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From Mark Hindess <mark.hind...@googlemail.com>
Subject Re: [GSoC] Proposal for HARMONY-6457
Date Sun, 04 Apr 2010 14:24:33 GMT

In message <t2lec53d1751004030755y74aad3d5sd78b3f7c6348dde8@mail.gmail.com>,
Jing Lv writes:
>
> 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.

I'd rather all technical discussion happened on the dev@ list please.
Summaries of off-list technical discussions (in person or on IM/IRC
for instance) should be posted to the dev@ list with credit to those
involved.  Then we can all understand the problem (and solution) better.

Thanks,
 Mark.

> 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
> 
> --0016e64c145a8e3233048356485b--
> 



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