Example usage for javax.persistence EntityManagerFactory createEntityManager

Introduction

In this page you can find the example usage for javax.persistence EntityManagerFactory createEntityManager.

Prototype

public EntityManager createEntityManager();

Source Link

Document

Create a new application-managed EntityManager.

Usage

From source file:org.rhq.server.metrics.migrator.DataMigratorRunner.java

private void run() throws Exception {
    log.debug("Creating Entity Manager");
    EntityManagerFactory entityManagerFactory = this.createEntityManagerFactory();
    EntityManager entityManager = entityManagerFactory.createEntityManager();
    log.debug("Done creating Entity Manager");

    log.debug("Creating Cassandra session");
    Session cassandraSession = this.createCassandraSession();
    log.debug("Done creating Cassandra session");

    DatabaseType databaseType = DatabaseType.Postgres;
    if (configuration.get(sqlServerTypeOption) != null) {
        databaseType = (DatabaseType) configuration.get(sqlServerTypeOption);
    }/*  ww  w. j a va 2s .  co m*/

    DataMigrator migrator = new DataMigrator(entityManager, cassandraSession, databaseType,
            tryParseBoolean(configuration.get(experimentalExportOption), false));

    if (!(Boolean) configuration.get(deleteOnlyOption)) {
        if ((Boolean) configuration.get(deleteDataOption)) {
            migrator.deleteAllDataAtEndOfMigration();
        } else {
            migrator.preserveData();
        }

        migrator.runRawDataMigration(!(Boolean) configuration.get(disableRawOption));
        migrator.run1HAggregateDataMigration(!(Boolean) configuration.get(disable1HOption));
        migrator.run6HAggregateDataMigration(!(Boolean) configuration.get(disable6HOption));
        migrator.run1DAggregateDataMigration(!(Boolean) configuration.get(disable1DOption));

        System.out.println("Estimation process - starting\n");
        long estimate = migrator.estimate();
        System.out.println("The migration process will take approximately: "
                + TimeUnit.MILLISECONDS.toMinutes(estimate) + " minutes (or " + estimate + " milliseconds)\n");
        System.out.println("Estimation process - ended\n\n");

        if (!(Boolean) configuration.get(estimateOnlyOption)) {
            System.out.println("Migration process - starting\n");
            long startTime = System.currentTimeMillis();
            migrator.migrateData();
            long duration = System.currentTimeMillis() - startTime;
            System.out.println("The migration process took: " + TimeUnit.MILLISECONDS.toMinutes(duration)
                    + " minutes (or " + duration + " milliseconds)\n");
            System.out.println("Migration process - ended\n");
        }
    } else {
        migrator.deleteAllDataAtEndOfMigration();
        migrator.runRawDataMigration(false);
        migrator.run1HAggregateDataMigration(false);
        migrator.run6HAggregateDataMigration(false);
        migrator.run1DAggregateDataMigration(false);

        System.out.println("Estimation process - starting\n");
        long estimate = migrator.estimate();
        System.out.println("The deletion of old data will take approximately: "
                + TimeUnit.MILLISECONDS.toMinutes(estimate) + " minutes (or " + estimate + " milliseconds)\n");
        System.out.println("Estimation process - ended\n\n");

        if (!(Boolean) configuration.get(estimateOnlyOption)) {
            migrator.runRawDataMigration(true);
            migrator.run1HAggregateDataMigration(true);
            migrator.run6HAggregateDataMigration(true);
            migrator.run1DAggregateDataMigration(true);

            System.out.println("Old data deletion process - starting\n");
            long startTime = System.currentTimeMillis();
            migrator.deleteOldData();
            long duration = System.currentTimeMillis() - startTime;
            System.out.println("The deletion process took: " + TimeUnit.MILLISECONDS.toMinutes(duration)
                    + " minutes (or " + duration + " milliseconds)\n");
            System.out.println("Old data deletion process - ended\n");
        }
    }

    this.closeCassandraSession(cassandraSession);
    this.closeEntityManagerFactory(entityManagerFactory);
}

---

From source file:org.drools.semantics.lang.dl.DL_9_CompilationTest.java

private void checkSQLRefresh(Object obj, ClassLoader urlk, String punit) {
    ClassLoader oldKL = Thread.currentThread().getContextClassLoader();
    EntityManagerFactory emf = null;
    EntityManager em = null;/*  w  w w . ja  v a 2 s  .c om*/
    try {
        Thread.currentThread().setContextClassLoader(urlk);

        HashMap props = new HashMap();
        props.put("hibernate.hbm2ddl.auto", "create-drop");
        emf = Persistence.createEntityManagerFactory(punit, props);

        em = emf.createEntityManager();

        checkJPARefresh(obj, ((UIdAble) obj).getDyEntryId(), em);

