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<?php namespace C4tech\RayEmitter\Domain; |
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use C4tech\RayEmitter\Contracts\Domain\Command as CommandInterface; |
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use C4tech\RayEmitter\Contracts\Domain\Repository as RepositoryInterface; |
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use C4tech\RayEmitter\Facades\EventStore; |
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use C4tech\RayEmitter\Exceptions\OutdatedSequence; |
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use C4tech\RayEmitter\Exceptions\SequenceMismatch; |
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abstract class Repository implements RepositoryInterface |
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{ |
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/** |
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* @inheritDoc |
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*/ |
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public static function get($identifier) |
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{ |
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$aggregate = static::find($identifier); |
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return $aggregate->getEntity(); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public static function handle(CommandInterface $command) |
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{ |
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$aggregate = static::find($command->getAggregateId()); |
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// Optimistic concurrency handling |
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$expected = $command->getExpectedSequence(); |
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$current = $aggregate->getSequence(); |
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if ($expected < $current) { |
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throw new OutdatedSequence( |
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sprintf( |
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'The Aggregate %s has newer data than expected (%s v %s).', |
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get_class($aggregate), |
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$expected, |
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$current |
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), |
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409 |
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); |
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} elseif ($expected > $current) { |
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throw new SequenceMismatch( |
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sprintf( |
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'The Aggregate %s is expected to have more data than it does (%s v %s).', |
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get_class($aggregate), |
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$expected, |
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$current |
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), |
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422 |
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); |
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} |
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$identifier = null; |
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// Queue event for storage |
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if ($event = $aggregate->handle($command)) { |
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$aggregate->apply($event); |
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EventStore::saveEvent($event); |
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$identifier = $event->getId(); |
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} |
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return $identifier; |
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} |
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/** |
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* Create |
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* |
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* Generate a new Aggregate with no history. |
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* @return Aggregate |
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*/ |
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protected static function create() |
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{ |
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throw new Exception('The ' . static::class . '::create method must be defined'); |
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} |
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/** |
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* Find |
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* |
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* Restore an existing Aggregate from the recorded events related to it. |
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* @param void|string $identifier Aggregate root entity identifier. |
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* @return Aggregate |
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*/ |
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protected static function &find($identifier = null) |
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{ |
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$aggregate = static::create(); |
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if ($identifier) { |
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$events = EventStore::getFor($identifier); |
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$aggregate->hydrate($events); |
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} |
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return $aggregate; |
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} |
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} |
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In PHP, under loose comparison (like
==
, or!=
, orswitch
conditions), values of different types might be equal.For
string
values, the empty string''
is a special case, in particular the following results might be unexpected: