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Date: Sat, 3 Apr 2010 23:44:05 +0800
Message-ID: <v2x2cde31751004030844u287eb44aq904adbfc760f3db6@mail.gmail.com>
Subject: Re: [GSoC] Proposal for HARMONY-6457
From: Daniel Gong <daniel.gong.fudan@gmail.com>
To: dev@harmony.apache.org
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Thanks Jimmy, I'll surely discuss directly with Sean as well :)

Best wishes
Daniel Gong


On Sat, Apr 3, 2010 at 10:55 PM, Jing Lv <purefirestudio@gmail.com> wrote:

> Hi Daniel,
>
>     That is great. Welcome!
>     And I believe you can discuss directly with the project mentor as well,
> which will be more efficient and help you understand the problem better.
>
> 2010/4/3 Daniel Gong <daniel.gong.fudan@gmail.com>
>
> > Hello everyone,
> >
> >    Last year I've worked as a gsoc student in Harmony and learned a lot
> > during the project. I'm eager to participate gsoc 2010 and looking
> forward
> > to working in Harmony as well :)
> >
> >    I've submit my proposal to the gsoc project website. For your
> > convenience, I'd like to post it here and discuss it with you. I've
> skimmed
> > through the document of JPDA and I'm currently read some jdwp source code
> > to
> > get familiar with the logging system.
> >
> > =====================================================================
> >
> > *Student Name:*
> >
> > Linghui Gong
> >
> > *Student E-mail:*
> >
> > daniel.gong.fudan@gmail.com
> >
> > *Student Major:*
> >
> > Computer Science
> >
> > *Student Degree:*
> >
> > Studying for Master of Science Degree, 2nd year
> >
> > *Organization/Project:*
> >
> > Harmony Project, The Apache Software Foundation
> >
> > *Assigned Mentor:*
> >
> > Sean Qiu
> >
> > *Proposal Abstract:*
> >
> > The aim of the project is trying to enhance harmony's jdwp log system to
> > facilitate jdwp debugging by adding support of thread information and
> > implementing a log analyzer to sort log messages according to user
> demands
> > and find out bug-prone message.
> >
> > *Detailed Description:*
> >
> > Harmony current JDWP agent have full logging functionality. But all log
> > messages are messed up regardless of its running thread information.
> >
> > On the other hand, Harmony JDWP support a lot of types log level, user
> need
> > to rerun the appilcation to get different type of log. It would be much
> > convenient if we have a log analyzer to help sort out log messages, then
> we
> > can only need get the all log message.
> >
> > This project should include the following steps:
> > 1. Modify the jdwp agent code to support thread information in the log.
> > 2. Implement a log analyzer that can sort out different kind of log
> > messages
> > according to user demands.
> > 3. Improve the log analyzer to make it enable to analyze the log message
> > sequence with context and find out bug-prone log message.
> >
> > I've read part of the jdwp source code and I believe the first two steps
> > are
> > not difficult to implement. The last step is a challenging one.
> >
> > In my understanding, some messages may be judged as bug-prone one only
> with
> > information from itself and others may need context to decide, which
> > indicates that sequence analysis should be included in the analyzer.
> > Methods
> > such as rule-based classification or heuristic pattern recognition can be
> > employed to accomplish the task. In my experience, I've used
> > CRF(Conditional
> > Random Fields) to analyze sentences and tag words and phrases. It works
> > well. However, currently I'm not very sure that this is the best choice
> for
> > this project. Several literature I've read claimed that rule-based
> > classification costs less but is more adjustable and gives decent result.
> I
> > need to do more investigating.
> >
> > *Draft Timeline*
> >
> >   - Week 1      Read and understand the JDWP logging related code;
> >   - Week 2      Read and get familiar with the JDWP and JVMTI document;
> >   - Week 3-4   Complete the thread information support;
> >   - Week 5-6   Implement the log analyzer initial version with log
> sorting
> >   functionality;
> >   - Week 7-10  Add the bug-prone message judgement functionality to the
> >   analyzer;
> >   - Week 11    Fix all bugs left and complete the documentian work.
> >
> > *Available Time*
> >
> >   - Generally, I have 14~16 hours per week in average guaranteed working
> on
> >   the subject.
> >   - I'm a 2nd year graduate student and do not have any classes or exams
> to
> >   attend, which allow me to have enough time to complete the project.
> >
> >  *Additional Information:*
> >
> > I've been learning and using Java since 4 years ago. In the past I've
> > complete several projects based on java, including a mini library
> > management
> > system, a text stream clustering system, a search engine project based on
> > Apache Lucene. I've got rich experience of Java language, programming and
> > debugging from them.
> >
> > Last year I've participated in Google Summer of Code and successfully
> > accomplished the harmony-classes-selector project of Harmony under the
> > mentoring of Regis. In the project, I came across JVMTI in the first time
> > and built an agent for the project. As a result, I became very interested
> > in
> > Java runtime technology and I've learned and got to know more knowledge
> in
> > this area including Java class file format, instrumentation, JPDA and so
> > on.
> >
> > I believe these professional knowledge and my other knowledge in
> > programming
> > and software architecture can help me to learn fast and handle the
> problem.
> >
> > I'm 24 years old, living in Shanghai, China, studying in Fudan
> University.
> >
> > =====================================================================
> > Thanks for your attention!
> >
> > Best wishes
> > Daniel Gong
> >
>
>
>
> --
> Best Regards,
> --------------------
> Lv Jing
> Apache Harmony PMC
> IBM CDL
>

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