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Jacques Chirac peut-il se représenter ? Franchement, il faudrait des circonstances exceptionnelles pour que le chef de l'État se représente. Et je ne peux pas imaginer que Jacques Chirac ne soutien...

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started by longchamppas on 11 Aug 14 no follow-up yet

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Gianluca Brambilla regrette de ne pas avoir pu garder le maillot rose sur le dos alors que le Giro arrive en Vénétie.Gianluca Brambilla (ITA/Etixx), ex-maillot rose : «Je sais que c'est étrange de ...

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started by subsequent1 subsequent1 on 18 May 16 no follow-up yet

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?
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Unfortunately this is a huge violation of the Single Responsibility Principle — or its big brother the Common Closure Principle.
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These principles tell us to group together things that change together, and keep apart things that change for different reasons.
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When you separate things that change for the same reasons, you have to make changes in many different places in the system.
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So it’s a lot of work just to get anything working.
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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.
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So what’s the solution? First of all, I question whether the system needed to be partitioned into services.
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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.
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Many systems could be streamlined, and development made much faster, if the system designers paid more attention to the Single Responsibility Principle.
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Bousculé légèrement par la foule , Harry suivit Mr Weasley par les portes dans la petite salle au-delà , où au moins vingt ascenseurs se tenaient derrière forgé grilles dorées . Harry et Mr Weasley...

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