Development: Improve boundary cases with Hazelcast

src/main/java/de/tum/cit/aet/artemis/buildagent/service/SharedQueueProcessingService.java

@@ -23,14 +23,15 @@
 import java.util.concurrent.locks.ReentrantLock;
 import java.util.stream.Collectors;
 
-import jakarta.annotation.PostConstruct;
 import jakarta.annotation.PreDestroy;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
 import org.springframework.context.annotation.Profile;
+import org.springframework.context.event.EventListener;
 import org.springframework.scheduling.TaskScheduler;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
@@ -40,6 +41,7 @@
 import com.hazelcast.collection.ItemEvent;
 import com.hazelcast.collection.ItemListener;
 import com.hazelcast.core.HazelcastInstance;
+import com.hazelcast.core.HazelcastInstanceNotActiveException;
 import com.hazelcast.map.IMap;
 import com.hazelcast.topic.ITopic;
 
@@ -130,7 +132,7 @@ public SharedQueueProcessingService(@Qualifier("hazelcastInstance") HazelcastIns
     /**
      * Initialize relevant data from hazelcast
      */
-    @PostConstruct
+    @EventListener(ApplicationReadyEvent.class)
     public void init() {
         this.buildAgentInformation = this.hazelcastInstance.getMap("buildAgentInformation");
         this.processingJobs = this.hazelcastInstance.getMap("processingJobs");
@@ -172,7 +174,15 @@ public void removeListenerAndCancelScheduledFuture() {
     }
 
     private void removeListener() {
-        this.queue.removeItemListener(this.listenerId);
+        // check if Hazelcast is still active, before invoking this
+        try {
+            if (hazelcastInstance != null && hazelcastInstance.getLifecycleService().isRunning()) {
+                this.queue.removeItemListener(this.listenerId);
+            }
+        }
+        catch (HazelcastInstanceNotActiveException e) {
+            log.error("Failed to remove listener from SharedQueueProcessingService as Hazelcast instance is not active any more.");
+        }
     }
 
     private void cancelCheckAvailabilityAndProcessNextBuildScheduledFuture() {
@@ -205,7 +215,7 @@ public void updateBuildAgentInformation() {
      * If so, process the next build job.
      */
     private void checkAvailabilityAndProcessNextBuild() {
-        if (noDataMemberInClusterAvailable(hazelcastInstance)) {
+        if (noDataMemberInClusterAvailable(hazelcastInstance) || queue == null) {
             log.debug("There are only lite member in the cluster. Not processing build jobs.");
             return;
         }

src/main/java/de/tum/cit/aet/artemis/exercise/web/ParticipationTeamWebsocketService.java

@@ -10,11 +10,10 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-import jakarta.annotation.PostConstruct;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
 import org.springframework.context.annotation.Profile;
 import org.springframework.context.event.EventListener;
 import org.springframework.messaging.handler.annotation.DestinationVariable;
@@ -31,6 +30,7 @@
 import org.springframework.web.socket.messaging.SessionUnsubscribeEvent;
 
 import com.hazelcast.core.HazelcastInstance;
+import com.hazelcast.core.HazelcastInstanceNotActiveException;
 
 import de.tum.cit.aet.artemis.communication.service.WebsocketMessagingService;
 import de.tum.cit.aet.artemis.core.domain.User;
@@ -96,7 +96,7 @@ public ParticipationTeamWebsocketService(WebsocketMessagingService websocketMess
     /**
      * Initialize relevant data from hazelcast
      */
-    @PostConstruct
+    @EventListener(ApplicationReadyEvent.class)
     public void init() {
         // participationId-username -> timestamp
         this.lastTypingTracker = hazelcastInstance.getMap("lastTypingTracker");
@@ -307,11 +307,19 @@ public void handleDisconnect(SessionDisconnectEvent event) {
      * @param sessionId id of the sessions which is unsubscribing
      */
     public void unsubscribe(String sessionId) {
-        Optional.ofNullable(destinationTracker.get(sessionId)).ifPresent(destination -> {
-            Long participationId = getParticipationIdFromDestination(destination);
-            sendOnlineTeamStudents(participationId, sessionId);
-            destinationTracker.remove(sessionId);
-        });
+        // check if Hazelcast is still active, before invoking this
+        try {
+            if (hazelcastInstance != null && hazelcastInstance.getLifecycleService().isRunning()) {
+                Optional.ofNullable(destinationTracker.get(sessionId)).ifPresent(destination -> {
+                    destinationTracker.remove(sessionId);
+                    Long participationId = getParticipationIdFromDestination(destination);
+                    sendOnlineTeamStudents(participationId, sessionId);
+                });
+            }
+        }
+        catch (HazelcastInstanceNotActiveException e) {
+            log.error("Failed to unsubscribe as Hazelcast is no longer active");
+        }
     }
 
     /**

src/main/java/de/tum/cit/aet/artemis/programming/service/localci/LocalCIResultProcessingService.java

@@ -7,19 +7,21 @@
 import java.util.UUID;
 import java.util.concurrent.CancellationException;
 
-import jakarta.annotation.PostConstruct;
 import jakarta.annotation.PreDestroy;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
 import org.springframework.context.annotation.Profile;
+import org.springframework.context.event.EventListener;
 import org.springframework.stereotype.Service;
 
 import com.hazelcast.collection.IQueue;
 import com.hazelcast.collection.ItemEvent;
 import com.hazelcast.collection.ItemListener;
 import com.hazelcast.core.HazelcastInstance;
+import com.hazelcast.core.HazelcastInstanceNotActiveException;
 import com.hazelcast.map.IMap;
 
 import de.tum.cit.aet.artemis.assessment.domain.Result;
@@ -90,16 +92,28 @@ public LocalCIResultProcessingService(@Qualifier("hazelcastInstance") HazelcastI
     /**
      * Initializes the result queue, build agent information map and the locks.
      */
-    @PostConstruct
+    @EventListener(ApplicationReadyEvent.class)
     public void init() {
         this.resultQueue = this.hazelcastInstance.getQueue("buildResultQueue");
         this.buildAgentInformation = this.hazelcastInstance.getMap("buildAgentInformation");
         this.listenerId = resultQueue.addItemListener(new ResultQueueListener(), true);
     }
 
+    /**
+     * Removes the item listener from the Hazelcast result queue if the instance is active.
+     * Logs an error if Hazelcast is not running.
+     */
     @PreDestroy
     public void removeListener() {
-        this.resultQueue.removeItemListener(this.listenerId);
+        // check if Hazelcast is still active, before invoking this
+        try {
+            if (hazelcastInstance != null && hazelcastInstance.getLifecycleService().isRunning()) {
+                this.resultQueue.removeItemListener(this.listenerId);
+            }
+        }
+        catch (HazelcastInstanceNotActiveException e) {
+            log.error("Could not remove listener as hazelcast instance is not active.");
+        }
     }
 
     /**