Add callback executor for device state service

application/src/main/java/org/thingsboard/server/service/state/DefaultDeviceStateService.java

@@ -191,6 +191,7 @@ public class DefaultDeviceStateService extends AbstractPartitionBasedService<Dev
     private int telemetryTtl;
 
     private ListeningExecutorService deviceStateExecutor;
+    private ListeningExecutorService deviceStateCallbackExecutor;
 
     final ConcurrentMap<DeviceId, DeviceStateData> deviceStates = new ConcurrentHashMap<>();
 
@@ -199,6 +200,8 @@ public class DefaultDeviceStateService extends AbstractPartitionBasedService<Dev
         super.init();
         deviceStateExecutor = MoreExecutors.listeningDecorator(ThingsBoardExecutors.newWorkStealingPool(
                 Math.max(4, Runtime.getRuntime().availableProcessors()), "device-state"));
+        deviceStateCallbackExecutor = MoreExecutors.listeningDecorator(ThingsBoardExecutors.newWorkStealingPool(
+                Math.max(4, Runtime.getRuntime().availableProcessors()), "device-state-callback"));
         scheduledExecutor.scheduleWithFixedDelay(this::checkStates, new Random().nextInt(defaultStateCheckIntervalInSec), defaultStateCheckIntervalInSec, TimeUnit.SECONDS);
         scheduledExecutor.scheduleWithFixedDelay(this::reportActivityStats, defaultActivityStatsIntervalInSec, defaultActivityStatsIntervalInSec, TimeUnit.SECONDS);
     }
@@ -209,6 +212,9 @@ public class DefaultDeviceStateService extends AbstractPartitionBasedService<Dev
         if (deviceStateExecutor != null) {
             deviceStateExecutor.shutdownNow();
         }
+        if (deviceStateCallbackExecutor != null) {
+            deviceStateCallbackExecutor.shutdownNow();
+        }
     }
 
     @Override
@@ -372,7 +378,7 @@ public class DefaultDeviceStateService extends AbstractPartitionBasedService<Dev
                                 log.warn("Failed to register device to the state service", t);
                                 callback.onFailure(t);
                             }
-                        }, deviceStateExecutor);
+                        }, deviceStateCallbackExecutor);
                     } else if (proto.getUpdated()) {
                         DeviceStateData stateData = getOrFetchDeviceStateData(device.getId());
                         TbMsgMetaData md = new TbMsgMetaData();
@@ -635,10 +641,10 @@ public class DefaultDeviceStateService extends AbstractPartitionBasedService<Dev
         ListenableFuture<DeviceStateData> future;
         if (persistToTelemetry) {
             ListenableFuture<List<TsKvEntry>> tsData = tsService.findLatest(TenantId.SYS_TENANT_ID, device.getId(), PERSISTENT_ATTRIBUTES);
-            future = Futures.transform(tsData, extractDeviceStateData(device), deviceStateExecutor);
+            future = Futures.transform(tsData, extractDeviceStateData(device), MoreExecutors.directExecutor());
         } else {
             ListenableFuture<List<AttributeKvEntry>> attrData = attributesService.find(TenantId.SYS_TENANT_ID, device.getId(), SERVER_SCOPE, PERSISTENT_ATTRIBUTES);
-            future = Futures.transform(attrData, extractDeviceStateData(device), deviceStateExecutor);
+            future = Futures.transform(attrData, extractDeviceStateData(device), MoreExecutors.directExecutor());
         }
         return transformInactivityTimeout(future);
     }
@@ -656,8 +662,8 @@ public class DefaultDeviceStateService extends AbstractPartitionBasedService<Dev
                     }
                 });
                 return deviceStateData;
-            }, deviceStateExecutor);
-        }, deviceStateExecutor);
+            }, MoreExecutors.directExecutor());
+        }, deviceStateCallbackExecutor);
     }
 
     private <T extends KvEntry> Function<List<T>, DeviceStateData> extractDeviceStateData(Device device) {