servicepoint-tanks/TanksServer/GameTickService.cs

using System.Threading;
using Microsoft.Extensions.Hosting;

namespace TanksServer;

public class GameTickService(IEnumerable<ITickStep> steps) : IHostedService
{
    private readonly CancellationTokenSource _cancellation = new();
    private readonly List<ITickStep> _steps = steps.ToList();
    private Task? _run;

    public Task StartAsync(CancellationToken cancellationToken)
    {
        _run = RunAsync();
        return Task.CompletedTask;
    }

    private async Task RunAsync()
    {
        while (!_cancellation.IsCancellationRequested)
        {
            foreach (var step in _steps)
                await step.TickAsync();
            await Task.Delay(1000);
        }
    }

    public async Task StopAsync(CancellationToken cancellationToken)
    {
        await _cancellation.CancelAsync();
        if (_run != null) await _run;
    }
}

public interface ITickStep
{
    Task TickAsync();
}