TransactionManager.php

<?php

declare (strict_types=1);
namespace Drupal\mysql\Driver\Database\mysql;

use Drupal\Core\Database\Transaction\ClientConnectionTransactionState;
use Drupal\Core\Database\Transaction\TransactionManagerBase;

/**
 * MySql implementation of TransactionManagerInterface.
 *
 * MySQL will automatically commit transactions when tables are altered or
 * created (DDL transactions are not supported). However, pdo_mysql tracks
 * whether a client connection is still active and we can prevent triggering
 * exceptions.
 */
class TransactionManager extends TransactionManagerBase {
    
    /**
     * {@inheritdoc}
     */
    protected function beginClientTransaction() : bool {
        return $this->connection
            ->getClientConnection()
            ->beginTransaction();
    }
    
    /**
     * {@inheritdoc}
     */
    protected function processRootCommit() : void {
        if (!$this->connection
            ->getClientConnection()
            ->inTransaction()) {
            $this->voidClientTransaction();
            return;
        }
        parent::processRootCommit();
    }
    
    /**
     * {@inheritdoc}
     */
    protected function rollbackClientSavepoint(string $name) : bool {
        if (!$this->connection
            ->getClientConnection()
            ->inTransaction()) {
            $this->voidClientTransaction();
            return TRUE;
        }
        return parent::rollbackClientSavepoint($name);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function releaseClientSavepoint(string $name) : bool {
        if (!$this->connection
            ->getClientConnection()
            ->inTransaction()) {
            $this->voidClientTransaction();
            return TRUE;
        }
        return parent::releaseClientSavepoint($name);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function commitClientTransaction() : bool {
        $clientCommit = $this->connection
            ->getClientConnection()
            ->commit();
        $this->setConnectionTransactionState($clientCommit ? ClientConnectionTransactionState::Committed : ClientConnectionTransactionState::CommitFailed);
        return $clientCommit;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function rollbackClientTransaction() : bool {
        if (!$this->connection
            ->getClientConnection()
            ->inTransaction()) {
            $this->voidClientTransaction();
            return FALSE;
        }
        $clientRollback = $this->connection
            ->getClientConnection()
            ->rollBack();
        $this->setConnectionTransactionState($clientRollback ? ClientConnectionTransactionState::RolledBack : ClientConnectionTransactionState::RollbackFailed);
        return $clientRollback;
    }

}