Method pre_start

websockets/echo/src/server.rs:84–92

(
        &self,
        myself: ActorRef<Self::Msg>,
        session: Self::Arguments,
    )

    type Arguments = actix_ws::Session;

    async fn pre_start(
        &self,
        myself: ActorRef<Self::Msg>,
        session: Self::Arguments,
    ) -> Result<Self::State, ActorProcessingErr> {
        myself.send_interval(HEARTBEAT_INTERVAL, || WsMessage::Hb);

        Ok((Instant::now(), session))
    }

    async fn handle(
        &self,