FANNG1 commented on code in PR #6688:
URL: https://github.com/apache/gravitino/pull/6688#discussion_r1995376299


##########
docs/gravitino-server-config.md:
##########
@@ -118,17 +118,17 @@ Gravitino triggers a pre-event before the operation, a 
post-event after the comp
 
 ##### Post-event
 
-| Operation type                      | Post-event                             
                                                                                
                                                                                
                                                                                
                                                                                
                                                       | Since Version    |
-|-------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------|
-| table operation                     | `CreateTableEvent`, `AlterTableEvent`, 
`DropTableEvent`, `LoadTableEvent`, `ListTableEvent`, `PurgeTableFailureEvent`, 
`CreateTableFailureEvent`, `AlterTableFailureEvent`, `DropTableFailureEvent`, 
`LoadTableFailureEvent`, `ListTableFailureEvent`, `PurgeTableFailureEvent`      
                                                                                
                                                         | 0.5.0            |
-| fileset operation                   | `CreateFileSetEvent`, 
`AlterFileSetEvent`, `DropFileSetEvent`, `LoadFileSetEvent`, 
`ListFileSetEvent`, `CreateFileSetFailureEvent`, `AlterFileSetFailureEvent`, 
`DropFileSetFailureEvent`, `LoadFileSetFailureEvent`, `ListFileSetFailureEvent` 
                                                                                
                                                                                
              | 0.5.0            |
-| topic operation                     | `CreateTopicEvent`, `AlterTopicEvent`, 
`DropTopicEvent`, `LoadTopicEvent`, `ListTopicEvent`, 
`CreateTopicFailureEvent`, `AlterTopicFailureEvent`, `DropTopicFailureEvent`, 
`LoadTopicFailureEvent`, `ListTopicFailureEvent`                                
                                                                                
                                                                                
   | 0.5.0            |
-| schema operation                    | `CreateSchemaEvent`, 
`AlterSchemaEvent`, `DropSchemaEvent`, `LoadSchemaEvent`, `ListSchemaEvent`, 
`CreateSchemaFailureEvent`, `AlterSchemaFailureEvent`, 
`DropSchemaFailureEvent`, `LoadSchemaFailureEvent`, `ListSchemaFailureEvent`    
                                                                                
                                                                                
                     | 0.5.0            |
-| catalog operation                   | `CreateCatalogEvent`, 
`AlterCatalogEvent`, `DropCatalogEvent`, `LoadCatalogEvent`, 
`ListCatalogEvent`, `CreateCatalogFailureEvent`, `AlterCatalogFailureEvent`, 
`DropCatalogFailureEvent`, `LoadCatalogFailureEvent`, `ListCatalogFailureEvent` 
                                                                                
                                                                                
              | 0.5.0            |
-| metalake operation                  | `CreateMetalakeEvent`, 
`AlterMetalakeEvent`, `DropMetalakeEvent`, `LoadMetalakeEvent`, 
`ListMetalakeEvent`, `CreateMetalakeFailureEvent`, `AlterMetalakeFailureEvent`, 
`DropMetalakeFailureEvent`, `LoadMetalakeFailureEvent`, 
`ListMetalakeFailureEvent`                                                      
                                                                                
                               | 0.5.0            |
-| Iceberg REST server table operation | `IcebergCreateTableEvent`, 
`IcebergUpdateTableEvent`, `IcebergDropTableEvent`, `IcebergLoadTableEvent`, 
`IcebergListTableEvent`, `IcebergTableExistsEvent`, `IcebergRenameTableEvent`, 
`IcebergCreateTableFailureEvent`, `IcebergUpdateTableFailureEvent`, 
`IcebergDropTableFailureEvent`, `IcebergLoadTableFailureEvent`, 
`IcebergListTableFailureEvent`, `IcebergRenameTableFailureEvent`, 
`IcebergTableExistsFailureEvent` | 0.7.0-incubating |
-| tag operation                       | `ListTagsEvent`, `ListTagsInfoEvent`, 
`CreateTagEvent`, `GetTagEvent`, `AlterTagEvent`, `DeleteTagEvent`, 
`ListMetadataObjectsForTagEvent`, `ListTagsForMetadataObjectEvent`, 
`ListTagsInfoForMetadataObjectEvent`, `AssociateTagsForMetadataObjectEvent`, 
`GetTagForMetadataObjectEvent`, `ListTagsFailureEvent`, 
`ListTagInfoFailureEvent`, `CreateTagFailureEvent`, `GetTagFailureEvent`, 
`AlterTagFailureEvent`, `DeleteTagFailureEvent`, 
`ListMetadataObjectsForTagFailureEvent`, 
`ListTagsForMetadataObjectFailureEvent`, 
`ListTagsInfoForMetadataObjectFailureEvent`, 
`AssociateTagsForMetadataObjectFailureEvent`, 
`GetTagForMetadataObjectFailureEvent`                                           
                                                                                
