You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: support.rs
    path of file: ./repos/mmb/exchanges/interactive_brokers/src
    
    the code of the file until where you have to start completion: use crate::event_listener_fields::EventListenerFields;
use crate::interactive_brokers::InteractiveBrokers;
use anyhow::Result;
use async_trait::async_trait;
use dashmap::DashMap;
use function_name::named;
use futures::executor::block_on;
use mmb_core::connectivity::WebSocketRole;
use mmb_core::exchanges::general::exchange::Exchange;
use mmb_core::exchanges::traits::{
    HandleMetricsCb, HandleOrderFilledCb, HandleTradeCb, OrderCancelledCb, OrderCreatedCb,
    SendWebsocketMessageCb, Support,
};
use mmb_core::infrastructure::spawn_future_standalone;
use mmb_core::settings::ExchangeSettings;
use mmb_domain::market::{CurrencyCode, CurrencyId, CurrencyPair, SpecificCurrencyPair};
use mmb_utils::infrastructure::SpawnFutureFlags;
use std::any::Any;
use std::sync::Arc;
use url::Url;

#[async_trait]
impl Support for InteractiveBrokers {
    fn
    
    fn set_handle_order_filled_callback(&mut self, callback: HandleOrderFilledCb) {
        let f_n = function_name!();

        let mut event_listener_fields = block_on(self.event_listener_fields.write());

        let event_listener_fields = event_listener_fields
            .as_mut()
            .unwrap_or_else(|| panic!("fn {f_n}: `event_listener_fields` is `None`."));

        event_listener_fields.handlers.order_filled_callback = callback;
    }

    fn set_handle_trade_callback(&mut self, _callback: HandleTradeCb) {
        todo!()
    }

    fn set_handle_metrics_callback(&mut self, _callback: HandleMetricsCb) {
        todo!()
    }

    fn set_traded_specific_currencies(&self, _currencies: Vec<SpecificCurrencyPair>) {
        todo!()
    }

    fn is_websocket_enabled(&self, _role: WebSocketRole) -> bool {
        false
    }

    async fn create_ws_url(&self, _role: WebSocketRole) -> Result<Url> {
        todo!()
    }

    fn get_specific_currency_pair(&self, _currency_pair: CurrencyPair) -> SpecificCurrencyPair {
        todo!()
    }

    fn get_supported_currencies(&self) -> &DashMap<CurrencyId, CurrencyCode> {
        todo!()
    }

    fn should_log_message(&self, _message: &str) -> bool {
        todo!()
    }

    fn get_settings(&self) -> &ExchangeSettings {
        todo!()
    }
}