Scheduler Background Service Scope Injection
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using System; | |
using System.Threading; | |
using System.Threading.Tasks; | |
using Cronos; | |
using Microsoft.Extensions.DependencyInjection; | |
using Microsoft.Extensions.Hosting; | |
using Microsoft.Extensions.Logging; | |
namespace SchedulerJobSample.Worker | |
{ | |
public class SchedulerService : BackgroundService | |
{ | |
private readonly ILogger<SchedulerService> _logger; | |
private readonly IServiceProvider _serviceProvider; | |
public SchedulerService(ILogger<SchedulerService> logger, IServiceProvider serviceProvider) | |
{ | |
_logger = logger; | |
_serviceProvider = serviceProvider; | |
} | |
protected override async Task ExecuteAsync(CancellationToken stoppingToken) | |
{ | |
while (!stoppingToken.IsCancellationRequested) | |
{ | |
// Schedule the job every minute. | |
await WaitForNextSchedule("* * * * *"); | |
using var scope = _serviceProvider.CreateScope(); | |
var scopedSchedulerService = scope.ServiceProvider.GetRequiredService<IScopedSchedulerService>(); | |
await scopedSchedulerService.ExecuteAsync(stoppingToken); | |
} | |
} | |
private async Task WaitForNextSchedule(string cronExpression) | |
{ | |
var parsedExp = CronExpression.Parse(cronExpression); | |
var currentUtcTime = DateTimeOffset.UtcNow.UtcDateTime; | |
var occurenceTime = parsedExp.GetNextOccurrence(currentUtcTime); | |
var delay = occurenceTime.GetValueOrDefault() - currentUtcTime; | |
_logger.LogInformation("The run is delayed for {delay}. Current time: {time}", delay, DateTimeOffset.Now); | |
await Task.Delay(delay); | |
} | |
} | |
} |
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