AssignPastEnd.cs

// Copyright 2016-2017 Confluent Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Refer to LICENSE for more information.

#pragma warning disable xUnit1026

using System;
using System.Collections.Generic;
using Xunit;


namespace Confluent.Kafka.IntegrationTests
{
    public partial class Tests
    {
        /// <summary>
        ///     Test functionality of Consumer.Consume when assigned to offset
        ///     higher than the offset of the last message on a partition.
        /// </summary>
        [Theory, MemberData(nameof(KafkaParameters))]
        public void AssignPastEnd(string bootstrapServers)
        {
            LogToFile("start AssignPastEnd");

            var consumerConfig = new ConsumerConfig
            {
                GroupId = Guid.NewGuid().ToString(),
                BootstrapServers = bootstrapServers,
                SessionTimeoutMs = 6000
            };
            var producerConfig = new ProducerConfig { BootstrapServers = bootstrapServers };

            var testString = "hello world";

            DeliveryResult<Null, byte[]> dr;
            using (var producer = new ProducerBuilder<Null, byte[]>(producerConfig).Build())
            {
                dr = producer.ProduceAsync(singlePartitionTopic, new Message<Null, byte[]> { Value = Serializers.Utf8.Serialize(testString, SerializationContext.Empty) }).Result;
                Assert.True(dr.Offset >= 0);
                producer.Flush(TimeSpan.FromSeconds(10));
            }

            consumerConfig.AutoOffsetReset = AutoOffsetReset.Latest;
            using (var consumer = new ConsumerBuilder<Null, byte[]>(consumerConfig).Build())
            {
                ConsumeResult<Null, byte[]> record;
                consumer.Assign(new List<TopicPartitionOffset>() { new TopicPartitionOffset(dr.TopicPartition, dr.Offset+1) });
                record = consumer.Consume(TimeSpan.FromSeconds(2));
                Assert.Null(record);
                consumer.Assign(new List<TopicPartitionOffset>() { new TopicPartitionOffset(dr.TopicPartition, dr.Offset+2) });
                consumer.Consume(TimeSpan.FromSeconds(2));
                Assert.Null(record);
            }

            consumerConfig.AutoOffsetReset = AutoOffsetReset.Earliest;
            using (var consumer = new ConsumerBuilder<byte[], byte[]>(consumerConfig).Build())
            {
                ConsumeResult<byte[], byte[]> record;
                consumer.Assign(new List<TopicPartitionOffset>() { new TopicPartitionOffset(dr.TopicPartition, dr.Offset+1) });
                record = consumer.Consume(TimeSpan.FromSeconds(2));
                Assert.Null(record);
                // Note: dr.Offset+2 is an invalid (c.f. dr.Offset+1 which is valid), so auto.offset.reset will come
                // into play here to determine which offset to start from (earliest). Due to the produce call above,
                // there is guaranteed to be a message on the topic, so consumer.Consume will return true.
                consumer.Assign(new List<TopicPartitionOffset>() { new TopicPartitionOffset(dr.TopicPartition, dr.Offset+2) });
                record = consumer.Consume(TimeSpan.FromSeconds(10));
                Assert.NotNull(record?.Message);
            }

            Assert.Equal(0, Library.HandleCount);
            LogToFile("end   AssignPastEnd");
        }

    }
}