Reloading a changed stack file

[Björnke von Gierke]

Try the revert command, it's perfect for this, assuming you do replace  
the stacks on the hard disk, and are not creating new files.

On 28 Sep 2008, at 14:31, Len Morgan wrote:

> I'm back again with an "autoupdater" question.  I have an  
> application that is made up of a bunch of stacks.  Each stack as a  
> custom property cstkVersion that carries the current version number  
> of that stack.  On my server, I have the latest versions of all the  
> stacks and a text file that contains lines of the form:
> stackfilename,stackversion
>
> I have one "get the ball rolling stack" that checks itself against  
> the latest version and then downloads the latest version if the  
> versions are different.  This part seems to be working fine although  
> I do require the user to quit the program and restart it if it has  
> been updated.  This whole process is started up by a stand-alone  
> that launches this first stack and is simple enough that the stand- 
> alone should only require changing when the engine changes.
>
> Now to the "real" problem/question: As I'm going through my text  
> file of stack names/versions, I have to check the cstkVersion  
> property of each stack on the user's hard drive against the version  
> listed in the text file.  In order to read the property, the stack  
> has to be loaded into memory.  My problem is how to I get rid of  
> this in-memory copy and replace it with the new version (assuming  
> that I had to download a new version)?
>
> Is it as simple as:
>
> if tVersionUpdated then
>   stop using tCurrentStack
> end if
>
> and then when I really need the stack, another "start using  
> stack ..." ?
>
> The documentation for "reload stack" indicates that this is used to  
> prevent two stacks with the same name being loaded at the same  
> time.  If I don't pass the message on, I'll have the old and the new  
> stack in memory at the same time.  I understand how this might cause  
> problems.  If I pass the message on, what happens?  Does it purge  
> the current version from memory and then load the new one?  Does it  
> throw and error?  Does it go ahead and load the new version too and  
> then decide which one messages will be sent to?
>
> Is there another command or function that will purge the stack  
> currently in memory and reload the new and improved version from disk?
>
> Thanks for any clarity you can provide.
>
> len morgan
>
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