Hi,
In this article I’ll talk about Scheduled Task Manager in a ASP.NET Environment. We often need to make scheduled tasks running in background but it’s not very simple to make it with ASP.NET.
I based my article on the StackOverFlow article which uses ASP.NET Cache to schedule tasks.
First of all here is the IScheduledTask Interface in order to Implements our Custom Tasks
public interface IScheduledTask
{
TimeSpan Expiration { get; set; }
Boolean IsOnce { get; set; }
String Name { get; set; }
void Run();
}
Now the ScheduledTaskManager
public class ScheduledTaskManager
{
#region Singleton
static readonly ScheduledTaskManager instance = new ScheduledTaskManager();
static ScheduledTaskManager()
{
}
ScheduledTaskManager()
{
}
public static ScheduledTaskManager Instance
{
get
{
return instance;
}
}
#endregion
#region Private Fields
private static CacheItemRemovedCallback OnCacheRemove = null;
#endregion
#region Public Methods
public void AddTask(IScheduledTask task)
{
OnCacheRemove = new CacheItemRemovedCallback(CacheItemRemoved);
HttpRuntime.Cache.Insert(task.Name, task, null,
DateTime.Now.Add(task.Expiration), Cache.NoSlidingExpiration,
CacheItemPriority.NotRemovable, OnCacheRemove);
}
#endregion
#region Private Methods
private void CacheItemRemoved(string k, object v, CacheItemRemovedReason r)
{
var task = v as IScheduledTask;
if (task == null) return;
task.Run();
if (!task.IsOnce)
AddTask((IScheduledTask)v);
}
#endregion
}
We can now implement our Custom Task
public class MyTask : IScheduledTask
{
#region IScheduledTask Members
public TimeSpan Expiration
{
get; set;
}
public string Name
{
get; set;
}
public void Run()
{
Debug.WriteLine("Running !");
}
public bool IsOnce
{
get; set;
}
#endregion
}
Sample Usage :
public class Global : System.Web.HttpApplication
{
protected void Application_Start(object sender, EventArgs e)
{
var task = new MyTask {Name = "MyTask", Expiration = new TimeSpan(0, 0, 10)};
ScheduledTaskManager.Instance.AddTask(task);
var task2 = new MyTask { Name = "MyTask2", Expiration = new TimeSpan(0, 0, 5) };
ScheduledTaskManager.Instance.AddTask(task2);
}
}
Simple :)
Hope this help’s !
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