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Hexagonal Symfony
MarcelloDuarte
@_md SensioLabs
@_md SensioLabs
Aboutme
MarcelloDuarte
SensioLabs
UK
@_md
work
contribute
tweet
@_md SensioLabs
Whydowecareabout
maintainability?
@_md SensioLabs
ConveniencevsMaintainability
@_md SensioLabs
Maintainabilityisnota
thingforthefuture
@_md SensioLabs
“Wecannotmanagewhatwecannot
measure”
@_md SensioLabs
“Wecannotmanagewhatwecannot
measure”
@_md SensioLabs
Wecannotmanagewhatwecannot
change
@_md SensioLabs
“A framework is‘just’one of the tools to help 

you develop better and faster”
– Symfony documentation
@_md SensioLabs
Faster is not enough
@_md SensioLabs
Growable
http://upload.wikimedia.org/wikipedia/commons/3/39/Domestic_Goose.jpg
@_md SensioLabs
“Key in making great and growable systems is to



design how its modules communicate 



[and not] what their properties and behaviours should be.”
ViewpointsResearchInstituteSource-BonnieMacbirdURL-http://www.vpri.org
@_md SensioLabs
real procedure Sum (k, l, u, ak)
value l, u;
integer k, l, u; real ak;
begin
real S; S := 0;
for k := l step 1 until u do
S := S + ak;
Sum := S;
end;
x := Sum( i, 1, n, V[i] );
@_md SensioLabs
FromBlockStructuretoOO
@_md SensioLabs
Glyph Class Char (c);
Character c;
Begin
Procedure print;
OutChar(c);
End;
@_md SensioLabs
Module A Module B
flowofcontrol?
sourcecodedependency?
@_md SensioLabs
controller
use case
utility
uses
uses
Naïve
Implementation
@_md SensioLabs
!
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'));
}
@_md SensioLabs
!
public
{
$em
$product
!
!
$product
$em
!
}
Doctrine
Redirect
Model
Router
@_md SensioLabs
Module A Polymorphic
Dependency
Inversion
Principle
Module B
[Martin 02]
@_md SensioLabs
use case
service
adapter
utility
adapter
service
utility
@_md SensioLabs
Layered
Architecture
User Interface
Application
Domain
Infrastructure
[Evans 04]
@_md SensioLabs
@_md SensioLabs
“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]
@_md SensioLabs
http://www.flickr.com/photos/10849858@N00/2696404813
world
@_md SensioLabs
http://www.flickr.com/photos/mac_users_guide/3680586328/
@_md SensioLabs
HexagonalArchitecture
your
application
@_md SensioLabs
web gui
app
your
application
usersideports
test
adapter
@_md SensioLabs
web gui
app
your
application
usersideports
test
adapter
datasideports
db
access
in
memory
db
@_md SensioLabs
Db
rest
Logs
@_md SensioLabs
“Architectureisaboutintent”
[Martin 02]
STARTWRITINGAUNITTESTFORTHEENTRYPOINT,
BUTINSTEADOFIMMEDIATELYTRYINGTOSOLVETHEPROBLEM,INTENTIONALLY
DEFERWRITINGANYIMPLEMENTATIONLOGIC!INSTEAD,BREAKDOWNTHE
PROBLEMBYDREAMINGUPALLOFTHEOBJECTSYOUWISHYOUHAD
JustinSearls
KNOWINADVANCEWHEREYOUAREGOINGTOPUTCERTAIN
BEHAVIOURS. […]INSHORT,BEFOREYOUWRITEYOURFIRSTTEST,
YOUHAVETO"DREAMUPTHE[BOUNDARIES]THATYOUWISHYOU
HAD".UncleBeb
@_md SensioLabs
Dreamthefeature
@_md SensioLabs
@_md SensioLabs
Dreamtheboundaries
@_md SensioLabs
L&D app
!
!

Learning Domain
Google
Auth Employees
API
Twitter
bootstrap
@_md SensioLabs
Expressintent
@_md SensioLabs
<—— Domain	
<—— Application	
<—— Delivery Port	
<—— Persistency Port
@_md SensioLabs
Contextalsohaveboundaries
@_md SensioLabs
@_md SensioLabs
Controllersdependonusecases
@_md SensioLabs
/**
* @Route(service="controllers.skills")
*/
class SkillsController
{
private $competencyFinder;
private $raterFinder;
!
public function __construct(CompetencyFinder $competencyFinder)
{
$this->competencyFinder = $competencyFinder;
}
!
/**
* @Route("/skills", name="skills")
* @Template()
* Show the skill for the learners role
*/
public function indexAction()
{
return ['competencies' => $this->competencyFinder->findDictionary()];
}
}
@_md SensioLabs
Usecasesdependonthedomain
servicesandports
@_md SensioLabs
<?php
!
namespace InviqaTeamUpSkills;
!
use InviqaLearningLearner;
use InviqaLearningSkillsCompetencyDictionaryFinder;
!
class CompetencyFinder
{
private $learner;
!
private $finder;
!
public function __construct(Learner $learner, CompetencyDictionaryFinder $finder)
{
$this->learner = $learner;
$this->finder = $finder;
}
!
public function findDictionary()
{
return $this->finder->findByLearnerRole($this->learner->getLearnerRole());
}
}
@_md SensioLabs
<?php
!
namespace InviqaLearningSkills;
!
use InviqaLearningLearnerRole;
!
interface CompetencyDictionaryFinder
{
/**
* Gets the dictionary for a particular role
*
* @param LearnerRole $role
* @return InviqaLearningCompetencyDictionary
*/
public function findByLearnerRole(LearnerRole $role);
}
@_md SensioLabs
LeverageSymfonyEventDispatcher
KeepControllerstuffinthecontroller
@_md SensioLabs
public function onSuccess(Event $event)
{
$this->flashBag->add('success', 'Project has been created.');
}
!
public function onFailure(Event $event)
{
$this->flashBag->add(
'failure', 'Failed to create project.' . PHP_EOL . $event->get(‘reason')
);
}
@_md SensioLabs
Andmakeyoucontrolleralistenerof
yourusecase
@_md SensioLabs
github.com/MarcelloDuarte/hexagonal-symfony
@_md SensioLabs
Thanks!
@_md SensioLabs
Questions?
joind.in/10781
github.com/MarcelloDuarte/hexagonal-symfony

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