    | 0.9.0-incubating |
-| model operation                     | `DeleteModelFailureEvent`, 
`DeleteModelVersionFailureEvent`, `GetModelFailureEvent`, 
`GetModelVersionFailureEvent`, `LinkModelVersionFailureEvent`, 
`ListModelFailureEvent`, `ListModelVersionFailureEvent`, 
`RegisterAndLinkModelFailureEvent`, `RegisterModelFailureEvent`                 
                                                                                
                                                                                
                                                                                
                                                                                
                                    | 0.9.0-incubating |
+| Operation type                      | Post-event                             
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                          | Since Version    |
+|-------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------|
+| table operation                     | `CreateTableEvent`, `AlterTableEvent`, 
`DropTableEvent`, `LoadTableEvent`, `ListTableEvent`, `PurgeTableFailureEvent`, 
`CreateTableFailureEvent`, `AlterTableFailureEvent`, `DropTableFailureEvent`, 
`LoadTableFailureEvent`, `ListTableFailureEvent`, `PurgeTableFailureEvent`      
                                                                                
                                                                                
                                                                                
                                                                                
                                            | 0.5.0            |
+| fileset operation                   | `CreateFileSetEvent`, 
`AlterFileSetEvent`, `DropFileSetEvent`, `LoadFileSetEvent`, 
`ListFileSetEvent`, `CreateFileSetFailureEvent`, `AlterFileSetFailureEvent`, 
`DropFileSetFailureEvent`, `LoadFileSetFailureEvent`, `ListFileSetFailureEvent` 
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
 | 0.5.0            |
+| topic operation                     | `CreateTopicEvent`, `AlterTopicEvent`, 
`DropTopicEvent`, `LoadTopicEvent`, `ListTopicEvent`, 
`CreateTopicFailureEvent`, `AlterTopicFailureEvent`, `DropTopicFailureEvent`, 
`LoadTopicFailureEvent`, `ListTopicFailureEvent`                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                      | 0.5.0   
         |
+| schema operation                    | `CreateSchemaEvent`, 
`AlterSchemaEvent`, `DropSchemaEvent`, `LoadSchemaEvent`, `ListSchemaEvent`, 
`CreateSchemaFailureEvent`, `AlterSchemaFailureEvent`, 
`DropSchemaFailureEvent`, `LoadSchemaFailureEvent`, `ListSchemaFailureEvent`    
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
        | 0.5.0            |
+| catalog operation                   | `CreateCatalogEvent`, 
`AlterCatalogEvent`, `DropCatalogEvent`, `LoadCatalogEvent`, 
`ListCatalogEvent`, `CreateCatalogFailureEvent`, `AlterCatalogFailureEvent`, 
`DropCatalogFailureEvent`, `LoadCatalogFailureEvent`, `ListCatalogFailureEvent` 
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
 | 0.5.0            |
+| metalake operation                  | `CreateMetalakeEvent`, 
`AlterMetalakeEvent`, `DropMetalakeEvent`, `LoadMetalakeEvent`, 
`ListMetalakeEvent`, `CreateMetalakeFailureEvent`, `AlterMetalakeFailureEvent`, 
`DropMetalakeFailureEvent`, `LoadMetalakeFailureEvent`, 
`ListMetalakeFailureEvent`                                                      
                                                                                
                                                                                
                                                                                
                                                                                
                  | 0.5.0            |
+| Iceberg REST server table operation | `IcebergCreateTableEvent`, 
`IcebergUpdateTableEvent`, `IcebergDropTableEvent`, `IcebergLoadTableEvent`, 
`IcebergListTableEvent`, `IcebergTableExistsEvent`, `IcebergRenameTableEvent`, 
`IcebergCreateTableFailureEvent`, `IcebergUpdateTableFailureEvent`, 
`IcebergDropTableFailureEvent`, `IcebergLoadTableFailureEvent`, 
`IcebergListTableFailureEvent`, `IcebergRenameTableFailureEvent`, 
`IcebergTableExistsFailureEvent`                                                
                                                                                
