StrixManager.java 文件源码

/**
 * Opens an {@link EntityManagerFactory} for the provided {@code persistenceUnit} if not already opened/cached.
 *
 * @param persistenceUnit The name of the persistence unit
 * @return The {@link EntityManagerFactory} for {@code persistenceUnit}
 */
private static synchronized EntityManagerFactory getEntityManagerFactory(String persistenceUnit) {
    if (persistenceUnit.isEmpty() && DEFAULT_PERSISTENCE_UNIT != null) {
        persistenceUnit = DEFAULT_PERSISTENCE_UNIT;
    }
    if (!SESSION_FACTORY_STORE.containsKey(persistenceUnit)) {
        LOG.debug("Create new EntityManagerFactory for persistence unit {}", persistenceUnit);
        SESSION_FACTORY_STORE.put(
              persistenceUnit,
              Persistence.createEntityManagerFactory(
                    persistenceUnit.isEmpty() ? null : persistenceUnit,
                    PERSISTENCE_PROPERTIES.get(persistenceUnit)
              )
        );
    }
    return SESSION_FACTORY_STORE.get(persistenceUnit);
}