dbeaver/dbeaver-ee#625 delete tasks from scheduler when deleting from project

plugins/org.jkiss.dbeaver.tasks.ui/src/org/jkiss/dbeaver/tasks/ui/internal/TaskUIMessages.java

@@ -110,6 +110,8 @@ public class TaskUIMessages extends NLS {
 	public static String task_handler_delete_confirm_question_delete_task;
 	public static String task_handler_delete_confirm_title_delete_tasks;
 	public static String task_handler_delete_confirm_question_delete_tasks;
+	public static String task_handler_delete_error_deleting_task_from_scheduler_title;
+	public static String task_handler_delete_error_deleting_task_from_scheduler_message;
 
 	public static String task_configuration_wizard_page_task_error_message_enter_task_name;
 	public static String task_configuration_wizard_page_task_already_exists;

plugins/org.jkiss.dbeaver.tasks.ui/src/org/jkiss/dbeaver/tasks/ui/internal/TaskUIMessages.properties

@@ -86,6 +86,8 @@ task_handler_delete_confirm_title_delete_task = Delete task
 task_handler_delete_confirm_question_delete_task = Are you sure you want to delete task "{0}"?
 task_handler_delete_confirm_title_delete_tasks = Delete tasks
 task_handler_delete_confirm_question_delete_tasks = Are you sure you want to delete {0} tasks?
+task_handler_delete_error_deleting_task_from_scheduler_title = Task deletion error
+task_handler_delete_error_deleting_task_from_scheduler_message = Unable to delete task {0} from scheduler. The task won't be deleted from the project.
 task_configuration_wizard_page_task_error_message_enter_task_name = Enter task name (unique)
 task_configuration_wizard_page_task_already_exists = Task "{0}" already exists in project "{1}"
 task_configuration_wizard_page_task_enter_type = Enter task type

plugins/org.jkiss.dbeaver.tasks.ui/src/org/jkiss/dbeaver/tasks/ui/view/TaskHandlerDelete.java

@@ -23,7 +23,12 @@ import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.ui.handlers.HandlerUtil;
+import org.jkiss.dbeaver.DBException;
+import org.jkiss.dbeaver.model.task.DBTScheduler;
 import org.jkiss.dbeaver.model.task.DBTTask;
+import org.jkiss.dbeaver.model.task.DBTTaskScheduleInfo;
+import org.jkiss.dbeaver.registry.task.TaskRegistry;
+import org.jkiss.dbeaver.runtime.DBWorkbench;
 import org.jkiss.dbeaver.tasks.ui.internal.TaskUIMessages;
 import org.jkiss.dbeaver.ui.UIUtils;
 
@@ -58,7 +63,23 @@ public class TaskHandlerDelete extends AbstractHandler {
                     return null;
                 }
             }
+            DBTScheduler scheduler = TaskRegistry.getInstance().getActiveSchedulerInstance();
             for (DBTTask task : tasksToDelete) {
+                if (scheduler != null) {
+                    DBTTaskScheduleInfo taskScheduleInfo = scheduler.getScheduledTaskInfo(task);
+                    if (taskScheduleInfo != null) {
+                        try {
+                            scheduler.removeTaskSchedule(task, taskScheduleInfo);
+                        } catch (DBException e) {
+                            DBWorkbench.getPlatformUI().showError(
+                                TaskUIMessages.task_handler_delete_error_deleting_task_from_scheduler_title,
+                                NLS.bind(TaskUIMessages.task_handler_delete_error_deleting_task_from_scheduler_message, task.getId()),
+                                e
+                            );
+                            continue;
+                        }
+                    }
+                }
                 task.getProject().getTaskManager().deleteTaskConfiguration(task);
             }
         }