Quartz.Net Jobs in Azure WebRole

Question

I'm currently porting a WCF Service Project over to an Azure Role. Until now the library containing the service also hosted a Quartz.Net JobFactory for some lightweight background processing (perdiodically cleaning up stale email confirmation tokens). Do I have to move that code into a seperate worker role?

Precursory

Answer 1

No you don't have to setup a separate worker role.

You simply have to start a background thread in your OnStart() Method of your Web Role. Give that thread a Timer object that executes your method after the given timespan.

Due to this you can avoid a new worker role.

class MyWorkerThread 
{
    private Timer timer { get; set; }
    public ManualResetEvent WaitHandle { get; private set; }

    private void DoWork(object state)
    {
        // Do something
    }

    public void Start()
    {
        // Execute the timer every 60 minutes
        WaitHandle = new ManualResetEvent(false);
        timer = new Timer(DoWork, null, TimeSpan.Zero, TimeSpan.FromMinutes(60));

        // Wait for the end 
        WaitHandle.WaitOne();
    }
}

class WebRole : RoleEntryPoint
{
    private MyWorkerThread workerThread;

    public void OnStart()
    {
        workerThread = new MyWorkerThread();
        Thread thread = new Thread(workerThread.Start);
        thread.Start();
    }

    public void OnEnd()
    {
        // End the thread
        workerThread.WaitHandle.Set();
    }
}

Talipes

Will timer event execute even if no access to web site happened in say one hour? I know IIS can shutdown inactive sites, but I have no idea on how Azure behaves in such circumstances. – Tweedsmuir

Answer 2

The answer above helped me a lot, but it has one hickup, the OnStart method is not overwritten so the method is never called. Also it should be Boolean and not void. This worked for me:

public override bool OnStart()
{
    // For information on handling configuration changes
    // see the MSDN topic at http://go.microsoft.com/fwlink/?LinkId=166357.

    workerThread = new MyWorkerThread();
    Thread thread = new Thread(workerThread.Start);
    thread.Start();

    return base.OnStart();
}

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