('lecture')"*/),
- @CacheEvict(value = "preparationquestions", allEntries = true /*, condition = "#content.getQuestionVariant().equals('preparation')"*/),
- @CacheEvict(value = "flashcardquestions", allEntries = true /*, condition = "#content.getQuestionVariant().equals('flashcard')"*/) })
+ @CacheEvict("answerlists"),
+ @CacheEvict(value = "contents", key = "#contentId"),
+ @CacheEvict(value = "contentlists", allEntries = true),
+ @CacheEvict(value = "lecturecontentlists", allEntries = true /*, condition = "#content.getQuestionVariant().equals('lecture')"*/),
+ @CacheEvict(value = "preparationcontentlists", allEntries = true /*, condition = "#content.getQuestionVariant().equals('preparation')"*/),
+ @CacheEvict(value = "flashcardcontentlists", allEntries = true /*, condition = "#content.getQuestionVariant().equals('flashcard')"*/) })
public void delete(final String contentId) {
final Content content = contentRepository.findOne(contentId);
if (content == null) {
@@ -299,11 +299,11 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
@PreAuthorize("hasPermission(#session, 'owner')")
@Caching(evict = {
- @CacheEvict(value = "questions", allEntries = true),
- @CacheEvict(value = "skillquestions", key = "#session.getId()"),
- @CacheEvict(value = "lecturequestions", key = "#session.getId()", condition = "'lecture'.equals(#variant)"),
- @CacheEvict(value = "preparationquestions", key = "#session.getId()", condition = "'preparation'.equals(#variant)"),
- @CacheEvict(value = "flashcardquestions", key = "#session.getId()", condition = "'flashcard'.equals(#variant)") })
+ @CacheEvict(value = "contents", allEntries = true),
+ @CacheEvict(value = "contentlists", key = "#session.getId()"),
+ @CacheEvict(value = "lecturecontentlists", key = "#session.getId()", condition = "'lecture'.equals(#variant)"),
+ @CacheEvict(value = "preparationcontentlists", key = "#session.getId()", condition = "'preparation'.equals(#variant)"),
+ @CacheEvict(value = "flashcardcontentlists", key = "#session.getId()", condition = "'flashcard'.equals(#variant)") })
private void deleteBySessionAndVariant(final Session session, final String variant) {
final List<String> contentIds;
if ("all".equals(variant)) {
@@ -427,7 +427,7 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
@Override
@PreAuthorize("hasPermission(#questionId, 'content', 'owner')")
- @CacheEvict("answers")
+ @CacheEvict("answerlists")
public void resetPiRoundState(final String questionId) {
final Content content = contentRepository.findOne(questionId);
final Session session = sessionRepository.findOne(content.getSessionId());
@@ -470,10 +470,10 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
@Override
@PreAuthorize("isAuthenticated()")
@Caching(evict = { @CacheEvict(value = "contents", allEntries = true),
- @CacheEvict(value = "skillquestions", key = "#sessionId"),
- @CacheEvict(value = "lecturequestions", key = "#sessionId"),
- @CacheEvict(value = "preparationquestions", key = "#sessionId"),
- @CacheEvict(value = "flashcardquestions", key = "#sessionId") })
+ @CacheEvict(value = "contentlists", key = "#sessionId"),
+ @CacheEvict(value = "lecturecontentlists", key = "#sessionId"),
+ @CacheEvict(value = "preparationcontentlists", key = "#sessionId"),
+ @CacheEvict(value = "flashcardcontentlists", key = "#sessionId") })
public void setVotingAdmissions(final String sessionkey, final boolean disableVoting, List<Content> contents) {
final User user = getCurrentUser();
final Session session = getSession(sessionkey);
@@ -711,7 +711,7 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
@Override
@PreAuthorize("isAuthenticated()")
- @CacheEvict(value = "answers", key = "#contentId")
+ @CacheEvict(value = "answerlists", key = "#contentId")
public Answer saveAnswer(final String contentId, final Answer answer) {
final User user = getCurrentUser();
final Content content = get(contentId);
@@ -750,7 +750,7 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
@Override
@PreAuthorize("isAuthenticated()")
- @CacheEvict(value = "answers", allEntries = true)
+ @CacheEvict(value = "answerlists", allEntries = true)
public Answer updateAnswer(final Answer answer) {
final User user = userService.getCurrentUser();
final Answer realAnswer = this.getMyAnswer(answer.getQuestionId());
@@ -775,7 +775,7 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
@Override
@PreAuthorize("isAuthenticated()")
- @CacheEvict(value = "answers", allEntries = true)
+ @CacheEvict(value = "answerlists", allEntries = true)
public void deleteAnswer(final String questionId, final String answerId) {
final Content content = contentRepository.findOne(questionId);
if (content == null) {
@@ -794,7 +794,7 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
/* FIXME: caching */
@Override
@PreAuthorize("isAuthenticated()")
- //@Cacheable("lecturequestions")
+ //@Cacheable("lecturecontentlists")
public List<Content> getLectureQuestions(final String sessionkey) {
final Session session = getSession(sessionkey);
final User user = userService.getCurrentUser();
