Talk is cheap，show me the code.

 原理架构图  用rabbitMQ或者Kafka都属于三方组件，必然要开启@EnableDiscoveryClient来代替@EnableEurekaClient想用上消息总线还须要加上如下配置，这样消息总线才能监测到组件的变化并进行同步spring.rabbitmq.host=localhostspring.rabbitmq.port=5672spring.ra...

1. 依赖需要引入下面三个依赖：compile('org.springframework.cloud:spring-cloud-starter-config')compile('org.springframework.boot:spring-boot-starter-actuator')compile('org.springframework.boot:spring-boot-sta...

信号量的隔离：it executes on the calling thread and concurrent requests are limited by the semaphore count.每次调用线程，当前请求通过计数信号量进行限制，当信号大于了最大请求数（maxConcurrentRequests）时，进行限制，调用fallback接口快速返回。最重要的是，信号量的调用...