Hangfire for background tasks

Are you ready?

what it is

Incredibly easy way to perform fire-and-forget, delayed and recurring tasks inside ASP.NET applications. No Windows Service required. Easy to setup, easy to configure.

Hang fire

Pendure

Espere

Fogo

Dispare

Pendure dispare

http://hangfire.io

Really easy?

// Fire and forget tasks
BackgroundJob.Enqueue( () => Console.WriteLine("Simple!") );

// Delayed tasks
BackgroundJob.Schedule( () => Console.WriteLine("Reliable!"), TimeSpan.FromDays(7) );

// Recurring tasks
RecurringJob.AddOrUpdate( () => Console.WriteLine("Transparent!"), Cron.Daily);

Yes, pretty easy!

Cron

string comprising fields separated by white space that represents a set of times.

at 9:15am Fridays in every month.

...more on nuget

And more...

[AutomaticRetry(100, Attempts = 10]
public static void GenerateStatistics() { }

BackgroundJob.Enqueue(() => GenerateStatistics());

[Queue("critical")]
public void SomeMethod() { }

BackgroundJob.Enqueue(() => SomeMethod());

If fail, try again after 100ms

Queue in

critical list

ok, and the performance?

Scalable - Use multiple server instances
MSMQ or Redis to reduce the processing latency to minimum.
Degree of parallelism

app.UseHangfire(config => {
            config.UseSqlServerStorage("cn-name");
	    //OR: 
            // config.UseRedisStorage("127.0.0.1:6379", 0, 
            //     new RedisStorageOptions{ ConnectionPoolSize = 90 });
	    config.UseServer(5, "critical", "default");
	});

aham beautiful....

and how to test it?

public class HomeController : Controller
{
    public ActionResult Create(Comment comment)
    {
        ...
        BackgroundJob.Enqueue(() => CheckForSpam(comment.Id));
        ...
    }
}

Simple, mock it!

[TestMethod]
public void CheckForSpamJob_ShouldBeEnqueued()
{
    // Arrange
    var client = new Mock<IBackgroundJobClient>();
    var controller = new HomeController(client.Object);
    var comment = CreateComment();

    // Act
    controller.Create(comment);

    // Assert
    client.Verify(x => x.Create(
        It.Is<Job>(job => job.Method.Name == "CheckForSpam" && job.Arguments[0] == comment.Id),
        It.IsAny<EnqueuedState>());
}

public class HomeController(IBackgroundJobClient jobClient) : Controller
{
    public IBackgroundJobClient JobClient{ get; } = jobClient;

    public ActionResult Create(Comment comment)
    {
        ...
        _jobClient.Enqueue(() => CheckForSpam(comment.Id));
        ...
    }
}

http://bit.ly/1rk5xBo