RouteMapCacheWarmer.php

<?php

namespace App\Cache;

use App\Service\RouteMapService;
use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;
use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\RouterInterface;

/**
 * Class RouteMapCacheWarmer.
 */
class RouteMapCacheWarmer implements CacheWarmerInterface
{
    private RouteCollection $routeCollection;

    public function __construct(RouterInterface $router)
    {
        $this->routeCollection = $router->getRouteCollection();
    }

    public function warmUp($cacheDirectory): array
    {
        $map = [];

        foreach ($this->routeCollection as $name => $route) {
            $map[$name] = $route->getPath();
        }

        $map = var_export($map, true);

        $map = <<<EOF
<?php

// This file was generated by running cache:warmup"

return $map;

EOF;
        file_put_contents($cacheDirectory.'/'.RouteMapService::ROUTE_MAP_FILENAME, $map, LOCK_EX);

        return [];
    }

    public function isOptional(): bool
    {
        return false;
    }
}

RouteMapService.php

<?php

namespace App\Service;

use Symfony\Component\HttpKernel\KernelInterface;

/**
 * Class RouteMapService.
 */
class RouteMapService
{
    const ROUTE_MAP_FILENAME = 'route_map.php';

    private array $routeMap;

    public function __construct(KernelInterface $kernel)
    {
        $this->routeMap = require_once $kernel->getCacheDir().'/'.static::ROUTE_MAP_FILENAME;
    }

    public function get(string $name): ?string
    {
        return $this->routeMap[$name] ?? null;
    }
}

services.yaml

services:
    App\Cache\RouteMapCacheWarmer:
        tags:
            - { name: kernel.cache_warmer, priority: 0 }