carfield.com.hk: design

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Thu Apr 06 06:32:51 GMT 2023

design

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Sat Apr 23 17:07:07 GMT 2011 From /weblog/design

saga

Introduction to Saga - http://www.udidahan.com[..]sistence-and-event-driven-architectures/

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Thu Feb 10 16:48:54 GMT 2011 From /weblog/design

2 best practices of API design confilct each other, and how to find out the solution - http://martinfowler.com/bliki/ExpressionBuilder.html

What exactly simple mean? http://typo.objectmentor.com[..]s-that-pass-for-simple-i-cant-understand . In my opinions, a more concrete interpretation of simple is first define what is most important to you, then find the quickest way to get there.

Iceberg Classes, if encapsulation is good, how about having more private method? Or actually the logic should be split? - http://www.artima.com/weblogs/viewpost.jsp?thread=125574

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Mon Feb 07 16:38:32 GMT 2011 From /weblog/design/distribute

GridGain

Implement ping-pong play between two nodes on the cloud using GridGain Distributed Actors - http://gridgaintech.wordpress.com[..]11/01/26/distributed-actors-in-gridgain/

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Sat Jan 15 17:51:29 GMT 2011 From /weblog/design

testable

http://misko.hevery.com/code-reviewers-guide/

Discussion on TDD algorithm - http://css.dzone.com/articles/tdd-algorithms

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Mon Dec 13 16:57:34 GMT 2010 From /weblog/design

language

Issues of annotation dependence test framework, usually new language feature come out to solve some problem people get excited. However people found that the problem it bring are not less than the problem it solve, it take time to proof the value - http://jroller.com[..]tmotion?entry=annotations_suck_a_lot_and

Compare OO feature of difference language - http://www.derangedcoder.net[..]ral/comparingObjectOrientedFeatures.html

Comparing C# and Java - http://www.25hoursaday.com/CsharpVsJava.html

Discussion about extending standard API - http://www.codinghorror.com/blog/archives/001151.html

Few good suggestion when thinking of design a language, Consider using ML, Don't be afraid of being the same - http://www.plsadventures.com[..]programming-language-design-is-hard.html

Design Principles Behind Smalltalk, see how idea of inheriance, polymorphism originated - http://web.archive.org[..]/design_principles_behind_smalltalk.html

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Tue Feb 02 04:03:55 GMT 2010 From /weblog/design

indexing

twelve things you should know about indexing - http://www.ademero.com[..]elve-things-you-should-know/indexing.php

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Wed Jan 20 17:46:26 GMT 2010 From /weblog/design/IoC

Inversion of Control

When these containers talk about how they are so useful because they implement "Inversion of Control" I end up very puzzled. Inversion of control is a common characteristic of frameworks, so saying that these lightweight containers are special because they use inversion of control is like saying my car is special because it has wheels.

http://www.martinfowler.com[..]ticles/injection.html#InversionOfControl

This guy think IoC is going to use is more and more place as GC. However, I will think quit a lot of time IoC is use incorrectly, somebody even try to use it everywhere and replacing constructor... - http://howardlewisship.com[..]endency-injection-mirror-of-garbage.html

IMHO jetty is the first widely used program about IoC idea, even before spring - http://kasparov.skife.org/blog/2004/08/30/

Explain when IoC is overkill - http://blog.objectmentor.com[..]010/01/17/dependency-injection-inversion

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Thu Jan 14 11:13:15 GMT 2010 From /weblog/design

aspect

Article with example to show how aspect can help in most common case - http://www.infoq.com/articles/aspects-of-domain-model-mgmt

http://veerasundar.com[..]se-cases-of-aspect-oriented-programming/

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Tue Jan 05 17:47:53 GMT 2010 From /weblog/design

version

A Theory of Compatible Versions, and introduction of how and why difference versions are comptible or not - http://www.xml.com/lpt/a/1684

