Initial commit

2026-07-14 11:11:36 +08:00
commit 656499cf94
604 changed files with 119518 additions and 0 deletions
@@ -0,0 +1,77 @@
+import 'dart:async';
+
+
+class RelinkScheduler {
+  RelinkScheduler({
+    this.maxAttempts = 3,
+    this.backoffs = const [
+      Duration.zero,
+      Duration(seconds: 2),
+      Duration(seconds: 5),
+    ],
+  }) : assert(maxAttempts > 0),
+       assert(backoffs.isNotEmpty);
+
+  final int maxAttempts;
+  final List<Duration> backoffs;
+
+  int _attempts = 0;
+  bool _pending = false;
+  Timer? _backoffTimer;
+  Timer? _sustainTimer;
+
+
+  bool get pending => _pending;
+
+
+  int get attempts => _attempts;
+
+
+  bool schedule({
+    required void Function(Duration delay) onRelink,
+    required void Function() onGiveUp,
+  }) {
+    if (_pending) return false;
+
+
+    _sustainTimer?.cancel();
+
+    if (_attempts >= maxAttempts) {
+      onGiveUp();
+      return false;
+    }
+    final backoffIndex = _attempts.clamp(0, backoffs.length - 1);
+    final delay = backoffs[backoffIndex];
+    _attempts++;
+
+    _pending = true;
+    _backoffTimer?.cancel();
+    _backoffTimer = Timer(delay, () {
+      _pending = false;
+      onRelink(delay);
+    });
+    return true;
+  }
+
+
+  void armSustain({Duration sustain = const Duration(seconds: 30)}) {
+    _sustainTimer?.cancel();
+    _sustainTimer = Timer(sustain, () => _attempts = 0);
+  }
+
+
+  void cancelPending() {
+    _backoffTimer?.cancel();
+    _pending = false;
+  }
+
+
+  void reset() => _attempts = 0;
+
+
+  void dispose() {
+    _backoffTimer?.cancel();
+    _sustainTimer?.cancel();
+    _pending = false;
+  }
+}