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From Donald McLean <dmclea...@gmail.com>
Subject Re: Full roaming vapor embedded server
Date Fri, 21 May 2010 23:58:02 GMT
Have each process "register" in a table set aside for that purpose. As
each process completes, the last thing it does is "unregister". Last
process to finish shuts down the database.

Just a thought.


On Fri, May 21, 2010 at 5:07 PM, Kathey Marsden
<kmarsdenderby@sbcglobal.net> wrote:
> I hope this doesn't give  anyone else similar ideas, but I need some advice
> :-)
> I am trying to help the developers of a Java API  that  uses a Derby
> database to hold centralized information specific to a machine.
> The API gets invoked when products are being installed or upgraded on the
> machine and records product information, versions, dependencies, etc,  but
> otherwise they don't want it to run.
> They have a requirement for multiple jvm access, primarily for nested
> installs where one product installation accesses the database and needs to
> launch a child process to install another product.    Their implementation
> starts network server on-demand if it is not started already and then
> connects with the client driver. Additional processes that come in will
> check and find network server running elsewhere so will just connect to the
> already the started server.   They think the "parent" process will always
> come in first, so there is not a risk of one process bringing network server
> down in the middle of someone else's work.
> This all seems very fragile to me and is a new and untested configuration,
> but I am having trouble coming up with a good design suggestion.  They at
> one time tried a service but do not want the full time overhead of a server
> running and don't want to require root access to start the service.
> Any other ideas?
> Thanks
> Kathey

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