RtmtServer ports the WebSocket protocol (auth handshake, sockets per
user, ping) and runs on the game loop; the websockets-next endpoint at /
only forwards socket events. The HTTP routes, CORS and the access log
match the Express app. Backend wires everything and restores live games
before handling socket events. End-to-end tests play games over real
sockets against Postgres and Valkey.
GameManager, matchmaking, the game clock, live game snapshots, saving
finished games and live previews, ported from the Node backend with its
tests. Snapshots keep the Node backend's format; a test restores one the
Node backend wrote. Valkey writes and saves run off the game loop.
Quarkus 3.40 on Java 25, built with the Maven wrapper. The engine is a
line-by-line port of packages/mancala.js; a parity test replays games
recorded with the TypeScript engine, including illegal moves, and
compares every board, turn, error and the game JSON.
