roryqi commented on code in PR #12234:
URL: https://github.com/apache/gravitino/pull/12234#discussion_r3703902723
##########
core/src/main/java/org/apache/gravitino/SupportsRelationOperations.java:
##########
@@ -217,7 +237,55 @@ default <E extends Entity & HasIdentifier> List<E>
updateEntityRelations(
NameIdentifier[] destEntitiesToAdd,
NameIdentifier[] destEntitiesToRemove)
throws IOException, NoSuchEntityException, EntityAlreadyExistsException {
+ return updateEntityRelations(
+ RelationUpdate.of(
+ relType,
+ srcEntityIdent,
+ srcEntityType,
+ toRelationEdgeTargets(relType, srcEntityType, destEntitiesToAdd),
+ toRelationEdgeTargets(relType, srcEntityType,
destEntitiesToRemove)));
+ }
+
+ /**
+ * Canonical relation update API. Implementations should add future
relation-edge update
+ * attributes to {@link RelationUpdate} or {@link RelationEdgeTarget}
instead of introducing new
+ * relation-specific overloads.
+ *
+ * @param <E> The type of the entity returned in the list, which represents
the final state of
+ * related entities.
+ * @param update The relation update.
+ * @return A list of entities that are related to the given entity after the
update.
+ * @throws IOException If a storage-related error occurs.
+ * @throws NoSuchEntityException If any of the specified entities does not
exist.
+ * @throws EntityAlreadyExistsException If a relation to be added already
exists.
+ */
+ default <E extends Entity & HasIdentifier> List<E>
updateEntityRelations(RelationUpdate update)
+ throws IOException, NoSuchEntityException, EntityAlreadyExistsException {
throw new UnsupportedOperationException(
- "updateEntityRelations is not supported by this implementation");
+ "updateEntityRelations with RelationUpdate is not supported by this
implementation");
+ }
+
+ private static RelationEdgeTarget[] toRelationEdgeTargets(
+ Type relType, Entity.EntityType srcEntityType, NameIdentifier[]
nameIdentifiers) {
+ if (nameIdentifiers == null) {
+ return null;
+ }
+
+ Entity.EntityType targetEntityType = relationDestinationType(relType,
srcEntityType);
+ return Arrays.stream(nameIdentifiers)
+ .map(nameIdentifier -> RelationEdgeTarget.of(nameIdentifier,
targetEntityType, null))
+ .toArray(RelationEdgeTarget[]::new);
+ }
+
+ private static Entity.EntityType relationDestinationType(
+ Type relType, Entity.EntityType srcEntityType) {
+ switch (relType) {
+ case POLICY_METADATA_OBJECT_REL:
Review Comment:
Clarified in `1e1f55001`. Reverse lookup still uses the same relation type:
querying metadata objects for a policy uses `POLICY_METADATA_OBJECT_REL` with
the policy as the `RelationQuery` anchor, and querying metadata objects for a
tag uses `TAG_METADATA_OBJECT_REL` with the tag as the anchor. The helper was
renamed to `relationUpdateTargetType` to make clear it is only for the legacy
update adapter target inference, not query result typing.
##########
core/src/main/java/org/apache/gravitino/RelationUpdate.java:
##########
@@ -0,0 +1,129 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.gravitino;
+
+import com.google.common.base.Preconditions;
+import java.util.Arrays;
+
+/**
+ * Describes a relation update from a source entity to target endpoints.
Target endpoint identity
+ * and relation-edge attributes are carried by {@link RelationEdgeTarget}.
+ */
+public final class RelationUpdate {
+
+ private static final RelationEdgeTarget[] EMPTY_TARGETS = new
RelationEdgeTarget[0];
+
+ private final SupportsRelationOperations.Type relationType;
+ private final NameIdentifier sourceIdentifier;
+ private final Entity.EntityType sourceEntityType;
+ private final RelationEdgeTarget[] targetsToAdd;
+ private final RelationEdgeTarget[] targetsToRemove;
+
+ private RelationUpdate(
+ SupportsRelationOperations.Type relationType,
+ NameIdentifier sourceIdentifier,
+ Entity.EntityType sourceEntityType,
+ RelationEdgeTarget[] targetsToAdd,
+ RelationEdgeTarget[] targetsToRemove) {
+ this.relationType = relationType;
+ this.sourceIdentifier = sourceIdentifier;
+ this.sourceEntityType = sourceEntityType;
+ this.targetsToAdd = copyTargets(targetsToAdd, "targetsToAdd");
+ this.targetsToRemove = copyTargets(targetsToRemove, "targetsToRemove");
+ }
+
+ /**
+ * Creates a relation update.
+ *
+ * @param relationType The type of relation.
+ * @param sourceIdentifier The identifier of the source entity whose
relations are being updated.
+ * @param sourceEntityType The source entity type.
+ * @param targetsToAdd Target endpoints to associate with the source entity.
+ * @param targetsToRemove Target endpoints to disassociate from the source
entity.
+ * @return A relation update.
+ */
+ public static RelationUpdate of(
+ SupportsRelationOperations.Type relationType,
+ NameIdentifier sourceIdentifier,
+ Entity.EntityType sourceEntityType,
+ RelationEdgeTarget[] targetsToAdd,
+ RelationEdgeTarget[] targetsToRemove) {
+ Preconditions.checkArgument(relationType != null, "relationType must not
be null");
+ Preconditions.checkArgument(sourceIdentifier != null, "sourceIdentifier
must not be null");
+ Preconditions.checkArgument(sourceEntityType != null, "sourceEntityType
must not be null");
+ return new RelationUpdate(
+ relationType, sourceIdentifier, sourceEntityType, targetsToAdd,
targetsToRemove);
+ }
+
+ /**
+ * @return The type of relation.
+ */
+ public SupportsRelationOperations.Type relationType() {
+ return relationType;
+ }
+
+ /**
+ * @return The source entity identifier.
+ */
+ public NameIdentifier sourceIdentifier() {
+ return sourceIdentifier;
+ }
+
+ /**
+ * @return The source entity type.
+ */
+ public Entity.EntityType sourceEntityType() {
+ return sourceEntityType;
+ }
+
+ /**
+ * @return Target endpoints to associate with the source entity.
+ */
+ public RelationEdgeTarget[] targetsToAdd() {
+ return targetsToAdd.clone();
+ }
+
+ /**
+ * @return Target endpoints to disassociate from the source entity.
+ */
+ public RelationEdgeTarget[] targetsToRemove() {
+ return targetsToRemove.clone();
Review Comment:
Clarified in `1e1f55001`. The clone is a defensive copy: `RelationUpdate` is
intended to be immutable, but Java arrays are mutable, so the constructor and
accessors copy arrays to prevent callers from mutating the stored update after
creation or through a returned array.
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