@@ -808,7 +808,7 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
/* FIXME: caching */
@Override
@PreAuthorize("isAuthenticated()")
- //@Cacheable("flashcardquestions")
+ //@Cacheable("flashcardcontentlists")
public List<Content> getFlashcards(final String sessionkey) {
final Session session = getSession(sessionkey);
final User user = userService.getCurrentUser();
@@ -822,7 +822,7 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
/* FIXME: caching */
@Override
@PreAuthorize("isAuthenticated()")
- //@Cacheable("preparationquestions")
+ //@Cacheable("preparationcontentlists")
public List<Content> getPreparationQuestions(final String sessionkey) {
final Session session = getSession(sessionkey);
final User user = userService.getCurrentUser();
@@ -968,10 +968,10 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
@Override
@PreAuthorize("isAuthenticated()")
@Caching(evict = { @CacheEvict(value = "contents", allEntries = true),
- @CacheEvict(value = "skillquestions", key = "#sessionId"),
- @CacheEvict(value = "lecturequestions", key = "#sessionId"),
- @CacheEvict(value = "preparationquestions", key = "#sessionId"),
- @CacheEvict(value = "flashcardquestions", key = "#sessionId") })
+ @CacheEvict(value = "contentlists", key = "#sessionId"),
+ @CacheEvict(value = "lecturecontentlists", key = "#sessionId"),
+ @CacheEvict(value = "preparationcontentlists", key = "#sessionId"),
+ @CacheEvict(value = "flashcardcontentlists", key = "#sessionId") })
public void publishQuestions(final String sessionkey, final boolean publish, List<Content> contents) {
final User user = getCurrentUser();
final Session session = getSession(sessionkey);
@@ -993,7 +993,7 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
@Override
@PreAuthorize("isAuthenticated()")
- @CacheEvict(value = "answers", allEntries = true)
+ @CacheEvict(value = "answerlists", allEntries = true)
public void deleteAllQuestionsAnswers(final String sessionkey) {
final User user = getCurrentUser();
final Session session = getSession(sessionkey);
@@ -1012,7 +1012,7 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
/* TODO: Only evict cache entry for the answer's question. This requires some refactoring. */
@Override
@PreAuthorize("hasPermission(#sessionkey, 'session', 'owner')")
- @CacheEvict(value = "answers", allEntries = true)
+ @CacheEvict(value = "answerlists", allEntries = true)
public void deleteAllPreparationAnswers(String sessionkey) {
final Session session = getSession(sessionkey);
@@ -1027,7 +1027,7 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
/* TODO: Only evict cache entry for the answer's question. This requires some refactoring. */
@Override
@PreAuthorize("hasPermission(#sessionkey, 'session', 'owner')")
- @CacheEvict(value = "answers", allEntries = true)
+ @CacheEvict(value = "answerlists", allEntries = true)
public void deleteAllLectureAnswers(String sessionkey) {
final Session session = getSession(sessionkey);
@@ -1041,10 +1041,10 @@ public class ContentServiceImpl extends EntityService<Content> implements Conten
@Caching(evict = {
@CacheEvict(value = "contents", allEntries = true),
- @CacheEvict(value = "skillquestions", key = "#sessionId"),
- @CacheEvict(value = "lecturequestions", key = "#sessionId"),
- @CacheEvict(value = "preparationquestions", key = "#sessionId"),
- @CacheEvict(value = "flashcardquestions", key = "#sessionId") })
+ @CacheEvict(value = "contentlists", key = "#sessionId"),
+ @CacheEvict(value = "lecturecontentlists", key = "#sessionId"),
+ @CacheEvict(value = "preparationcontentlists", key = "#sessionId"),
+ @CacheEvict(value = "flashcardcontentlists", key = "#sessionId") })
private void resetContentsRoundState(final String sessionId, final List<Content> contents) {
for (final Content q : contents) {
/* TODO: Check if setting the sessionId is necessary. */
diff --git a/src/main/java/de/thm/arsnova/services/score/ScoreCalculatorFactoryImpl.java b/src/main/java/de/thm/arsnova/services/score/ScoreCalculatorFactoryImpl.java
index c6214cd66..c68c2a176 100644
--- a/src/main/java/de/thm/arsnova/services/score/ScoreCalculatorFactoryImpl.java
+++ b/src/main/java/de/thm/arsnova/services/score/ScoreCalculatorFactoryImpl.java
@@ -56,79 +56,79 @@ public class ScoreCalculatorFactoryImpl implements ArsnovaEventVisitor, ScoreCal
@Override
public void visit(DeleteCommentEvent deleteCommentEvent) { }
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(NewQuestionEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
}
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(UnlockQuestionEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
}
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(UnlockQuestionsEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
}
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(LockQuestionEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
}
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(LockQuestionsEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
}
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(NewAnswerEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
