private async Task ProcessMessageAsync(object model, BasicDeliverEventArgs rabbitMessage, Func <QueueMessage <T>, CancellationToken, Task> onMessageReceived, CancellationToken cancellationToken)
{
if (model == null)
{
throw new ArgumentNullException(nameof(model));
}
if (rabbitMessage == null)
{
throw new ArgumentNullException(nameof(rabbitMessage));
}
if (onMessageReceived == null)
{
throw new ArgumentNullException(nameof(onMessageReceived));
}
try
{
// Deserialize object
T messageObject = _serializer.Deserialize <T>(Encoding.UTF8.GetString(rabbitMessage.Body));
// Validate object
string validationErrors;
bool success = _validationHelper.TryValidate(messageObject, out validationErrors);
if (!success)
{
_logger.ErrorFormat(
Resources.MessageFailsValidationLogEntry,
rabbitMessage.DeliveryTag,
_queueName,
validationErrors);
NegativelyAcknowledge(rabbitMessage.DeliveryTag);
return;
}
_logger.InfoFormat(Resources.MessageSuccessfullyReceivedLogEntry, rabbitMessage.DeliveryTag, _queueName);
var message = new QueueMessage <T>(messageObject,
rabbitMessage.DeliveryTag,
rabbitMessage.RoutingKey,
rabbitMessage.BasicProperties.Headers);
// call the event handler to process the message
await onMessageReceived(message, cancellationToken);
}
catch (Exception ex)
{
_logger.ErrorFormat(
Resources.MessageFailsValidationLogEntry,
rabbitMessage.DeliveryTag,
_queueName,
ex.Message);
NegativelyAcknowledge(rabbitMessage.DeliveryTag);
}
}
public void Publish(T message, IDictionary <string, object> headers, string dynamicRoutingKey)
{
if (message == null)
{
throw new ArgumentNullException(nameof(message));
}
try
{
// Validate message
string validationErrors;
if (!_validationHelper.TryValidate(message, out validationErrors))
{
throw new ValidationException(validationErrors);
}
// serialise object...
string messageBody = _serializer.SerializeObject(message);
// Determine routing key
var routingKey = dynamicRoutingKey ?? _publisherConfig.RoutingKey;
_logger.DebugFormat(Resources.PublishingMessageLogEntry, _publisherConfig.ExchangeName, routingKey, messageBody);
lock (_lock)
{
if (!_connected)
{
_connection = _connectionFactory.CreateConnection(_publisherConfig.Name, _cancellationToken);
_channel = _connection.CreateModel();
_connected = true;
}
}
// Create message properties
var basicProperties = CreateBasicProperties(headers);
_channel.BasicPublish(_publisherConfig.ExchangeName,
routingKey,
true,
basicProperties,
Encoding.UTF8.GetBytes(messageBody));
_logger.Info($"Sent message");
}
catch (Exception ex)
{
_logger.Error($"An unexpected exception occurred, error details '{ex.Message}'", ex);
lock (_lock)
{
_connected = false;
}
if (_channel != null)
{
_channel.Dispose();
}
if (_connection != null)
{
_connection.Dispose();
}
}
}
