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From "Peter Firmstone (JIRA)" <j...@apache.org>
Subject [jira] Created: (RIVER-316) RFC codebase versioning and Classloading enhancements for PreferredClassProvider
Date Thu, 16 Jul 2009 01:33:14 GMT
RFC codebase versioning and Classloading enhancements for PreferredClassProvider

                 Key: RIVER-316
                 URL: https://issues.apache.org/jira/browse/RIVER-316
             Project: River
          Issue Type: New Feature
          Components: net_jini_loader
         Environment: All
            Reporter: Peter Firmstone

Request for Comments:

Proposal to add support for http Codebase class versioning, to enable River User devolopers,
to provide distinction between classes with the same fully qualified class name when code
differences created by refactoring packages or library updates break backward compatibility
between classes contained within that library or package.

A dependency tree array object (contains dependency references between classes, fully qualified
class names are stored as String objects) returned by the new ClassDepend tool (replacement
of classdep functionality) may be suitable (with some modification) for recording class versioning,
for later navigation of the codebase for class version verification, perhaps this could be
stored in serialized form with the codebase.

The ASM library might be used to modify existing, externally sourced library class file bytecodes
to add a classVersionID immutable field, with an accessor method, for library code used in
codebases, to mark the class files with the library release version.

serialVersionUID (when it exists), along with the classVersionID, might be used to determine
the dependency and backward compatibility of classes in a codebase, this information could
be stored in the dependency tree along with the classVersionID and fully qualified class name.

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