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Re^2: How can I (safely) use packages of the same name but different versions?

by Errto (Vicar)
on Mar 12, 2008 at 16:05 UTC ( #673763=note: print w/replies, xml ) Need Help??

in reply to Re: How can I (safely) use packages of the same name but different versions?
in thread How can I (safely) use packages of the same name but different versions?

I don't know anything about xevian's situation, but one place where I can see something kind of like this come up is when there are backward compatibility problems. For example, let's say DBD::XYZ version 1 only supports XYZ database version 1, whereas DBD::XYZ version 2 only supports XYZ database version 2. If your code, for whatever reason, might have to connect to instances of different versions of XYZ within a single program, you're going to have a problem.

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Re^3: How can I (safely) use packages of the same name but different versions?
by samtregar (Abbot) on Mar 12, 2008 at 16:08 UTC
    I've heard rumors that Perl 6 will solve this problem. Personally I don't think it's going to be all that helpful. New versions are released for a reason - leaving old code using old versions of their dependencies is only going to get you so far. Your example is a good one - if XYZ v1 and v2 are both being used to access the same physical database then you've likely got a problem that Perl alone supporting multiple version loading can't solve.

    I haven't had a chance to try it yet, but I thought Erlang's facility for running multiple versions of code long enough to do a seemless cut-over sounded smart. Since everything in Erlang is a networked server the system starts up the new version and starts sending all new requests to it. Once the old version is done handling any lingering requests it gets shutdown.


      The database thing happens to be a non-hypothetical question for me. I'm not giving details because my actual situation involves Java, not Perl, but the concept is the same.

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[1nickt]: I miss the days when you could customize every aspect of your PC on the Dell site.
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