Apache OpenOffice Wiki - User contributions [en]

Writer/ToDo/Writer Refactoring/Writer Refactoring

2006-05-01T17:22:50Z

1146504737:

== Caution ==
This page is still under construction hence the content is still very tentative.

== Problem statement ==

As Bertrand Meyer [1] describes external software qualities (experienced by the user of the software) like
* Correctness - The ability of software products to perform their exact tasks, as defined by their specification.
* Robustness - The ability of software systems to react appropriately to abnormal conditions.
* Efficiency - The ability of a software system to place as few as possible demands on hardware resources, such as processor time, space occupied etc.
for instances are in direct relation to internal software qualities (experienced only by computer professionals with access to the source code of the
software) like modularity, testability, maintainability.

The current Writer code base has some serious quality problems with regards to these internal software qualities what consequently leads to external quality problems like crash reports, malfunctions, performance problems, memory leaks. See [2] for some concrete examples otherwise use [http://www.openoffice.org/issues/query.cgi IssueZilla] and search for defects in OOo Writer.

Some facts and numbers about the writer code and and the code quality (still) in random order

* Build time - to build the Writer from scratch takes
* Link time dependencies - linking the Writer roughly takes x minutes on a
* Code not testable because of cyclic dependencies
* No unit tests available - Until milestone SRC680m147 there exist not a single unti test for the Writer code
* Code optimized for legacy computer systems e.g. Win16 - Example: BigPtrArray (see sw/source/core/bastyp/bparr.cxx)
* Redundant code
* Big and complex classes with multiple responsibilities - Example: SwDoc
* No clearly designed and documented interfaces and abstractions
* Hand crafted data structures (no STL)
* Unwanted dependencies between UI, Core, Layout
* Fragile code (Undo, Redlining, ...)
* Base classes without virtual destructor
* Single argument constructors are not declared 'explicit'
* Wrong initialization sequence of class members
* Lack of documentation
* Duplicate code - Using CPD [3] with a minimum token count of 100 on SRC680m156 'sw/source' leads to the following results: 11324 duplicate lines of roughly 739620 overall lines of code which nearly amounts to ~1.53% duplicate code.

== Goal statement ==

* Prioritize problems
* Break problems into pieces <= 3 man months

== Steps ==
On cws [http://eis.services.openoffice.org/EIS2/servlet/cws.ShowCWS?Id=3189&Path=SRC680%2Fmacosx20xfixes01 writercorerefactoring] the
following steps are planned:
* Removal of unused files
'''Status:''' done '''Details:''' 19 files which were not build anymore have been removed
* Removal of unnecessary includes of headers
'''Status:'' done '''Details:'' 850 unnecessary includes of header files have been removed in the Writer code base
* Removal of unused/inactive code (how many lines?)
'''Status:''' in progress '''Details:''' There is a lot of code commented out via #if 0 ... #endif, /* */, or no longer used defines e.g. 'JAVASCRIPT'.
'''Reason:''' Inactive code is a unnecessary burden and often confuses potential maintainer of the code.
* Minimize code duplication
'''Status:''' new '''Details:''' Using CPD [3] with a minimum token count of 100 on SRC680m156 'sw/source' leads
to the following results: 11324 duplicate lines of code of roughly 739620 overall lines of code which nearly amounts to
~1.53% duplicate code. '''Reason''' Less duplicate code means less code to maintain. Bugs in duplicated code need
to be fixed in all duplicate places which are hard to detect without the help of tools, so less duplicate code means
fewer redundant sources of bugs.
* Write unit test
'''Status:''' in progress '''Details:''' 1 unit test for BigPtrArray has been introduced
* Make SwDoc interface based, changes clients of SwDoc to just include the header files for these interfaces instead of the whole doc.hxx
'''Goal:''' Reduce unnecessary build time dependencies, first step to break SwDoc into managable and testable pieces
'''Status:''' in progress
'''Details:''' SwDoc (see sw/inc/doc.hxx) is a huge class with more than 130 data members and hundreds of member functions. This class
has mutliple responsibilities this implies that SwDoc has a lot of different clients. Each of these clients usually requires just a small part
of the SwDoc interface. With SRC680m146 434 of 763 source code files directly or indirectly include doc.hxx in which the interface of
SwDoc is declared. This results in undesirable build times when changing doc.hxx.
X Interfaces for SwDoc have been introduced related code has been changed to use these interfaces instead of the whole doc.hxx

* Replace Writer only OLE objects with Draw OLE objects
* Replace hand-made bulk data types with STL means (e.g. BigPtrArray, SvPtrArr)

== References ==
[1] Betrand Meyer, [http://www.amazon.com/gp/product/0136291554/qid=1135936830/sr=8-1/ref=pd_bbs_1/002-2294048-8616869?n=507846&s=books&v=glance Object Oriented Software Construction], ISBN: 0-13-629155-4

[2] Long existing, hard to fix quality problems in OOo Writer (to be extended)
* Cannot select whole document when table is at beginning
* Backspace may take several seconds in documents with many hidden redlines
* Undo-delete still doesn't work in all circumstances (section-to-section)

[3] Copy Past Detector (CPD) http://pmd.sourceforge.net/cpd.html

[[Category:Development]]
[[Category:Writer issues]]

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OpenOffice.org Developer Article Contest

2006-05-01T17:21:59Z

1146504737:

== Contest Overview ==

'''OpenOffice.org Developer Article Contest starts on February 1, 2006'''

Dear developers and technical writers,

OpenOffice.org, with the support of Team OpenOffice.org e.V. and extra sponsorship from Sun Microsystems, announces its first Developer Contest starting February 1, 2006. The goal of the developer contest is to generate more developer documentation. We are also interested in promoting OpenOffice.org to developers at the same time.

