private void ProcessMessages()
{
int retryAttempt = 0;
var policyFalse = Policy.HandleResult <bool>(false).WaitAndRetryForever((r) => TimeSpan.FromSeconds(Math.Min(8, Math.Pow(2, ++retryAttempt))));
var policyTrue = Policy.HandleResult <bool>(true).RetryForever((result) => retryAttempt = 0);
var policy = Policy.Wrap(policyFalse, policyTrue);
policy.Execute((cancellationToken) =>
{
receivedHandled.WaitOne();
foreach (QueuePriority priority in Enum.GetValues(typeof(QueuePriority)).Cast <QueuePriority>().OrderByDescending(p => p))
{
var queue = GetAzureQueue(priority, false);
if (this.messageReceivedHandler != null)
{
var message = queue?.GetMessage(this.VisibilityTimeout);
if (message != null)
{
var eventArgs = new MessageReceivedEventArgs {
MessageWrapper = new MessageWrapper(message, queue)
};
OnMessageReceived(eventArgs);
return(true);
}
}
if (this.messagesReceivedHandler != null)
{
var messages = queue?.GetMessages(DequeueCount, this.VisibilityTimeout);
if (messages.Any())
{
var eventArgs = new MessagesReceivedEventArgs {
MessageWrappers = messages.Select(m => new MessageWrapper(m, queue))
};
OnMessagesReceived(eventArgs);
return(true);
}
}
}
return(false);
}, this.cancellationToken.Token);
}
protected virtual void OnMessagesReceived(MessagesReceivedEventArgs e)
{
this.messagesReceivedHandler?.Invoke(this, e);
}