/// <summary>
/// Gets and processes the next message from the queue.
/// </summary>
/// <param name="processMessage">Processing action.</param>
/// <param name="onError">Error action. Should not throw an exception.</param>
/// <returns>True if the message is processed, false if the queue is empty.</returns>
public bool ReadNextMessage <T>(
Action <T> processMessage,
Action <Exception, T, CloudQueueMessage> onError
) where T : IGatewayMessage
{
Guard.NotNull(processMessage, "processMessage");
// TODO set a thread updating invisibility timeout
CloudQueueMessage queueMessage = _queue.GetMessage();
if (queueMessage == null)
{
return(false);
}
T msg = default(T);
try
{
msg = GatewayPacket.Unpack <T>(queueMessage.AsBytes, _gatewayBlobStore);
processMessage(msg);
}
catch (Exception e)
{
if (onError != null)
{
onError(e, msg, queueMessage);
}
}
finally
{
_queue.DeleteMessage(queueMessage);
}
return(true);
}