Examples of org.eclipse.persistence.descriptors.FetchGroupManager

Package org.eclipse.persistence.descriptors

Examples of org.eclipse.persistence.descriptors.FetchGroupManager

org.eclipse.persistence.descriptors.FetchGroupManager

Purpose: The fetch group manager controls the named fetch groups defined at the descriptor level. EclipseLink supports multiple, overlapped fetch groups, optionally with one of them as the default fetch group.
The domain object must implement org.eclipse.persistence.queries.FetchGroupTracker interface, in order to make use of the fetch group performance enhancement feature.
Please refer to FetchGroup class for the pros and cons of fetch group usage. @see org.eclipse.persistence.queries.FetchGroup @see org.eclipse.persistence.queries.FetchGroupTracker @author King Wang @since TopLink 10.1.3.


        // PERF: Avoid synchronized enumerator as is concurrency bottleneck.
        List mappings = getCloningMappings();
        int size = mappings.size();
        if (descriptor.hasFetchGroupManager() && descriptor.getFetchGroupManager().isPartialObject(clone)) {
            FetchGroupManager fetchGroupManager = descriptor.getFetchGroupManager();
            for (int index = 0; index < size; index++) {
                DatabaseMapping mapping = (DatabaseMapping)mappings.get(index);
                if (fetchGroupManager.isAttributeFetched(clone, mapping.getAttributeName())) {
                    mapping.buildBackupClone(clone, backup, unitOfWork);
                }
            }
        } else {
            for (int index = 0; index < size; index++) {

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        ObjectBuilder builder = this.descriptor.getObjectBuilder();
        // PERF: Only process relationships.
        if (!builder.isSimple()) {
            List<DatabaseMapping> mappings = builder.getRelationshipMappings();
            int size = mappings.size();
            FetchGroupManager fetchGroupManager = descriptor.getFetchGroupManager();
            // Only cascade fetched mappings.
            if ((fetchGroupManager != null) && fetchGroupManager.isPartialObject(object)) {
                for (int index = 0; index < size; index++) {
                    DatabaseMapping mapping = mappings.get(index);
                    if (fetchGroupManager.isAttributeFetched(object, mapping.getAttributeName())) {
                        mapping.cascadeDiscoverAndPersistUnregisteredNewObjects(object, newObjects, unregisteredExistingObjects, visitedObjects, uow);
                    }
                }
            } else {
                for (int index = 0; index < size; index++) {

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        ObjectBuilder builder = this.descriptor.getObjectBuilder();
        // PERF: Only process relationships.
        if (!builder.isSimple()) {
            List<DatabaseMapping> mappings = builder.getRelationshipMappings();
            int size = mappings.size();
            FetchGroupManager fetchGroupManager = descriptor.getFetchGroupManager();
            // Only cascade fetched mappings.
            if ((fetchGroupManager != null) && fetchGroupManager.isPartialObject(object)) {
                for (int index = 0; index < size; index++) {
                    DatabaseMapping mapping = mappings.get(index);
                    if (fetchGroupManager.isAttributeFetched(object, mapping.getAttributeName())) {
                        mapping.cascadeRegisterNewIfRequired(object, uow, visitedObjects);
                    }
                }
            } else {
                for (int index = 0; index < size; index++) {

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     */
    public void populateAttributesForClone(Object original, Object clone, UnitOfWorkImpl unitOfWork) {
        List mappings = getCloningMappings();
        int size = mappings.size();
        if (this.descriptor.hasFetchGroupManager() && this.descriptor.getFetchGroupManager().isPartialObject(original)) {
            FetchGroupManager fetchGroupManager = this.descriptor.getFetchGroupManager();
            for (int index = 0; index < size; index++) {
                DatabaseMapping mapping = (DatabaseMapping)mappings.get(index);
                if (fetchGroupManager.isAttributeFetched(original, mapping.getAttributeName())) {
                    mapping.buildClone(original, clone, unitOfWork);
                }
            }
        } else {
            for (int index = 0; index < size; index++) {

