当没有kafka broker运行时，如何禁用spring cloud stream以进行开发？

Question

我有多个spring启动应用程序实现与Kafka经纪人的spring cloud stream。我想知道我是否可以停止或禁用spring cloud stream或kafka broker连接来启动应用程序。

Answer 1

您可以在类路径中添加一个noop绑定器，并使其成为默认绑定器，或者为您的绑定指定它。以下是Kotlin的一些代码：

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]"
    }
}

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()

}

//资源/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

或者在配置文件application.yml中指定默认绑定器

spring:
  cloud:
    stream:
      bindings:
        defaultBinder: noop

--

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