Re: [p2-dev] Version Type Proposal

[John Arthorne <John_Arthorne@xxxxxxxxxx>]

Hi Henrik,

The proposal looks good - well thought
out and staged. Some questions/comments:

We use Version/VersionRange in many
different places in p2, so it would be good to clarify where this generalization
is needed. Obviously you are interested in IInstallableUnit/RequiredCapability/ProvidedCapability,
but there are many other areas as well:

 - File format version numbers
(content.xml, artifact.xml, etc)
 - UpdateDescriptor
 - Touchpoint version numbers and
touchpoint action versions
 - Publisher advice versions
 - Artifact key versions

I suspect many of these other uses wouldn't
stand to benefit much from moving to generic version types, but it's worth
clarifying the scope of the proposed changes.

What is the segment delimiter for the
"any" version type?

What kinds of methods will be on IVersion
and IVersionRange? We currently have code in various places that does range
manipulations such as union and intersection, which would become more complicated
in this world and would benefit from helper methods. Of course something
like VersionRange.isIncluded(Version) would also be needed.

We currently invoked the OSGi resolver
in a couple of places (attaching fragments, computing explanations in case
of failure, see ResolutionHelper). How will this deal with different version
schemes?

Performance is obviously a potential
concern for the pattern-based scheme. We would need to know if this will
scale to thousands or tens of thousands of IUs.

John

Henrik Lindberg <henrik.lindberg@xxxxxxxxxxxxxx>
Sent by: p2-dev-bounces@xxxxxxxxxxx

12/03/2008 10:09 AM

Please respond to
P2 developer discussions <p2-dev@xxxxxxxxxxx>

To	P2 developer discussions <p2-dev@xxxxxxxxxxx>
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Subject	[p2-dev] Version Type Proposal

Hi, in the p2 call on December 1, I promised to write
a detailed  
proposal for handling non osgi versions in p2.
The first revision of the proposal is now ready on the wiki at http://wiki.eclipse.org/Equinox/p2/Proposals/Version_Type_Proposal

Regards
Henrik Lindberg
henrik.lindberg@xxxxxxxxxxxxxx

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