synchronized running exam cache load to prevent multiple long running

transactions while loading an Exam

src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/ExamSessionCacheService.java

@@ -69,7 +69,7 @@ public class ExamSessionCacheService {
             cacheNames = CACHE_NAME_RUNNING_EXAM,
             key = "#examId",
             unless = "#result == null")
-    public Exam getRunningExam(final Long examId) {
+    public synchronized Exam getRunningExam(final Long examId) {
 
         if (log.isDebugEnabled()) {
             log.debug("Verify running exam for id: {}", examId);

src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/ExamSessionServiceImpl.java

@@ -193,7 +193,7 @@ public class ExamSessionServiceImpl implements ExamSessionService {
     }
 
     @Override
-    public Result<Exam> getRunningExam(final Long examId) {
+    public synchronized Result<Exam> getRunningExam(final Long examId) {
         if (log.isTraceEnabled()) {
             log.trace("Running exam request for exam {}", examId);
         }

src/main/java/ch/ethz/seb/sebserver/webservice/weblayer/oauth/CachableJdbcTokenStore.java

@@ -39,7 +39,6 @@ public class CachableJdbcTokenStore implements TokenStore {
     }
 
     @Override
-    @Transactional
     public OAuth2AccessToken getAccessToken(final OAuth2Authentication authentication) {
         return this.jdbcTokenStore.getAccessToken(authentication);
     }

src/main/resources/config/application-dev-gui.properties

@@ -8,7 +8,7 @@ sebserver.gui.webservice.address=localhost
 sebserver.gui.webservice.port=8080
 sebserver.gui.webservice.apipath=/admin-api/v1
 # defines the polling interval that is used to poll the webservice for client connection data on a monitored exam page
-sebserver.gui.webservice.poll-interval=1000
+#sebserver.gui.webservice.poll-interval=1000
 
 sebserver.gui.theme=css/sebserver.css
 sebserver.gui.list.page.size=15

src/main/resources/config/application-dev-ws.properties

@@ -13,7 +13,7 @@ spring.datasource.hikari.initializationFailTimeout=30000
 spring.datasource.hikari.connectionTimeout=30000
 spring.datasource.hikari.idleTimeout=600000
 spring.datasource.hikari.maxLifetime=1800000
-spring.datasource.hikari.maximumPoolSize=500
+spring.datasource.hikari.maximumPoolSize=5
 
 sebserver.http.client.connect-timeout=15000
 sebserver.http.client.connection-request-timeout=10000
@@ -23,7 +23,7 @@ sebserver.webservice.clean-db-on-startup=false
 
 # webservice configuration
 sebserver.init.adminaccount.gen-on-init=false
-sebserver.webservice.distributed=false
+sebserver.webservice.distributed=true
 sebserver.webservice.master.delay.threshold=10000
 sebserver.webservice.http.external.scheme=http
 sebserver.webservice.http.external.servername=localhost

src/main/resources/config/application-gui.properties

@@ -25,14 +25,13 @@ sebserver.gui.entrypoint=/gui
 
 sebserver.gui.webservice.apipath=${sebserver.webservice.api.admin.endpoint}
 # defines the polling interval that is used to poll the webservice for client connection data on a monitored exam page
-sebserver.gui.webservice.poll-interval=3000
+sebserver.gui.webservice.poll-interval=2000
 sebserver.gui.webservice.mock-lms-enabled=true
 sebserver.gui.webservice.edx-lms-enabled=true
 sebserver.gui.webservice.moodle-lms-enabled=true
 sebserver.gui.seb.client.config.download.filename=SEBServerSettings.seb
 sebserver.gui.seb.exam.config.download.filename=SEBExamSettings.seb
 sebserver.gui.proctoring.zoom.websdk.version=1.9.8
-
 sebserver.gui.filter.date.from.years=2
 
 # remote proctoring

src/main/resources/config/application-ws.properties

@@ -31,7 +31,7 @@ spring.datasource.hikari.initializationFailTimeout=3000
 spring.datasource.hikari.connectionTimeout=30000
 spring.datasource.hikari.idleTimeout=600000
 spring.datasource.hikari.maxLifetime=1800000
-spring.datasource.hikari.maximumPoolSize=500
+spring.datasource.hikari.maximumPoolSize=100
 
 ### webservice security
 spring.datasource.password=${sebserver.mariadb.password}