Knocks/BackEnd/Knoks.Api/Logic/Managers/RefreshExchangesHostedService.cs

using Knoks.Core.Data.Interfaces;
using Knoks.Core.Entities;
using Knoks.Core.Logic.Interfaces;
using Microsoft.Extensions.Logging;
using System.Collections.Generic;
using System.Threading.Tasks;
using System.Linq;
using System;
using System.Collections.ObjectModel;
using Knoks.Api.Logic.Interfaces;
using Knoks.Api.Data.Interfaces;
using Knoks.Api.Entities;
using Microsoft.Extensions.Hosting;
using System.Threading;
using Knoks.Framework.Services;

namespace Knoks.Api.Logic.Managers
{
    public  class RefreshExchangesHostedService : IHostedService, IDisposable
    {
        private readonly ILogger _logger;
        private Timer _timer;
        private readonly IExchangeManager _exchangeManager;
        private readonly int _exchangesInfoUpdateHours;

        public RefreshExchangesHostedService(CommonSettings settings, ILogger<RefreshExchangesHostedService> logger, IExchangeManager exchangeManager)
        {
            _logger = logger;
            _exchangeManager = exchangeManager;
            _exchangesInfoUpdateHours = settings.ExchangesInfoUpdateHours;
        }

        public Task StartAsync(CancellationToken cancellationToken)
        {
            _logger.LogInformation($"{nameof(RefreshExchangesHostedService)} is starting.");

            _timer = new Timer(DoWork, null, TimeSpan.Zero,
                TimeSpan.FromHours(_exchangesInfoUpdateHours));

            return Task.CompletedTask;
        }

        private void DoWork(object state)
        {
            _exchangeManager.UpdateExchanges();
            _logger.LogInformation($"{nameof(RefreshExchangesHostedService)} is working.");
        }

        public Task StopAsync(CancellationToken cancellationToken)
        {
            _logger.LogInformation($"{nameof(RefreshExchangesHostedService)} is stopping.");
            _timer?.Change(Timeout.Infinite, 0);
            return Task.CompletedTask;
        }

        public void Dispose()
        {
            _timer?.Dispose();
        }
    }
}