Event-Driven Architecture in the Clouds with Windows Azure

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading;
using Microsoft.WindowsAzure.Diagnostics;
using Microsoft.WindowsAzure.ServiceRuntime;
using FlightUpdates.Utility.Constants;
using FlightUpdates.MessageProcessorService.Resource_Files;

namespace FlightUpdates.MessageProcessorService
{
    public class WorkerRole : RoleEntryPoint
    {
        public override void Run()
        {
            try
            {
                Trace.Listeners.Add(new TraceWriterUtil());
                Trace.WriteLine(Messages.ServiceStart);
                FlightDelayQueueProcessor flightDelayQueueProcessor = new FlightDelayQueueProcessor();

                while (true)
                {
                    //Process messages
                    Trace.WriteLine(Messages.ProcessingMessageFromQueue);
                    flightDelayQueueProcessor.ProcessFlightDelayMessagesFromQueue();

                    //Nap time
                    Trace.WriteLine(Messages.NapTime + TwitterSettings.runProccessingInterMin);
                    Thread.Sleep(TimeSpan.FromMinutes(TwitterSettings.runProccessingInterMin));

                }
            }           
            catch (Exception err)
            {
                Trace.WriteLine(err.ToString(), LogMessageTypes.Error);
                throw (err);
            }
        }

        public override bool OnStart()
        {
            // Set the maximum number of concurrent connections 
            ServicePointManager.DefaultConnectionLimit = 1;

            //DiagnosticMonitor.Start("DiagnosticsConnectionString");

            // For information on handling configuration changes
            // see the MSDN topic at http://go.microsoft.com/fwlink/?LinkId=166357.
            RoleEnvironment.Changing += RoleEnvironmentChanging;

            return base.OnStart();
        }

        private void RoleEnvironmentChanging(object sender, RoleEnvironmentChangingEventArgs e)
        {
            // If a configuration setting is changing
            if (e.Changes.Any(change => change is RoleEnvironmentConfigurationSettingChange))
            {
                // Set e.Cancel to true to restart this role instance
                e.Cancel = true;
            }
        }
    }
}