RE: thread-saftey of application-instantiated components
Typically you would have something like this in your cfcs: [actual implementation] Using is good way to do it, but that will limit application scalability. Tero Pikala -Original Message- From: James Holmes [mailto:[EMAIL PROTECTED] Sent: 01 February 2007 13:22 To: CF-Talk Subject: Re: thread-saftey of application-instantiated components Yes, the separate calls could get inconsistent data. This is what the CFLOCK tag is for. On 2/1/07, Leitch, Oblio <[EMAIL PROTECTED]> wrote: > If I create a component (potentially long-running) and instantiate it > into the application scope (so all pages can access it), how thread-safe > will it be? That is, if two pages call it simultaneously is there any > chance one will get the results of the other? Or maybe I'm being > paranoid and don't understand what "thread-safe" really means or where > it's a concern? -- CFAJAX docs and other useful articles: http://www.bifrost.com.au/blog/ ~| Upgrade to Adobe ColdFusion MX7 Experience Flex 2 & MX7 integration & create powerful cross-platform RIAs http:http://ad.doubleclick.net/clk;56760587;14748456;a?http://www.adobe.com/products/coldfusion/flex2/?sdid=LVNU Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:268322 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4
RE: thread-saftey of application-instantiated components
> Yes, the separate calls could get inconsistent data. This is what the > CFLOCK tag is for. This is true only if the method is calling / using instance data. Rich Kroll ~| Upgrade to Adobe ColdFusion MX7 Experience Flex 2 & MX7 integration & create powerful cross-platform RIAs http:http://ad.doubleclick.net/clk;56760587;14748456;a?http://www.adobe.com/products/coldfusion/flex2/?sdid=LVNU Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:268314 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
RE: thread-saftey of application-instantiated components
There is the possibility for race conditions, so it depends what your component is doing. If your component has the following method: This method in an application scoped component is thread safe. There is no instance data that could change for each request. But this method is not thread safe: Thread safety becomes an issue when you are dealing with instance data within the component (the variables scope) that could change based on the actions of a different request. In cases like this you would need to lock the transaction just as you would any other shared scope variable. HTH, Rich Kroll ~| Upgrade to Adobe ColdFusion MX7 Experience Flex 2 & MX7 integration & create powerful cross-platform RIAs http:http://ad.doubleclick.net/clk;56760587;14748456;a?http://www.adobe.com/products/coldfusion/flex2/?sdid=LVNU Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:268313 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
Re: thread-saftey of application-instantiated components
Yes, the separate calls could get inconsistent data. This is what the CFLOCK tag is for. On 2/1/07, Leitch, Oblio <[EMAIL PROTECTED]> wrote: > If I create a component (potentially long-running) and instantiate it > into the application scope (so all pages can access it), how thread-safe > will it be? That is, if two pages call it simultaneously is there any > chance one will get the results of the other? Or maybe I'm being > paranoid and don't understand what "thread-safe" really means or where > it's a concern? -- CFAJAX docs and other useful articles: http://www.bifrost.com.au/blog/ ~| Upgrade to Adobe ColdFusion MX7 Experience Flex 2 & MX7 integration & create powerful cross-platform RIAs http:http://ad.doubleclick.net/clk;56760587;14748456;a?http://www.adobe.com/products/coldfusion/flex2/?sdid=LVNU Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:268310 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
