Fixed EMM-1034

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/OperationManagerImpl.java

@@ -28,7 +28,6 @@ import org.wso2.carbon.device.mgt.common.authorization.DeviceAccessAuthorization
 import org.wso2.carbon.device.mgt.common.operation.mgt.Operation;
 import org.wso2.carbon.device.mgt.common.operation.mgt.OperationManagementException;
 import org.wso2.carbon.device.mgt.common.operation.mgt.OperationManager;
-import org.wso2.carbon.device.mgt.common.spi.DeviceManagementService;
 import org.wso2.carbon.device.mgt.core.DeviceManagementConstants;
 import org.wso2.carbon.device.mgt.core.dao.DeviceDAO;
 import org.wso2.carbon.device.mgt.core.dao.DeviceManagementDAOException;

components/policy-mgt/org.wso2.carbon.policy.mgt.core/src/main/java/org/wso2/carbon/policy/mgt/core/impl/PolicyAdministratorPointImpl.java

@@ -41,6 +41,7 @@ import org.wso2.carbon.policy.mgt.core.util.PolicyManagementConstants;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 public class PolicyAdministratorPointImpl implements PolicyAdministratorPoint {
 
@@ -123,36 +124,49 @@ public class PolicyAdministratorPointImpl implements PolicyAdministratorPoint {
         try {
             int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
             TaskService taskService = PolicyManagementDataHolder.getInstance().getTaskService();
-            taskService.registerTaskType(PolicyManagementConstants.DELEGATION_TASK_TYPE);
 
             if (log.isDebugEnabled()) {
                 log.debug("Policy delegations task is started for the tenant id " + tenantId);
             }
 
             TaskManager taskManager = taskService.getTaskManager(PolicyManagementConstants.DELEGATION_TASK_TYPE);
-
             TaskInfo.TriggerInfo triggerInfo = new TaskInfo.TriggerInfo();
-
             triggerInfo.setRepeatCount(0);
-
             Map<String, String> properties = new HashMap<>();
             properties.put(PolicyManagementConstants.TENANT_ID, String.valueOf(tenantId));
-
             String taskName = PolicyManagementConstants.DELEGATION_TASK_NAME + "_" + String.valueOf(tenantId);
 
-            if (!taskManager.isTaskScheduled(taskName)) {
+            Set<String> registeredTaskTypes = taskService.getRegisteredTaskTypes();
-
+            //Check whether the TaskType is already registered. If not we'll register it here.
+            if (!registeredTaskTypes.contains(PolicyManagementConstants.DELEGATION_TASK_TYPE)) {
+                taskService.registerTaskType(PolicyManagementConstants.DELEGATION_TASK_TYPE);
+                TaskInfo registeredTaskInfo = null;
+                // getTask method will throw a TaskException if the task is not registered. Hence we'll handle the
+                // exception and register the task.
+                try {
+                    registeredTaskInfo = taskManager.getTask(taskName);
+                } catch (TaskException e) {
+                // No need of any specific logic to handle this exception as it is thrown if the task is not registered.
+                } finally {
+                    // If registeredTaskInfo is null that means there's no registered delegation-task.
+                    if (registeredTaskInfo == null) {
                         TaskInfo taskInfo = new TaskInfo(taskName, PolicyManagementConstants.DELEGATION_TASK_CLAZZ,
                                                          properties, triggerInfo);
-
                         taskManager.registerTask(taskInfo);
-                taskManager.rescheduleTask(taskInfo.getName());
+                        taskManager.scheduleTask(taskInfo.getName());
+                    }
+                }
+            } else {
+                if (!taskManager.isTaskScheduled(taskName)) {
+                    TaskInfo taskInfo = new TaskInfo(taskName, PolicyManagementConstants.DELEGATION_TASK_CLAZZ,
+                                                     properties, triggerInfo);
+                    taskManager.scheduleTask(taskInfo.getName());
                 } else {
                     throw new PolicyManagementException("There is a task already running for policy changes. Please try " +
                                                         "to apply " +
                                                         "changes after few minutes.");
                 }
-
+            }
         } catch (TaskException e) {
             String msg = "Error occurred while creating the policy delegation task for tenant " +
                     PrivilegedCarbonContext.