springcloud 断路器

https://www.jb51.net/article/138572.htm

 参考资料：

http://www.cnblogs.com/ulysses-you/p/7281662.html

http://www.lordofthejars.com/2014/09/defend-your-application-with-hystrix.html

https://www.slideshare.net/spjelkavik/hystrix-what-did-we-learn?qid=bc5fba99-23da-41bd-9530-8c3207770cac&v=&b=&from_search=2

http://bed-con.org/2014/files/slides/uwe_friedrichsen-hystrix.pdf  关于参数配置（*）

https://tech.meituan.com/service-fault-tolerant-pattern.html

http://www.hascode.com/2017/02/resilient-architecture-circuit-breakers-for-java-hystrix-vert-x-javaslang-and-failsafe-examples/