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: update_handler.rs
    path of file: ./repos/el_monitorro/src/bot
    
    the code of the file until where you have to start completion: use super::commands::CommandProcessor;
use crate::bot::telegram_client;
use crate::config::Config;
use frankenstein::MaybeInaccessibleMessage;
use frankenstein::Update;
use frankenstein::UpdateContent;
use std::thread;

pub struct UpdateHandler {}

impl UpdateHandler {
    pub fn start() {
        let mut api = telegram_client::api().clone();
        let thread_pool = rayon::ThreadPoolBuilder::new()
            .num_threads(Config::commands_db_pool_number() as usize)
            .build()
            .unwrap();

        log::info!("Starting the El Monit
    
    fn process_callback_query(update: Update) {
        let query = match update.content {
            UpdateContent::CallbackQuery(callback_query) => callback_query,
            _ => return,
        };

        let text = query.data.clone();

        if text.is_none() || query.message.is_none() {
            return;
        }

        if let MaybeInaccessibleMessage::Message(message) = query.message.unwrap() {
            CommandProcessor::builder()
                .message(message)
                .text(text.unwrap())
                .callback(true)
                .build()
                .process();
        }
    }