XStream offers some support for refactorings (aliases can help). But very soon you will run into big troubles and will have to make some decisions. Either avoid refactorings (just a little tweak here and there, will weaken your architecture over time) or start implementing workarounds – e.g. custom converters (much work, bad code). - http://blog.cedarsoft.com[..]ts-wrong-with-xstream-and-similar-tools/

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Wed Dec 30 16:46:40 GMT 2009 From /weblog/design/interview

Rod Johnson

Lessons Learned From Java EE’s Evolution, discuss about value of standard and opensource - http://www.infoq.com/presentations/Lessons-Learned-from-Java-EE

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Wed Dec 09 16:01:54 GMT 2009 From /weblog/design/interview

Ralph Johnson

http://www.infoq.com[..]h-Johnson-Parallel-Programming-Patterns#

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Fri Nov 27 07:56:17 GMT 2009 From /weblog/design/distribute

eventual-consistency

A short example to show how eventual-consistency work - http://sbtourist.blogspot.com[..]/11/eventual-consistency-by-example.html

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Thu Nov 12 01:57:25 GMT 2009 From /weblog/design/pattern

repository

http://giorgiosironi.blogspot.com/2009/10/repository-pattern.html

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Fri Sep 25 11:04:28 GMT 2009 From /weblog/design

mutability

http://en.wikipedia.org/wiki/Const
http://www.c2.com/cgi/wiki?ValueObjectsShouldBeImmutable
http://www.markhneedham.com[..]09/16/coding-watch-out-for-mutable-code/
Discuss issue of mutability from another aspect - http://www.artima.com/articles/hickey_on_time.html

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Fri Sep 25 02:27:20 GMT 2009 From /weblog/design

GUI

Idea of using in memory DB as cache - http://www.nabble.com[..]-do-you-think-about-that--tf4938723.html

MVP sample - http://digerati-illuminatus.blogspot.com[..]omposite-ui-application-block-model.html http://googletesting.blogspot.com[..]ith-all-sport-drug-scandals-of-late.html http://blog.dczweb.net[..]el-View-Presenter-%28MVP%29-Pattern.aspx

http://googlewebtoolkit.blogspot.com[..]dget-best-practices-widget-building.html

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Thu Sep 24 04:35:05 GMT 2009 From /weblog/design

failfast

Have read this article long time before: http://www.martinfowler.com/ieeeSoftware/failFast.pdf However, the more I work on programming the more I find that reasonable default (may be with logging) work better in some cases, but really need to beware about the cost of debugging if there is problem....

Another discussion about failfast vs. failsafe - http://www.certpal.com[..]009/09/iterators-fail-fast-vs-fail-safe/

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Fri Sep 18 17:37:37 GMT 2009 From /weblog/design

concept

http://www.butunclebob.com[..].UncleBob.ArchitectureIsaSecondaryEffect

sunday-school truth: if you don't do well in small think, you will do worse at big thing: http://udidahan.weblogs.us/archives/035032.html

Wait for best solution - http://www.threeriversinstitute.org/blog/?p=374

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Sat Sep 12 16:05:27 GMT 2009 From /weblog/design

delete

I think there's perfectly reasonable scenarios for both soft and hard deletes, with and without audit trails.

1. Soft delete:
A user signs off of your service, but you need to keep (anonymized) stats data consistent for your customers - here you cannot remove the entire user, you just blank his personal data (name, email, phone, ...) and keep the anonymized statistical data (country, birth year, profession).

2. Soft (or super-soft) delete with audit trail:
Any financial transaction data, even if entered by error, may only be corrected by adding a correction entry, not by deleting the erroneous entry, or the IRS will be all over you. So either you flag it as deleted (soft delete) or you correct it by adding another entry ("super-soft delete").

3. Hard delete with audit trail:
A user unsubscribes from your newsletter. No need to keep the info "he once was subscribed to it" in the live database, but need to keep the info somewhere accessible in case he sues you for spamming and you can prove "but back in August when you got the mail, you were still subscribed".

