接口系统对于异常的处理 (exceptions in web interface design)

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目前对于异常有两种处理: (there're 2 ways for exception process ) 

1. 不处理。 直接抛出。让客户能看到,方便开发人员的处理。 典型的是使用exception_notification 这样的插件, 遇到异常,直接给开发人员邮件。  ( just throw it so that developers could find what is happening very easily. in Rails 3, we use a rubygem named 'exception notification' ) 

2. 处理这个异常。把它进行 begin... rescue (ruby ) 或者 try...catch (java) 这样的处理。 但是要记得把错误记录在日志中。   ( in ruby, we use begin/rescue and in java: try/catch block to make sure there's no error when exception thrown. but remember to log the errors into file ) 

方案1 适合低访问量的网站。  因为优酷的访问量非常大,目前是每秒100个请求,所以一旦出错,每秒就发送x个邮件。对系统的资源影响很大。 所以第二个方案在这个情况下就特别合适了。  ( plan 1 fits the websites that don't have huge visitors, because when exception thrown, the server would send many many emails per second which costs heavy system resources. so plan 2 is our choice , especially in youku.com, we have at least 100 req/s.  ) 

如果一旦使用了方案2, 要记得给出假数据。  保证客户端有内容可以取到。 

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