# v2-p2-async-bridge

## Goal
Bridge synchronous EventEmitter to asyncio so DiscussionEngine can run in a thread while WebSocket/SSE consumers receive events asynchronously.

## Key files
- `meeting_room/events.py` — add AsyncEventBridge class
- `meeting_room/engine.py` — no changes (runs in thread as-is)

## Decisions log
- 2026-05-04: AsyncEventBridge + asyncio.to_thread() chosen over async engine rewrite. Minimizes changes, engine stays sync.

## Open questions
- [ ] None

## Completed steps
- [x] AsyncEventBridge class in events.py
- [x] Thread-safe bridge with call_soon_threadsafe
- [x] subscribe/unsubscribe consumer queues
- [x] Drop policy on full queues
- [x] Tests (10/10 passing)

## Notes
- events.py already has comment: "In Phase 2, an AsyncEventBridge will forward events to WebSocket clients"
- Bridge subscribes to sync EventEmitter, puts events into asyncio.Queue
- Consumers (WebSocket handlers, SSE handlers) read from the queue