Spring Cloud Bus links nodes of a distributed system with a lightweight message broker. This can then be used to broadcast state changes (e.g. configuration changes) or other management instructions. The only implementation currently is with an AMQP broker as the transport, but the same basic feature set (and some more depending on the transport) is on the roadmap for other transports.

main主线程和自定义线程（Thread），自定义线程包括new Thread(Runnable target)和继承Thread

确认模式

延时加载（lazy loading）

Consul是一个分布式高可用的系统，它包含多个组件，但是作为一个整体，在微服务架构中为我们的基础设施提供服务发现和服务配置的工具。它包含了下面几个特性：

Spring Cloud构建在Spring Boot之上，提供了微服务体系和架构等相关的管理，例如：服务治理、配置管理等。Spring Cloud Reference Manual