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Commit 241ea85

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[php][step_shotgun_surgery-01_base] Add Shotgun Surgery example
1 parent d5f2b62 commit 241ea85

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<?php
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declare(strict_types=1);
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namespace CodelyTv\StepShotgunSurgery\Application;
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use CodelyTv\StepShotgunSurgery\Domain\StepDurationCalculatorFactory;
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use CodelyTv\StepShotgunSurgery\Domain\StepRepository;
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class GetStepDuration
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{
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private StepRepository $steps;
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public function __construct(StepRepository $steps)
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{
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$this->steps = $steps;
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}
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public function __invoke(string $stepId): float
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{
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$step = $this->steps->find($stepId);
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return StepDurationCalculatorFactory::build()->calculate($step);
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}
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}
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<?php
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declare(strict_types=1);
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namespace CodelyTv\StepShotgunSurgery\Domain;
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class DurationMultiplier
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{
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public static function multiplierFor(Step $step): float
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{
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if ($step->type() === StepEnums::STEP_TYPE_VIDEO) {
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return StepEnums::STEP_DURATION_MULTIPLIER_VIDEO;
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}
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if ($step->type() === StepEnums::STEP_TYPE_QUIZ) {
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return StepEnums::STEP_DURATION_MULTIPLIER_QUIZ;
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}
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return 1.0;
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}
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}
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<?php
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declare(strict_types=1);
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namespace CodelyTv\StepShotgunSurgery\Domain;
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class Question
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{
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}
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<?php
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declare(strict_types=1);
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namespace CodelyTv\StepShotgunSurgery\Domain;
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final class QuizStep extends Step
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{
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private array $questions;
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public function __construct(string $id, Question ...$questions)
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{
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parent::__construct($id);
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$this->questions = $questions;
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}
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public function type(): string
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{
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return StepEnums::STEP_TYPE_QUIZ;
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}
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public function questionCount(): int
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{
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return count($this->questions);
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}
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}
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<?php
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declare(strict_types=1);
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namespace CodelyTv\StepShotgunSurgery\Domain;
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abstract class Step
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{
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private string $id;
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public function __construct(string $id)
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{
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$this->id = $id;
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}
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public function id(): string
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{
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return $this->id;
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}
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abstract public function type(): string;
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}
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<?php
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declare(strict_types=1);
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namespace CodelyTv\StepShotgunSurgery\Domain;
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interface StepDurationCalculator
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{
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public function supports(Step $step): bool;
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public function calculate(Step $step): float;
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}
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<?php
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declare(strict_types=1);
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namespace CodelyTv\StepShotgunSurgery\Domain;
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use RuntimeException;
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class StepDurationCalculatorChain implements StepDurationCalculator
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{
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/** @var StepDurationCalculator[] */
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private array $calculators;
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public function __construct(StepDurationCalculator ...$calculators)
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{
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$this->calculators = $calculators;
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}
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public function supports(Step $step): bool
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{
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return in_array($step->type(), StepEnums::STEP_TYPES);
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}
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public function calculate(Step $step): float
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{
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if (!$this->supports($step)) {
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throw new RuntimeException("Missing calculator for step type {$step->type()}");
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}
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foreach ($this->calculators as $calculator) {
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if ($calculator->supports($step)) {
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return $calculator->calculate($step);
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}
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}
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throw new RuntimeException("Missing calculator for step type {$step->type()}");
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}
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}
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<?php
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declare(strict_types=1);
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namespace CodelyTv\StepShotgunSurgery\Domain;
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class StepDurationCalculatorFactory
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{
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public static function build(): StepDurationCalculator
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{
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// Remember to add the calculator!!
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return new StepDurationCalculatorChain(
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new StepDurationCalculatorVideo(),
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new StepDurationCalculatorQuiz(),
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);
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}
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}
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<?php
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declare(strict_types=1);
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namespace CodelyTv\StepShotgunSurgery\Domain;
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class StepDurationCalculatorQuiz implements StepDurationCalculator
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{
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public function supports(Step $step): bool
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{
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return $step instanceof QuizStep;
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}
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public function calculate(Step $step): float
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{
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return $step->questionCount() * StepEnums::QUIZ_QUESTION_DURATION * DurationMultiplier::multiplierFor($step);
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}
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}
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<?php
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declare(strict_types=1);
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namespace CodelyTv\StepShotgunSurgery\Domain;
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class StepDurationCalculatorVideo implements StepDurationCalculator
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{
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public function supports(Step $step): bool
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{
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return $step instanceof VideoStep;
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}
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public function calculate(Step $step): float
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{
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return $step->videoDuration() * DurationMultiplier::multiplierFor($step);
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}
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}

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