{"id":318464,"date":"2021-02-23T15:00:46","date_gmt":"2021-02-23T15:00:46","guid":{"rendered":"http:\/\/savepearlharbor.com\/?p=318464"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T21:00:00","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=318464","title":{"rendered":"First touch of Kafka"},"content":{"rendered":"\n
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\u041f\u0440\u0435\u0436\u0434\u0435 \u0447\u0435\u043c \u043d\u0430\u0447\u0430\u0442\u044c \u044f \u0431\u044b \u0445\u043e\u0442\u0435\u043b \u043e\u0442\u043c\u0435\u0442\u0438\u0442\u044c, \u0447\u0442\u043e \u044d\u0442\u043e \u0432\u0441\u0435\u0433\u043e \u043b\u0438\u0448\u044c \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u043e\u0439 \u0442\u0443\u0442\u043e\u0440\u0438\u0430\u043b \u043f\u043e \u0431\u044b\u0441\u0442\u0440\u043e\u043c\u0443 \u0441\u0442\u0430\u0440\u0442\u0443 \u0434\u043b\u044f \u0442\u0435\u0445 \u043a\u0442\u043e, \u043a\u0430\u043a \u0438 \u044f, \u043d\u0438 \u0440\u0430\u0437\u0443 \u043d\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b Kafka \u043d\u0430 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0435.<\/u><\/p>\n

\u0418 \u0442\u0430\u043a \u043f\u0440\u0438\u0441\u0442\u0443\u043f\u0438\u043c!<\/p>\n

\u0415\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0439 \u0431\u0440\u043e\u043a\u0435\u0440 Kafka<\/a> \u0438 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u044b\u0439 \u0434\u043b\u044f \u0435\u0433\u043e \u0440\u0430\u0431\u043e\u0442\u044b ZooKeeper <\/a>\u044f \u0431\u0443\u0434\u0443 \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0442\u044c \u0432 Docker<\/a>.<\/p>\n

\u0421\u043f\u0435\u0440\u0432\u0430 \u0441\u043e\u0437\u0434\u0430\u043c \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u0443\u044e \u0441\u0435\u0442\u044c kafkanet<\/code><\/p>\n

docker network create kafkanet<\/code><\/pre>\n
<\/figcaption><\/figure>\n
\u0417\u0430\u043f\u0443\u0441\u043a \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 \u0441 ZooKeeper<\/a><\/p>\n
docker run -d --network=kafkanet --name=zookeeper -e ZOOKEEPER_CLIENT_PORT=2181 -e ZOOKEEPER_TICK_TIME=2000 -p 2181:2181 confluentinc\/cp-zookeeper<\/code><\/pre>\n
<\/figcaption><\/figure>\n
\u0417\u0430\u043f\u0443\u0441\u043a \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 \u0441 Kafka<\/a><\/p>\n
docker run -d --network=kafkanet --name=kafka -e KAFKA_ZOOKEEPER_CONNECT=zookeeper:2181 -e KAFKA_ADVERTISED_LISTENERS=PLAINTEXT:\/\/localhost:9092 -e KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR=1 -p 9092:9092 confluentinc\/cp-kafka<\/code><\/pre>\n
<\/figcaption><\/figure>\n
\u0414\u043b\u044f \u0442\u043e\u0433\u043e \u0447\u0442\u043e\u0431\u044b \u0443\u0431\u0435\u0434\u0438\u0442\u044c\u0441\u044f \u0432 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0438 \u043e\u0448\u0438\u0431\u043e\u043a, \u043c\u043e\u0436\u043d\u043e \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u043b\u043e\u0433 docker logs kafka<\/code><\/p>\n
\u0414\u0430\u043b\u0435\u0435 \u043f\u0440\u043e\u0432\u0435\u0440\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0431\u0440\u043e\u043a\u0435\u0440\u0430 Kafka, \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0432 \u043f\u0440\u043e\u0441\u0442\u044b\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0438\u0435 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u0442\u0435\u0441\u0442\u043e\u0432\u043e\u0439 \u0442\u0435\u043c\u044b, \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u044e \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439 \u0438 \u0438\u0445 \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u0435\u043d\u0438\u0435<\/p>\n
\u0414\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u044f \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0443\u0441\u044c \u043a \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0443 kafka<\/code><\/p>\n
docker exec -it kafka bash<\/code><\/pre>\n
<\/figcaption><\/figure>\n
\u0421\u043e\u0437\u0434\u0430\u043c \u0442\u043e\u043f\u0438\u043a demo-topic<\/code><\/p>\n
\/bin\/kafka-topics --create --topic demo-topic --bootstrap-server kafka:9092<\/code><\/pre>\n
\u0412\u044b\u0432\u0435\u0434\u0443 \u0441\u043f\u0438\u0441\u043e\u043a \u0432\u0441\u0435\u0445 \u0442\u043e\u043f\u0438\u043a\u043e\u0432<\/p>\n
\/bin\/kafka-topics --list --zookeeper zookeeper:2181<\/code><\/pre>\n
