Split packages across artifacts
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Key: AVRO-735
URL: https://issues.apache.org/jira/browse/AVRO-735
Project: Avro
Issue Type: Bug
Components: java
Affects Versions: 1.5.0
Reporter: Holger Hoffstätte
Fix For: 1.5.0
I was glad to see the ongoing work for a more modular build (thanks Scott
Carey!). Whilst looking into the cross-platform IPC facilities for use in OSGi
I noticed something that makes OSGi compatibility (and maintenance) more
difficult than necessary, for no good reason. I plan to submit OSGi bundle
patches later (though not necessarily for the 1.5.0 release) so this is a
necessary prelude.
The term "split packages" refers to the situation that two artifacts carry the
same packages, which means that the classes in both packages are more or less
randomly munged together at runtime. This unfortunate situation is "mostly"
without consequence in "normal" flat-classpath Java (assuming there are no
overlaps!), but bad for OSGi since class visibility & wiring is based on
package visibility. Split packages generally make any form of automatic package
resolution (for deployment) almost impossible.
As far as I can see there are several classes in packages across artifacts that
can easily be moved a bit without really disturbing anything. Some examples:
org.apache.avro.specific is defined by acro, compiler AND ipc
org.apache.avro.ipc (!) is defined in avro and contains classes that could go
into avro:avro.io (the buffers) or avro-ipc:org.apache.avro.ipc
It seems that the previously unmodular package membership of classes has been
carried over during the artifact separation. I'd like to see this cleaned up as
well before the 1.5.0 release, as this is a breaking change. However, most of
the overlaps can be fixed easily with IDE refactorings like package renaming or
by moving classes.
Please let me know if this is an acceptable change and if you want me to
provide help/patches etc.
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