public ExampleService(ExampleWorker exampleWorker, ILogger <ExampleService> logger = null) //keeping exampleWorker concrete here for example simplicity...
{
_exampleWorker = exampleWorker;
_logger = logger;
}
private static async Task Receive(MessageQueue queue, bool limitHours, Tuple <int, int> hours, CancellationToken cancellationToken)
{
Log.Info("Starting Receive");
// Create our worker
using (var worker = new ExampleWorker())
{
// Loop until cancelled
while (cancellationToken.IsCancellationRequested == false)
{
// Check if we are limiting run hours
if (limitHours && hours != null)
{
var hour = DateTime.Now.Hour;
if (hour >= hours.Item2 && hour < hours.Item1)
{
Log.Info("Hour limit reached");
break;
}
}
Console.WriteLine();
// Read each queue message in a transaction so failures don't destory the message
using (var transaction = new MessageQueueTransaction())
{
Message message = null;
try
{
transaction.Begin();
// Wait update to 1 minute for a message to appear in the queue
message = queue.Receive(TimeSpan.FromMinutes(1), transaction);
Log.Info($"{message.Id} {message.Label}: Received");
// Get the JSON body
var body = await Read(message);
// Some error handling
if (body == null)
{
Log.Warn($"{message.Id} {message.Label}: Body could not be parsed");
transaction.Commit();
continue;
}
// Execute the message
worker.Execute(message.Id, body, Log);
Log.Info($"{message.Id} {message.Label}: Complete");
// Tell the queue we are done with the message so it is removed
transaction.Commit();
}
catch (TaskCanceledException)
{
Log.Warn($"{message?.Id} {message.Label}: TaskCanceledException");
// Tell the queue the message was not processed so it is returned
transaction.Abort();
}
catch (MessageQueueException e)
{
Log.Warn(e.Message);
break;
}
catch (Exception e)
{
Log.Error($"{message?.Id} {message.Label}: {e.Message}", e);
// Abort instead of commit if you want to leave it in the queue
transaction.Commit();
}
}
}
}
}