Implement Singleton Pattern for DeviceStatusManagementServiceImpl

components/device-mgt/io.entgra.device.mgt.core.device.mgt.core/src/main/java/io/entgra/device/mgt/core/device/mgt/core/internal/DeviceManagementServiceComponent.java

@@ -383,7 +383,7 @@ public class DeviceManagementServiceComponent {
         bundleContext.registerService(WhiteLabelManagementService.class.getName(), whiteLabelManagementService, null);
 
         /* Registering DeviceState Filter Service */
-        DeviceStatusManagementService deviceStatusManagemntService = new DeviceStatusManagementServiceImpl();
+        DeviceStatusManagementService deviceStatusManagemntService = DeviceStatusManagementServiceImpl.getInstance();
         DeviceManagementDataHolder.getInstance().setDeviceStatusManagementService(deviceStatusManagemntService);
         try {
             deviceStatusManagemntService.addDefaultDeviceStatusFilterIfNotExist(tenantId);

components/device-mgt/io.entgra.device.mgt.core.device.mgt.core/src/main/java/io/entgra/device/mgt/core/device/mgt/core/metadata/mgt/DeviceStatusManagementServiceImpl.java

@@ -48,15 +48,24 @@ public class DeviceStatusManagementServiceImpl implements DeviceStatusManagement
 
     private static final Log log = LogFactory.getLog(DeviceStatusManagementServiceImpl.class);
 
+    private static DeviceStatusManagementServiceImpl instance;
+
     private final MetadataDAO metadataDAO;
 
     private final Gson gson;
 
-    public DeviceStatusManagementServiceImpl() {
+    private DeviceStatusManagementServiceImpl() {
         this.metadataDAO = MetadataManagementDAOFactory.getMetadataDAO();
         this.gson = new Gson();
     }
 
+    public static synchronized DeviceStatusManagementServiceImpl getInstance() {
+        if (instance == null) {
+            instance = new DeviceStatusManagementServiceImpl();
+        }
+        return instance;
+    }
+
     @Override
     public void addDefaultDeviceStatusFilterIfNotExist(int tenantId) throws MetadataManagementException {
         try {

components/device-mgt/io.entgra.device.mgt.core.device.mgt.core/src/test/java/io/entgra/device/mgt/core/device/mgt/core/search/DeviceDetails.java

@@ -43,7 +43,7 @@ public class DeviceDetails extends BaseDeviceManagementTest {
             DeviceManagementProviderService deviceManagementProviderService = new DeviceManagementProviderServiceImpl();
             DeviceManagementDataHolder.getInstance().setDeviceManagementProvider(deviceManagementProviderService);
 
-            DeviceStatusManagementService deviceStatusManagementService = new DeviceStatusManagementServiceImpl();
+            DeviceStatusManagementService deviceStatusManagementService = DeviceStatusManagementServiceImpl.getInstance();
             DeviceManagementDataHolder.getInstance().setDeviceStatusManagementService(deviceStatusManagementService);
     }
 

components/tenant-mgt/io.entgra.device.mgt.core.tenant.mgt.core/src/main/java/io/entgra/device/mgt/core/tenant/mgt/core/internal/TenantMgtServiceComponent.java

@@ -66,7 +66,7 @@ public class TenantMgtServiceComponent {
             componentContext.getBundleContext().registerService(WhiteLabelManagementServiceImpl.class.getName(),
                     whiteLabelManagementService, null);
             TenantMgtDataHolder.getInstance().setWhiteLabelManagementService(whiteLabelManagementService);
-            DeviceStatusManagementService deviceStatusManagementService = new DeviceStatusManagementServiceImpl();
+            DeviceStatusManagementService deviceStatusManagementService = DeviceStatusManagementServiceImpl.getInstance();
             componentContext.getBundleContext().registerService(DeviceStatusManagementService.class.getName(),
                     deviceStatusManagementService, null);
             TenantMgtDataHolder.getInstance().setDeviceStatusManagementService(deviceStatusManagementService);