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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