Kingkor Roy Tirtho
61958c7d94
Separated common logic of both `InfiniteQuery` and `Query` in a base class `BaseQuery` resulting in `InfiniteQuery` inheriting already having implemented features of `Query`
63 lines
1.5 KiB
Dart
63 lines
1.5 KiB
Dart
import 'package:fl_query/src/query_bowl.dart';
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import 'package:flutter/widgets.dart';
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abstract class BaseOperation<Data, Error> extends ChangeNotifier {
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/// The number of times the query should refetch in the time of error
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/// before giving up
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final int retries;
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final Duration retryDelay;
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// got from global options
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@protected
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Duration cacheTime;
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// all properties
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Data? data;
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Error? error;
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/// total count of how many times the query retried to get a successful
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/// result
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int retryAttempts = 0;
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DateTime updatedAt;
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bool fetched = false;
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/// used for keeping track of query activity. If the are no mounts &
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/// the passed cached time is over than the query is removed from
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/// storage/cache
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Set<ValueKey<String>> _mounts = {};
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final QueryBowl queryBowl;
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BaseOperation({
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required this.cacheTime,
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required this.retries,
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required this.retryDelay,
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required this.queryBowl,
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this.data,
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}) : updatedAt = DateTime.now();
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void mount(ValueKey<String> uKey) {
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_mounts.add(uKey);
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}
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void unmount(ValueKey<String> uKey) {
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if (_mounts.length == 1) {
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Future.delayed(cacheTime, () {
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_mounts.remove(uKey);
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// for letting know QueryBowl that this one's time has come for
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// getting crushed
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notifyListeners();
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});
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} else {
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_mounts.remove(uKey);
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}
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}
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Set<ValueKey<String>> get mounts => _mounts;
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bool get isInactive => mounts.isEmpty;
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bool get hasData => data != null;
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bool get hasError => error != null;
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}
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