intermediate changes

provider/register-azure/src/main/java/org/opengroup/osdu/register/provider/azure/subscriber/TopicsRepositoryImpl.java

@@ -53,9 +53,11 @@ public class TopicsRepositoryImpl implements ITopicsRepository {
     }
 
     public String getTopicAliasFromFullyQualifiedTopicName(String fullyQualifiedTopicName) {
-        List<Topic> topicList = listMessages();
-        for (Topic topicIterator: topicList) {
-            fullyQualifiedNameToAliasMap.put(partitionHelper.getFullyQualifiedTopicName(topicIterator.getName()), topicIterator.getName());
+        if( fullyQualifiedNameToAliasMap == null) {
+            List<Topic> topicList = listMessages();
+            for (Topic topicIterator : topicList) {
+                fullyQualifiedNameToAliasMap.put(partitionHelper.getFullyQualifiedTopicName(topicIterator.getName()), topicIterator.getName());
+            }
         }
         return fullyQualifiedNameToAliasMap.get(fullyQualifiedTopicName);
     }