On 07/12/11 09:52, Daniel Barrett wrote:
> Tim Starling writes:
>> You can add or modify messages when the cache is built by
>> hooking LocalisationCacheRecache, and you can add a cache
>> dependency to trigger a rebuild by adding elements to
>> $allData['deps'].
> 
> Thanks.  Do I need to do both, or is this an either/or choice?

You don't need to add the cache dependency if the message only changes
when the *.i18n.php or Messages*.php files change. It sounds like
that's the case for your extension.

>> What extension is this for?
> 
> A parser tag extension (unreleased) that hits a SQL Server database
> to retrieve data. The parser tag dynamically categorizes its
> calling articles in "Category:Pages that hit SQL Server databases"
> for our bookkeeping purposes (and our DBA staff). To make this
> flexible, the extension doesn't insert a category tag directly, but
> transcludes a system message that contains the category tag. (This
> way we can change the category tag by editing the system message,
> rather than modifying PHP code.)  That's where we're calling
> $wgMessageCache->addMessage().

You should have a look at how tracking categories work in the core,
see Parser::addTrackingCategory(). It's not necessary to add any text
to the page if there's a parser function on the page, the parser
function can register the category directly in the output object.

-- Tim Starling


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