io.vertigo.database.plugins.sql.connection.hibernate.HibernateConnectionProviderPlugin.java Source code

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Here is the source code for io.vertigo.database.plugins.sql.connection.hibernate.HibernateConnectionProviderPlugin.java

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/**
 * vertigo - simple java starter
 *
 * Copyright (C) 2013-2017, KleeGroup, direction.technique@kleegroup.com (http://www.kleegroup.com)
 * KleeGroup, Centre d'affaire la Boursidiere - BP 159 - 92357 Le Plessis Robinson Cedex - France
 *
 * 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 io.vertigo.database.plugins.sql.connection.hibernate;

import java.util.Optional;

import javax.inject.Inject;
import javax.inject.Named;
import javax.persistence.EntityManager;
import javax.persistence.Persistence;

import org.hibernate.Session;

import io.vertigo.commons.transaction.VTransaction;
import io.vertigo.commons.transaction.VTransactionManager;
import io.vertigo.database.plugins.sql.connection.AbstractSqlConnectionProviderPlugin;
import io.vertigo.database.sql.SqlDataBaseManager;
import io.vertigo.database.sql.connection.SqlConnection;
import io.vertigo.database.sql.vendor.SqlDataBase;
import io.vertigo.lang.Assertion;
import io.vertigo.util.ClassUtil;

/**
 * ConnectionProvider permettant la connexion  une datasource Java.
 *
 * @author pchretien, npiedeloup
 */
public final class HibernateConnectionProviderPlugin extends AbstractSqlConnectionProviderPlugin {
    private final VTransactionManager transactionManager;

    /**
     * Constructor.
     * @param name ConnectionProvider's name
     * @param dataBaseName Nom du type de base de donnes
     * @param persistenceUnit Nom de la persistenceUnit  utiliser (dans le persistence.xml)
     * @param transactionManager Transaction manager
     */
    @Inject
    public HibernateConnectionProviderPlugin(@Named("name") final Optional<String> name,
            @Named("persistenceUnit") final String persistenceUnit,
            @Named("dataBaseName") final String dataBaseName, final VTransactionManager transactionManager) {
        super(name.orElse(SqlDataBaseManager.MAIN_CONNECTION_PROVIDER_NAME), new JpaDataBase(
                createDataBase(dataBaseName), Persistence.createEntityManagerFactory(persistenceUnit)));
        Assertion.checkArgNotEmpty(persistenceUnit);
        Assertion.checkNotNull(transactionManager);
        //-----
        this.transactionManager = transactionManager;
    }

    /**
     * @param em EntityManager
     * @return the sqlConnection
     */
    private SqlConnection obtainWrappedConnection(final EntityManager em) {
        //preconisation StackOverFlow to get current jpa connection
        final Session session = em.unwrap(Session.class);
        return session.doReturningWork(connection -> new SqlConnection(connection, getDataBase(), false));

    }

    /** {@inheritDoc} */
    @Override
    public SqlConnection obtainConnection() {
        final EntityManager em = obtainJpaResource().getEntityManager();
        return obtainWrappedConnection(em);
    }

    /** rcupre la ressource JPA de la transaction et la cr si ncessaire. */
    private JpaResource obtainJpaResource() {
        final SqlDataBase dataBase = getDataBase();
        Assertion.checkState(dataBase instanceof JpaDataBase, "DataBase must be a JpaDataBase (current:{0}).",
                dataBase.getClass());
        return ((JpaDataBase) dataBase).obtainJpaResource(getCurrentTransaction());
    }

    /** rcupre la transaction courante. */
    private VTransaction getCurrentTransaction() {
        return transactionManager.getCurrentTransaction();
    }

    private static SqlDataBase createDataBase(final String dataBaseName) {
        return ClassUtil.newInstance(dataBaseName, SqlDataBase.class);
    }
}