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<?php declare(strict_types=1); namespace Doctrine\ORM\Id; use Doctrine\DBAL\Connections\PrimaryReadReplicaConnection; use Doctrine\ORM\EntityManagerInterface; use Serializable; use function serialize; use function unserialize; /** * Represents an ID generator that uses a database sequence. */ class SequenceGenerator extends AbstractIdGenerator implements Serializable { /** * The allocation size of the sequence. * * @var int */ private $allocationSize; /** * The name of the sequence. * * @var string */ private $sequenceName; /** @var int */ private $nextValue = 0; /** @var int|null */ private $maxValue = null; /** * Initializes a new sequence generator. * * @param string $sequenceName The name of the sequence. * @param int $allocationSize The allocation size of the sequence. */ public function __construct($sequenceName, $allocationSize) { $this->sequenceName = $sequenceName; $this->allocationSize = $allocationSize; } /** * {@inheritDoc} */ public function generateId(EntityManagerInterface $em, $entity) { if ($this->maxValue === null || $this->nextValue === $this->maxValue) { // Allocate new values $connection = $em->getConnection(); $sql = $connection->getDatabasePlatform()->getSequenceNextValSQL($this->sequenceName); if ($connection instanceof PrimaryReadReplicaConnection) { $connection->ensureConnectedToPrimary(); } $this->nextValue = (int) $connection->fetchOne($sql); $this->maxValue = $this->nextValue + $this->allocationSize; } return $this->nextValue++; } /** * Gets the maximum value of the currently allocated bag of values. * * @return int|null */ public function getCurrentMaxValue() { return $this->maxValue; } /** * Gets the next value that will be returned by generate(). * * @return int */ public function getNextValue() { return $this->nextValue; } /** * @return string * * @final */ public function serialize() { return serialize($this->__serialize()); } /** @return array<string, mixed> */ public function __serialize(): array { return [ 'allocationSize' => $this->allocationSize, 'sequenceName' => $this->sequenceName, ]; } /** * @param string $serialized * * @return void * * @final */ public function unserialize($serialized) { $this->__unserialize(unserialize($serialized)); } /** @param array<string, mixed> $data */ public function __unserialize(array $data): void { $this->sequenceName = $data['sequenceName']; $this->allocationSize = $data['allocationSize']; } }
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