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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| // FLUTTER / DART / THIRD-PARTIES | ||
| import 'dart:convert'; | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:logger/logger.dart'; | ||
|
|
||
| // SERVICES | ||
| import 'package:notredame/core/services/networking_service.dart'; | ||
| import 'package:notredame/core/managers/cache_manager.dart'; | ||
|
|
||
| // MODELS | ||
| import 'package:notredame/core/models/news.dart'; | ||
|
|
||
| // UTILS | ||
| import 'package:notredame/core/utils/cache_exception.dart'; | ||
|
|
||
| // OTHER | ||
| import 'package:notredame/locator.dart'; | ||
|
|
||
| /// Repository to access all the news | ||
| class NewsRepository { | ||
| static const String tag = "NewsRepository"; | ||
|
|
||
| @visibleForTesting | ||
| static const String newsCacheKey = "newsCache"; | ||
|
|
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| final Logger _logger = locator<Logger>(); | ||
|
|
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| /// Cache manager to access and update the cache. | ||
| final CacheManager _cacheManager = locator<CacheManager>(); | ||
|
|
||
| /// Used to verify if the user has connectivity | ||
| final NetworkingService _networkingService = locator<NetworkingService>(); | ||
|
|
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| /// List of the news with 3 test news. | ||
| List<News> _news = <News>[ | ||
| News( | ||
| id: 1, | ||
| title: | ||
| "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec tempus arcu sed quam tincidunt, non venenatis orci mollis.", | ||
| description: "Test 1 description", | ||
| date: DateTime.now(), | ||
| image: "https://picsum.photos/400/200", | ||
| tags: ["tag1", "tag2"], | ||
| ), | ||
| News( | ||
| id: 2, | ||
| title: "Test 2", | ||
| description: "Test 2 description", | ||
| date: DateTime.now(), | ||
| image: "https://picsum.photos/400/200", | ||
| tags: ["tag1", "tag2"], | ||
| ), | ||
| News( | ||
| id: 3, | ||
| title: "Test 3", | ||
| description: "Test 3 description", | ||
| date: DateTime.now(), | ||
| image: "https://picsum.photos/400/200", | ||
| tags: ["tag1", "tag2"], | ||
| ), | ||
| ]; | ||
|
|
||
| List<News> get news => _news; | ||
|
|
||
| /// Get and update the list of news. | ||
| /// After fetching the news from the [?] the [CacheManager] | ||
| /// is updated with the latest version of the news. | ||
| Future<List<News>> getNews({bool fromCacheOnly = false}) async { | ||
| // Force fromCacheOnly mode when user has no connectivity | ||
| if (!(await _networkingService.hasConnectivity())) { | ||
| // ignore: parameter_assignments | ||
| fromCacheOnly = true; | ||
| } | ||
|
|
||
| // Load the news from the cache if the list doesn't exist | ||
| if (_news == null) { | ||
| await getNewsFromCache(); | ||
| } | ||
|
|
||
| if (fromCacheOnly) { | ||
| return _news; | ||
| } | ||
|
|
||
| final List<News> fetchedNews = fetchNewsFromAPI(); | ||
|
|
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| // Update the list of news to avoid duplicate news | ||
| for (final News news in fetchedNews) { | ||
| if (!_news.contains(news)) { | ||
| _news.add(news); | ||
| } | ||
| } | ||
|
|
||
| try { | ||
| // Update cache | ||
| _cacheManager.update(newsCacheKey, jsonEncode(_news)); | ||
| } on CacheException catch (_) { | ||
| // Do nothing, the caching will retry later and the error has been logged by the [CacheManager] | ||
| _logger.e( | ||
| "$tag - getNews: exception raised will trying to update the cache."); | ||
| } | ||
|
|
||
| return _news; | ||
| } | ||
|
|
||
| Future<void> getNewsFromCache() async { | ||
| _news = []; | ||
| try { | ||
| final List responseCache = | ||
| jsonDecode(await _cacheManager.get(newsCacheKey)) as List<dynamic>; | ||
|
|
||
| // Build list of news loaded from the cache. | ||
| _news = responseCache | ||
| .map((e) => News.fromJson(e as Map<String, dynamic>)) | ||
| .toList(); | ||
|
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| _logger | ||
| .d("$tag - getNewsFromCache: ${_news.length} news loaded from cache"); | ||
| } on CacheException catch (_) { | ||
| _logger.e( | ||
| "$tag - getNewsFromCache: exception raised will trying to load news from cache."); | ||
| } | ||
| } | ||
|
|
||
| // TODO : Fetch news from the API | ||
| List<News> fetchNewsFromAPI() { | ||
| final List<News> fetchedNews = []; | ||
|
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| _logger.d("$tag - getNews: fetched ${fetchedNews.length} news."); | ||
|
|
||
| return fetchedNews; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| class News { | ||
| final int id; | ||
| final String title; | ||
| final String description; | ||
| final String image; | ||
| final List<String> tags; | ||
| final DateTime date; | ||
|
|
||
| News({ | ||
| required this.id, | ||
| required this.title, | ||
| required this.description, | ||
| required this.image, | ||
| required this.tags, | ||
| required this.date, | ||
| }); | ||
|
|
||
| /// Used to create [News] instance from a JSON file | ||
| factory News.fromJson(Map<String, dynamic> map) { | ||
| return News( | ||
| id: map['id'] as int, | ||
| title: map['title'] as String, | ||
| description: map['description'] as String, | ||
| image: map['image'] as String, | ||
| tags: map['tags'] as List<String>, | ||
| date: DateTime.parse(map['date'] as String), | ||
| ); | ||
| } | ||
|
|
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| Map<String, dynamic> toJson() { | ||
| return { | ||
| 'id': id, | ||
| 'title': title, | ||
| 'description': description, | ||
| 'image': image, | ||
| 'tags': tags.toList(), | ||
| 'date': date.toString(), | ||
| }; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| // FLUTTER / DART / THIRD-PARTIES | ||
| import 'package:fluttertoast/fluttertoast.dart'; | ||
| import 'package:stacked/stacked.dart'; | ||
| import 'package:flutter_gen/gen_l10n/app_localizations.dart'; | ||
|
|
||
| import 'package:notredame/core/managers/news_repository.dart'; | ||
| import 'package:notredame/core/models/news.dart'; | ||
|
|
||
| import 'package:notredame/locator.dart'; | ||
|
|
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| class NewsViewModel extends FutureViewModel<List<News>> { | ||
| /// Load the events | ||
| final NewsRepository _newsRepository = locator<NewsRepository>(); | ||
|
|
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| /// Localization class of the application. | ||
| final AppIntl _appIntl; | ||
|
|
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| /// News list | ||
| List<News> _news = []; | ||
|
|
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| /// Return the list of all the news. | ||
| List<News> get news { | ||
| _news = []; | ||
|
|
||
| // Build the list of news | ||
| for (final n in _newsRepository.news) { | ||
| _news.add(n); | ||
| } | ||
|
|
||
| return _news; | ||
| } | ||
|
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| NewsViewModel({required AppIntl intl}) : _appIntl = intl; | ||
|
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| bool isLoadingEvents = false; | ||
|
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| @override | ||
| Future<List<News>> futureToRun() async { | ||
| try { | ||
| setBusyForObject(isLoadingEvents, true); | ||
| _news = await _newsRepository.getNews(fromCacheOnly: true); | ||
| notifyListeners(); | ||
| } catch (e) { | ||
| onError(e); | ||
| } finally { | ||
| setBusyForObject(isLoadingEvents, false); | ||
| } | ||
|
|
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| return news; | ||
| } | ||
|
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| @override | ||
| // ignore: type_annotate_public_apis | ||
| void onError(error) { | ||
| Fluttertoast.showToast(msg: _appIntl.error); | ||
| } | ||
|
|
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| Future refresh() async { | ||
| try { | ||
| setBusyForObject(isLoadingEvents, true); | ||
| _newsRepository.getNews(); | ||
| notifyListeners(); | ||
| } on Exception catch (error) { | ||
| onError(error); | ||
| } | ||
| } | ||
| } |
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