Initial flame_lua_runtime package

lib/runtime/events/runtime_event_gate.dart

@@ -0,0 +1,47 @@
+import '../lifecycle/runtime_session.dart';
+import '../models/runtime_event.dart';
+
+class RuntimeEventGate {
+  const RuntimeEventGate({
+    required this.session,
+    required bool Function(String id) isScopeAlive,
+    bool Function(String id, int epoch)? isNodeEpochAlive,
+  }) : _isScopeAlive = isScopeAlive,
+       _isNodeEpochAlive = isNodeEpochAlive;
+
+  final RuntimeSession session;
+  final bool Function(String id) _isScopeAlive;
+  final bool Function(String id, int epoch)? _isNodeEpochAlive;
+
+  RuntimeEvent attachSession(RuntimeEvent event) {
+    return event.withLifecycle(sessionId: event.sessionId ?? session.id);
+  }
+
+  bool accepts(RuntimeEvent event) {
+    final eventSessionId = event.sessionId;
+    if (eventSessionId != null && !session.accepts(eventSessionId)) {
+      return false;
+    }
+
+    final target = event.target;
+    final targetEpoch = event.targetEpoch;
+    final epochChecker = _isNodeEpochAlive;
+    if (target != null && targetEpoch != null && epochChecker != null) {
+      if (!epochChecker(target, targetEpoch)) {
+        return false;
+      }
+    }
+
+    final scope = event.scope;
+    if (scope != null && !_isScopeAlive(scope)) {
+      return false;
+    }
+    final scopeEpoch = event.scopeEpoch;
+    if (scope != null && scopeEpoch != null && epochChecker != null) {
+      if (!epochChecker(scope, scopeEpoch)) {
+        return false;
+      }
+    }
+    return true;
+  }
+}