fix issue #386 add experimental reload feature

.gitignore

@@ -35,3 +35,6 @@ test_out
 
 # local overrides
 pubspec_overrides.yaml
+# tmp root project to workaround analyze issue in 3.5
+/pubspec.yaml
+/pubspec.lock

sembast/lib/src/api/record_snapshot.dart

@@ -21,3 +21,16 @@ abstract class RecordSnapshot<K extends Key?, V extends Value?> {
   /// Cast if needed
   RecordSnapshot<RK, RV> cast<RK extends Key?, RV extends Value?>();
 }
+
+/// Extension on iterable of record snapshot
+extension RecordSnapshotIterableExtension<K extends Key?, V extends Value?>
+    on Iterable<RecordSnapshot<K, V>> {
+  /// Keys
+  Iterable<K> get keys => map((e) => e.key);
+
+  /// Values
+  Iterable<V> get values => map((e) => e.value);
+
+  /// Key value pairs
+  Iterable<(K, V)> get keysAndValues => map((e) => (e.key, e.value));
+}

sembast/lib/src/api/sembast.dart

@@ -10,7 +10,8 @@ export 'package:sembast/src/api/finder.dart';
 export 'package:sembast/src/api/query_ref.dart';
 export 'package:sembast/src/api/record_ref.dart' show RecordRef;
 export 'package:sembast/src/type.dart' show RecordKeyBase, RecordValueBase;
-export 'package:sembast/src/api/record_snapshot.dart';
+export 'package:sembast/src/api/record_snapshot.dart'
+    show RecordSnapshot, RecordSnapshotIterableExtension;
 export 'package:sembast/src/api/records_ref.dart';
 export 'package:sembast/src/api/sort_order.dart';
 export 'package:sembast/src/api/store_ref.dart';

sembast/lib/src/api/v2/database.dart

@@ -42,4 +42,18 @@ extension DatabaseExtension on Database {
   /// On sembast_web and sembast_sqflite, data will be
   /// read again (incrementally or not) to handle external changes.
   Future<void> checkForChanges() => (this as SembastDatabase).checkForChanges();
+
+  /// Warning: unsafe.
+  ///
+  /// On sembast io, the file will be reloaded. Unpredictable behavior if a write
+  /// happens at the same time. The database is closed and re-opened.
+  /// So any pending listeners are lost.
+  Future<void> reOpen() => (this as SembastDatabase).reOpen();
+
+  /// Warning: unsafe.
+  ///
+  /// On sembast io, the file will be reloaded. Unpredictable behavior if a write
+  /// happens at the same time. The database if not closed and existing listeners
+  /// remain.
+  Future<void> reload() => (this as SembastDatabase).reload();
 }