Re: get_handlers and set_handlers - purpose and use cases?

On Tue, Mar 23, 2010 at 2:54 PM, Michael Ludwig <[email protected]> wrote:
>  # A list of handlers configured to run at the response phase:
>  my @handlers = @{ $r->get_handlers('PerlResponseHandler') || [] };
>
> Now what do I do with that bunch of code references? I think there might
> be something useful about this that escapes me.

If you want to know what handlers are set to run for the current
request, this is how you find out.

> Almost the same story for set_handlers: Do people use this to
> dynamically reconfigure their server? Could it be used to dynamically
> take a handler out of service once a certain error condition is met
> with, like, say, a Berkeley database in need of recovery (which requires
> single-threaded access to perform), or a search engine backend having
> become irresponsive?

More likely you would use them to do your own dispatch of some kind
where you choose between multiple possible handlers based on something
about the request.

> What have you used these functions for in real code?

Sometimes people use them to tell apache to handle a certain request
as a static file and skip the mod_perl response handler that would
normally be configured for the URI.

- Perrin