Current-limiting stunts for high-concurrency systems

Reference:
Current Limiting Stunts in High Concurrency Systems
http://blog.csdn.net/g_hongjin/article/details/51649246

Service Interface API Current Limiting Rate Limit
http://www.cnblogs.com/exceptioneye/p/4783904.html

Google Guava cache implements the current limit of the interfacehttp:
//www.cnblogs.com/sunp823/p/5601395.html