debop4k.data.orm.hibernate.StatelessEx.java Source code

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Here is the source code for debop4k.data.orm.hibernate.StatelessEx.java

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/*
 * Copyright (c) 2016. Sunghyouk Bae <sunghyouk.bae@gmail.com>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package debop4k.data.orm.hibernate;

import kotlin.jvm.functions.Function1;
import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.internal.StatelessSessionImpl;
import org.springframework.transaction.annotation.Transactional;

import javax.persistence.EntityManager;
import java.sql.Connection;
import java.sql.SQLException;

import static debop4k.data.orm.hibernate.HibernateEx.getSessionFactory;

/**
 * {@link org.hibernate.StatelessSession} ? ? ? ?  .
 *
 * @author sunghyouk.bae@gmail.com
 */
@Slf4j
public final class StatelessEx {

    private StatelessEx() {
    }

    public static StatelessSessionImpl of(@NonNull SessionFactory factory) {
        return (StatelessSessionImpl) factory.openStatelessSession();
    }

    public static StatelessSessionImpl of(@NonNull Session session) {
        return of(session.getSessionFactory());
    }

    public static StatelessSessionImpl of(@NonNull EntityManager em) {
        return of(getSessionFactory(em));
    }

    public static <T> T withTransaction(@NonNull SessionFactory factory,
            @NonNull final Function1<StatelessSessionImpl, T> func) {
        StatelessSessionImpl stateless = of(factory);
        try {
            Transaction tx = stateless.beginTransaction();
            try {
                T result = func.invoke(stateless);
                tx.commit();
                return result;
            } catch (HibernateException e) {
                log.error("Hibernate StatelessSession  ?  ?.", e);
                tx.rollback();
                return null;
            }
        } finally {
            if (stateless != null && !stateless.isClosed())
                stateless.close();
        }
    }

    @Transactional
    public static <T> T withTransaction(@NonNull EntityManager em,
            @NonNull Function1<StatelessSessionImpl, T> func) {
        return withTransaction(getSessionFactory(em), func);
    }

    /**
     * DB?  ?  ? .
     *
     * @param factory hibernate session factory
     * @param func    ? 
     * @param <T>     ?? ? 
     * @return ?? 
     * @deprecated {@literal @}Transactional(readOnly=true)  .
     */
    @Deprecated
    @Transactional(readOnly = true)
    public static <T> T withReadOnly(@NonNull SessionFactory factory,
            @NonNull Function1<StatelessSessionImpl, T> func) {
        StatelessSessionImpl stateless = of(factory);
        try {
            Connection conn = stateless.connection();
            conn.setReadOnly(true);
            conn.setAutoCommit(false);
            Transaction tx = stateless.beginTransaction();
            try {
                T result = func.invoke(stateless);
                tx.commit();
                return result;
            } catch (Exception e) {
                log.error("Hibernate StatelessSession  ?  ?.", e);
                tx.rollback();
                return null;
            }
        } catch (SQLException e) {
            log.error("Connection ? ?  ?.", e);
            throw new RuntimeException(e);
        } finally {
            if (stateless != null && !stateless.isClosed())
                stateless.close();
        }
    }

    /**
     * DB?  ?  ? .
     *
     * @param em   JPA entity manager.
     * @param func ? 
     * @param <T>  ?? ? 
     * @return ?? 
     * @deprecated {@literal @}Transactional(readOnly=true)  .
     */
    @Deprecated
    @Transactional(readOnly = true)
    public static <T> T withReadOnly(@NonNull EntityManager em, @NonNull Function1<StatelessSessionImpl, T> func) {
        return withReadOnly(getSessionFactory(em), func);
    }
}