As part of the contest, developers are asked to write articles about developer topics, such as porting, add-on and filter development (e.g. new wizards, Calc functions, chart types, etc.), bug fixing, etc. Every month a committee will pick the best article from the pool of submitted articles. Articles that did not initially win will stay in the pool, so that they can still win later.

Detailed rules can be found here: http://wiki.services.openoffice.org/wiki/OpenOffice.org_Developer_Article_Contest

The developer contest team wishes all participating developers and writers good luck! We look forward to receiving the first articles.

Best regards,

The OpenOffice.org Developer Contest Team

__TOC__

==Winners==

February 2006 : '''Cedric Bosdonnat - "[[JavaEclipseTuto|UNO Java component creation explained]]"'''

==Submitted Articles==

[[Theses articles]] have been submitted the past months and are still in competition

== Contest Rules ==

===What are the main goals of the contest?===
The goal of the contest is to generate more developer documentation,
and to promote OpenOffice.org to developers at the same time.

===What is the task of the contest?===
Developers are asked to write articles about developer topics like
porting, addon and filter development (e.g. new wizards, Calc
functions, chart types, etc.), bug fixing, etc.

===What can be won?===
Each winner gets $750. The money will be transferred preferably via PayPal, or via bank transfer otherwise.

===What criteria do articles have to meet to get accepted?===
A submitted article has to have at least 1,200 words (about three pages
of text) excluding embedded source code snippets and screenshots.
Only articles written in English can be accepted. However, teams
can submit articles together, so that one developer can create the
content and someone else can translate it to English.
Submissions have to be sent as attachments in the OASIS OpenDocument file format
to the mailing list
contest@development.openoffice.org on or before the
submission deadline date. Only content that has been created
AFTER the start date of the contest can be submitted, e.g.
old articles and blog entries cannot be used.
Finally, developers who want to participate in the contest have to
be o.k. with the licensing terms of the
[http://www.openoffice.org/FAQs/faq-licensing.html JCA and PDL] since
the article content will be published on OpenOffice.org under these terms.

===What criteria will be used to choose a winner?===

There will be no 100% scientific and measurable criteria. Instead,
the selection committee will choose a winner based on their
preferences. Nevertheless, the following criteria will influence
the chances of winning:

* relevance to developers
* existing and urgent gaps
* "cool stuff"
* amount of sample code
* comprehensibility
* length (not too long, not too short)
* illustrations (screenshots, diagrams)
* enables new developers
* etc. etc. etc.

For entering the contest it does not matter what tools (e.g. NetBeans, Eclipse,
Microsoft Visual Studio, Borland Delphi, etc.) or programming languages
(e.g. C++, Java, Python, Perl, etc.) are used. However, a broad availability
to the technologies will increase the attractiveness of a submission article
since more developers will be able to take advantage of the article content.

===What will be done with the articles?===
Every month a committee will pick the best article from the pool of
articles. Articles which did not win initially, will stay in the pool,
so that they can still win in subsequent months.

ALL submitted articles will get published no matter if they have already
won or not. Once the deadline has been reached, all articles submitted
in that period will get published to wiki.services.openoffice.org under
the PDL and the JCA, so that developers will immediately be able to
benefit from the submitted content. Nevertheless, the selection committee
will make its decisions based on the original content submitted to the
submission mailing list.

Authors will still be allowed to use the article content somewhere else,
e.g. for a magazine, book or personal web site. If you have a publication
in mind, please check with the publisher upfront whether they will
still accept an already published article or not.

===Who can participate?===
Everybody who is not a member of the selection committee can
participate in the contest. If someone wins in one period he/she has
to stay out of the contest for the following three periods.

===Who is running the contest?===
OpenOffice.org with the support of Team OpenOffice.org e.V. and
extra sponsorship from Sun Microsystems are running the Developer
Article Contest.

===Who is in the selection committee?===
The selection committee consists of at least 10 and no more
than 15 people. Initially, the following people will be in the
selection committee:

* Jürgen Schmidt
* Stephan Bergmann
* Andreas Schlüns
* Carsten Driesner
* Pavel Janík
* Kurt Cagle
* Kay Ramme
* Michael Meeks
* Charles-H. Schulz
* Stefan Taxhet
* Erwin Tenhumberg
* Laurent Godard

Someone who has won the contest cannot win in the contest again
for the following three periods. However, the winner can, if he/she
is willing to, become a member of the selection committee for
three periods.

===How will the winner be determined by the selection committee?===
The number of votes that each selection committee member gets is
one third of the total number of articles in the pool in a given
month (the closest integer value). Thus, if 29 articles are
in the pool, each selection committee member gets 10 votes. Each
article can get only one vote per selection committee member, i.e.
an article cannot receive two votes from the same committe member.
At least 70% of the selection committe members must have voted.
The article with the most votes wins. If two or more articles
get the same number of votes, the article submitted first wins.
The time and date as listed in the email archives will be used
as the basis for the decision. The votes are reset to zero for
each contest period.

===When will the contest start?===
The first round of the contest ended on February 28. The second round started on March 1, 2006 and will end on March 31, 2006.

===When will the contest end?===
The contest will at least run for six months. Depending on the
success, it might get extended to twelve months.

===How often will a winner be selected?===
A winner will be selected for every month. The announcement
of the winner will happen in the second half of the month for
the previous month. For example, the first contest period
started on February 1 and ended on February 28 (the submission
deadline). The winner for February will be announced after
March 15, but before April 1.

===When is the deadline for every contest period?===
The deadline for every contest period, i.e. every month, is the
last day of the month (12am Pacific time of the first day of
the following month). Thus, for the March contest period the
last possible submission day is March 31, 2006.
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