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<?php declare(strict_types=1); |
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namespace Stratadox\CommandHandling; |
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use function array_key_exists; |
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use function class_exists; |
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use function get_class; |
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use function is_string; |
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/** |
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* The command bus is a handler that can take different types of commands, |
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* delegating them to their designated command handlers. |
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*/ |
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final class CommandBus implements Handler |
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{ |
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/** @var Handler[] */ |
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private $registry; |
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/** @throws InvalidBusConfiguration */ |
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private function __construct(array $registry) |
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{ |
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foreach ($registry as $commandClass => $handler) { |
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$this->mustBeAnExisting($commandClass); |
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$this->mustBeACompatible($handler); |
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} |
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$this->registry = $registry; |
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} |
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/** @throws InvalidBusConfiguration */ |
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public static function handling(array $commands): Handler |
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{ |
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return new self($commands); |
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} |
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/** @inheritdoc */ |
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public function handle(object $command): void |
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{ |
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$this->mustBeAKnown($command); |
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$this->registry[get_class($command)]->handle($command); |
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} |
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/** @throws InvalidBusConfiguration */ |
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private function mustBeAnExisting($commandClass): void |
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{ |
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if (!is_string($commandClass) || !class_exists($commandClass)) { |
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throw CommandClassNotFound::tryingToConfigure($commandClass); |
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} |
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} |
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/** @throws InvalidBusConfiguration */ |
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private function mustBeACompatible($commandHandler): void |
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{ |
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if (!$commandHandler instanceof Handler) { |
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throw InvalidCommandHandler::triedToAssign($commandHandler); |
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} |
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} |
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/** @throws CommandNotRecognised */ |
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private function mustBeAKnown($command): void |
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{ |
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if (!array_key_exists(get_class($command), $this->registry)) { |
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throw CommandNotRecognised::triedToHandle($command); |
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} |
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} |
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} |
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Stratadox /
CommandHandling