\u0418 \u0432\u044b\u0432\u0435\u0434\u0443 \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0441\u043e\u0437\u0434\u0430\u043d\u043d\u043e\u0433\u043e \u0442\u043e\u043f\u0438\u043a\u0430<\/p>\n
\/bin\/kafka-topics --describe --topic demo-topic --bootstrap-server kafka:9092<\/code><\/pre>\n
<\/figcaption><\/figure>\n
\u0421\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u044e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439<\/p>\n
\/bin\/kafka-console-producer --topic demo-topic --bootstrap-server kafka:9092<\/code><\/pre>\n
\u0418 \u043f\u043e\u0441\u043b\u0435 \u043f\u0440\u043e\u0447\u0438\u0442\u0430\u044e \u044d\u0442\u0438 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f<\/p>\n
\/bin\/kafka-console-consumer --topic demo-topic --from-beginning --bootstrap-server kafka:9092<\/code><\/pre>\n
<\/figcaption><\/figure>\n
\u0414\u0430\u043b\u0435\u0435 \u044f \u0441\u043e\u0437\u0434\u0430\u043c \u0434\u0432\u0430 \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0438\u0445 .NET \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f: KafkaProducer<\/code>, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0431\u0443\u0434\u0435\u0442 \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f, \u0438 KafkaConsumer<\/code>, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u044f\u0442\u044c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f. \u0414\u043b\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043c\u043d\u0435 \u043f\u043e\u043d\u0430\u0434\u043e\u0431\u044f\u0442\u0441\u044f \u043f\u0430\u043a\u0435\u0442\u044b Confluent.Kafka<\/a> \u0438 Microsoft.Extensions.Hosting<\/a>.<\/p>\n
\u0412 \u043f\u0440\u043e\u0435\u043a\u0442 KafkaProducer<\/code> \u0434\u043e\u0431\u0430\u0432\u043b\u044e \u043a\u043b\u0430\u0441\u0441 KafkaProducerService<\/code><\/p>\n
using Confluent.Kafka; using Microsoft.Extensions.Hosting; using Microsoft.Extensions.Logging; using System.Threading; using System.Threading.Tasks;  namespace KafkaProducer {     public class KafkaProducerService : IHostedService     {         private readonly ILogger<KafkaProducerService> _logger;         private readonly IProducer<Null, string> _producer;          public KafkaProducerService(ILogger<KafkaProducerService> logger)         {             _logger = logger;             var config = new ProducerConfig             {                 BootstrapServers = \"localhost:9092\"             };             _producer = new ProducerBuilder<Null, string>(config).Build();         }          public async Task StartAsync(CancellationToken cancellationToken)         {             for (var i = 0; i < 5; i++)             {                 var value = $\"Event N {i}\";                 _logger.LogInformation($\"Sending >> {value}\");                 await _producer.ProduceAsync(                     \"demo-topic\",                     new Message<Null, string> { Value = value },                     cancellationToken);             }         }          public Task StopAsync(CancellationToken cancellationToken)         {             _producer?.Dispose();             _logger.LogInformation($\"{nameof(KafkaProducerService)} stopped\");             return Task.CompletedTask;         }     } }<\/code><\/pre>\n
\u0418\u0437\u043c\u0435\u043d\u044e \u0444\u0430\u0439\u043b Program.cs<\/code><\/p>\n
using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Hosting; using System;  namespace KafkaProducer {     class Program     {         static void Main(string[] args)         {             CreateHostBuilder(args).Build().Run();             Console.ReadKey();         }          private static IHostBuilder CreateHostBuilder(string[] args) =>             Host                 .CreateDefaultBuilder(args)                 .ConfigureServices((context, collection) =>                     collection.AddHostedService<KafkaProducerService>());     } }<\/code><\/pre>\n
 \u0412 \u043f\u0440\u043e\u0435\u043a\u0442 KafkaConsumer<\/code> \u0434\u043e\u0431\u0430\u0432\u043b\u044e \u043a\u043b\u0430\u0441\u0441 KafkaConsumerService<\/code><\/p>\n
