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ASP.Net Core中使用的最多的是Confluent.Kafka这个包,以下用实例展示应用
1.下载Nuget包
首先是下载Confluent.Kafka这个包
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2.创建Producer消息生产者
发送者
public class KafkaProducer
{
public static async Task SendAsync(string topic, T value) where T: KafkaMessage
{
var config = new ProducerConfig { BootstrapServers = ConfigEntity.Instance.kafkaMapping.BootstrapServers };//服务器IP
ProducerBuilder producerBuilder = new ProducerBuilder(config);
using (var p = producerBuilder.Build())
{
try
{
var dr = await p.ProduceAsync(topic, new Message { Value = JsonConvert.SerializeObject(value) });
Console.WriteLine($"Delivered '{dr.Value}' to '{dr.TopicPartitionOffset}'");
}
catch (ProduceException e)
{
Console.WriteLine($"Delivery failed: {e.Error.Reason}");
}
}
}
}
其中要注意的一点ProducerBuilder
消息体中包含你的消息必须的内容
public class KafkaMessage
{
}
3.创建Consumer消息消费者
总消费类
public class KafkaConsumer where T : KafkaMessage
{
public string Topic { get; set; }
public string ConsumerGroup { get; set; }
public void Subscribe(Action dealMessage)
{
var config = new ConsumerConfig
{
GroupId = ConsumerGroup,
BootstrapServers = ConfigEntity.Instance.kafkaMapping.BootstrapServers,
AutoOffsetReset = AutoOffsetReset.Latest
};
Task.Run(() =>
{
var builder = new ConsumerBuilder(config);
using (var consumer = builder.Build())
{
consumer.Subscribe(Topic);
while (true)
{
var result = consumer.Consume();
try
{
var message = JsonConvert.DeserializeObject(result.Value);
dealMessage(message);
}
catch (Exception)
{
Console.WriteLine($"Topic : {result.Topic}, Message : {result.Value}");
}
}
}
});
}
}
子消费类
interface ITestKafkaConsumer
{
void DealMessage(TestKafkaEntity message);
void Subscribe();
}
public class TestKafkaConsumer : ITestKafkaConsumer
{
private KafkaConsumer consumer { get; set; }
public TestKafkaConsumer()
{
consumer = new KafkaConsumer
{
Topic = "test",
ConsumerGroup = "console-consumer-63873",
};
}
public void DealMessage(TestKafkaEntity message)
{
Console.WriteLine("-------------------------------------------------------------");
Console.WriteLine("这是一个消费者!!!" + message.ConsumerValue);
Console.WriteLine("-------------------------------------------------------------");
}
public void Subscribe()
{
consumer.Subscribe(DealMessage);
}
}
通过回调方法的方式, 将子消息类中的方法传入总消息类中
4.注入消费者
在Startup.cs类中的ConfigureServices方法中注入子消费类:
public void ConfigureServices(IServiceCollection services)
{
services.AddSingleton();
}
然后在Program.cs类中的Main方法启动消费者:
public static void Main(string[] args)
{
var hostBuilder = CreateHostBuilder(args);
var host = hostBuilder.Build();
using (var scope = host.Services.CreateScope())
{
var testConsumer = scope.ServiceProvider.GetService();
testConsumer.Subscribe();
}
host.Run(); ;
}
结果展示:
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以上就是kafka在ASP.Net Core中的简单实现
源码地址: https://github.com/WxhShine/RestfulAPILearn/tree/master/ASPCoreRestfulApiDemo/Kafka