Merge pull request #5 from Pairman/patch-1

Patch 1

Author: Pairman

lib/model/xidian_ids/score.g.dart

@@ -8,6 +8,7 @@ import 'package:watermeter/model/xidian_ids/score.dart';
 import 'package:watermeter/page/public_widget/public_widget.dart';
 import 'package:watermeter/page/score/score_page.dart';
 import 'package:watermeter/page/score/score_state.dart';
+import 'package:watermeter/repository/network_session.dart';
 import 'package:watermeter/repository/xidian_ids/ehall_score_session.dart';
 
 class ScoreWindow extends StatefulWidget {
@@ -18,6 +19,7 @@ class ScoreWindow extends StatefulWidget {
 }
 
 class _ScoreWindowState extends State<ScoreWindow> {
+  static const scoreListCacheName = "scores.json";
   late Future<List<Score>> scoreList;
 
   Navigator _getNavigator(BuildContext context, Widget child) {
@@ -28,12 +30,55 @@ class _ScoreWindowState extends State<ScoreWindow> {
     );
   }
 
-  void dataInit() => scoreList = ScoreSession().getScore();
+  Future<List<Score>> loadScoreListCache() async {
+    log.i(
+      "[ScoreWindow][loadScoreListCache] "
+      "Path at ${supportPath.path}/$scoreListCacheName.",
+    );
+    file = File("${supportPath.path}/$scoreListCacheName");
+    if (file.existsSync()) {
+      final timeDiff = DateTime.now().difference(
+        file.lastModifiedSync()
+      ).inDays;
+      if (timeDiff < 1) {
+        log.i(
+          "[ScoreWindow][loadScoreListCache] "
+          "Load effective cache file.",
+        );
+      return jsonDecode(file.readAsStringSync()).map(
+        (s) => Score.fromJson(s)
+      ).toList();
+      }
+    }
+    log.i(
+      "[ScoreWindow][loadScoreListCache] "
+      "Cache file non-existent or ineffective.",
+    );
+    return [];
+  }
+
+  void dumpScoreListCache(List<Score> scores) {
+    file.writeAsStringSync(
+      jsonEncode(scores.map((s) => s.toJson()).toList())
+    );
+  }
+
+  Future<void> dataInit async () {
+    final cache = await loadScoreListCache();
+    if (scoreList.isEmpty) {
+      log.i(
+        "[ScoreWindow][loadScoreListCache] "
+        "Get scores via ScoreSession.",
+      );
+      scoreList = ScoreSession().getScore();
+    } else {
+      scoreList = Future.value(cache);
+    }
+  }
 
   @override
   void initState() {
-    dataInit();
-    super.initState();
+    dataInit().then(() => super.initState())
   }
 
   @override