using Confluent.Kafka; using Microsoft.Extensions.Hosting; using Microsoft.Extensions.Logging; using System.Threading; using System.Threading.Tasks;  namespace KafkaConsumer {     public class KafkaConsumerService : IHostedService     {         private readonly ILogger<KafkaConsumerService> _logger;         private readonly IConsumer<Ignore, string> _consumer;          public KafkaConsumerService(ILogger<KafkaConsumerService> logger)         {             _logger = logger;             var config = new ConsumerConfig             {                 BootstrapServers = \"localhost:9092\",                 GroupId = \"demo-group\",                 AutoOffsetReset = AutoOffsetReset.Earliest             };             _consumer = new ConsumerBuilder<Ignore, string>(config).Build();         }          public Task StartAsync(CancellationToken cancellationToken)         {             _consumer.Subscribe(\"demo-topic\");             while (!cancellationToken.IsCancellationRequested)             {                 var consumeResult = _consumer.Consume(cancellationToken);                 _logger.LogInformation($\"Received >> {consumeResult.Message.Value}\");             }             return Task.CompletedTask;         }          public Task StopAsync(CancellationToken cancellationToken)         {             _consumer?.Dispose();             _logger.LogInformation($\"{nameof(KafkaConsumerService)} stopped\");             return Task.CompletedTask;         }     } }<\/code><\/pre>\n
\u0418\u0437\u043c\u0435\u043d\u044e \u0444\u0430\u0439\u043b Program.cs<\/code><\/p>\n
using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Hosting; using System;  namespace KafkaConsumer {     class Program     {         static void Main(string[] args)         {             CreateHostBuilder(args).Build().Run();             Console.ReadKey();         }          private static IHostBuilder CreateHostBuilder(string[] args) =>             Host                 .CreateDefaultBuilder(args)                 .ConfigureServices((context, collection) =>                     collection.AddHostedService<KafkaConsumerService>());     } }<\/code><\/pre>\n
\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 (\u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0439<\/a>)<\/p>\n
<\/figcaption><\/figure>\n<\/div>\n
 \u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438  https:\/\/habr.com\/ru\/post\/543732\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"\n
\n
\u041f\u0440\u0435\u0436\u0434\u0435 \u0447\u0435\u043c \u043d\u0430\u0447\u0430\u0442\u044c \u044f \u0431\u044b \u0445\u043e\u0442\u0435\u043b \u043e\u0442\u043c\u0435\u0442\u0438\u0442\u044c, \u0447\u0442\u043e \u044d\u0442\u043e \u0432\u0441\u0435\u0433\u043e \u043b\u0438\u0448\u044c \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u043e\u0439 \u0442\u0443\u0442\u043e\u0440\u0438\u0430\u043b \u043f\u043e \u0431\u044b\u0441\u0442\u0440\u043e\u043c\u0443 \u0441\u0442\u0430\u0440\u0442\u0443 \u0434\u043b\u044f \u0442\u0435\u0445 \u043a\u0442\u043e, \u043a\u0430\u043a \u0438 \u044f, \u043d\u0438 \u0440\u0430\u0437\u0443 \u043d\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b Kafka \u043d\u0430 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0435.<\/u><\/p>\n
\u0418 \u0442\u0430\u043a \u043f\u0440\u0438\u0441\u0442\u0443\u043f\u0438\u043c!<\/p>\n
\u0415\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0439 \u0431\u0440\u043e\u043a\u0435\u0440 Kafka<\/a> \u0438 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u044b\u0439 \u0434\u043b\u044f \u0435\u0433\u043e \u0440\u0430\u0431\u043e\u0442\u044b ZooKeeper <\/a>\u044f \u0431\u0443\u0434\u0443 \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0442\u044c \u0432 Docker<\/a>.<\/p>\n
\u0421\u043f\u0435\u0440\u0432\u0430 \u0441\u043e\u0437\u0434\u0430\u043c \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u0443\u044e \u0441\u0435\u0442\u044c kafkanet<\/code><\/p>\n
docker network create kafkanet<\/code><\/pre>\n
<\/figcaption><\/figure>\n
\u0417\u0430\u043f\u0443\u0441\u043a \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 \u0441 ZooKeeper<\/a><\/p>\n
docker run -d --network=kafkanet --name=zookeeper -e ZOOKEEPER_CLIENT_PORT=2181 -e ZOOKEEPER_TICK_TIME=2000 -p 2181:2181 confluentinc\/cp-zookeeper<\/code><\/pre>\n
<\/figcaption><\/figure>\n
\u0417\u0430\u043f\u0443\u0441\u043a \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 \u0441 Kafka<\/a><\/p>\n
docker run -d --network=kafkanet --name=kafka -e KAFKA_ZOOKEEPER_CONNECT=zookeeper:2181 -e KAFKA_ADVERTISED_LISTENERS=PLAINTEXT:\/\/localhost:9092 -e KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR=1 -p 9092:9092 confluentinc\/cp-kafka<\/code><\/pre>\n
<\/figcaption><\/figure>\n
