flutter-bloc-stream-tracking

To handle real-time websocket streams in a Flutter Bloc without leaking subscriptions, use emit.forEach inside an event handler. This ties the stream subscription lifetime directly to the handler and Bloc close lifecycle, preventing memory leaks and confusing state transitions.

The best way to manage connection states for live tracking in Flutter is defining explicit state variants. Separate your connection lifecycle into Connecting, Connected, Reconnecting, Disconnected, and a terminal Closed state to ensure UI correctness during server-pushed event streams.

To safely disconnect a WebSocket stream from a Flutter Bloc, close the upstream stream via the Repository. The Repository should own the transport and stream lifetime, stopping tracking cleanly rather than trying to terminate another handler’s work directly.

Retry and backoff logic for a Flutter real-time chat application belongs in the Repository. The Repository owns transport and reconnection details, keeping the Bloc focused purely on state flow while the Repository handles complex retry mechanisms.

Duplicate state updates during reconnection often happen when stream subscriptions are not tied to the handler lifecycle. Using emit.forEach within a restartable ConnectRequested handler ensures the previous subscription is properly canceled before starting a new one.