49 lines
1.3 KiB
Dart
49 lines
1.3 KiB
Dart
import 'dart:convert';
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import 'package:localstore/localstore.dart';
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import 'package:marianum_mobile/api/apiResponse.dart';
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import 'webuntis/webuntisError.dart';
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abstract class RequestCache<T extends ApiResponse?> {
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static const int cacheNothing = 0;
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static const int cacheMinute = 60;
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static const int cacheHour = 60 * 60;
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static const int cacheDay = 60 * 60 * 24;
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int maxCacheTime;
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Function(T) onUpdate;
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Function(Exception) onError;
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bool? renew;
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RequestCache(this.maxCacheTime, this.onUpdate, {this.onError = ignore, this.renew = false});
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static void ignore(Exception e) {}
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void start(String file, String document) async {
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Map<String, dynamic>? tableData = await Localstore.instance.collection(file).doc(document).get();
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if(tableData != null) {
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onUpdate(onLocalData(tableData['json']));
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}
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if(DateTime.now().millisecondsSinceEpoch - (maxCacheTime * 1000) < (tableData?['lastupdate'] ?? 0)) {
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if(renew == null || !renew!) return;
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}
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try {
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T newValue = await onLoad();
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onUpdate(newValue);
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Localstore.instance.collection(file).doc(document).set({
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"json": jsonEncode(newValue),
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"lastupdate": DateTime.now().millisecondsSinceEpoch
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});
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} on WebuntisError catch(e) {
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onError(e);
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}
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}
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T onLocalData(String json);
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Future<T> onLoad();
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} |