FSM

https://today.java.net/article/2009/09/06/finite-state-machine-supporting-concurrent-states

https://github.com/ozkansari/atmstatemachine

http://stackoverflow.com/questions/10875317/recommended-fsm-finite-state-machine-library-for-java

https://github.com/jakesgordon/javascript-state-machine

http://www.blogjava.net/caizh2009/archive/2010/07/26/327157.html

http://activiti.org/userguide/index.html#bpmnGateways

WorkFlow区别：

http://hi.baidu.com/jakmax/item/25cbe5492e62550a6cc2f00d