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From Charles Lee <littlee1...@gmail.com>
Subject Re: [GSoC] Questions about the Harmony class selector idea
Date Mon, 30 Mar 2009 04:45:26 GMT
Hi Qiu Yin,

Thank you for your suggestion.

The important objective of Harmony class Selector is to provide a minimal
JRE.  Follows are some good points:
1. Fast responding by dowloading the minimal size jre
2. Save resources by limiting the bandwidth
3. Enforce a good quality by requiring a sufficient tests

On Mon, Mar 30, 2009 at 12:04 PM, QIU, Yin <allenchue@gmail.com> wrote:

> Hi Harmony folks,
> I am interested in the idea of creating a minimal JRE for a Java
> application, but I have some questions about it.
> Having browsed the mail archive, I found I had similar thoughts to
> Mike's. The key to this idea is to determine the class dependencies.
> Parsing bytecode (class files or jars) would be sufficient in most
> cases, except for RTTI. It's not easy (or even impossible) for this
> static approach to find classes dependencies that emerge with
> reflection. The description of the idea, as well as the previous
> discussion on this, implies a dynamic method, which may be based on
> the instrumentation mechanism, that is, to find dependencies by
> running tests. Of course, this puts obligations on the developers to
> write tests with 100% code coverage. But it seems to be a bit
> contradictory. As harmony class selector is an *automatic* way to
> build a JRE of minimal size, the correctness of it relies strongly on
> the hypothesis that human beings make no faults.
> So my question is: What is the most important objective of Harmony
> class selector? Better code coverage or a minimal JRE? If it is the
> latter case, I would like to suggest a hybrid approach. We first parse
> the bytecode, get a preliminary class dependency graph, write specific
> programs to test RTTI-related code, and finally use instrumentation to
> find if we missed some dependencies.
> I hope I made myself clear. Any comment is greatly appreciated.
> Regards.
> --
> Yin Qiu
> Nanjing University, China

Yours sincerely,
Charles Lee

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