szetszwo commented on PR #1589:
URL: https://github.com/apache/ratis/pull/1589#issuecomment-5727953177

   @ivandika3 , @amaliujia , thanks for working on this!  Sorry for checking 
this late.  I do have some comments on the new public APIs
   
   - I suggest to make the new method more general by adding an enum.
   - Then, we could also clean up the code in RaftServerImpl; see 
https://issues.apache.org/jira/secure/attachment/13084585/1589_review.patch
   ```java
   //RaftServer.Division
       /** @return the current leadership status of this division. */
       LeadershipStatus getLeadershipStatus();
   
       /**
        * Convert the given leadership status (not necessarily the current 
status) to an exception.
        *
        * @return For {@link LeadershipStatus#LEADER_READY}, return null.
        *         Otherwise, return an exception corresponding to {@link 
LeadershipStatus#getExceptionClass()}.
        */
       RaftException newLeadershipException(LeadershipStatus leadershipStatus);
   ```
   ```java
   //RaftServer
     enum LeadershipStatus {
       /** The division is a leader and it is ready. */
       LEADER_READY(null),
       /** The division is a leader, but it is NOT ready. */
       LEADER_NOT_READY(LeaderNotReadyException.class),
       /** The division is a leader, but it is stepping down. */
       LEADER_STEPPING_DOWN(LeaderSteppingDownException.class),
       /** The division is NOT a leader; */
       NOT_LEADER(NotLeaderException.class);
   
       private final Class<? extends RaftException> exceptionClass;
   
       LeadershipStatus(Class<? extends RaftException> exceptionClass) {
         this.exceptionClass = exceptionClass;
       }
   
       /**
        *  @return For {@link #LEADER_READY}, return null.
        *          Otherwise, return the corresponding exception class.
        */
       public Class<? extends RaftException> getExceptionClass() {
         return exceptionClass;
       }
     }
   ```


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