DD.WellWorkover.Cloud/AsbCloudInfrastructure/Background/PeriodicBackgroundWorker.cs

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using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace AsbCloudInfrastructure.Background;
/// <summary>
/// Сервис для фонового выполнения периодической работы
/// </summary>
public class PeriodicBackgroundWorker : BackgroundService
{
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private readonly TimeSpan executePeriod = TimeSpan.FromSeconds(10);
private readonly TimeSpan minDelay = TimeSpan.FromSeconds(1);
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private readonly IServiceProvider serviceProvider;
private readonly List<WorkPeriodic> works = new(8);
/// <summary>
/// Список периодических работ
/// </summary>
public IEnumerable<WorkPeriodic> Works => works;
/// <summary>
/// Работа выполняемая в данный момент
/// </summary>
public Work? CurrentWork;
/// <summary>
/// Ошибка в главном цикле, никогда не должна появляться
/// </summary>
public string MainLoopLastException { get; private set; } = string.Empty;
public PeriodicBackgroundWorker(IServiceProvider serviceProvider)
{
this.serviceProvider = serviceProvider;
}
protected override async Task ExecuteAsync(CancellationToken token)
{
Trace.TraceInformation($"{GetType().Name} started");
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while (!token.IsCancellationRequested)
{
try
{
var periodicWork = GetNext();
if (periodicWork is null)
{
await Task.Delay(executePeriod, token);
continue;
}
CurrentWork = periodicWork.Work;
using var scope = serviceProvider.CreateScope();
var result = await periodicWork.Work.Start(scope.ServiceProvider, token);
CurrentWork = null;
await Task.Delay(minDelay, token);
}
catch (Exception ex)
{
MainLoopLastException = $"BackgroundWorker " +
$"MainLoopLastException: \r\n" +
$"date: {DateTime.Now:O}\r\n" +
$"message: {ex.Message}\r\n" +
$"inner: {ex.InnerException?.Message}\r\n" +
$"stackTrace: {ex.StackTrace}";
Trace.TraceError(MainLoopLastException);
}
}
}
/// <summary>
/// Добавить фоновую работу выполняющуюся с заданным периодом
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="period"></param>
public void Add<T>(TimeSpan period)
where T : Work, new()
{
var work = new T();
var periodic = new WorkPeriodic(work, period);
works.Add(periodic);
}
/// <summary>
/// Добавить фоновую работу выполняющуюся с заданным периодом
/// </summary>
/// <param name="work"></param>
/// <param name="period"></param>
public void Add(Work work, TimeSpan period)
{
var periodic = new WorkPeriodic(work, period);
works.Add(periodic);
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if (ExecuteTask is null || ExecuteTask.IsCompleted)
StartAsync(CancellationToken.None).Wait();
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}
private WorkPeriodic? GetNext()
{
var work = works
.OrderBy(w => w.NextStart)
.FirstOrDefault();
if (work is null || work.NextStart > DateTime.Now)
return null;
return work;
}
}