public void ConsumerShouldBeAbleToGetCurrentOffsetInformation()
{
using (var router = new BrokerRouter(new KafkaOptions(IntegrationConfig.IntegrationUri)))
using (var producer = new Producer(router))
{
var startOffsets = producer.GetTopicOffsetAsync(IntegrationConfig.IntegrationTopic).Result
.Select(x => new OffsetPosition(x.PartitionId, x.Offsets.Max())).ToArray();
using (var consumer = new BlockingConsumer(new ConsumerOptions(IntegrationConfig.IntegrationTopic, router), startOffsets))
{
for (int i = 0; i < 20; i++)
{
producer.SendMessageAsync(IntegrationConfig.IntegrationTopic, new[] { new Message(i.ToString(), "1") }).Wait();
}
var results = consumer.Consume().Take(20).ToList();
//ensure the produced messages arrived
for (int i = 0; i < 20; i++)
{
Assert.That(results[i].Value.ToUtf8String(), Is.EqualTo(i.ToString()));
}
//the current offsets should be 20 positions higher than start
var currentOffsets = consumer.GetOffsetPosition();
Assert.That(currentOffsets.Sum(x => x.Offset) - startOffsets.Sum(x => x.Offset), Is.EqualTo(20));
}
}
}
public async void ConsumerShouldMoveToNextAvailableOffsetWhenQueryingForNextMessage()
{
const int expectedCount = 1000;
var options = new KafkaOptions(IntegrationConfig.IntegrationUri)
{
Log = new ConsoleLog()
};
using (var producerRouter = new BrokerRouter(options))
using (var producer = new Producer(producerRouter))
{
//get current offset and reset consumer to top of log
var offsets = await producer.GetTopicOffsetAsync(IntegrationConfig.IntegrationTopic).ConfigureAwait(false);
using (var consumerRouter = new BrokerRouter(options))
using (var consumer = new BlockingConsumer(new ConsumerOptions(IntegrationConfig.IntegrationTopic, consumerRouter),
offsets.Select(x => new OffsetPosition(x.PartitionId, x.Offsets.Max())).ToArray()))
{
Console.WriteLine("Sending {0} test messages", expectedCount);
var response = await producer.SendMessageAsync(IntegrationConfig.IntegrationTopic,
Enumerable.Range(0, expectedCount).Select(x => new Message(x.ToString())));
Assert.That(response.Any(x => x.Error != (int)ErrorResponseCode.NoError), Is.False, "Error occured sending test messages to server.");
var stream = consumer.Consume();
Console.WriteLine("Reading message back out from consumer.");
var data = stream.Take(expectedCount).ToList();
var consumerOffset = consumer.GetOffsetPosition().OrderBy(x => x.Offset).ToList();
var serverOffset = await producer.GetTopicOffsetAsync(IntegrationConfig.IntegrationTopic).ConfigureAwait(false);
var positionOffset = serverOffset.Select(x => new OffsetPosition(x.PartitionId, x.Offsets.Max()))
.OrderBy(x => x.Offset)
.ToList();
Assert.That(consumerOffset, Is.EqualTo(positionOffset), "The consumerOffset position should match the server offset position.");
Assert.That(data.Count, Is.EqualTo(expectedCount), "We should have received 2000 messages from the server.");
}
}
}