FANNG1 commented on code in PR #5944:
URL: https://github.com/apache/gravitino/pull/5944#discussion_r1895209349


##########
core/src/main/java/org/apache/gravitino/listener/TagEventDispatcher.java:
##########
@@ -19,11 +19,25 @@
 package org.apache.gravitino.listener;
 
 import java.util.Map;
+
 import org.apache.gravitino.MetadataObject;
 import org.apache.gravitino.exceptions.NoSuchTagException;
+import org.apache.gravitino.listener.api.event.AlterTagFailureEvent;
+import 
org.apache.gravitino.listener.api.event.AssociateTagsForMetadataObjectFailureEvent;
+import org.apache.gravitino.listener.api.event.CreateTagFailureEvent;
+import org.apache.gravitino.listener.api.event.DeleteTagFailureEvent;
+import org.apache.gravitino.listener.api.event.GetTagFailureEvent;
+import 
org.apache.gravitino.listener.api.event.GetTagForMetadataObjectFailureEvent;
+import 
org.apache.gravitino.listener.api.event.ListMetadataObjectsForTagFailureEvent;
+import org.apache.gravitino.listener.api.event.ListTagFailureEvent;
+import 
org.apache.gravitino.listener.api.event.ListTagsForMetadataObjectFailureEvent;
+import org.apache.gravitino.listener.api.event.ListTagsInfoFailureEvent;
+import 
org.apache.gravitino.listener.api.event.ListTagsInfoForMetadataObjectFailureEvent;
+import org.apache.gravitino.listener.api.info.MetalakeInfo;
 import org.apache.gravitino.tag.Tag;
 import org.apache.gravitino.tag.TagChange;
 import org.apache.gravitino.tag.TagDispatcher;
+import org.apache.gravitino.utils.PrincipalUtils;
 

Review Comment:
   please remove `@SuppressWarnings("unused")` in TagEventDispatcher
   ```
     @SuppressWarnings("unused")
     private final EventBus eventBus;
   ```



##########
core/src/main/java/org/apache/gravitino/listener/api/event/TagFailureEvent.java:
##########
@@ -0,0 +1,7 @@
+package org.apache.gravitino.listener.api.event;
+
+public class TagFailureEvent extends FailureEvent {
+    public TagFailureEvent(String user, Exception exception) {
+        super(user, null, exception);

Review Comment:
   identifier should not be null for tag event. 



##########
core/src/main/java/org/apache/gravitino/listener/api/event/OperationType.java:
##########
@@ -31,6 +31,20 @@ public enum OperationType {
   REGISTER_TABLE,
   TABLE_EXISTS,
 
+  // Tag operations
+  CREATE_TAG,
+  GET_TAG,
+  GET_TAG_FOR_METADATA_OBJECT,
+  DELETE_TAG,
+  ALTER_TAG,
+  LIST_TAG,
+  TAG_EXISTS,

Review Comment:
   `TAG_EXISTS` not used? please remove it



##########
core/src/main/java/org/apache/gravitino/listener/TagEventDispatcher.java:
##########
@@ -73,21 +87,22 @@ public Tag getTag(String metalake, String name) throws 
NoSuchTagException {
     try {
       // TODO: getTagEvent
       return dispatcher.getTag(metalake, name);
-    } catch (NoSuchTagException e) {
-      // TODO: getTagFailureEvent
+    } catch (Exception e) {
+      eventBus.dispatchEvent(new 
GetTagFailureEvent(PrincipalUtils.getCurrentUserName(), metalake, name, e));
       throw e;
     }
   }
 
   @Override
   public Tag createTag(
       String metalake, String name, String comment, Map<String, String> 
properties) {
+      MetalakeInfo metalakeInfo = new MetalakeInfo(name, comment, properties, 
null);

Review Comment:
   we should create a `TagInfo` not `MetalakeInfo` here



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