/// <summary>
/// Gets the latest offset for a Topic partition.
/// </summary>
/// <param name="router">Router used to derive latest offset.</param>
/// <param name="topic">Topic to determine latest offset for.</param>
/// <param name="partitionID">Topic partition to determine latest offset for.</param>
/// <returns>The latest offset for a partition in a topic.</returns>
public static long LatestOffset(this BrokerRouter router, string topic, int partitionID = 0)
{
long offset = 0;
FetchResponse response = router.Fetch(topic, partitionID);
if ((object)response != null)
{
offset = response.HighWaterMark;
}
return(offset);
}
private static Message ReadMessage(BrokerRouter router, string topic, int messageIndex, int maxBytes = 32768)
{
Message message = null;
long offset = router.LatestOffset(topic) - (2 - messageIndex);
List <Message> messages = router.Fetch(topic, 0, offset, maxBytes)?.Messages;
if ((messages?.Count ?? 0) > 0)
{
message = messages?[0];
}
if ((object)message == null)
{
throw new InvalidOperationException("No Kafka record to consume");
}
return(message);
}