                                                                                
                    | 0.7.0-incubating |
+| tag operation                       | `ListTagsEvent`, `ListTagsInfoEvent`, 
`CreateTagEvent`, `GetTagEvent`, `AlterTagEvent`, `DeleteTagEvent`, 
`ListMetadataObjectsForTagEvent`, `ListTagsForMetadataObjectEvent`, 
`ListTagsInfoForMetadataObjectEvent`, `AssociateTagsForMetadataObjectEvent`, 
`GetTagForMetadataObjectEvent`, `ListTagsFailureEvent`, 
`ListTagInfoFailureEvent`, `CreateTagFailureEvent`, `GetTagFailureEvent`, 
`AlterTagFailureEvent`, `DeleteTagFailureEvent`, 
`ListMetadataObjectsForTagFailureEvent`, 
`ListTagsForMetadataObjectFailureEvent`, 
`ListTagsInfoForMetadataObjectFailureEvent`, 
`AssociateTagsForMetadataObjectFailureEvent`, 
`GetTagForMetadataObjectFailureEvent` | 0.9.0-incubating |
+| model operation                     | `DeleteModelEvent`,  
`DeleteModelVersionEvent`,  <br/>`GetModelEvent`, `GetModelVersionEvent`, 
`LinkModelVersionEvent`, `ListModelEvent`, `ListModelVersionsEvent`,  
`RegisterAndLinkModelEvent`, `RegisterModelEvent`,  `DeleteModelFailureEvent`, 
`DeleteModelVersionFailureEvent`, `GetModelFailureEvent`, 
`GetModelVersionFailureEvent`, `LinkModelVersionFailureEvent`, 
`ListModelFailureEvent`, `ListModelVersionFailureEvent`, 
`RegisterAndLinkModelFailureEvent`, `RegisterModelFailureEvent`                 
                                                                                
                                                           | 0.9.0-incubating |

Review Comment:
   why add `<br/>` here?



##########
core/src/main/java/org/apache/gravitino/listener/ModelEventDispatcher.java:
##########
@@ -106,14 +117,17 @@ public Model registerModel(
     ModelVersionInfo linkModelVersionRequest =
         new ModelVersionInfo(uri, comment, properties, aliases);
     String user = PrincipalUtils.getCurrentUserName();
-
     RegisterAndLinkModelPreEvent registerAndLinkModelPreEvent =
         new RegisterAndLinkModelPreEvent(
             user, ident, registerModelRequest, linkModelVersionRequest);
+
     eventBus.dispatchEvent(registerAndLinkModelPreEvent);
     try {
-      // TODO: ModelEvent
-      return dispatcher.registerModel(ident, uri, aliases, comment, 
properties);
+      Model registeredModel = dispatcher.registerModel(ident, uri, aliases, 
comment, properties);
+      ModelInfo registeredModelInfo = new ModelInfo(registeredModel);
+      eventBus.dispatchEvent(
+          new RegisterAndLinkModelEvent(user, ident, registeredModelInfo, 
linkModelVersionRequest));

Review Comment:
   How about replace `linkModelVersionRequest` with `uri`?



##########
core/src/main/java/org/apache/gravitino/listener/api/event/DeleteModelEvent.java:
##########
@@ -0,0 +1,73 @@
+/*
+ * 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.listener.api.event;
+
+import org.apache.gravitino.NameIdentifier;
+import org.apache.gravitino.annotation.DeveloperApi;
+
+/** Represents an event that is generated after a model is successfully 
deleted. */
+@DeveloperApi
+public class DeleteModelEvent extends ModelEvent {
+  private final boolean isExists;
+
+  /**
+   * Constructs a new instance of {@code DeleteModelEvent}, capturing 
essential details about the
+   * successful drop of a model.
+   *
+   * @param user The username of the individual who initiated the model drop 
operation.
+   * @param identifier The unique identifier of the model that was dropped.
+   * @param isExists A boolean flag indicating whether the model existed at 
the time of the drop
+   *     operation.
+   */
+  public DeleteModelEvent(String user, NameIdentifier identifier, boolean 
isExists) {
+    super(user, identifier);
+    this.isExists = isExists;
+  }
+
+  /**
+   * Retrieves the existence status of the model at the time of the drop 
operation.
+   *
+   * @return A boolean value indicating whether the model existed. {@code 
true} if the model
+   *     existed, otherwise {@code false}.
+   */
+  public boolean isExists() {
+    return isExists;
+  }
+
+  /**
+   * Returns the type of operation.
+   *
+   * @return The operation type.
+   */
+  @Override
+  public OperationType operationType() {
+    return OperationType.DELETE_MODEL;
+  }
+
+  /**
+   * The status of the operation.
+   *
+   * @return The operation status.
+   */
+  @Override
+  public OperationStatus operationStatus() {
+    return isExists() ? OperationStatus.SUCCESS : OperationStatus.UNPROCESSED;

Review Comment:
   UNPROCESSED is used for pre event 



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