BirthdayBot/BackgroundServices/BackgroundService.cs

using System.Threading;
using System.Threading.Tasks;

namespace BirthdayBot.BackgroundServices
{
    abstract class BackgroundService
    {
        protected ShardInstance ShardInstance { get; }

        public BackgroundService(ShardInstance instance) => ShardInstance = instance;

        protected void Log(string message) => ShardInstance.Log(GetType().Name, message);

        public abstract Task OnTick(CancellationToken token);
    }
}