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;
  }

}