[P2P-F] [P2P-URBANISM WA] relation between patterns in different fields?

Tue May 10 12:00:53 CEST 2011

thanks Michael, very useful,

Michel

On Tue, May 10, 2011 at 3:49 PM, Michael Mehaffy
<michael.mehaffy at gmail.com>wrote:

> Michel,
>
> Yes, "design patterns" is Alexander's pattern language applied to software.
>  (This writer mistakenly applies it more generically to patterns as in
> pattern books, which was only one aspect of Alexander's (and the software
> engineers') thinking - and not the most crucial aspect, which was the
> network logic.
>
> Interestingly, the book author applies design patterns post facto to the
> development of computer networks - looks very interesting.
>
> By the way, Google "design patterns" and you get 3 million hits.  Google
> "pattern language" and you get 400,000 hits - about an 8 to 1 ratio.  The
> architects did something wrong...  (Hint: open source!)
>
> Here is the correct history, listed accurately in the Wikipedia entry for
> Design Patterns:
>
> History
>
> Patterns originated as an architectural concept<http://en.wikipedia.org/wiki/Pattern_%28architecture%29>
>  by Christopher Alexander<http://en.wikipedia.org/wiki/Christopher_Alexander> (1977/79).
> In 1987, Kent Beck <http://en.wikipedia.org/wiki/Kent_Beck> and Ward
> Cunningham <http://en.wikipedia.org/wiki/Ward_Cunningham> began
> experimenting with the idea of applying patterns to programming<http://en.wikipedia.org/wiki/Programming> and
> presented their results at the OOPSLA<http://en.wikipedia.org/wiki/OOPSLA> conference
> that year.[2]<http://en.wikipedia.org/wiki/Design_pattern_%28computer_science%29#cite_note-Smith1987-1>
> [3]<http://en.wikipedia.org/wiki/Design_pattern_%28computer_science%29#cite_note-Beck1987-2> In
> the following years, Beck, Cunningham and others followed up on this work.
>
> p.s. One of the spinoffs was a little device Ward developed to work on the
> patterns collaboratively over the Internet - a little thing called Wiki.
>  You've heard of it?!
>
> Cheers, m
>
>
> On Tue, May 10, 2011 at 8:23 AM, Michel Bauwens <michelsub2004 at gmail.com>wrote:
>
>> any relation with Alexander's work?
>>
>> see:
>>
>> Patterns in Network Architecture From P2P Foundation
>> Jump to: navigation<http://p2pfoundation.net/Patterns_in_Network_Architecture#mw-head>,
>> search<http://p2pfoundation.net/Patterns_in_Network_Architecture#p-search>
>>
>> ** Book: Patterns in Network Architecture: A Return to Fundamentals, by
>> John Day, ISBN-10: 0132252422, ISBN-13: 9780132252423, Prentice Hall, 2007.
>> *
>>
>> URL = http://www.informit.com/store/product.aspx?isbn=0132252422
>>
>>
>>  [edit<http://p2pfoundation.net/Patterns_in_Network_Architecture?title=Patterns_in_Network_Architecture&action=edit&section=1>
>> ] Review
>>
>> Jon Crowcroft:
>>
>> "It isn't every day (pun intended) that one of the true Old Guard writes
>> and publishes a book, and it behooves us to take notice. In this case, the
>> author's expertise and his subject matter are of particular timeliness,
>> because of the worldwide resurgence of activities with regard to
>> next-generation network architectures, that is, a replacement, or upgrade to
>> the Internet (dare one say "Internet 2.0"?).
>>
>> John Day is a well-known scholar of historical cartography, and this book,
>> in a way, is a roadmap of network architecture. The roadmap starts back in
>> 1970, tracing from the roots of connectionless packet-switched dynamically
>> routed systems such as Cyclades, and the ARPANET, through to recent
>> discussions on multihoming, multicast, and mobility, with a view along the
>> way of naming, addressing, protocol stack design, protocol design, and
>> concepts of layering.
>>
>> That description makes the book sound fairly standard in terms of
>> structure and content, but it isn't. The book includes many discursive
>> elements whose intent is to provide a collection of patterns. Design
>> patterns originated in the building trade as a way for crafts people to pass
>> on successful methods of construction (in the sense of affordable and
>> noncollapsing) to less-inventive people (or people who want to spend their
>> inventive efforts in different areas). Software engineers picked up on this
>> idea, applying the techniques in both the microscopic world: patterns allow
>> you to decide what algorithm is applicable in solving a problem in the
>> small; and the macroscopic world: architectural patterns allow you to decide
>> on an approach to breaking down a large system into the right kind of
>> components.
>>
>> Essentially, this book does the same thing, at the protocol stack level,
>> and at the system level, with a collection of historical and contemporary
>> examples to support the arguments.
>>
>> The book makes interesting reading, especially as it represents a fair
>> balance in reporting the early ideas that came not just from the United
>> States, and restates the importance of the Opens Systems Interconnection
>> (OSI) model (not the ISO protocols) in understanding layering and
>> beads-on-a-string, as well as reasserting the use of the model in clarifying
>> the perennially confusing concepts of names, addresses, and routes.
>>
>> The book begins with a discussion of seven principles that emerged through
>> the early history of networking (I won't spoil the book for readers by
>> listing them here), and ends in the tenth and final chapter, entitled
>> "Backing Out of a Blind Alley," with an appeal to fundamentals. Essentially,
>> the author points out that researchers (especially academics) are strongly
>> motivated to keep moving on with claims of ever-newer tricks, but rarely to
>> consolidate these tricks into a set of principles that stand for a long time
>> (because then they would have to completely change the topic of their
>> research). Thus uncovering a foundational theory of networking would put a
>> whole generation of networkers out of work (or funding at least).
>>
>> The book is peppered (saltily) with fine quotes and fascinating asides
>> from philosophy (for this reader, especially, the Chinese diversions were
>> most novel and illuminating). Illustrative of the range is that one finds
>> Wittgenstein and Dave Clark, Confucius, and Dr. Seuss—Frege's useful
>> reminder that "The sign '=' should be read as 'is easily confused with'"
>> would make an excellent IETF T-shirt.
>> I found the book extremely readable and enjoyable, and although I might
>> argue with some of the opinions in the book, I think that this is just more
>> evidence that I should recommend the book to anyone interested in knowing
>> why we are where we are in networking, and being better informed about where
>> we should go next."
>>
>> --
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>>
>>
>>
>>
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>
>
>
> --
> Michael Mehaffy
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