/// <summary>
/// Remove subscriptions
/// </summary>
public void UnSubscribe(string queueName, DispatcherQueueCallback callback)
{
if (this.m_watchers != null && this.m_watchers.TryGetValue(queueName, out var queueWatcher))
{
queueWatcher.Remove(callback);
}
}
/// <summary>
/// Stop the current service
/// </summary>
public bool Stop()
{
this.Stopping?.Invoke(this, EventArgs.Empty);
ApplicationServiceContext.Current.GetService <IDispatcherQueueManagerService>().UnSubscribe(this.m_configuration.Gs1QueueName, this.m_handler);
this.m_handler = null;
this.Stopped?.Invoke(this, EventArgs.Empty);
return(true);
}
/// <summary>
/// Subscribe to the queue
/// </summary>
public void SubscribeTo(string queueName, DispatcherQueueCallback callback)
{
if (!this.m_watchers.TryGetValue(queueName, out var dispatcher))
{
dispatcher = new List <DispatcherQueueCallback>();
this.m_watchers.TryAdd(queueName, dispatcher);
}
dispatcher.Add(callback);
}
/// <summary>
/// Start the daemon service
/// </summary>
/// <returns></returns>
public bool Start()
{
this.Starting?.Invoke(this, EventArgs.Empty);
// Create handler
this.m_handler = (e) =>
{
do
{
object body = null;
try
{
var dq = ApplicationServiceContext.Current.GetService <IDispatcherQueueManagerService>().Dequeue(this.m_configuration.Gs1QueueName);
if (dq == null)
{
break;
}
body = dq.Body;
this.SendQueueMessage(dq);
}
catch (Exception ex)
{
this.m_tracer.TraceError(">>>> !!ALERT!! >>>> Error sending message to GS1 broker. Message will be placed in dead-letter queue");
this.m_tracer.TraceError(ex.ToString());
ApplicationServiceContext.Current.GetService <IDispatcherQueueManagerService>().Enqueue($"{this.m_configuration.Gs1QueueName}.dead", body);
}
} while (true);
};
// Queue Handler
ApplicationServiceContext.Current.Started += (o, e) =>
{
var queueService = ApplicationServiceContext.Current.GetService <IDispatcherQueueManagerService>();
queueService.Open(this.m_configuration.Gs1QueueName);
queueService.SubscribeTo(this.m_configuration.Gs1QueueName, this.m_handler);
queueService.Open($"{this.m_configuration.Gs1QueueName}.dead");
};
this.Started?.Invoke(this, EventArgs.Empty);
return(true);
}
