9/8/2023 0 Comments Net core cron job![]() ![]() The proposed solution may not even be a good approach to this type of problem. ![]() There are better approaches to doing that type of work. But do remember: this is not a proper scheduler for complicated background tasks. Give it a try! The sample code is available here. This is normally done by setting TaskScheduler.UnobservedTaskException, but I found that too global for this case so added my own to specifically catch scheduled tasks unhandled exceptions. If we have an unhandled exception in there, we won’t see a thing… Which is why we may want to be able to do some logging. In our scheduler code, we’ve used TaskFactory.StartNew() to run our task’s code. As you can see, it takes a delegate that handles unobserved exceptions. Maybe one little word about the AddScheduler above. If we now start our application, it should fetch the quote of the day every 6 hours and make it available for any other part of my application to work with. Public class SchedulerHostedService : HostedService ![]() First of all, I want all of the scheduled tasks to look like this: Since ASP.NET Core is heavily built around composition and dependency injection, let’s put that to use. So now you know how to use IHostedService in ASP.NET Core 2.0, it’s time to build our scheduler. Well, Spring approach actually - except for the fun in writing code (we never heard that joke before -)) the above sample will work in pretty much any Spring application.īefore we dive in, please read Steve’s post about using IHostedService in ASP.NET Core 2.0. So I thought of working on a system that would be more similar to the Kotlin approach above. Yes, it’s a more powerful way of handling this type of background work, but look at that Kotlin sample above! It’s short, simple, clean. Then earlier this week, I saw Steve Gordon blogged about using IHostedService in ASP.NET Core 2.0, and I noticed this was potentially the same. We have a few other occasions, but they all share one pattern: a simple background fetch of data, moving it outside of the request path. Twice a day, we fetch the list of employees for some other functionality. This same approach is taken in various other places of the application. We just tell our application to refresh the list of releases every two hours, without having to do this in a request path. While those approaches all work, they are all more complex than what we see in the above code sample. NET which is either coming up with our own scheduling system, or coming up with a crazy approach that uses timestamps, or use ObjectCache and check whether data expired or not. In this example, our bot uses the releasesList to return data about upcoming product releases when someone asks on Slack.įor this case, I kind of like the approach of being able to populate a list of data every 2 hours (or whetever the cron string dictates), instead of doing what we typically do in. Turns out that the attribute is part of the Spring framework and allows simple scheduling of background tasks. Wondering what it did, I asked around and did some research. ![]()
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