当没有运行 kafka 代理时，如何禁用 Spring Cloud Stream 以用于开发目的？

Question

我有多个使用 kafka 代理实现 Spring Cloud Stream 的 Spring Boot 应用程序。我想知道是否可以停止或禁用 spring 云流或 kafka 代理连接以启用应用程序。

Answer 1

您可以通过在 spring boot 应用程序中禁用 kafka 绑定来做到这一点

1. 应用类

   import org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration;
   
   @SpringBootApplication(exclude = KafkaAutoConfiguration.class)
   
   public class Application {
     ...
   }
   

2. application.yml（如果使用 yml）

   spring: 
     autoconfigure:
       exclude: org.org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration
   

3. application.properties（如果使用属性）

   spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration
   

Answer 2

即使代理不可用，应用程序也应该启动。

您可以在类路径中添加一个 noop Binder 并将其设置为默认绑定器或为您的绑定指定它。 这里有一些 Kotlin 代码：

NoOpBinder 实现类：

package com.demo

import org.slf4j.LoggerFactory
import org.springframework.cloud.stream.binder.Binder
import org.springframework.cloud.stream.binder.Binding
import org.springframework.cloud.stream.binder.ConsumerProperties
import org.springframework.cloud.stream.binder.ProducerProperties
import org.springframework.messaging.MessageChannel

class NoOpBinder : Binder<MessageChannel, ConsumerProperties, ProducerProperties> {
    val logger = LoggerFactory.getLogger(javaClass)!!
    override fun bindConsumer(
        name: String,
        group: String,
        inboundBindTarget: MessageChannel,
        consumerProperties: ConsumerProperties
    ): Binding<MessageChannel> = NoOpBinding(name).also { logger.info("bindConsumer: $it") }

    override fun bindProducer(
        name: String,
        outboundBindTarget: MessageChannel,
        producerProperties: ProducerProperties
    ): Binding<MessageChannel> = NoOpBinding(name).also { logger.info("bindProducer: $it") }

    private class NoOpBinding(val binderName: String) : Binding<MessageChannel> {
        val logger = LoggerFactory.getLogger(javaClass)!!

        override fun getName() = binderName
        override fun unbind() {
            logger.info("unbind: $this")
        }

        override fun toString() = "NoOpBinding [$name]"
    }
}

一个配置类：

package com.demo

import org.springframework.context.annotation.Bean

// Warn: this class is referenced in META-INF/spring.binders and used by spring cloud stream to instantiate binders.
class NoOpBinderServiceConfigurer {

    @Bean
    fun noOpBinder() = NoOpBinder()

}

//resources/META-INF/spring.binders

noop: com.demo.NoOpBinderServiceConfigurer

在配置文件 application.yml 中指定绑定器

spring:
  cloud:
    stream:
      bindings:
        my-binding:
          destination: my-destination
          group: my-group
          binder: noop

或者在你的配置文件 application.yml 中指定默认的 binder

spring:
  cloud:
    stream:
      bindings:
        defaultBinder: noop

--

参考：

• https://cloud.spring.io/spring-cloud-stream/spring-cloud-stream.html#multiple-binders