Initial Usage of Cache Model in a controller

HomeController.php

<?php
namespace App/Controllers;

use App/models/CacheModel as Cache;

Class HomeController
{
    private $cache;
    
    public function __construct()
    {
        $this->cache = new Cache();
    }
    
    public function index()
    {
        $key_name = __CLASS__.'_'.__METHOD__;
        $html = $this->cache->get($key_name);
        if (! empty($html)) {
            echo $html;
            exit();
        }

        // data processing
        // ..
        // some more processing
        // ..
        // some more..

        // rendering the html view after data processing
        $html = '<h1>My HTML Template/Page to output</H1>';

        $seconds_in_day = 60 * 60 * 24;
        $this->cache->set($key_name, $html, $seconds_in_day);

        echo $html;
        exit();
    }
}