Looks great Alex,

One question; Adding a scope or a multiplier is featured on the wiki
but not specified. Can you add a pointer to it?

Very nice indeed,
Daan

On Mon, Sep 9, 2013 at 7:20 PM, Alex Huang <alex.hu...@citrix.com> wrote:
> As part of the work to pull apart orchestration from self service, I made 
> some changes to how configuration parameters work.  The problem with the 
> current system are as follows:
>
> - configuration variables are all stored as enums in Config.java which means 
> plugins have to modify a single file.  We established that to be a bad 
> pattern in some earlier thread.
> - No way to tell during upgrades whether a config variable has become useless 
> or if the defaults have changed.
> - No way to consistently have variables be dynamically updated.
> - No way to consistently migrate a global variable to a scoped variable.
> - No way to use more than one type of storage (db) to store config variables.
> - Some of the code are still using text strings to retrieve configuration.
> - No way to consistently validate variables.  (although this is not done yet 
> but I described how it can be done in this new framework.)
>
> The changes are detailed on wiki [1].  There's a detail list of todo items in 
> ConfigDepotImpl.java if you're interested in picking up any of the work.  The 
> old way still works but I recommend we move all new way for new config 
> parameters.
>
> If everyone reviewed it all and like how it works then we can remove the old 
> way of how it all works.
>
> --Alex
> [1] https://cwiki.apache.org/confluence/display/CLOUDSTACK/Configuration

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