/// <summary>
/// This is the eternal loop that will receive all requests and call <see cref="HandleRequest"/> for each.
/// If there is a problem, then it will retry, waiting longer and longer time between retries.
/// </summary>
public static void HandleRequests(string entityName, AdapterSubscription.RequestDelegate requestHandler)
{
AdapterSubscription subscription = null;
var sleepTime = 100;
while (true)
{
try
{
if (subscription == null)
{
subscription = new AdapterSubscription(clientName, entityName);
}
// Handle one request
subscription.HandleOne(requestHandler);
// Successful receive. Reset waiting time.
sleepTime = 100;
}
catch (Exception ex)
{
// TODO: Add some logging here
// There was a problem with receiving a request, wait some time before we try again.
Thread.Sleep(sleepTime);
// Next time wait twice as long
sleepTime = sleepTime * 2;
if (ex is MessagingEntityNotFoundException)
{
// The topic or subscription has disappeared, create a new one
subscription = null;
}
}
}
}
private static void ProcessRequests(AdapterSubscription subscription, ManualResetEvent stopEvent)
{
subscription.ProcessRequests(
AdapterBusinessLogic.GetObjectData,
AdapterBusinessLogic.UpdateObject,
AdapterBusinessLogic.CreateObject,
stopEvent);
}
static void Main(string[] args)
{
var stopEvent = new ManualResetEvent(false);
var subscription = new AdapterSubscription("Ax");
System.Console.WriteLine("Start processing requests...");
Task.Run(() => ProcessRequests(subscription, stopEvent));
System.Console.WriteLine("Press any key to stop processing messages...");
System.Console.ReadKey();
stopEvent.Set();
Thread.Sleep(1000);
}
