The Framework as an Implementation DetailMarcello Duarte / Konstantin Kudryashov
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About us
@_mdMarcello Duarte HEAD OF TRAINING, INVIQA
@everzetKonstantin Kudryashov BDD PRACTICE MANAGER, INVIQA
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This talk
[ Convenience ][ Choices ][ Future ]
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Choice
Convenience
http://www.flickr.com/photos/johnwinkelman/6200402992/
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We dolove .
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Promise
“A framework is ‘just’ one of the tools to help you develop better and faster”
– Symfony documentation
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“The only way to go fast is to go well” – Uncle Bob
FAST SLOW
QUALITY SWITCH
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Relative cost of repair
analysis design code test support
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Convenientvs
Maintainable
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A framework is “convenient” when it makes choices for you
BookController e
xtends Controlle
r
AuthorsController extends ContainerAwareController
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The code is maintainable when the framework lets you make
the choices
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Instability and abstractnessinstability
abstractness
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The “convenient” code is usually not very testable
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Symfony can be convenient
public function updateAction($id){ $em = $this->getDoctrine()->getManager(); $product = $em->getRepository('AcmeStoreBundle:Product')->find($id);
if (!$product) { throw $this->createNotFoundException( 'No product found for id '.$id ); }
$product->setName('New product name!'); $em->flush();
return $this->redirect($this->generateUrl('homepage'));}
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The “convenient” Controllertends to ask for more
Integration Tests
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Integration Testsstinks of coupling
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Feedback
Outer QualityInner Quality
Acceptance TestsUnit Tests
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Choice
Choices
http://www.flickr.com/photos/tmartin/32010732/
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Should we always TDD? what the Start Up said what the Craftsmen said
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We doTest Driven Design
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Design is about choices
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Design is a professional activity
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TDD is about communication
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TDD is about your stakeholders
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The developers in the team are also stakeholders
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TDD is for long term relationships
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How many dependencies can you spot?
public function updateAction($id){ $em = $this->getDoctrine()->getManager(); $product = $em->getRepository('AcmeStoreBundle:Product')->find($id);
if (!$product) { throw $this->createNotFoundException( 'No product found for id '.$id ); }
$product->setName('New product name!'); $em->flush();
return $this->redirect($this->generateUrl('homepage'));}
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How many dependencies can you spot?
public function updateAction($id){ $em = $this->getDoctrine()->getManager(); $product = $em->getRepository('AcmeStoreBundle:Product')->find($id);
if (!$product) { throw $this->createNotFoundException( 'No product found for id '.$id ); }
$product->setName('New product name!'); $em->flush();
return $this->redirect($this->generateUrl('homepage'));}
DoctrineRedirectRouterModel
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Hexagonal Architecture
“The hexagon is not a hexagon because the number six is important, but rather to allow the people doing the drawing
to have room to insert ports and adapters as they need”
:)
[Cockburn 08]
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http://www.flickr.com/photos/10849858@N00/2696404813
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http://www.flickr.com/photos/mac_users_guide/3680586328/
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your application
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web gui app
your application
user side ports
test adapter
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web gui app
your application
user side ports
test adapter
data side ports
db access service
in memory
db
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Hexagonal Architecture
Dbrest
Logs
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Dependency Inversion
Higher level modules should not depend on lower level details
[Martin 02]
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Naive implementation
controller
use case
utility
uses
uses
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Dependency Inversion
use case
serviceadapter
utilityadapter
service
utility
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Choice
Let’s see some code
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Choice
Future
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Choice
Thanks!joind.in/9331
github.com/MarcelloDuarte/hexagonal-symfony
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