mchades commented on code in PR #12565:
URL: https://github.com/apache/gravitino/pull/12565#discussion_r3853556834


##########
core/src/main/java/org/apache/gravitino/catalog/SemanticModelOperationDispatcher.java:
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@@ -0,0 +1,152 @@
+/*
+ * 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.catalog;
+
+import com.google.common.base.Preconditions;
+import java.util.Arrays;
+import java.util.Map;
+import javax.annotation.Nullable;
+import org.apache.gravitino.Catalog;
+import org.apache.gravitino.EntityStore;
+import org.apache.gravitino.NameIdentifier;
+import org.apache.gravitino.Namespace;
+import org.apache.gravitino.exceptions.IllegalSemanticModelException;
+import org.apache.gravitino.exceptions.NoSuchSchemaException;
+import org.apache.gravitino.exceptions.NoSuchSemanticModelException;
+import org.apache.gravitino.exceptions.SemanticModelAlreadyExistsException;
+import org.apache.gravitino.lock.LockType;
+import org.apache.gravitino.lock.TreeLockUtils;
+import org.apache.gravitino.secret.SecretManager;
+import org.apache.gravitino.semantic.SemanticModel;
+import org.apache.gravitino.semantic.SemanticModelChange;
+import org.apache.gravitino.semantic.SemanticModelDefinition;
+import org.apache.gravitino.storage.IdGenerator;
+
+/** Dispatches always-managed Semantic Model operations to Gravitino's 
EntityStore. */
+public class SemanticModelOperationDispatcher extends OperationDispatcher
+    implements SemanticModelDispatcher {
+
+  private final CatalogManager catalogManager;
+  private final SchemaDispatcher schemaDispatcher;
+  private final ManagedSemanticModelOperations managedOperations;
+
+  /**
+   * Creates a Semantic Model operation dispatcher.
+   *
+   * @param catalogManager The catalog manager.
+   * @param schemaDispatcher The internal schema dispatcher used for parent 
validation.
+   * @param store The EntityStore used for Semantic Model persistence.
+   * @param idGenerator The stable entity ID generator.
+   * @param secretManager The secret manager required by the operation 
dispatcher base class.
+   */
+  public SemanticModelOperationDispatcher(
+      CatalogManager catalogManager,
+      SchemaDispatcher schemaDispatcher,
+      EntityStore store,
+      IdGenerator idGenerator,
+      SecretManager secretManager) {
+    super(catalogManager, store, idGenerator, secretManager);
+    this.catalogManager = catalogManager;
+    this.schemaDispatcher = schemaDispatcher;
+    this.managedOperations = new ManagedSemanticModelOperations(store, 
idGenerator);
+  }
+
+  @Override
+  public NameIdentifier[] listSemanticModels(Namespace namespace) throws 
NoSuchSchemaException {
+    checkRelationalCatalog(namespace);
+    NameIdentifier schemaIdent = NameIdentifier.of(namespace.levels());
+    schemaDispatcher.loadSchema(schemaIdent);
+    return TreeLockUtils.doWithTreeLock(
+        schemaIdent, LockType.READ, () -> 
managedOperations.listSemanticModels(namespace));
+  }
+
+  @Override
+  public SemanticModel loadSemanticModel(NameIdentifier ident) throws 
NoSuchSemanticModelException {
+    checkRelationalCatalog(ident.namespace());
+    if (!schemaDispatcher.schemaExists(schemaIdentifier(ident))) {
+      throw new NoSuchSemanticModelException("Semantic Model %s does not 
exist", ident);
+    }
+    return TreeLockUtils.doWithTreeLock(
+        ident, LockType.READ, () -> 
managedOperations.loadSemanticModel(ident));
+  }
+
+  @Override
+  public SemanticModel createSemanticModel(
+      NameIdentifier ident,
+      @Nullable String comment,
+      SemanticModelDefinition definition,
+      Map<String, String> properties)
+      throws NoSuchSchemaException, SemanticModelAlreadyExistsException,
+          IllegalSemanticModelException {
+    Preconditions.checkArgument(definition != null, "Definition must not be 
null");
+    Preconditions.checkArgument(properties != null, "Properties must not be 
null");
+    checkRelationalCatalog(ident.namespace());
+    NameIdentifier schemaIdent = schemaIdentifier(ident);
+    schemaDispatcher.loadSchema(schemaIdent);
+    return TreeLockUtils.doWithTreeLock(
+        schemaIdent,
+        LockType.WRITE,
+        () -> managedOperations.createSemanticModel(ident, comment, 
definition, properties));
+  }
+
+  @Override
+  public SemanticModel alterSemanticModel(NameIdentifier ident, 
SemanticModelChange... changes)
+      throws NoSuchSemanticModelException, SemanticModelAlreadyExistsException,
+          IllegalSemanticModelException {
+    Preconditions.checkArgument(
+        changes != null && changes.length > 0, "At least one change is 
required");
+    checkRelationalCatalog(ident.namespace());
+    NameIdentifier schemaIdent = schemaIdentifier(ident);
+    if (!schemaDispatcher.schemaExists(schemaIdent)) {
+      throw new NoSuchSemanticModelException("Semantic Model %s does not 
exist", ident);
+    }
+
+    boolean renaming =
+        Arrays.stream(changes)
+            .anyMatch(change -> change instanceof 
SemanticModelChange.RenameSemanticModel);
+    NameIdentifier lockIdent = renaming ? schemaIdent : ident;
+    return TreeLockUtils.doWithTreeLock(
+        lockIdent, LockType.WRITE, () -> 
managedOperations.alterSemanticModel(ident, changes));
+  }
+
+  @Override
+  public boolean dropSemanticModel(NameIdentifier ident) {
+    checkRelationalCatalog(ident.namespace());
+    if (!schemaDispatcher.schemaExists(schemaIdentifier(ident))) {
+      return false;
+    }
+    return TreeLockUtils.doWithTreeLock(
+        ident, LockType.WRITE, () -> 
managedOperations.dropSemanticModel(ident));
+  }
+
+  private void checkRelationalCatalog(Namespace namespace) {

Review Comment:
   The `RELATIONAL` restriction is intentional and follows the approved 
Semantic Model design. Semantic Models are managed by Gravitino and 
deliberately do not depend on connector capabilities. 
`AuthorizationUtils.checkCatalogType` is privilege-specific and throws 
`IllegalPrivilegeException`, so it is not suitable for operation support 
validation. I’d keep this explicit check here.



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