\u0414\u043b\u044f \u0442\u043e\u0433\u043e \u0447\u0442\u043e\u0431\u044b \u0443\u0431\u0435\u0434\u0438\u0442\u044c\u0441\u044f \u0432 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0438 \u043e\u0448\u0438\u0431\u043e\u043a, \u043c\u043e\u0436\u043d\u043e \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u043b\u043e\u0433 docker logs kafka<\/code><\/p>\n
\u0414\u0430\u043b\u0435\u0435 \u043f\u0440\u043e\u0432\u0435\u0440\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0431\u0440\u043e\u043a\u0435\u0440\u0430 Kafka, \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0432 \u043f\u0440\u043e\u0441\u0442\u044b\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0438\u0435 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u0442\u0435\u0441\u0442\u043e\u0432\u043e\u0439 \u0442\u0435\u043c\u044b, \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u044e \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439 \u0438 \u0438\u0445 \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u0435\u043d\u0438\u0435<\/p>\n
\u0414\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u044f \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0443\u0441\u044c \u043a \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0443 kafka<\/code><\/p>\n
docker exec -it kafka bash<\/code><\/pre>\n
<\/figcaption><\/figure>\n
\u0421\u043e\u0437\u0434\u0430\u043c \u0442\u043e\u043f\u0438\u043a demo-topic<\/code><\/p>\n
\/bin\/kafka-topics --create --topic demo-topic --bootstrap-server kafka:9092<\/code><\/pre>\n
\u0412\u044b\u0432\u0435\u0434\u0443 \u0441\u043f\u0438\u0441\u043e\u043a \u0432\u0441\u0435\u0445 \u0442\u043e\u043f\u0438\u043a\u043e\u0432<\/p>\n
\/bin\/kafka-topics --list --zookeeper zookeeper:2181<\/code><\/pre>\n
\u0418 \u0432\u044b\u0432\u0435\u0434\u0443 \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0441\u043e\u0437\u0434\u0430\u043d\u043d\u043e\u0433\u043e \u0442\u043e\u043f\u0438\u043a\u0430<\/p>\n
\/bin\/kafka-topics --describe --topic demo-topic --bootstrap-server kafka:9092<\/code><\/pre>\n
<\/figcaption><\/figure>\n
\u0421\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u044e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439<\/p>\n
\/bin\/kafka-console-producer --topic demo-topic --bootstrap-server kafka:9092<\/code><\/pre>\n
\u0418 \u043f\u043e\u0441\u043b\u0435 \u043f\u0440\u043e\u0447\u0438\u0442\u0430\u044e \u044d\u0442\u0438 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f<\/p>\n
\/bin\/kafka-console-consumer --topic demo-topic --from-beginning --bootstrap-server kafka:9092<\/code><\/pre>\n
<\/figcaption><\/figure>\n
\u0414\u0430\u043b\u0435\u0435 \u044f \u0441\u043e\u0437\u0434\u0430\u043c \u0434\u0432\u0430 \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0438\u0445 .NET \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f: KafkaProducer<\/code>, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0431\u0443\u0434\u0435\u0442 \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f, \u0438 KafkaConsumer<\/code>, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u044f\u0442\u044c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f. \u0414\u043b\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043c\u043d\u0435 \u043f\u043e\u043d\u0430\u0434\u043e\u0431\u044f\u0442\u0441\u044f \u043f\u0430\u043a\u0435\u0442\u044b Confluent.Kafka<\/a> \u0438 Microsoft.Extensions.Hosting<\/a>.<\/p>\n
\u0412 \u043f\u0440\u043e\u0435\u043a\u0442 KafkaProducer<\/code> \u0434\u043e\u0431\u0430\u0432\u043b\u044e \u043a\u043b\u0430\u0441\u0441 KafkaProducerService<\/code><\/p>\n
using Confluent.Kafka; using Microsoft.Extensions.Hosting; using Microsoft.Extensions.Logging; using System.Threading; using System.Threading.Tasks;  namespace KafkaProducer {     public class KafkaProducerService : IHostedService     {         private readonly ILogger<KafkaProducerService> _logger;         private readonly IProducer<Null, string> _producer;          public KafkaProducerService(ILogger<KafkaProducerService> logger)         {             _logger = logger;             var config = new ProducerConfig             {                 BootstrapServers = \"localhost:9092\"             };             _producer = new ProducerBuilder<Null, string>(config).Build();         }          public async Task StartAsync(CancellationToken cancellationToken)         {             for (var i = 0; i < 5; i++)             {                 var value = $\"Event N {i}\";                 _logger.LogInformation($\"Sending >> {value}\");                 await _producer.ProduceAsync(                     \"demo-topic\",                     new Message<Null, string> { Value = value },                     cancellationToken);             }         }          public Task StopAsync(CancellationToken cancellationToken)         {             _producer?.Dispose();             _logger.LogInformation($\"{nameof(KafkaProducerService)} stopped\");             return Task.CompletedTask;         }     } }<\/code><\/pre>\n
