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.

        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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            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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        // 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++) {

View Full Code Here

        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++) {

View Full Code Here

     */
    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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     * Traverse the object and acquire locks on all related objects.
     */
    public CacheKey traverseRelatedLocks(Object objectForClone, Map lockedObjects, Map refreshedObjects, ClassDescriptor descriptor, AbstractSession cloningSession) {
        // 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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