Re: How do I prevent two calls concurrently?
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 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How do I prevent two calls concurrently?
Eric How would I prevent this from occurring? [Questions] 1. Is it simply a matter of making my service an instance variable of this action and making the login method synchronized? 2. Are there situations where I would not want there to be a single service instance? Could it cause a bottleneck? One simple technique that has worked out well for me and will depend on your use case is to disable to login button after the first time the user clicks on it. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: How do I prevent two calls concurrently?
I don't know why I overlooked that. All I had to do was put saveToken() in a calling action, and make sure I called saveToken again if any validation or system errors occurred when I was returning to the form. If the token is invalid, There was a nice thread here about it: http://www.jguru.com/faq/view.jsp?EID=779112. Thanks and apologies for not looking at this first - I guess I was going the more difficult route. Eric -Original Message- From: Manos Batsis [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 15, 2008 10:02 AM To: Struts Users Mailing List Subject: Re: How do I prevent two calls concurrently? 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.htm l#generateToken(javax.servlet.http.HttpServletRequest) [2] http://struts.apache.org/1.x/apidocs/org/apache/struts/action/Action.htm l#isTokenValid(javax.servlet.http.HttpServletRequest) Cheers, Manos - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How do I prevent two calls concurrently?
provided if the comprehensive route is always the most difficult 2 quick questions- 1)In struts-2.0.11 has resetToken/saveToken/generateToken morphed into a different entity ? 2)can I assume a session.invalidate() will effect a resetToken Thanks/ Martin- - Original Message - From: Givler, Eric [EMAIL PROTECTED] To: Struts Users Mailing List user@struts.apache.org Sent: Tuesday, January 15, 2008 1:36 PM Subject: RE: How do I prevent two calls concurrently? I don't know why I overlooked that. All I had to do was put saveToken() in a calling action, and make sure I called saveToken again if any validation or system errors occurred when I was returning to the form. If the token is invalid, There was a nice thread here about it: http://www.jguru.com/faq/view.jsp?EID=779112. Thanks and apologies for not looking at this first - I guess I was going the more difficult route. Eric -Original Message- From: Manos Batsis [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 15, 2008 10:02 AM To: Struts Users Mailing List Subject: Re: How do I prevent two calls concurrently? 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.htm l#generateToken(javax.servlet.http.HttpServletRequest) [2] http://struts.apache.org/1.x/apidocs/org/apache/struts/action/Action.htm l#isTokenValid(javax.servlet.http.HttpServletRequest) Cheers, Manos - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
