May 2005

 

Today's Dynamic is Tomorrow's Static

Today at the IEEE Software's editorial and advisory board meeting, the issue of service-oriented architectures came up. Robert Glass wondered whether this was the upcoming fad, following structured programming and object-oriented programming, to which Stan Rifkin replied that service-oriented architectures are a lot more dynamic. Interestingly, the previous approaches, which we today consider as static, were also thought-off as dynamic in their day.

Continue reading "Today's Dynamic is Tomorrow's Static"

Cats and Cigarette Lighters

On April 14th, the US Transportation Security Administration started enforcing a new ban on cigarette lighters. A month later, I saw the corresponding announcement posted on a check-in desk at the Samos international airport. At the same airport I also saw a free-roaming cat getting its food delivered directly on the tarmac. I entered my flight feeling a lot safer.

Continue reading "Cats and Cigarette Lighters"

Warum einfach, wenns auch kompliziert geht?

(Why make it simple, when you can also make it complicated?) Consider the task of associating code with specific data values. Using a multi-way conditional can be error-prone, because the data values become separated by the code. It can also be inefficient in the cases where we have to use cascading else if statements, instead of a switch, which the compiler can optimize into a hash table. In C I would use an array containing values and function pointers. My understanding is that the Java approach involves using the Strategy pattern: a separate class for each case, and an interface "to rule them all".

Continue reading "Warum einfach, wenns auch kompliziert geht?"

Ordnung muss sein

A free-form translation of the above German phrase (orderliness must exist) would be that orderliness is not negotiable. In the domain of information technology I find this motto particularly pertinent.

Continue reading "Ordnung muss sein"

Google's Web Accelerator as a P2P CDN

I admire Google's guts in deploying their Web Accelerator. Proposing to act as an intermediary for the whole planet's web traffic takes a lot of courage and a certain amount of audacity. Interestingly, the system's design can be quite scalable, through the use of peer-to-peer and personalization technology.

Continue reading "Google's Web Accelerator as a P2P CDN"

Java Makes Scripting Languages Irrelevant?

Simplicity does not precede complexity, but follows it.

— Alan J. Perlis

In computing we often solve a complex problem by adding another level of indirection. As an example, on Unix file systems an index node, or inode, data structure allows files to be allocated concurrently and sparsely, and yet still provide an efficient random access capability. When we want to customize large and complex systems or express fluid and rapidly changing requirements a common tool we employ is to add a scripting layer on top of the corresponding system. An early instance of this approach was employed in Dan Murphy's TECO editor developed on the DEC PDP-1 computer in 1962–63: its command language also doubled as an arcane (to put it politely) macro language.

Continue reading "Java Makes Scripting Languages Irrelevant?"

Become a Unix command line wizard
edX MOOC on Unix Tools: Data, Software, and Production Engineering
Debug like a master
Book cover of Effective Debugging
Compute with style
Book cover of The Elements of Computing Style
Syndication
This blog is also available as an RSS feed: XML RSS feed

Category Tags
AWS (4)
Android (2)
Apple (9)
C (20)
C++ (16)
Cloud (1)
Computers (58)
Databases (4)
Debugging (7)
Design (1)
Discussion (6)
Electronics (14)
Environment (1)
FreeBSD (25)
Funny (14)
GSIS (5)
Google (6)
Government (2)
Hacks (25)
Hardware (23)
History (7)
Internet (12)
Java (26)
Linux (6)
Management (26)
Microsoft (11)
One Laptop Per Child (3)
Open source (57)
Opinion (28)
Parenting (11)
Perl (13)
Photos (13)
Politics (4)
Programming (108)
R (1)
Raspberry Pi (3)
Risks (6)
Scala (1)
Science (33)
Security (26)
Sights (19)
Smartphones (3)
Software (21)
Software engineering (88)
Standards (6)
System administration (46)
Teaching (8)
Technology (27)
Testing (1)
Tips (41)
Tools of the Trade (52)
Travel (9)
UML (6)
Unix (44)
Web (31)
Windows (14)
Writing (45)
XML (10)
vim (5)
Archive
Complete contents (355)
February 2020 (1)
December 2019 (2)
November 2019 (1)
May 2019 (1)
November 2018 (2)
August 2018 (1)
April 2018 (1)
February 2018 (1)
November 2017 (2)
October 2017 (1)
September 2017 (3)
August 2017 (2)
June 2017 (2)
May 2017 (2)
April 2017 (1)
March 2017 (1)
February 2017 (2)
January 2017 (4)
December 2016 (1)
November 2016 (1)
October 2016 (2)
September 2016 (1)
May 2016 (1)
March 2016 (1)
December 2015 (1)
November 2015 (1)
June 2015 (1)
May 2015 (1)
February 2015 (1)
January 2015 (1)
September 2014 (1)
August 2014 (1)
July 2014 (1)
April 2014 (1)
January 2014 (1)
December 2013 (2)
October 2013 (1)
September 2013 (1)
July 2013 (2)
June 2013 (2)
May 2013 (1)
March 2013 (2)
February 2013 (1)
January 2013 (1)
December 2012 (3)
October 2012 (2)
September 2012 (3)
August 2012 (1)
July 2012 (1)
June 2012 (1)
May 2012 (1)
March 2012 (2)
February 2012 (1)
January 2012 (2)
December 2011 (3)
November 2011 (1)
October 2011 (1)
September 2011 (1)
July 2011 (3)
May 2011 (3)
February 2011 (1)
January 2011 (1)
November 2010 (1)
October 2010 (2)
August 2010 (3)
July 2010 (1)
June 2010 (1)
May 2010 (1)
April 2010 (1)
March 2010 (2)
January 2010 (1)
December 2009 (1)
November 2009 (1)
October 2009 (2)
September 2009 (2)
August 2009 (5)
July 2009 (3)
June 2009 (3)
May 2009 (4)
April 2009 (6)
March 2009 (4)
February 2009 (5)
January 2009 (4)
December 2008 (3)
November 2008 (2)
October 2008 (5)
September 2008 (4)
August 2008 (4)
July 2008 (3)
June 2008 (2)
May 2008 (5)
April 2008 (3)
March 2008 (2)
February 2008 (2)
January 2008 (5)
December 2007 (3)
November 2007 (3)
October 2007 (3)
September 2007 (4)
August 2007 (2)
July 2007 (2)
June 2007 (4)
May 2007 (3)
April 2007 (5)
March 2007 (5)
February 2007 (3)
January 2007 (4)
December 2006 (5)
November 2006 (5)
October 2006 (5)
September 2006 (7)
August 2006 (1)
July 2006 (5)
June 2006 (3)
May 2006 (3)
April 2006 (4)
March 2006 (2)
February 2006 (3)
January 2006 (5)
December 2005 (3)
November 2005 (4)
October 2005 (3)
September 2005 (6)
August 2005 (1)
July 2005 (4)
June 2005 (2)
May 2005 (6)
April 2005 (3)
March 2005 (4)
February 2005 (6)
January 2005 (2)
December 2004 (3)
November 2004 (3)
October 2004 (5)
September 2004 (3)
August 2004 (5)
July 2004 (1)
June 2004 (1)
May 2004 (1)
April 2004 (2)
March 2004 (1)
February 2004 (2)
January 2004 (3)
October 2003 (2)
September 2003 (1)
July 2003 (1)
June 2003 (2)
May 2003 (1)

Last update: Wednesday, February 26, 2020 11:41 am

Creative Commons Licence

Unless otherwise expressly stated, all original material on this page created by Diomidis Spinellis is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.