Kafka.net使用编程入门(二)

1.首先创建一个Topic，命令如下:

kafka-topics --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic MyTopic

2.创建两个控制台程序:

 

3.KafkaProducer程序: 

class Program
    {
        static void Main(string[] args)
        {
            do
            {
                Produce(GetKafkaBroker(), getTopicName());
                System.Threading.Thread.Sleep(3000);
            } while (true);
        }

        private static void Produce(string broker, string topic)
        {
            var options = new KafkaOptions(new Uri(broker));
            var router = new BrokerRouter(options);
            var client = new Producer(router);

            var currentDatetime =DateTime.Now;
            var key = currentDatetime.Second.ToString();
            var events = new[] { new Message("Hello World " + currentDatetime, key) };
            client.SendMessageAsync(topic, events).Wait(1500);
            Console.WriteLine("Produced: Key: {0}. Message: {1}", key, events[0].Value.ToUtf8String());

            using (client) { }
        }

        private static string GetKafkaBroker()
        {
            string KafkaBroker = string.Empty;
            const string kafkaBrokerKeyName = "KafkaBroker";

            if (!ConfigurationManager.AppSettings.AllKeys.Contains(kafkaBrokerKeyName))
            {
                KafkaBroker = "http://localhost:9092";
            }
            else
            {
                KafkaBroker = ConfigurationManager.AppSettings[kafkaBrokerKeyName];
            }
            return KafkaBroker;
        }
        private static string getTopicName()
        {
            string TopicName = string.Empty;
            const string topicNameKeyName = "Topic";

            if (!ConfigurationManager.AppSettings.AllKeys.Contains(topicNameKeyName))
            {
                throw new Exception("Key \"" + topicNameKeyName + "\" not found in Config file -> configuration/AppSettings");
            }
            else
            {
                TopicName = ConfigurationManager.AppSettings[topicNameKeyName];
            }
            return TopicName;
        }
    }

4.KafkaConsumer程序:

class Program
    {
        static void Main(string[] args)
        {
            Consume(getKafkaBroker(), getTopicName());
            
        }

        private static void Consume(string broker, string topic)
        {   
            var options = new KafkaOptions(new Uri(broker));
            var router = new BrokerRouter(options);
            var consumer = new Consumer(new ConsumerOptions(topic, router));

            //Consume returns a blocking IEnumerable (ie: never ending stream)
            foreach (var message in consumer.Consume())
            {
                Console.WriteLine("Response: Partition {0},Offset {1} : {2}",
                    message.Meta.PartitionId, message.Meta.Offset, message.Value.ToUtf8String());
            }
        }

        private static string getKafkaBroker()
        {
            string KafkaBroker = string.Empty;
            var KafkaBrokerKeyName = "KafkaBroker";

            if (!ConfigurationManager.AppSettings.AllKeys.Contains(KafkaBrokerKeyName))
            {
                KafkaBroker = "http://localhost:9092";
            }
            else
            {
                KafkaBroker = ConfigurationManager.AppSettings[KafkaBrokerKeyName];
            }
            return KafkaBroker;
        }

        private static string getTopicName()
        {
            string TopicName = string.Empty;
            var TopicNameKeyName = "Topic";

            if (!ConfigurationManager.AppSettings.AllKeys.Contains(TopicNameKeyName))
            {
                throw new Exception("Key \"" + TopicNameKeyName + "\" not found in Config file -> configuration/AppSettings");
            }
            else
            {
                TopicName = ConfigurationManager.AppSettings[TopicNameKeyName];
            }
            return TopicName;
        }
    }

5.Consumer结果: