protected T doExecute()

in grails-datastore-gorm-hibernate/src/main/groovy/org/grails/orm/hibernate/GrailsHibernateTemplate.java [280:324]
41 lines of code
12 McCabe index (conditional complexity)

    protected <T> T doExecute(HibernateCallback<T> action, boolean enforceNativeSession) throws DataAccessException {

        Assert.notNull(action, "Callback object must not be null");

        Session session = getSession();
        boolean existingTransaction = isSessionTransactional(session);
        if (existingTransaction) {
            LOG.debug("Found thread-bound Session for HibernateTemplate");
        }

        FlushMode previousFlushMode = null;
        try {
            previousFlushMode = applyFlushMode(session, existingTransaction);
            if (shouldPassReadOnlyToHibernate()) {
                session.setDefaultReadOnly(true);
            }
            Session sessionToExpose = (enforceNativeSession || exposeNativeSession ? session : createSessionProxy(session));
            T result = action.doInHibernate(sessionToExpose);
            flushIfNecessary(session, existingTransaction);
            return result;
        } catch (HibernateException ex) {
            throw convertHibernateAccessException(ex);
        }
        catch (PersistenceException ex) {
            if (ex.getCause() instanceof HibernateException) {
                throw SessionFactoryUtils.convertHibernateAccessException((HibernateException) ex.getCause());
            }
            throw ex;
        }
        catch (SQLException ex) {
            throw jdbcExceptionTranslator.translate("Hibernate-related JDBC operation", null, ex);
        } catch (RuntimeException ex) {
            // Callback code threw application exception...
            throw ex;
        } finally {
            if (existingTransaction) {
                LOG.debug("Not closing pre-bound Hibernate Session after HibernateTemplate");
                if (previousFlushMode != null) {
                    session.setHibernateFlushMode(previousFlushMode);
                }
            } else {
                SessionFactoryUtils.closeSession(session);
            }
        }
    }