Complete implementation of device type permanent delete

This service will do following modifications to achieve it's functionality,
 1. Dis-enroll and delete all devices of a device type
 2. Remove platform configuration of a device type
 3. Delete the device type

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/admin/DeviceManagementAdminServiceImpl.java

@@ -169,7 +169,7 @@ public class DeviceManagementAdminServiceImpl implements DeviceManagementAdminSe
         DeviceManagementProviderService deviceManagementProviderService =
                 DeviceMgtAPIUtils.getDeviceManagementService();
         try {
-            if (!deviceManagementProviderService.deleteDevices(deviceIdentifiers, false)) {
+            if (!deviceManagementProviderService.deleteDevices(deviceIdentifiers)) {
                 String msg = "Found un-deployed device type.";
                 log.error(msg);
                 return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderService.java

@@ -611,7 +611,7 @@ public interface DeviceManagementProviderService {
 
     boolean disenrollDevice(DeviceIdentifier deviceId) throws DeviceManagementException;
 
-    boolean deleteDevices(List<String> deviceIdentifiers, boolean transactionAlreadyExists) throws DeviceManagementException, InvalidDeviceException;
+    boolean deleteDevices(List<String> deviceIdentifiers) throws DeviceManagementException, InvalidDeviceException;
 
     boolean isEnrolled(DeviceIdentifier deviceId) throws DeviceManagementException;
 
@@ -773,11 +773,11 @@ public interface DeviceManagementProviderService {
             DeviceManagementException;
 
     /**
-     * Permanently delete a device type
+     * Permanently delete a device type with all it's devices
      *
      * @param deviceTypeName device type name
      * @return True if device type successfully removed
-     * @throws DeviceManagementException
+     * @throws DeviceManagementException Will be thrown if any service level or DAO level error occurs
      */
     boolean deleteDeviceType(String deviceTypeName) throws DeviceManagementException;
 

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderServiceImpl.java

@@ -3630,22 +3630,23 @@ public class DeviceManagementProviderServiceImpl implements DeviceManagementProv
                     }
                     deviceIdentifiers.add(device.getDeviceIdentifier());
                 }
+                DeviceManagementDAOFactory.commitTransaction();
+                DeviceManagementDAOFactory.closeConnection();
                 // delete devices
-                deleteDevices(deviceIdentifiers, true);
+                deleteDevices(deviceIdentifiers);
+                DeviceManagementDAOFactory.beginTransaction();
             }
             // remove device type versions
-            deviceTypeVersions = deviceTypeDAO.getDeviceTypeVersions(
-                    deviceTypeObj.getId(), deviceTypeName);
+            deviceTypeVersions = deviceTypeDAO.getDeviceTypeVersions(deviceTypeObj.getId(), deviceTypeName);
             if (deviceTypeVersions.isEmpty()) {
                 if (log.isDebugEnabled()) {
-                    log.debug("Device type: " + deviceTypeName + "doesn't have any type versions");
+                    log.debug("Device of type: " + deviceTypeName + "doesn't have any type versions");
                 }
             } else {
                 for (DeviceTypeVersion deviceTypeVersion : deviceTypeVersions) {
                     result = deviceTypeDAO.isDeviceTypeVersionModifiable(deviceTypeObj.getId()
                             , deviceTypeVersion.getVersionName(), tenantId);
                     if (!result) {
-                        DeviceManagementDAOFactory.rollbackTransaction();
                         String msg = "Device type of: " + deviceTypeName + "is unauthorized to modify " +
                                      "version";
                         log.error(msg);
@@ -3653,7 +3654,6 @@ public class DeviceManagementProviderServiceImpl implements DeviceManagementProv
                     }
                     result = deviceTypeDAO.updateDeviceTypeVersion(deviceTypeVersion);
                     if (!result) {
-                        DeviceManagementDAOFactory.rollbackTransaction();
                         String msg = "Could not delete the version of device type: " +
                                      deviceTypeName;
                         log.error(msg);