9swampy / FluentScheduler

A task scheduler that uses fluent interface to configure schedules. Useful for running cron jobs/automated tasks from your application.

FluentScheduler

Task scheduler with fluent interface that runs automated tasks (cron jobs) from your application.

Usage

All task configuration is handled in a Registry class. You can use classes that implement ITask or express your task as an Action.

using FluentScheduler;

public class MyRegistry : Registry
{
    public MyRegistry()
    {
        // Schedule an ITask to run at an interval
        Schedule<MyTask>().ToRunNow().AndEvery(2).Seconds();

        // Schedule an ITask to run once, delayed by a specific time interval
        Schedule<MyTask>().ToRunOnceIn(5).Seconds();

        // Schedule a simple task to run at a specific time
        Schedule(() => Console.WriteLine("Timed Task - Will run every day at 9:15pm: " + DateTime.Now))
            .ToRunEvery(1).Days().At(21, 15);

        // Schedule a more complex action to run immediately and on an monthly interval
        Schedule(() =>
        {
            Console.WriteLine("Complex Action Task Starts: " + DateTime.Now);
            Thread.Sleep(1000);
            Console.WriteLine("Complex Action Task Ends: " + DateTime.Now);
        }).ToRunNow().AndEvery(1).Months().OnTheFirst(DayOfWeek.Monday).At(3, 0);
        
        //Schedule multiple tasks to be run in a single schedule
        Schedule<MyTask>().AndThen<MyOtherTask>().ToRunNow().AndEvery(5).Minutes();
    }
} 

You then need to initialize the TaskManager. This is usually done in the Application_Start method of a web application or when your application is being loaded:

protected void Application_Start()
{
    TaskManager.Initialize(new MyRegistry()); 
} 

Dependency Injection

FluentScheduler makes it easy to use your IoC tool of choice to create task instances. Simply implement ITaskFactory.

An example incorporating StructureMap:

using FluentScheduler;
using StructureMap;

public class StructureMapTaskFactory : ITaskFactory
{
    public ITask GetTaskInstance<T>() where T : ITask
    {
        return ObjectFactory.Container.GetInstance<T>();
    }
}

public class MyRegistry : Registry
{
    public MyRegistry()
    {
        // Schedule an ITask to run at an interval
        Schedule<MyTask>().ToRunNow().AndEvery(2).Seconds();
    }
} 

Register the new task factory with the TaskManager:

protected void Application_Start()
{
    TaskManager.TaskFactory = new StructureMapTaskFactory();
    TaskManager.Initialize(new MyRegistry()); 
}

Unexpected exceptions

To observe unhandled exceptions from your scheduled tasks, you will need to hook the UnobservedTaskException event on TaskManager. That event will give you access to the underlying System.Threading.Tasks.Task and thrown exception details.

protected void Application_Start()
{
    TaskManager.UnobservedTaskException += TaskManager_UnobservedTaskException;
    TaskManager.Initialize(new TaskRegistry());
}

static void TaskManager_UnobservedTaskException(Task sender, UnhandledExceptionEventArgs e)
{
    Log.Fatal("An error happened with a scheduled task: " + e.ExceptionObject);
}

Contributing

Feel free to open an issue or submit a pull request.

When sending a patch remember to Run All Tests (Ctrl + R, A) and Run Code Analysis on Solution (Alt + F11) if possible. And, of course, be consistent with the existing code!