/// <summary>
/// Acknowledges received message. Throws exception on error.
/// </summary>
/// <param name="ackType"></param>
/// <param name="deliveryTag"></param>
public static void AcknowledgeMessage(ManualAckType ackType, ulong deliveryTag)
{
if (_channel == null)
{
// do not try to re-connect, because messages already nacked automatically
throw new Exception("No connection to RabbitMQ");
}
switch (ackType)
{
case ManualAckType.Ack:
_channel.BasicAck(deliveryTag, multiple: false);
break;
case ManualAckType.Nack:
_channel.BasicNack(deliveryTag, multiple: false, requeue: false);
break;
case ManualAckType.NackAndRequeue:
_channel.BasicNack(deliveryTag, multiple: false, requeue: true);
break;
case ManualAckType.Reject:
_channel.BasicReject(deliveryTag, requeue: false);
break;
case ManualAckType.RejectAndRequeue:
_channel.BasicReject(deliveryTag, requeue: true);
break;
}
}
/// <summary>
/// Reads message(s) from a queue. Returns JSON structure with message contents. Message data is byte[] encoded to base64 string
/// </summary>
/// <param name="inputParams"></param>
/// <returns>JSON structure with message contents</returns>
public static Output ReadMessage([PropertyTab] ReadInputParams inputParams)
{
Output output = new Output();
OpenConnectionIfClosed(inputParams.HostName, inputParams.ConnectWithURI);
//channel.QueueDeclare(queue: inputParams.QueueName,
// durable: false,
// exclusive: false,
// autoDelete: false,
// arguments: null);
while (inputParams.ReadMessageCount-- > 0)
{
var rcvMessage = _channel.BasicGet(queue: inputParams.QueueName, autoAck: inputParams.AutoAck == ReadAckType.AutoAck);
if (rcvMessage != null)
{
output.Messages.Add(new Message {
Data = Convert.ToBase64String(rcvMessage.Body), MessagesCount = rcvMessage.MessageCount, DeliveryTag = rcvMessage.DeliveryTag
});
}
//break the loop if no more messagages are present
else
{
break;
}
}
// Auto acking
if (inputParams.AutoAck != ReadAckType.AutoAck && inputParams.AutoAck != ReadAckType.ManualAck)
{
ManualAckType ackType = ManualAckType.NackAndRequeue;
switch (inputParams.AutoAck)
{
case ReadAckType.AutoNack:
ackType = ManualAckType.Nack;
break;
case ReadAckType.AutoNackAndRequeue:
ackType = ManualAckType.NackAndRequeue;
break;
case ReadAckType.AutoReject:
ackType = ManualAckType.Reject;
break;
case ReadAckType.AutoRejectAndRequeue:
ackType = ManualAckType.RejectAndRequeue;
break;
}
foreach (var message in output.Messages)
{
AcknowledgeMessage(ackType, message.DeliveryTag);
}
}
return(output);
}
