Extract common metadata retrieval and parsing logic to a separate method

- Removed code duplication by creating `retrieveAndParseMetadata` method.
- Improved memory optimization by declaring Gson as a class-level variable.

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

@@ -50,8 +50,11 @@ public class DeviceStatusManagementServiceImpl implements DeviceStatusManagement
 
     private final MetadataDAO metadataDAO;
 
+    private final Gson gson;
+
     public DeviceStatusManagementServiceImpl() {
         this.metadataDAO = MetadataManagementDAOFactory.getMetadataDAO();
+        this.gson = new Gson();
     }
 
     @Override
@@ -138,7 +141,6 @@ public class DeviceStatusManagementServiceImpl implements DeviceStatusManagement
             // Retrieve the current device status metadata
             Metadata metadata = metadataDAO.getMetadata(tenantId, MetadataConstants.ALLOWED_DEVICE_STATUS_META_KEY);
             if (metadata != null) {
-                Gson gson = new Gson();
                 Type listType = new TypeToken<List<AllowedDeviceStatus>>() {
                 }.getType();
                 List<AllowedDeviceStatus> currentStatusList = gson.fromJson(metadata.getMetaValue(), listType);
@@ -198,54 +200,37 @@ public class DeviceStatusManagementServiceImpl implements DeviceStatusManagement
 
     @Override
     public List<AllowedDeviceStatus> getDeviceStatusFilters(int tenantId) throws MetadataManagementException {
-        try {
-            MetadataManagementDAOFactory.openConnection();
-            Metadata metadata = metadataDAO.getMetadata(tenantId, MetadataConstants.ALLOWED_DEVICE_STATUS_META_KEY);
-            Gson gson = new Gson();
-            Type listType = new TypeToken<List<AllowedDeviceStatus>>() {}.getType();
-            List<AllowedDeviceStatus> statusList = gson.fromJson(metadata.getMetaValue(), listType);
-
-            return statusList;
-        } catch (MetadataManagementDAOException e) {
-            String msg = "Error occurred while retrieving device status meta data for tenant:" + tenantId;
-            log.error(msg, e);
-            throw new MetadataManagementException(msg, e);
-        } catch (SQLException e) {
-            String msg = "Error occurred while opening a connection to the data source";
-            log.error(msg, e);
-            throw new MetadataManagementException(msg, e);
-        } finally {
-            MetadataManagementDAOFactory.closeConnection();
+        return retrieveAndParseMetadata(tenantId);
     }
 
+    public List<String> getDeviceStatusFilters(String deviceType, int tenantId) throws MetadataManagementException {
+        List<AllowedDeviceStatus> statusList = retrieveAndParseMetadata(tenantId);
+        for (AllowedDeviceStatus status : statusList) {
+            if (status.getType().equalsIgnoreCase(deviceType)) {
+                return status.getStatus();
+            }
+        }
+        // Device type not found in metadata
+        return Collections.emptyList();
     }
 
-    public List<String> getDeviceStatusFilters(String deviceType, int tenantId) throws MetadataManagementException {
+    private List<AllowedDeviceStatus> retrieveAndParseMetadata(int tenantId) throws MetadataManagementException {
         MetadataManagementService metadataManagementService = new MetadataManagementServiceImpl();
         Metadata metadata = metadataManagementService.retrieveMetadata(MetadataConstants.ALLOWED_DEVICE_STATUS_META_KEY);
-        Gson gson = new Gson();
         String metaValue;
         if (metadata != null) {
             metaValue = metadata.getMetaValue();
         } else {
-            List<DeviceStatusItem> statusList = getDefaultDeviceStatus();
-            metaValue = gson.toJson(statusList);
+            List<DeviceStatusItem> defaultStatusList = getDefaultDeviceStatus();
+            metaValue = gson.toJson(defaultStatusList);
             addDefaultDeviceStatusFilters(tenantId);
         }
-        Type listType = new TypeToken<List<AllowedDeviceStatus>>() {
-        }.getType();
-        List<AllowedDeviceStatus> statusList = gson.fromJson(metaValue, listType);
-
-        for (AllowedDeviceStatus status : statusList) {
-            if (status.getType().equalsIgnoreCase(deviceType)) {
-                return status.getStatus();
-            }
-        }
-        // Device type not found in metadata
-        return Collections.emptyList();
+        Type listType = new TypeToken<List<AllowedDeviceStatus>>() {}.getType();
+        return gson.fromJson(metaValue, listType);
     }
 
 
+
     @Override
     public boolean getDeviceStatusCheck(int tenantId) throws MetadataManagementException {
         MetadataManagementService metadataManagementService = new MetadataManagementServiceImpl();
@@ -263,7 +248,6 @@ public class DeviceStatusManagementServiceImpl implements DeviceStatusManagement
         MetadataManagementService metadataManagementService = new MetadataManagementServiceImpl();
         Metadata metadata = metadataManagementService.retrieveMetadata(MetadataConstants.ALLOWED_DEVICE_STATUS_META_KEY);
         String metaValue;
-        Gson gson = new Gson();
         if (metadata != null) {
             metaValue = metadata.getMetaValue();
         } else {