}
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(DeleteAnswerEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
}
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(DeleteQuestionEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
}
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(DeleteAllQuestionsEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
}
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(DeleteAllQuestionsAnswersEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
}
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(DeleteAllPreparationAnswersEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
}
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(DeleteAllLectureAnswersEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
}
- @CacheEvict(value = "learningprogress", key = "#event.Session")
+ @CacheEvict(value = "score", key = "#event.Session")
@Override
public void visit(PiRoundResetEvent event) {
this.publisher.publishEvent(new ChangeScoreEvent(this, event.getSession()));
diff --git a/src/main/java/de/thm/arsnova/services/score/VariantScoreCalculator.java b/src/main/java/de/thm/arsnova/services/score/VariantScoreCalculator.java
index 269b173c2..003125a0e 100644
--- a/src/main/java/de/thm/arsnova/services/score/VariantScoreCalculator.java
+++ b/src/main/java/de/thm/arsnova/services/score/VariantScoreCalculator.java
@@ -38,7 +38,7 @@ abstract class VariantScoreCalculator implements ScoreCalculator {
this.sessionStatisticsRepository = sessionStatisticsRepository;
}
- @Cacheable("learningprogress")
+ @Cacheable("score")
private Score loadProgress(final Session session) {
return sessionStatisticsRepository.getLearningProgress(session);
}
diff --git a/src/site/markdown/development/caching.md b/src/site/markdown/development/caching.md
index 76ed0623a..ec8baaf7a 100644
--- a/src/site/markdown/development/caching.md
+++ b/src/site/markdown/development/caching.md
@@ -19,7 +19,7 @@ Caching should only be used with domain objects, where the `hashCode` and `equal
public ResultObject notVeryCacheable(String sessionId, String questionVariant, String subject) { ... }
```
-Therefore, you should always work with domain objects like `Session`, `Question`, or even your own, newly defined objects:
+Therefore, you should always work with domain objects like `Session`, `Content`, or even your own, newly defined objects:
```java
@Cacheable("verycacheable")
@@ -46,14 +46,14 @@ Here is a list of all caches, their keys, and a short description.
Cache name | Key | Description
-----------|-----|------------
-`skillquestions`| database id of session | Contains all questions for the specified session irrespective of their variant.
-`lecturequestions` | database id of session | Contains all "lecture" variant questions for the specified session.
-`preparationquestions` | database id of session | Contains all "preparation" variant questions for the specified session.
-`flashcardquestions` | database id of session | Contains all "flashcard" variant questions for the specified session.
-`questions` | `Question` entity | Contains single question objects.
-`questions` | database id of question | Although it shares the name of the previously mentioned cache, it is in essence a different cache because the keys are different. This means that the same `Question` object might be associated with two different keys.
-`answers`| database id of question | Contains single answer objects.
-`learningprogress` | `Session` entity | Contains `CourseScore` objects to calculate the learning progress values for the specified session.
+`contentlists`| database id of session | Contains all contents for the specified session irrespective of their variant.
+`lecturecontentlists` | database id of session | Contains all "lecture" variant contents for the specified session.
+`preparationcontentlists` | database id of session | Contains all "preparation" variant contents for the specified session.
+`flashcardcontentlists` | database id of session | Contains all "flashcard" variant contents for the specified session.
+`contents` | `Content` entity | Contains single content objects.
+`contents` | database id of content | Although it shares the name of the previously mentioned cache, it is in essence a different cache because the keys are different. This means that the same `Content` object might be associated with two different keys.
+`answerlists`| database id of content | Contains single answer objects.
+`score` | `Session` entity | Contains `CourseScore` objects to calculate the score values for the specified session.
`sessions` | keyword of session | Contains sessions identified by their keywords.
`sessions` | database id of session | Although it shares the name of the previously mentioned cache, it is in essence a different cache because the keys are different. This means that the same `Session` object might be associated with two different keys.
`statistics` | -- | Contains a single, global statistics object.
--
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