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From "Peter Firmstone (JIRA)" <j...@apache.org>
Subject [jira] Updated: (RIVER-316) RFC Library, Application & Class Versioning, Dynamically Mobile Codebases and Classloading enhancements
Date Tue, 25 Aug 2009 11:45:59 GMT

     [ https://issues.apache.org/jira/browse/RIVER-316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Peter Firmstone updated RIVER-316:
----------------------------------

    Attachment: VersionedDynamicClassesRev8.tgz

Some interface refactoring, more needed of course.  I've pilfered the Dynamic Proxy from Harmony's
java.lang.reflect package along with the test cases, the tests are passing, ready for modification.
 Harmony's Proxy will be modified to support the new Delegate for Evolving Objects, such that
the Delegate can be generated dynamically as well as control the synchronization policies
 (ClassUpgradePolicy) during the Package upgrade process.

I'm now wondering how to inject the Exporter interface into the Proxy as well, for Remote
Proxy's & Stub's

>From there I'll look at concurrency support in Classworlds and how to implement the codebase
service and dependency analysis.

Cheers,

Peter.

> RFC Library, Application & Class Versioning, Dynamically Mobile Codebases and Classloading
enhancements
> -------------------------------------------------------------------------------------------------------
>
>                 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
>         Attachments: classworlds-1.0-src.zip, Java Classloader issues relating to Jini
smli_tr-2006-149.pdf, VersionedDynamicClassesRev6.tgz, VersionedDynamicClassesRev7.tgz, VersionedDynamicClassesRev8.tgz
>
>
> Request for Comments:
> Proposal to add support for Dynamic Mobile Codebases and Application fine grained class
versioning as well as Coarse grained Library 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.  ClassWorlds can be used to segregate
ClassRealms for application packages and different library versions.
> 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 LIBRARYVERSIONID static final 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 CLASSVERSION static field, 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 CLASSVERSION, fully qualified
class name and class file checksum.

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