\u0418\u0437\u043c\u0435\u043d\u044e \u0444\u0430\u0439\u043b Program.cs<\/code><\/p>\n
using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Hosting; using System;  namespace KafkaProducer {     class Program     {         static void Main(string[] args)         {             CreateHostBuilder(args).Build().Run();             Console.ReadKey();         }          private static IHostBuilder CreateHostBuilder(string[] args) =>             Host                 .CreateDefaultBuilder(args)                 .ConfigureServices((context, collection) =>                     collection.AddHostedService<KafkaProducerService>());     } }<\/code><\/pre>\n
 \u0412 \u043f\u0440\u043e\u0435\u043a\u0442 KafkaConsumer<\/code> \u0434\u043e\u0431\u0430\u0432\u043b\u044e \u043a\u043b\u0430\u0441\u0441 KafkaConsumerService<\/code><\/p>\n
using Confluent.Kafka; using Microsoft.Extensions.Hosting; using Microsoft.Extensions.Logging; using System.Threading; using System.Threading.Tasks;  namespace KafkaConsumer {     public class KafkaConsumerService : IHostedService     {         private readonly ILogger<KafkaConsumerService> _logger;         private readonly IConsumer<Ignore, string> _consumer;          public KafkaConsumerService(ILogger<KafkaConsumerService> logger)         {             _logger = logger;             var config = new ConsumerConfig             {                 BootstrapServers = \"localhost:9092\",                 GroupId = \"demo-group\",                 AutoOffsetReset = AutoOffsetReset.Earliest             };             _consumer = new ConsumerBuilder<Ignore, string>(config).Build();         }          public Task StartAsync(CancellationToken cancellationToken)         {             _consumer.Subscribe(\"demo-topic\");             while (!cancellationToken.IsCancellationRequested)             {                 var consumeResult = _consumer.Consume(cancellationToken);                 _logger.LogInformation($\"Received >> {consumeResult.Message.Value}\");             }             return Task.CompletedTask;         }          public Task StopAsync(CancellationToken cancellationToken)         {             _consumer?.Dispose();             _logger.LogInformation($\"{nameof(KafkaConsumerService)} stopped\");             return Task.CompletedTask;         }     } }<\/code><\/pre>\n
\u0418\u0437\u043c\u0435\u043d\u044e \u0444\u0430\u0439\u043b Program.cs<\/code><\/p>\n
using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Hosting; using System;  namespace KafkaConsumer {     class Program     {         static void Main(string[] args)         {             CreateHostBuilder(args).Build().Run();             Console.ReadKey();         }          private static IHostBuilder CreateHostBuilder(string[] args) =>             Host                 .CreateDefaultBuilder(args)                 .ConfigureServices((context, collection) =>                     collection.AddHostedService<KafkaConsumerService>());     } }<\/code><\/pre>\n
\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 (\u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0439<\/a>)<\/p>\n
<\/figcaption><\/figure>\n<\/div>\n
 \u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438  https:\/\/habr.com\/ru\/post\/543732\/<\/a>
<\/br><\/br><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-318464","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/318464","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=318464"}],"version-history":[{"count":0,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=\/wp\/v2\/posts\/318464\/revisions"}],"wp:attachment":[{"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=318464"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=318464"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/savepearlharbor.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=318464"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}