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Re^4: Serialise to binary?

by davido (Cardinal)
on Oct 27, 2015 at 02:56 UTC ( #1146049=note: print w/replies, xml ) Need Help??


in reply to Re^3: Serialise to binary?
in thread Serialise to binary?

Thanks for jumping into the discussion! :) It's always great to hear from a maintainer.

I'm curious why BSON may not be the right choice. If passing a raw scalar or array is problematic, wouldn't this be a reasonable solution?

encode({data => $some_scalar});

Whether $some_scalar contains an array ref, a hash ref, or a flat scalar, encode would still see it as a hash based document.

But I don't have a lot of experience with BSON. I remember seeing it presented a few years ago at a PerlMongers meeting in So. Cal, and it stuck in my head as a more portable solution for data serialization when the data might contain binary elements.

I was a little surprised to see that there is no (documented) "TO_BSON" means of providing serialization procedures for objects. Is there any plan for that sort of hook in the future?

(Sorry to hijack the thread!)


Dave

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Re^5: Serialise to binary?
by xdg (Monsignor) on Nov 04, 2015 at 14:51 UTC

    Wrapping an array in a hash adds some mild overhead, but otherwise should work. Unfortunately, for historical reasons, the spec for arrays in BSON is horribly inefficient (index-value pairs!) so I would not recommend it for storing large arrays.

    I have been considering supporting a TO_BSON method (or even just using TO_JSON, but don't want to do that until I have a broader think about the general case of mappings to and from BSON. (If you think about how JSON::XS is using Types::Serialiser, you can see the general case problem.)

    -xdg

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