Re^6: Hooks like Storable for Dumper?

I like it. Among other things, it might allow one serializer to fall back to another. E.g. if YAML doesn't find a freezer defined for it, it could theoretically fall back to DDS.

The only other way that I think might make sense is for a package to have the hash, e.g.

our %FREEZE_THAW_FOR;
%FREEZE_THAW_FOR{ "Data::Dump::Streamer" } = [ 'foo', '->bar' ];
%FREEZE_THAW_FOR{ "Data::Dumper" } = [ 'foo', 'bar' ];
%FREEZE_THAW_FOR{ "YAML" } = [ 'foo', 'bar' ];
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It all amounts to the same thing really -- mapping between packages and serializers in some package variable space. I think I moderately prefer your approach, though a part of me is leery of the globals either way. Seems like there ought to be a better way -- maybe a third party module that packages can register with and serializers can query, but then you wind up in dependency hell.

I think the KISS and YAGNI principles would suggest doing it your way.

-xdg

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Comment on Re^6: Hooks like Storable for Dumper? Download Code

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Re^7: Hooks like Storable for Dumper? by demerphq (Chancellor) on Jan 03, 2006 at 19:20 UTC
I think I moderately prefer your approach, though a part of me is leery of the globals either way. I agree. In general I'm leery of the globals too.* I would like to know why you moderately prefer my approach as your reversal hadn't occured to me at all and I'm wondering what tilts you in the direction of my proposal. * Globals have the advantage that you can use local on them to affect dynamic changes. For instance to resolve one of your issues from another part of this thread you could create a wrapper sub that localizes $Data::Dumper::Freeze and $Data::Dumper::Thaw before calling into Data::Dumper. Using a pure object approach (like DDS) means that you have to have seperate serialization objects, which in turn makes it difficult to "override" a default set of properties for a limited duration. Anyway, I apologise for the digression, I just thought I should use this chance to explain why I think that Data::Dumper's dynamic var approach actually makes sense. (Even though at first glance it doesnt :-) --- $world=~s/war/peace/g	[reply]
Re^8: Hooks like Storable for Dumper? by xdg (Monsignor) on Jan 03, 2006 at 20:13 UTC
I'm wondering what tilts you in the direction of my proposal. Off the cuff: Not having to worry about `strict` or `use vars` or `our` and backwards compatibility. Your approach just explicitly forces fully qualified names. External fully-qualified names makes it clear where the mappings are used. I think that will help those maintaining the code follow the action. Doesn't pollute the package namespace with a special variable the package doesn't even use itself. (Regarding globals and local: Yes, indeed. Have you seen Object::LocalVars?) -xdg Code written by xdg and posted on PerlMonks is public domain. It is provided as is with no warranties, express or implied, of any kind. Posted code may not have been tested. Use of posted code is at your own risk.	[reply] [d/l] [select]