presto-main/src/main/java/io/prestosql/server/CoordinatorModule.java/CoordinatorModule/createTransactionManager
class CoordinatorModule:    @Provides
    @Singleton
    public static TransactionManager createTransactionManager(
            TransactionManagerConfig config,
            CatalogManager catalogManager,
            @ForTransactionManager ScheduledExecutorService idleCheckExecutor,
            @ForTransactionManager ExecutorService finishingExecutor)
    {
        return InMemoryTransactionManager.create(config, idleCheckExecutor, catalogManager, finishingExecutor);
    }