    } finally {
        Thread.currentThread().setContextClassLoader(oldKL);
        if (em != null && em.isOpen()) {
            em.clear();
            em.close();
        }
        if (emf != null && emf.isOpen()) {
            emf.close();
        }
    }

}

---

From source file:de.zib.gndms.infra.system.GNDMSystem.java

/**
 * Returns a list of all {@link org.globus.wsrf.Resource}s, which are managed by an EntityManager, corresponding to
 * the given EntityManagerFactory and//  w  ww . j a  v a  2 s  .  co  m
 * which are managed by the {@code GNDMPersistentServiceHome} {@link de.zib.gndms.infra.system.GNDMSystemDirectory#getHome(Class)}    
 *
 * @param emg the factory to create the EntityManager, used for the {@code list all} query
 * @param clazz the class, whose corresponding GNDMPersistentServiceHome will be used for the query.(See {@link de.zib.gndms.infra.system.GNDMSystemDirectory#homes})
 * @param <M> the model type
 * @return  a list of all {@code Resources}, corresponding to a specific EntityManager and GNDMPersistentServiceHome.
 */
public final @NotNull <M extends GridResource> List<String> listAllResources(
        final @NotNull EntityManagerFactory emg, final @NotNull Class<M> clazz) {
    final EntityManager manager = emg.createEntityManager();
    List<String> retList = null;
    try {
        try {
            manager.getTransaction().begin();
            retList = listAllResources(getInstanceDir().getHome(clazz), manager);
            manager.getTransaction().commit();
        } finally {
            if (manager.getTransaction().isActive())
                manager.getTransaction().rollback();
        }
    } finally {
        if (manager.isOpen())
            manager.close();
    }
    return retList;
}

---

From source file:it.webappcommon.lib.jpa.ControllerStandard.java

public <T extends EntityBaseStandard> T find(Class<T> classObj, Object id) throws Exception {
    T returnValue = null;/*from  www .j  a  va  2s .co  m*/

    EntityManagerFactory emf = null;
    EntityManager em = null;
    try {
        emf = getEntityManagerFactory();
        em = emf.createEntityManager();

        returnValue = (T) em.find(classObj, id);
    } catch (Exception e) {
        // logger.error("Errore su find di controller : " + e.getMessage() +
        // " " + e.getCause() != null ? e.getCause().getMessage() : "");
        ExceptionLogger.logExceptionWithCause(logger, e);
        throw e;
    } finally {
        if (!passedEm) {
            PersistenceManagerUtil.close(em);
        }
        em = null;
    }
    return returnValue;
}

---

From source file:it.webappcommon.lib.jpa.ControllerStandard.java

/**
 * Usato specialmente per aggiornare dopo un salvataggio. Nel caso delle
 * applicazioni web usiamo em che si chiude dopo la request quindi gli
 * oggetti non si aggiornano in automatico dopo il salvataggio.
 * //from w ww.ja v a2s  .  c o m
 * @param <T>
 * @param classObj
 * @param id
 * @return
 * @throws Exception
 */
public <T extends EntityBaseStandard> T findAndRefresh(Class<T> classObj, Object id) throws Exception {
    T returnValue = null;

    EntityManagerFactory emf = null;
    EntityManager em = null;
    try {
        emf = getEntityManagerFactory();
        em = emf.createEntityManager();

        returnValue = (T) em.find(classObj, id);

        if (returnValue != null) {
            // if (lazyCloseEM) {
            em.refresh(returnValue);
            // }
        }

    } catch (Exception e) {
        // logger.error("Errore su find di controller : " + e.getMessage() +
        // " " + e.getCause() != null ? e.getCause().getMessage() : "");
        ExceptionLogger.logExceptionWithCause(logger, e);
        throw e;
    } finally {
        if (!passedEm) {
            PersistenceManagerUtil.close(em);
        }
        em = null;
    }
    return returnValue;
}

---

From source file:it.webappcommon.lib.jpa.ControllerStandard.java

/**
 * //  www.j  a  v  a2 s  .  c  o  m
 * Restituisce loggetto relativo specificando classe ed id
 * 
 * @param classObj
 * @param id
 * @return EntityBase
 * @throws java.lang.Exception
 */
public <T extends EntityBaseStandard> T find2(Class<T> classObj, Object id) throws Exception {
    T returnValue = null;

    EntityManagerFactory emf = null;
    EntityManager em = null;
    try {
        /* Istanzio l'entity manager */
        emf = getEntityManagerFactory();
        em = emf.createEntityManager();

        /* Calcolo l'oggetto */
        returnValue = (T) em.find(classObj, id);
    } catch (Exception e) {
        throw e;
    } finally {
        if (!passedEm) {
            PersistenceManagerUtil.close(em);
        }
        em = null;
    }
    return returnValue;
}

---

From source file:it.webappcommon.lib.jpa.ControllerStandard.java

public int getItemCount(Class classObj) throws Exception {
    int returnValue = 0;

    EntityManagerFactory emf = null;
    EntityManager em = null;//from w w w . j av  a  2s.  c o  m
    Query q = null;
    StringBuffer hsqlQuery = null;
    try {
        emf = getEntityManagerFactory();
        em = emf.createEntityManager();

        hsqlQuery = new StringBuffer();
        hsqlQuery.append("select count(*) from ");
        hsqlQuery.append(classObj.getCanonicalName());
        hsqlQuery.append(" as o");
        q = em.createQuery(hsqlQuery.toString());
        returnValue = ((Long) q.getSingleResult()).intValue();
    } catch (Exception e) {
        throw e;
    } finally {
        if (!passedEm) {
            PersistenceManagerUtil.close(em);
        }
        em = null;
        q = null;
        hsqlQuery = null;
    }
    return returnValue;
}

---

From source file:it.webappcommon.lib.jpa.ControllerStandard.java

/**
 * /*ww w  . j a v  a 2 s  .co  m*/
 * Metodo che restituisce il numero di elementi dato un certo tipo
 * 
 * @param classObj
 * @return
 * @throws java.lang.Exception
 */
public <T extends EntityBaseStandard> int getItemCount3(Class<T> classObj) throws Exception {
    int returnValue = 0;

    StringBuffer hsqlQuery = null;
    EntityManagerFactory emf = null;
    EntityManager em = null;
    Query q = null;
    try {
        /* Istanzio l'entity manager */
        emf = getEntityManagerFactory();
        em = emf.createEntityManager();

        /* Creo la query */
        hsqlQuery = new StringBuffer();
        hsqlQuery.append("select count(*) from "); // hsqlQuery.append("select count(o) from ");
        // ho cambiato
        hsqlQuery.append(classObj.getCanonicalName());
        hsqlQuery.append(" as o");
        q = em.createQuery(hsqlQuery.toString());

        /* Istanzio il valore di retutn */
        returnValue = ((Long) q.getSingleResult()).intValue();
    } catch (Exception e) {
        throw e;
    } finally {
        if (!passedEm) {
            PersistenceManagerUtil.close(em);
        }
        hsqlQuery = null;
        em = null;
        q = null;
    }
    return returnValue;
}

---

From source file:it.webappcommon.lib.jpa.ControllerStandard.java

public <T extends EntityBaseStandard> List<String> getDisinctStringValues(Class<T> classObj, String property)
        throws Exception {
    List<String> returnValue = null;

    StringBuffer hsqlQuery = null;
    EntityManagerFactory emf = null;
    EntityManager em = null;/*w w  w  .  j  a v  a 2  s  .co m*/
    Query q = null;
    try {
        /* Istanzio l'entity manager */
        emf = getEntityManagerFactory();
        em = emf.createEntityManager();

        /* Creo la query */
        hsqlQuery = new StringBuffer();
        hsqlQuery.append("select distinct(o." + property + ") from ");
        hsqlQuery.append(classObj.getCanonicalName());
        hsqlQuery.append(" as o");

        q = em.createQuery(hsqlQuery.toString());

        /* Istanzio il valore di retutn */
        returnValue = q.getResultList();
    } catch (Exception e) {
        throw e;
    } finally {
        if (!passedEm) {
            PersistenceManagerUtil.close(em);
        }
        hsqlQuery = null;
        em = null;
        q = null;
    }
    return returnValue;
}

---

From source file:it.webappcommon.lib.jpa.ControllerStandard.java

public int getItemCount(Class classObj, String query, Map<String, Object> map) throws Exception {
    int returnValue = 0;

    EntityManagerFactory emf = null;
    EntityManager em = null;/* w  w  w.  j a v  a  2s .c o m*/
    Query q = null;
    Iterator i = null;
    Map.Entry entry = null;
    try {
        emf = getEntityManagerFactory();
        em = emf.createEntityManager();

        q = em.createNamedQuery(query);

        if (map != null) {
            for (i = map.entrySet().iterator(); i.hasNext();) {
                entry = (Map.Entry) i.next();
                q.setParameter((String) entry.getKey(), entry.getValue());
            }
        }
        returnValue = ((Long) q.getSingleResult()).intValue();
    } catch (Exception e) {
        throw e;
    } finally {
        if (!passedEm) {
            PersistenceManagerUtil.close(em);
        }
        em = null;
        q = null;
        i = null;
        entry = null;
    }
    return returnValue;
}

---

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