它们是由应用程序配置接口生成且不应手动编辑，除非是为了重新配置而重置为空。
These are generated by the application configuration interface and should not be edited manually, except to reset to empty values for reconfiguration.
没有单点故障问题：系统中不应该存在单点，就是说不能因为一个服务器的宕机或者故障而导致整个应用程序的不可用。
No single point of failure: there should be no one server which, if lost, causes downtime of the application.
action类应该控制应用程序的流程，而不应该控制应用程序的逻辑。
The Action class should control the flow and not the logic of the application.
应用推荐