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switch from timestamps to event sequence for events

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This commit is contained in:
Fabian Freund
2026-02-10 16:20:35 +01:00
parent e0cce93ffb
commit 592c6afdc5
30 changed files with 840 additions and 254 deletions
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packages/flutter_mozilla_components/lib/src/extensions/subject.dart
+18 -6
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@@ -9,17 +9,29 @@ import 'package:rxdart/rxdart.dart';
final _lastEventTimes = <Subject, Map<dynamic, int>>{};
extension SubjectAddRecent<T> on Subject<T> {
void addWhenMoreRecent(int timestamp, dynamic identifier, T value) {
/// Adds [value] to this Subject only if [sequence] is greater than
/// the last sequence number for this [identifier].
///
/// Uses atomic event sequence numbers (from native EventSequence) to ensure
/// events are processed in order and prevent out-of-order updates.
/// Sequence numbers are monotonically increasing integers (0, 1, 2, ...).
void addWhenMoreRecent(int sequence, dynamic identifier, T value) {
_lastEventTimes[this] ??= {};
if ((_lastEventTimes[this]?[identifier] ?? 0) < timestamp) {
_lastEventTimes[this]![identifier] = timestamp;
if ((_lastEventTimes[this]?[identifier] ?? 0) < sequence) {
_lastEventTimes[this]![identifier] = sequence;
add(value);
}
}
/// Updates this BehaviorSubject only if [sequence] is greater than
/// the last sequence number for this [identifier].
///
/// Uses atomic event sequence numbers (from native EventSequence) to ensure
/// events are processed in order and prevent out-of-order updates.
/// Sequence numbers are monotonically increasing integers (0, 1, 2, ...).
void updateWhenMoreRecent(
int timestamp,
int sequence,
dynamic identifier,
T Function(T? currentValue) update,
) {
@@ -27,8 +39,8 @@ extension SubjectAddRecent<T> on Subject<T> {
_lastEventTimes[this] ??= {};
if ((_lastEventTimes[this]?[identifier] ?? 0) < timestamp) {
_lastEventTimes[this]![identifier] = timestamp;
if ((_lastEventTimes[this]?[identifier] ?? 0) < sequence) {
_lastEventTimes[this]![identifier] = sequence;
add(update((this as BehaviorSubject<T>).valueOrNull));
}
}