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Tarik Guney

Singleton pattern - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Singleton_pattern

singleton-pattern programming

shared by Tarik Guney on 03 Nov 09 - Cached
  • the singleton pattern is a design pattern that is used to restrict instantiation of a class to one object.
  • Tarik Guney on 03 Nov 09
     
    In software engineering, the singleton pattern is a design pattern that is used to restrict instantiation of a class to one object. This is useful when exactly one object is needed to coordinate actions across the system. The concept is sometimes generalized to systems that operate more efficiently when only one object exists, or that restrict the instantiation to a certain number of objects (say, five). Some consider it an anti-pattern, judging that it is overused, introduces unnecessary limitations in situations where a sole instance of a class is not actually required, and introduces global state into an application.
Fabien Cadet

Service Oriented Agony | 8th Light, 2012-02-01 by Bob Martin - 7 views

blog.8thlight.com/...Service-Oriented-Agony.html

software architecture SOA pitfalls

shared by Fabien Cadet on 23 Feb 12 - No Cached
  • The structure seems obvious to system designers who have grown tired of single monolithic systems and want to break those systems up into components and services. What could be more natural than to break the system along the lines of data base managment?
  • Unfortunately this is a huge violation of the Single Responsibility Principle — or its big brother the Common Closure Principle.
  • These principles tell us to group together things that change together, and keep apart things that change for different reasons.
  • ...6 more annotations...
  • When you separate things that change for the same reasons, you have to make changes in many different places in the system.
  • So it’s a lot of work just to get anything working.
  • Moreover, when you group together things that change for different reasons, you expose the components of the system to collateral damage, thrashing, CM collisions, and a whole host of other problems.
  • So what’s the solution? First of all, I question whether the system needed to be partitioned into services.
  • Services are expensive and complicated, you should only create them if you absolutely need to. It’s always easier to live in a single process. Remember Martin Fowler’s first law of distributed objects: Don’t distribute your objects.
  • Many systems could be streamlined, and development made much faster, if the system designers paid more attention to the Single Responsibility Principle.
Joel Bennett

Doing Objects in VB.NET and C# - TerrySmith.net - 0 views

terrysmith.net/...index.html

.netframework book develop howto languages

shared by Joel Bennett on 08 Feb 07 - Cached
  • Joel Bennett on 08 Feb 07
     
    A basic eBook on object-oriented programming in VB.NET and C#. Covers construction and destruction, events, delegates, interfaces and inheritance, and exceptions.
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David Corking

Coherence is an experimental programming language - Jonathan Edwards, MIT - 0 views

coherence-lang.org

OOP Object oriented software Squeak Lisp

shared by David Corking on 27 Apr 09 - Cached
  • David Corking on 27 Apr 09
     
    Is this 'coherence' or subtextual programming a close cousin of Kenny Tilton's Cells?
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