4. Hard delete with no audit trail:
Personal data as in #1 if your local data protection laws require. (This means *no* more storing, *anywhere*, technically speaking not even in last month's backup, but that's another issue altogether.)

http://ayende.com/Blog/archive/2009/08/30/avoid-soft-deletes.aspx

And Udi think is real life, people usually never really delete something - http://www.udidahan.com/2009/09/01/dont-delete-just-dont/

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Wed Sep 02 16:28:22 GMT 2009 From /weblog/design

composition over inheritance

Good example of composition over inheritance - http://www.javablogging.com/comparable-vs-comparator/

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Wed Jun 25 01:59:02 GMT 2008 From /weblog/design/exception

problem of using exception for control flow

Other than harder to read, this approach is easier to have side effect, consider the following case:


    // Code which fail
    public String service() { 
        try {
	// a lot of other code....	
            return getRecord();
        } catch (SQLException re) {
            return "defaultRecord";
        }
    }

    private String getRecord() throws SQLException {
        PreparedStatement ps = getConnection().prepareStatement("select something from sometable");
        try {
            final ResultSet rs = ps.executeQuery();
            try {
                if (rs.next())
                    return rs.getString(1);
                else
                    throw new NotFoundException();
            } finally {
                rs.close();
            }
        } finally {
            ps.close();
        }

        // definition of NotFoundException, analog to IOException and FileNotFoundException
        public final class NotFoundException extends SQLException {....}

The idea is, for any database problem, just return default value. However, if someone change the interface of NotFoundException to

public final class NotFoundException extends RuntimeException {....}

Then it break service() silencely :-/ Some to it is better to have


    // Code which fail
    public String service() {
        try {
        // a lot of other code....
            return getRecord() == null ? "defaultRecord" : getRecord();
        } catch (SQLException re) {
	// proper exception handling
        }
    }

    private String getRecord() throws SQLException {
        PreparedStatement ps = getConnection().prepareStatement("select something from sometable");
        try {
            final ResultSet rs = ps.executeQuery();
            try {
                if (rs.next())
                    return rs.getString(1);
                else
                    return null;
            } finally {
                rs.close();
            }
        } finally {
            ps.close();
        }

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Tue May 06 06:25:04 GMT 2008 From /weblog/design/interview

Donald Knuth

Donald Knuth on Multi-Core, Unit Testing, Literate Programming, and XP:

I also must confess to a strong bias against the fashion for reusable code. To me, "re-editable code" is much, much better than an untouchable black box or toolkit. I could go on and on about this. If you’re totally convinced that reusable code is wonderful, I probably won’t be able to sway you anyway, but you’ll never convince me that reusable code isn’t mostly a menace...

http://www.artima.com/forums/flat.jsp?forum=276&thread=229705

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Mon Apr 28 17:46:55 GMT 2008 From /weblog/design/interview

Bjarne Stroustrup

Nice message cover DSL, IDE, multiple dispatch, message passing, and more

http://msdn2.microsoft.com/en-us/magazine/cc500572.aspx

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Mon Mar 17 17:25:25 GMT 2008 From /weblog/design/examples

suggestion of search engine improvement

Nice suggestions, I think this can apply to most search function

Don’t tell me everything you know - limit to specific set of datas , like ameture / professional
Ask me the next most reasonable question
Offer me to establish my search identity

http://jooto.com[..]008/01/05/how-to-improve-search-engines/

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Mon Mar 17 17:25:24 GMT 2008 From /weblog/design/exception

Handle exception at event

To prevent no one notice there is problem

What the code is trying to do is make sure is that any exception thrown is brought to the attention of the user. I’ve been looking at a few approaches to help catch and handle these exceptions without the developer having to explicitly catch them at the UI level.
You can create your own EventQueue, and have it catch uncaught exceptions when dispatching methods

http://www.magpiebrain.com[..]2004/07/21/catching-uncaught-exceptions/

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