kezhuw commented on a change in pull request #10165:
URL: https://github.com/apache/pulsar/pull/10165#discussion_r611203636



##########
File path: 
pulsar-broker/src/test/java/org/apache/pulsar/broker/service/TopicOwnerTest.java
##########
@@ -240,6 +245,28 @@ private void 
spyZookeeperToDisconnectAfterPersist(ZooKeeper zooKeeper, RequestMa
         }).when(spyZooKeeperServer).submitRequest(any(Request.class));
     }
 
+    private MutableBoolean listenNamespaceBundleLoading(PulsarService broker, 
NamespaceBundle namespaceBundle) {
+        NamespaceService namespaceService = broker.getNamespaceService();
+        final MutableBoolean loaded = new MutableBoolean();
+        namespaceService.addNamespaceBundleOwnershipListener(new 
NamespaceBundleOwnershipListener() {

Review comment:
       I am not sure I understand your concern correctly. I try to answer with 
following. Correct me if mistake happens.
   
   * The returned `MutableBoolean` is one per listening. It is used in 
assertion after all procedures done. So if assertion fails, it is a bug either 
production or test scope.
   * Every listening is serving for one bundle(eg. `namespaceBundle` in 
parameter list). Multiple listening return different `MutableBoolean` for 
combination of `broker` and `namespaceBundle`. There is no sharing.
   
   > If call listenNamespaceBundleLoading multiple times, it will register 
multiple listeners to the namespace service, is this an expected behavior for 
your test?
   
   There is no multiple listening for same combination of `broker` and 
`namespaceBundle` in test code.




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