Improvement to handling of subscription updates

@@ -21,12 +21,6 @@ import org.springframework.context.annotation.Lazy;
 import org.springframework.context.event.EventListener;
 import org.springframework.stereotype.Service;
 import org.thingsboard.common.util.ThingsBoardThreadFactory;
-import org.thingsboard.server.common.data.EntityType;
-import org.thingsboard.server.common.data.EntityView;
-import org.thingsboard.server.common.data.id.EntityId;
-import org.thingsboard.server.common.data.id.EntityViewId;
-import org.thingsboard.server.common.data.id.TenantId;
-import org.thingsboard.server.dao.entityview.EntityViewService;
 import org.thingsboard.server.gen.transport.TransportProtos;
 import org.thingsboard.server.queue.discovery.ClusterTopologyChangeEvent;
 import org.thingsboard.server.queue.discovery.PartitionChangeEvent;
@@ -36,7 +30,6 @@ import org.thingsboard.server.common.msg.queue.TopicPartitionInfo;
 import org.thingsboard.server.common.msg.queue.TbCallback;
 import org.thingsboard.server.queue.util.TbCoreComponent;
 import org.thingsboard.server.service.queue.TbClusterService;
-import org.thingsboard.server.service.telemetry.DefaultTelemetryWebSocketService;
 import org.thingsboard.server.service.telemetry.sub.AlarmSubscriptionUpdate;
 import org.thingsboard.server.service.telemetry.sub.TelemetrySubscriptionUpdate;
 
@@ -49,7 +42,6 @@ import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
-import java.util.stream.Collectors;
 
 @Slf4j
 @TbCoreComponent
@@ -60,9 +52,6 @@ public class DefaultTbLocalSubscriptionService implements TbLocalSubscriptionSer
     private final Map<String, Map<Integer, TbSubscription>> subscriptionsBySessionId = new ConcurrentHashMap<>();
 
     @Autowired
-    private EntityViewService entityViewService;
-
-    @Autowired
     private PartitionService partitionService;
 
     @Autowired
@@ -72,17 +61,17 @@ public class DefaultTbLocalSubscriptionService implements TbLocalSubscriptionSer
     @Lazy
     private SubscriptionManagerService subscriptionManagerService;
 
-    private ExecutorService wsCallBackExecutor;
+    private ExecutorService subscriptionUpdateExecutor;
 
     @PostConstruct
     public void initExecutor() {
-        wsCallBackExecutor = Executors.newSingleThreadExecutor(ThingsBoardThreadFactory.forName("ws-sub-callback"));
+        subscriptionUpdateExecutor = Executors.newWorkStealingPool(20);
     }
 
     @PreDestroy
     public void shutdownExecutor() {
-        if (wsCallBackExecutor != null) {
-            wsCallBackExecutor.shutdownNow();
+        if (subscriptionUpdateExecutor != null) {
+            subscriptionUpdateExecutor.shutdownNow();
         }
     }
 
@@ -148,7 +137,7 @@ public class DefaultTbLocalSubscriptionService implements TbLocalSubscriptionSer
                     update.getLatestValues().forEach((key, value) -> attrSub.getKeyStates().put(key, value));
                     break;
             }
-            subscription.getUpdateConsumer().accept(sessionId, update);
+            subscriptionUpdateExecutor.submit(() -> subscription.getUpdateConsumer().accept(sessionId, update));
         }
         callback.onSuccess();
     }
@@ -158,7 +147,7 @@ public class DefaultTbLocalSubscriptionService implements TbLocalSubscriptionSer
         TbSubscription subscription = subscriptionsBySessionId
                 .getOrDefault(sessionId, Collections.emptyMap()).get(update.getSubscriptionId());
         if (subscription != null && subscription.getType() == TbSubscriptionType.ALARMS) {
-            subscription.getUpdateConsumer().accept(sessionId, update);
+            subscriptionUpdateExecutor.submit(() -> subscription.getUpdateConsumer().accept(sessionId, update));
         }
         callback.onSuccess();
     }

@@ -941,8 +941,8 @@
         "provision-strategy": "Provision strategy",
         "provision-strategy-required": "Provision strategy is required.",
         "provision-strategy-disabled": "Disabled",
-        "provision-strategy-created-new": "Allow create new devices",
-        "provision-strategy-check-pre-provisioned": "Check pre provisioned devices",
+        "provision-strategy-created-new": "Allow to create new devices",
+        "provision-strategy-check-pre-provisioned": "Check for pre-provisioned devices",
         "provision-device-key": "Provision device key",
         "provision-device-key-required": "Provision device key is required.",
         "provision-device-secret": "Provision device secret",