/// <summary>
/// In this example
/// - consumer group functionality (i.e. .Subscribe + offset commits) is not used.
/// - the consumer is manually assigned to a partition and always starts consumption
/// from a specific offset (0).
/// </summary>
public static void Run_ManualAssign(string brokerList, List <string> topics, CancellationToken cancellationToken)
{
var config = new ConsumerConfig
{
// the group.id property must be specified when creating a consumer, even
// if you do not intend to use any consumer group functionality.
GroupId = new Guid().ToString(),
BootstrapServers = brokerList,
// partition offsets can be committed to a group even by consumers not
// subscribed to the group. in this example, auto commit is disabled
// to prevent this from occuring.
EnableAutoCommit = true
};
using (var consumer = new Consumer <Ignore, string>(config))
{
consumer.Assign(topics.Select(topic => new TopicPartitionOffset(topic, 0, Offset.Beginning)).ToList());
consumer.OnError += (_, e)
=> Console.WriteLine($"Error: {e.Reason}");
consumer.OnPartitionEOF += (_, topicPartitionOffset)
=> Console.WriteLine($"End of partition: {topicPartitionOffset}");
while (!cancellationToken.IsCancellationRequested)
{
try
{
var consumeResult = consumer.Consume(cancellationToken);
Console.WriteLine($"Received message at {consumeResult.TopicPartitionOffset}: ${consumeResult.Message}");
}
catch (ConsumeException e)
{
Console.WriteLine($"Consume error: {e.Error}");
}
}
consumer.Close();
}
}
