private void fetchFromServer()
    {
        Flowable<List<UserRole>> userRoles = mainApi.getUserOpRoles();
        Flowable<List<EventInfo>> eventInfos = mainApi.getEventInfos();
        Flowable<List<ObjectTypes>> objectTypes = mainApi.getObjectTypes();
        Flowable<List<ObjectProps>> objectProps = mainApi.getObjectProps();
        Flowable<List<ObjectGroups>> objectGroups = mainApi.getObjectGroups();
        Flowable<List<EventProps>> eventProps = mainApi.getEventProps();
        Flowable<List<LookupData>> lookupData = mainApi.getLookupData();

        disposable = Flowable.zip(userRoles, eventInfos, objectTypes, objectProps, objectGroups, eventProps, lookupData,
                (userRoles12, eventInfos1, objectTypes1, objectProps1, objectGroups1, eventProps1, lookupData1) -> {
            appDatabase.userRolesDao().insertList(userRoles12);
            appDatabase.eventInfoDao().insertList(eventInfos1);
            appDatabase.objectTypesDao().insertList(objectTypes1);
            appDatabase.objectGroupsDao().insertList(objectGroups1);
            appDatabase.eventPropsDao().insertList(eventProps1);
            appDatabase.lookupDataDao().insertList(lookupData1);
            return true;
        }).onErrorReturnItem(false).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(aBoolean -> {
            sessionManager.setDataLoaded(aBoolean);
            if(aBoolean)
            {
                List<UserRole> userRoles1 = appDatabase.userRolesDao().getItems();
                for (int i = 0; i < userRoles1.size(); i++) {
                    UserRole userRole = userRoles1.get(i);
                    int iconId = appDatabase.activeDrawableEntityDao().getDrawable(userRole.iconKey) == null ?
                            0 : appDatabase.activeDrawableEntityDao().getDrawable(userRole.iconKey);
                    mMenu.add(R.id.nav_grp1, userRole.opRoleKey, userRole.opRoleKey, userRole.opRoleName).setIcon(iconId);
                    MenuItem menuItem = mMenu.getItem(size++);
                    if (i == 0) {
                        if (sessionManager.getDefaultUserRoleKey() == 0) {
                            sessionManager.setDefaultUserRoleKey(userRole.opRoleKey);
                        }
                    }
                    sessionManager.addMenu(menuItem, userRole.opRoleKey);
                    if (userRole.opRoleKey == sessionManager.getDefaultUserRoleKey()) {
                        menuItem.setChecked(true);
                        sessionManager.setCurrentSelectedMenu(menuItem.getItemId());
                    }
                }
                sessionManager.setDataLoaded(true);
                mainViewModel.setCompleteSync(sessionManager.getDefaultUserRoleKey());
                toolbar.setTitle(mainViewModel.getUserRoleTitle(sessionManager.getDefaultUserRoleKey()));
            }
        }, Timber::e);
    }