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<?php |
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/** |
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* This file is part of the daikon-cqrs/cqrs project. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Daikon\EventSourcing\EventStore; |
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use Countable; |
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use Ds\Vector; |
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use Iterator; |
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use IteratorAggregate; |
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final class CommitSequence implements IteratorAggregate, Countable |
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{ |
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/** @var Vector */ |
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private $compositeVector; |
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public static function fromArray(array $commitsArray): CommitSequence |
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{ |
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return new static(array_map(function (array $commitState) { |
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return Commit::fromArray($commitState); |
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}, $commitsArray)); |
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} |
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public static function makeEmpty(): CommitSequence |
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{ |
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return new self; |
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} |
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public function __construct(array $commits = []) |
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{ |
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$this->compositeVector = (function (CommitInterface ...$commits): Vector { |
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return new Vector($commits); |
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})(...$commits); |
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} |
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public function push(CommitInterface $commit): self |
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{ |
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if (!$this->isEmpty()) { |
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$nextRevision = $this->getHead()->getAggregateRevision()->increment(); |
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if (!$nextRevision->equals($commit->getAggregateRevision())) { |
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throw new \Exception(sprintf( |
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"Trying to add unexpected revision %s to event-sequence. Expected revision is $nextRevision", |
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$commit->getAggregateRevision() |
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)); |
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} |
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} |
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$commitSequence = clone $this; |
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$commitSequence->compositeVector->push($commit); |
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return $commitSequence; |
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} |
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public function toNative(): array |
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{ |
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return array_map(function (CommitInterface $commit): array { |
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$nativeRep = $commit->toArray(); |
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$nativeRep["@type"] = get_class($commit); |
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return $nativeRep; |
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}, $this->compositeVector->toArray()); |
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} |
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public function getTail(): ?CommitInterface |
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{ |
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return $this->isEmpty() ? null : $this->compositeVector->first(); |
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} |
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public function getHead(): ?CommitInterface |
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{ |
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return $this->isEmpty() ? null : $this->compositeVector->last(); |
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} |
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public function get(StreamRevision $streamRevision): ?CommitInterface |
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{ |
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if ($this->compositeVector->offsetExists($streamRevision->toNative() - 1)) { |
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$this->compositeVector->get($streamRevision->toNative() - 1); |
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} |
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return null; |
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} |
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public function getSlice(StreamRevision $start, StreamRevision $end): self |
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{ |
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return $this->compositeVector->reduce( |
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function (CommitSequence $commits, CommitInterface $commit) use ($start, $end): CommitSequence { |
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if ($commit->getStreamRevision()->isWithinRange($start, $end)) { |
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$commits = $commits->push($commit); /* @var CommitSequence $commits */ |
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return $commits; |
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} |
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return $commits; |
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}, |
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new static |
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); |
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} |
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public function isEmpty(): bool |
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{ |
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return $this->compositeVector->isEmpty(); |
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} |
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public function revisionOf(CommitInterface $commit): StreamRevision |
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{ |
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return StreamRevision::fromNative($this->compositeVector->find($commit)); |
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} |
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public function getLength(): int |
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{ |
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return $this->count(); |
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} |
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public function count(): int |
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{ |
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return $this->compositeVector->count(); |
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} |
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public function getIterator(): Iterator |
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{ |
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return $this->compositeVector->getIterator(); |
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} |
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private function __clone() |
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{ |
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$this->compositeVector = clone $this->compositeVector; |
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} |
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} |
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daikon-cqrs /
event-sourcing
