hotline/src/Hotline.Application/Bigscreen/BigscreenDataShowRefreshService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Hotline.Realtimes;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace Hotline.Application.Bigscreen
{
    public class BigscreenDataShowRefreshService : BackgroundService
    {
        private readonly IServiceScopeFactory _serviceScopeFactory;

        public BigscreenDataShowRefreshService(IServiceScopeFactory serviceScopeFactory)
        {
            _serviceScopeFactory = serviceScopeFactory;
        }

        /// <summary>
        /// This method is called when the <see cref="T:Microsoft.Extensions.Hosting.IHostedService" /> starts. The implementation should return a task that represents
        /// the lifetime of the long running operation(s) being performed.
        /// </summary>
        /// <param name="stoppingToken">Triggered when <see cref="M:Microsoft.Extensions.Hosting.IHostedService.StopAsync(System.Threading.CancellationToken)" /> is called.</param>
        /// <returns>A <see cref="T:System.Threading.Tasks.Task" /> that represents the long running operations.</returns>
        /// <remarks>See <see href="https://docs.microsoft.com/dotnet/core/extensions/workers">Worker Services in .NET</see> for implementation guidelines.</remarks>
        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            using var scope = _serviceScopeFactory.CreateScope();
            var realtimeService = scope.ServiceProvider.GetRequiredService<IRealtimeService>();

            while (!stoppingToken.IsCancellationRequested)
            {
                //todo
                var data = new {
                    Name = "John",
                    Age = 20,
                };

                await realtimeService.BsDataShowChangedAsync(data, stoppingToken);

                await Task.Delay(30000, stoppingToken);
            }
        }
    }
}