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TASK BASED UIS

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STIJN VANNIEUWENHUYSE @STIJNVNH

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THIS TALK IS NOT ABOUT UI DESIGN

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THIS TALK IS ABOUT SOFTWARE DESIGN

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CRUD CREATE READ UPDATE DELETE

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$ git push origin master To https://github.com/stivni/doodis.git ! [rejected] master -> master (non-fast-forward) error: failed to push some refs to 'https://github.com/stivni/doodis.git' To prevent you from losing history, non-fast-forward updates were rejected Merge the remote changes (e.g. 'git pull') before pushing again. See the 'Note about fast-forwards' section of 'git push --help' for details.

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SOFTWARE SHOULD GUIDE ITS USERS THROUGH THE BUSINESS PROCESS

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SOFTWARE SHOULD DELIVER VALUE TO THE BUSINESS

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HOW?

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$customer->moveTo( new Address( $street, $number, $zip, $city, $country ) ); $order->pay(Money::EUR(100)); $order->checkout();

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COMMAND PATTERN

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File a bug Acknowledge a bug Decline a bug Describe a bug Categorize a bug Close a bug

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FileBug AcknowledgeBug DeclineBug DescribeBug CategorizeBug CloseBug

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class FileBug implements Command { private $id; private $description; public function __construct($id, $description) { //… } public function getId() { return $this->id; } public function getDescription() { return $this->description; } }

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class FileBugCommandHandler implements CommandHandler { private $bugRepository; public function __construct(BugRepository $bugRepository) { //… } public function handle(FileBug $command) { $this->bugRepository->add( new Bug( $command->getId(), $command->getDescription() ; } }

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class SimpleCommandDispatcher implements CommandDispatcher { /** @var CommandHandler[] */ private $commandHandlers; public function dispatch(Command $command) { $commandType = $this->getTypeFromCommand($command); $this->commandHandlers[$commandType]->handle($command); } public function registerHandler(CommandHandler $commandHandler) { $commandType = $this->getTypeFromCommandHandler($command); $this->commandHandlers[$commandClass] = $commandHandler; } //private function getTypeFromCommand(Command $command) //private function getTypeFromCommandHandler(CommandHandler $command) }

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{ “commandName”: “\\NameSpaced\\FileBug”, “payload”: { “id”: “1”, “description”: “The software doesn’t work” } }

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class SimpleJsonCommandDeserializer implements CommandDeserializer { public function deserialize($data) { $reflectionClass = new ReflectionClass($data->commandName); return $reflectionClass->newInstanceArgs($data->payload); } }

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class CommandDispatcherController { // /api/command/dispatch public function deserialize($serializedCommand) { $command = $this->commandDeserializer->deserialize( $serializedCommand ); $commandDispatcher->dispatch($command); return new Response(“OK”, 200); } }

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DOODIS SOON ON MY GITHUB

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BUT HOW DOES THIS AFFECT THE UI?

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SEPARATE READ MODELS

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[ { “bugId”: “1”, “description”: “Checkout fails with order >= 100 EUR” “affectedFeature”: “CheckoutOrder”, “usageOfFeature”: “2233” }, … ]

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class BugStatistic implements JsonSerializable { private $bugId; private $description; private $affectedFeature; private $usageOfFeature; //public function __constructor(…) //public function jsonSerialize() }

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class BugStatisticsController { /** @var BugStatisticsRepository */ private $bugStatisticsRepository; // /api/bugs/statistics/overview public function overview() { $statistics = $this->bugStatisticsRepository->findAll(); return new Response(json_encode($statistics)); } }

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class QueryingBugStatisticsRepository implements BugStatisticsRepository { public function findAll() { $sql = ‘SELECT * FROM bugs JOIN usage ON bug.feature = usage.feature’; return array_map( function($record) { return new BugStatistic( $record->id, $record->description, $record->feature, $record->usage ); }, $this->fetchAll($sql) ); } }

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CQRS COMMAND QUERY RESPONSIBILITY SEGREGATION PRINCIPLE

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MY APPLICATION IS JUST CRUD

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PROCESSES ARE HARDCODED I WANT MORE FLEXIBILITY

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BUILDING GOOD SOFTWARE IS ABOUT MAKING THE RIGHT TRADEOFFS

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QUESTIONS?

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THANK YOU I’M STIJN VANNIEUWENHUYSE @STIJNVNH PLEASE LEAVE FEEDBACK JOIND.IN/13112