[ratis] branch master updated: RATIS-1570. Add getLeaderId method to DivisionInfo (#640)

[szetszwo]

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The following commit(s) were added to refs/heads/master by this push:
     new a0a812d1 RATIS-1570. Add getLeaderId method to DivisionInfo (#640)
a0a812d1 is described below

commit a0a812d11b72fae8201404b298f318bfcecb6ba1
Author: Potato <tanxi...@apache.org>
AuthorDate: Mon May 9 21:02:01 2022 +0800

    RATIS-1570. Add getLeaderId method to DivisionInfo (#640)
---
 .../src/main/java/org/apache/ratis/server/DivisionInfo.java        | 7 +++++++
 .../src/main/java/org/apache/ratis/server/impl/RaftServerImpl.java | 5 +++++
 2 files changed, 12 insertions(+)

diff --git 
a/ratis-server-api/src/main/java/org/apache/ratis/server/DivisionInfo.java 
b/ratis-server-api/src/main/java/org/apache/ratis/server/DivisionInfo.java
index e59cba57..c07317bd 100644
--- a/ratis-server-api/src/main/java/org/apache/ratis/server/DivisionInfo.java
+++ b/ratis-server-api/src/main/java/org/apache/ratis/server/DivisionInfo.java
@@ -20,6 +20,7 @@ package org.apache.ratis.server;
 
 import org.apache.ratis.proto.RaftProtos.RaftPeerRole;
 import org.apache.ratis.proto.RaftProtos.RoleInfoProto;
+import org.apache.ratis.protocol.RaftPeerId;
 import org.apache.ratis.util.LifeCycle;
 
 /**
@@ -51,6 +52,12 @@ public interface DivisionInfo {
   /** Is this server division currently the leader and ready? */
   boolean isLeaderReady();
 
+  /**
+   * @return the id of the current leader if the leader is known to this 
server division;
+   *         otherwise, return null.
+   */
+  RaftPeerId getLeaderId();
+
   /** @return the life cycle state of this server division. */
   LifeCycle.State getLifeCycleState();
 
diff --git 
a/ratis-server/src/main/java/org/apache/ratis/server/impl/RaftServerImpl.java 
b/ratis-server/src/main/java/org/apache/ratis/server/impl/RaftServerImpl.java
index a7b6ac76..f6c45faa 100644
--- 
a/ratis-server/src/main/java/org/apache/ratis/server/impl/RaftServerImpl.java
+++ 
b/ratis-server/src/main/java/org/apache/ratis/server/impl/RaftServerImpl.java
@@ -113,6 +113,11 @@ class RaftServerImpl implements RaftServer.Division,
       return isLeader() && getRole().isLeaderReady();
     }
 
+    @Override
+    public RaftPeerId getLeaderId() {
+      return getState().getLeaderId();
+    }
+
     @Override
     public LifeCycle.State getLifeCycleState() {
       return lifeCycle.getCurrentState();