Re: How do I prevent two calls concurrently?

[Manos Batsis <ma...@geekologue.com>]

Givler, Eric wrote:
> The problem is the
> user double clicks [login] and can get two calls to the service method
> to execute simultaneously.  They both don't see a row, so they both do
> an INSERT.  One of the inserts fails due to a PK on the username.  



See generateToken[1] and isTokenValid [2]. The token will be valid for 
only one request. What to do with the invalid request (also the latest) 
is up to you.

[1] 
http://struts.apache.org/1.x/apidocs/org/apache/struts/action/Action.html#generateToken(javax.servlet.http.HttpServletRequest)
[2] 
http://struts.apache.org/1.x/apidocs/org/apache/struts/action/Action.html#isTokenValid(javax.servlet.http.HttpServletRequest)

Cheers,

Manos

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