private Object assembleCacheEntry(
      final CacheEntry entry,
      final Serializable id,
      final EntityPersister persister,
      final LoadEvent event)
      throws HibernateException {

    final Object optionalObject = event.getInstanceToLoad();
    final EventSource session = event.getSession();
    final SessionFactoryImplementor factory = session.getFactory();

    if (log.isTraceEnabled()) {
      log.trace(
          "assembling entity from second-level cache: "
              + MessageHelper.infoString(persister, id, factory));
    }

    EntityPersister subclassPersister = factory.getEntityPersister(entry.getSubclass());
    Object result =
        optionalObject == null ? session.instantiate(subclassPersister, id) : optionalObject;

    // make it circular-reference safe
    TwoPhaseLoad.addUninitializedCachedEntity(
        new EntityKey(id, subclassPersister, session.getEntityMode()),
        result,
        subclassPersister,
        LockMode.NONE,
        entry.areLazyPropertiesUnfetched(),
        entry.getVersion(),
        session);

    Type[] types = subclassPersister.getPropertyTypes();
    Object[] values =
        entry.assemble(
            result,
            id,
            subclassPersister,
            session.getInterceptor(),
            session); // intializes result by side-effect
    TypeFactory.deepCopy(
        values, types, subclassPersister.getPropertyUpdateability(), values, session);

    Object version = Versioning.getVersion(values, subclassPersister);
    if (log.isTraceEnabled()) log.trace("Cached Version: " + version);

    final PersistenceContext persistenceContext = session.getPersistenceContext();
    persistenceContext.addEntry(
        result,
        Status.MANAGED,
        values,
        null,
        id,
        version,
        LockMode.NONE,
        true,
        subclassPersister,
        false,
        entry.areLazyPropertiesUnfetched());
    subclassPersister.afterInitialize(result, entry.areLazyPropertiesUnfetched(), session);
    persistenceContext.initializeNonLazyCollections();
    // upgrade the lock if necessary:
    // lock(result, lockMode);

    // PostLoad is needed for EJB3
    // TODO: reuse the PostLoadEvent...
    PostLoadEvent postLoadEvent =
        new PostLoadEvent(session).setEntity(result).setId(id).setPersister(persister);
    PostLoadEventListener[] listeners = session.getListeners().getPostLoadEventListeners();
    for (int i = 0; i < listeners.length; i++) {
      listeners[i].onPostLoad(postLoadEvent);
    }

    return result;
  }
Exemplo n.º 2
0
  /**
   * Perform the second step of 2-phase load. Fully initialize the entity instance.
   *
   * <p>After processing a JDBC result set, we "resolve" all the associations between the entities
   * which were instantiated and had their state "hydrated" into an array
   */
  public static void initializeEntity(
      final Object entity,
      final boolean readOnly,
      final SessionImplementor session,
      final PreLoadEvent preLoadEvent,
      final PostLoadEvent postLoadEvent)
      throws HibernateException {

    // TODO: Should this be an InitializeEntityEventListener??? (watch out for performance!)

    final PersistenceContext persistenceContext = session.getPersistenceContext();
    EntityEntry entityEntry = persistenceContext.getEntry(entity);
    if (entityEntry == null) {
      throw new AssertionFailure("possible non-threadsafe access to the session");
    }
    EntityPersister persister = entityEntry.getPersister();
    Serializable id = entityEntry.getId();
    Object[] hydratedState = entityEntry.getLoadedState();

    if (log.isDebugEnabled())
      log.debug(
          "resolving associations for "
              + MessageHelper.infoString(persister, id, session.getFactory()));

    Type[] types = persister.getPropertyTypes();
    for (int i = 0; i < hydratedState.length; i++) {
      final Object value = hydratedState[i];
      if (value != LazyPropertyInitializer.UNFETCHED_PROPERTY
          && value != BackrefPropertyAccessor.UNKNOWN) {
        hydratedState[i] = types[i].resolve(value, session, entity);
      }
    }

    // Must occur after resolving identifiers!
    if (session.isEventSource()) {
      preLoadEvent.setEntity(entity).setState(hydratedState).setId(id).setPersister(persister);
      PreLoadEventListener[] listeners = session.getListeners().getPreLoadEventListeners();
      for (int i = 0; i < listeners.length; i++) {
        listeners[i].onPreLoad(preLoadEvent);
      }
    }

    persister.setPropertyValues(entity, hydratedState, session.getEntityMode());

    final SessionFactoryImplementor factory = session.getFactory();
    if (persister.hasCache() && session.getCacheMode().isPutEnabled()) {

      if (log.isDebugEnabled())
        log.debug(
            "adding entity to second-level cache: "
                + MessageHelper.infoString(persister, id, session.getFactory()));

      Object version = Versioning.getVersion(hydratedState, persister);
      CacheEntry entry =
          new CacheEntry(
              hydratedState,
              persister,
              entityEntry.isLoadedWithLazyPropertiesUnfetched(),
              version,
              session,
              entity);
      CacheKey cacheKey =
          new CacheKey(
              id,
              persister.getIdentifierType(),
              persister.getRootEntityName(),
              session.getEntityMode(),
              session.getFactory());
      boolean put =
          persister
              .getCache()
              .put(
                  cacheKey,
                  persister.getCacheEntryStructure().structure(entry),
                  session.getTimestamp(),
                  version,
                  persister.isVersioned() ? persister.getVersionType().getComparator() : null,
                  useMinimalPuts(
                      session,
                      entityEntry)); // we could use persister.hasLazyProperties() instead of true

      if (put && factory.getStatistics().isStatisticsEnabled()) {
        factory
            .getStatisticsImplementor()
            .secondLevelCachePut(persister.getCache().getRegionName());
      }
    }

    if (readOnly || !persister.isMutable()) {
      // no need to take a snapshot - this is a
      // performance optimization, but not really
      // important, except for entities with huge
      // mutable property values
      persistenceContext.setEntryStatus(entityEntry, Status.READ_ONLY);
    } else {
      // take a snapshot
      TypeFactory.deepCopy(
          hydratedState,
          persister.getPropertyTypes(),
          persister.getPropertyUpdateability(),
          hydratedState, // after setting values to object, entityMode
          session);
      persistenceContext.setEntryStatus(entityEntry, Status.MANAGED);
    }

    persister.afterInitialize(entity, entityEntry.isLoadedWithLazyPropertiesUnfetched(), session);

    if (session.isEventSource()) {
      postLoadEvent.setEntity(entity).setId(id).setPersister(persister);
      PostLoadEventListener[] listeners = session.getListeners().getPostLoadEventListeners();
      for (int i = 0; i < listeners.length; i++) {
        listeners[i].onPostLoad(postLoadEvent);
      }
    }

    if (log.isDebugEnabled())
      log.debug(
          "done materializing entity "
              + MessageHelper.infoString(persister, id, session.getFactory()));

    if (factory.getStatistics().isStatisticsEnabled()) {
      factory.getStatisticsImplementor().loadEntity(persister.getEntityName());
    }
  }