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        ObjectBuilder builder = descriptor.getObjectBuilder();
        // Only relationship mappings need to be reset.
        if (!builder.isSimple()) {
            dissableEventProcessing(clone);
            // Must also ensure the listener has been set on collections and aggregates.
            FetchGroupManager fetchGroupManager = descriptor.getFetchGroupManager();
            boolean isPartialObject = (fetchGroupManager != null) && fetchGroupManager.isPartialObject(clone);
            List mappings = builder.getRelationshipMappings();
            int size = mappings.size();
            // Only cascade fetched mappings.
            for (int index = 0; index < size; index++) {
                DatabaseMapping mapping = (DatabaseMapping)mappings.get(index);
                if (!isPartialObject || fetchGroupManager.isAttributeFetched(clone, mapping.getAttributeName())) {
                    mapping.setChangeListener(clone, listener, uow);
                }
            }
            enableEventProcessing(clone);
        }

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            descriptor = mapping.getDescriptor();
        }


        //fetch group support
        if (descriptor.hasFetchGroupManager()) {
            FetchGroupManager fetchGroupManager = descriptor.getFetchGroupManager();
            if (fetchGroupManager.isPartialObject(object) && (!fetchGroupManager.isAttributeFetched(object, mapping.getAttributeName()))) {
                //the conforming attribute is not fetched, simply throw exception
                throw QueryException.cannotConformUnfetchedAttribute(mapping.getAttributeName());
            }
        }

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     * Traverse the object and acquire locks on all related objects.
     */
    public CacheKey traverseRelatedLocks(Object objectForClone, Map lockedObjects, Map refreshedObjects, ClassDescriptor descriptor, AbstractSession session, UnitOfWorkImpl unitOfWork) {
        // If all mappings have indirection short-circuit.
        if (descriptor.shouldAcquireCascadedLocks()) {
            FetchGroupManager fetchGroupManager = descriptor.getFetchGroupManager();
            boolean isPartialObject = (fetchGroupManager != null) && fetchGroupManager.isPartialObject(objectForClone);
            for (Iterator mappings = descriptor.getLockableMappings().iterator();
                     mappings.hasNext();) {
                DatabaseMapping mapping = (DatabaseMapping)mappings.next();
                // Only cascade fetched mappings.
                if (!isPartialObject || (fetchGroupManager.isAttributeFetched(objectForClone, mapping.getAttributeName()))) {
                    // any mapping in this list must not have indirection.
                    Object objectToLock = mapping.getAttributeValueFromObject(objectForClone);
                    if (mapping.isCollectionMapping()) {
                        // Ignore null, means empty.
                        if (objectToLock != null) {

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    /**
     * INTERNAL:
     * Add mandatory attributes to fetch group, create entityFetchGroup.
     */
    public void prepareFetchGroup() throws QueryException {
        FetchGroupManager fetchGroupManager = this.descriptor.getFetchGroupManager();
        if (fetchGroupManager != null) {
            if (this.fetchGroup == null) {
                if (this.fetchGroupName != null) {
                    this.fetchGroup = fetchGroupManager.getFetchGroup(this.fetchGroupName);
                } else if (this.shouldUseDefaultFetchGroup) {
                    this.fetchGroup = this.descriptor.getFetchGroupManager().getDefaultFetchGroup();
                }
            }
            if (this.fetchGroup != null) {

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                }
            }
        }
        if (this.getDescriptor().hasFetchGroupManager() && FetchGroupTracker.class.isAssignableFrom(clonedDescriptor.getJavaClass())){
            if (clonedDescriptor.getFetchGroupManager() == null) {
                clonedDescriptor.setFetchGroupManager(new FetchGroupManager());
            }
        }
    }

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            return this.cloneObject; 
        } else {
            if(this.cloneObject != null && session != null) {
                Object oldValue = this.descriptor.getObjectBuilder().buildNewInstance();
                FetchGroup fetchGroup = null;
                FetchGroupManager fetchGroupManager = this.descriptor.getFetchGroupManager(); 
                if(fetchGroupManager != null) {
                    fetchGroup = fetchGroupManager.getObjectFetchGroup(this.cloneObject);
                }
                for(DatabaseMapping mapping : this.descriptor.getMappings()) {
                    String attributeName = mapping.getAttributeName();
                    if(fetchGroup == null || fetchGroup.containsAttributeInternal(attributeName)) {
                        ChangeRecord changeRecord = (ChangeRecord)getChangesForAttributeNamed(attributeName);

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