on
Handles the join event of a room member.
Parameters
username
The username of the member.
session
The session ID of the WebSocket connection.
socket
The WebSocket session.
Throws
if a member with the same username already exists.
Handles the join event of a room member.
The username of the member.
The session ID of the WebSocket connection.
The WebSocket session.
if a member with the same username already exists.