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Hexagonal Architecture
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Chris Fidao
May 16, 2014
Technology
49
200k
Hexagonal Architecture
An explanation on what Hexagonal Architecture is - the decoupling of layers in your code.
Chris Fidao
May 16, 2014
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Transcript
Hexagonal Architecture Chris Fidao (hek-sag-uh-nl)
@fideloper
None
Implementing Laravel Real-world implementation of testable and maintainable code. (hopefully)
Vaprobash Vagrant Provisioning Bash Scripts
Servers for Hackers.com
Why / What Ports / Adapters Boundary Layers /
WHY Architecture
Maintainability Technical Debt Time
What is it?
So…What is it?
The Hexagon Core Domain Application Domain Framework
(Core) Domain Core Domain Application Domain Framework
Behavior
Constraints
Application Core Domain Application Domain Framework
Framework Core Domain Application Domain Framework
Outside Core Domain Application Domain Framework
Ports Adapters /
Ports & Adapters Core Domain Application Domain Framework
Inside/Outside Core Domain Application Domain CommandBus Framework HTTP Use Case
Repo DBAL Database Events Dispatcher Service Impl
Core Domain Application Domain Framework Dependencies
interface Notifier { ! public function send(Message $message); } class
SesNotifier implements Notifier { ! public function send(Message $message) { // Details } }
Use-Case Driven Development
All the Contexts •Web •API •CLI •Queue •Event Handler
Use Cases: CommandBus CommandBus executes( ) Command Handler handles( )
Command
// Class SimpleCommandBus ! public function execute( $command ) {
return $this->getHandler( $command ) ->handle( $command ); } Simple CommandBus
Core Domain Application Domain CommandBus Framework HTTP Use Case Repo
DBAL Database Events Dispatcher Service Impl
None
Boundaries
Domain/Application Boundary Core Domain Application Domain Framework Use Case Repo
Events
interface CommandBusInterface { ! public function execute( $command ); }
interface HandlerInterface { ! public function handle( $command ); }
Core Domain Application Domain Framework Use Case Repo Events
interface TicketRepositoryInterface { ! public function getStaffOpenTickets( Staffer $staffer, $limit=10);
! ! public function save(Ticket $model); }
Application Domain CommandBus Framework DBAL Dispatcher The Application/External Boundary
interface Notifier { ! public function send(Message $message); } interface
Validator { ! public function passes(Array $data); ! public function getErrors(); } interface Dispatcher { ! public function dispatch(Array $events); }
Framework Core Domain Application Domain Framework HTTP Database Service Impl
Identify the aspects that vary and separate them from what
stays the same
Layers
The Domain Core Domain Application Domain Framework Use Case Repo
Events
<?php namespace Hex\Tickets; ! class Ticket extends Model { !
public function assignStaffer(Staffer $staffer) { if( ! $staffer->categories->contains( $this->category ) ) { throw new DomainException("Staffer can't be assigned to ".$this->category); } ! $this->staffer()->associate($staffer); // Set Relationship ! return $this; } ! public function setCategory(Category $category) { if( $this->staffer instanceof Staffer && ! $this->staffer->categories->contains( $category ) ) { // Unset staffer if can't be assigned to set category $this->staffer = null; } ! $this->category()->associate($category); // Set Relationship ! return $this; } }
class Ticket extends Model { ! /* ... Other logic
... */ ! public function save(array $options = array()) { /* Integrity Checks, and then: */ ! if( ! $this->exists ) { $this->raise( new TicketCreatedEvent($this) ); } ! return parent::save($options); } }
class CreateTicketCommand { ! protected $data; ! public function __construct($data)
{ $this->data = $data; } ! public function __get($property) { // Simplified example return $this->data[$property]; } }
The Application Application Domain CommandBus Framework DBAL Dispatcher
// Class SimpleCommandBus ! public function execute( $command ) {
return $this->getHandler( $command ) ->handle( $command ); }
! class CreateTicketHandler implements HandlerInterface { ! ! public function
handle($command) { $this->validate($command); // Throw ValidationException $this->save($command); } ! protected function save($command) { $ticket = new Ticket; /* Some other setters... */ $ticket->setCategory( $this->catRepo->find($command->category_id) ); $ticket->setStaffer( $this->staffRepo->find($command->staffer_id) ); $ticket->addMessage( $ticket->addMessage($command->message); ); ! $this->ticketRepo->save($ticket); // Use Repositories ! $this->dispatcher->dispatch( $ticket->flushEvents() ); // Fire Events } }
class DbTicketRepository implements RepositoryInterface { ! public function getStaffOpenTickets(Staffer $staffer,
$limit=10) { return $this->ticket->where('staff_id', $staffer->id) ->take($limit)->get(); } ! public function save(Ticket $ticket) { $ticket->save(); } }
Framework Core Domain Application Domain Framework HTTP Database Service Impl
class TicketController extends BaseController { ! public function createTicket() {
$command = new CreateTicketCommand( Input::all() ); ! try { $this->bus->execute($command); } catch(ValidationException $e) { return Redirect::to('/tickets/new') ->withErrors( $e->getErrors() ); } catch(DomainException $e) { return Redirect::to('/tickets/new') ->withErrors( $e->getErrors() ); } return Redirect::to(‘/tickets'); } }
class SesEmailNotifier implements NotifierInterface { ! public function __construct(SesClient $client)
{ $this->client = $client; } ! public function send(Message $message) { $to = [$message->to()]; $message = ['Data' => $message->message()]; ! $this->client->sendEmail([ 'Destination' => ['ToAddresses' => $to], 'Message' => ['Body' => ['Html' => $message]] ]); } }
use Illuminate\Events\Dispatcher as EventDispatcher; ! class LaravelDispatcher implements Dispatcher {
! public function __construct(EventDispatcher $dispatcher) { $this->dispatcher = $dispatcher; } ! public function dispatch(Array $events) { foreach( $events as $event ) { $this->dispatcher->fire( $event->name(), $event ); } } ! }
TDD is DEAD (and other myths)
Identify the aspects that vary and separate them from what
stays the same
Thanks