# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 480
      def commit
        connection.commit_db_transaction if materialized?
        @state.full_commit!
        @instrumenter.finish(:commit) if materialized?
      end

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 450
      def materialize!
        if isolation_level
          connection.begin_isolated_db_transaction(isolation_level)
        else
          connection.begin_db_transaction
        end

        super
      end

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 460
      def restart
        return unless materialized?

        @instrumenter.finish(:restart)

        if connection.supports_restart_db_transaction?
          @instrumenter.start
          connection.restart_db_transaction
        else
          connection.rollback_db_transaction
          materialize!
        end
      end

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 474
      def rollback
        connection.rollback_db_transaction if materialized?
        @state.full_rollback!
        @instrumenter.finish(:rollback) if materialized?
      end