preferred as leader.

src/main/java/com/xuxd/kafka/console/beans/dto/ReplicationDTO.java

@@ -0,0 +1,17 @@
+package com.xuxd.kafka.console.beans.dto;
+
+import lombok.Data;
+
+/**
+ * kafka-console-ui.
+ *
+ * @author xuxd
+ * @date 2021-11-10 20:09:20
+ **/
+@Data
+public class ReplicationDTO {
+
+    private String topic;
+
+    private int partition;
+}

src/main/java/com/xuxd/kafka/console/controller/OperationController.java

@@ -1,5 +1,6 @@
 package com.xuxd.kafka.console.controller;
 
+import com.xuxd.kafka.console.beans.dto.ReplicationDTO;
 import com.xuxd.kafka.console.beans.dto.SyncDataDTO;
 import com.xuxd.kafka.console.service.OperationService;
 import org.apache.kafka.clients.admin.AdminClientConfig;
@@ -46,4 +47,9 @@ public class OperationController {
     public Object deleteAlignment(@RequestParam Long id) {
         return operationService.deleteAlignmentById(id);
     }
+
+    @PostMapping("/replication/preferred")
+    public Object electPreferredLeader(@RequestBody ReplicationDTO dto) {
+        return operationService.electPreferredLeader(dto.getTopic(), dto.getPartition());
+    }
 }

src/main/java/com/xuxd/kafka/console/service/OperationService.java

@@ -18,4 +18,6 @@ public interface OperationService {
     ResponseData getAlignmentList();
 
     ResponseData deleteAlignmentById(Long id);
+
+    ResponseData electPreferredLeader(String topic, int partition);
 }

src/main/java/com/xuxd/kafka/console/service/impl/OperationServiceImpl.java

@@ -9,9 +9,11 @@ import com.xuxd.kafka.console.beans.vo.OffsetAlignmentVO;
 import com.xuxd.kafka.console.dao.MinOffsetAlignmentMapper;
 import com.xuxd.kafka.console.service.OperationService;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
+import java.util.Set;
 import kafka.console.OperationConsole;
 import org.apache.kafka.common.TopicPartition;
 import org.springframework.beans.factory.ObjectProvider;
@@ -107,4 +109,17 @@ public class OperationServiceImpl implements OperationService {
         minOffsetAlignmentMapper.deleteById(id);
         return ResponseData.create().success();
     }
+
+    @Override public ResponseData electPreferredLeader(String topic, int partition) {
+        Set<TopicPartition> partitions = new HashSet<>();
+        if (partition != -1) {
+            partitions.add(new TopicPartition(topic, partition));
+        } else {
+
+            partitions.addAll(operationConsole.getTopicPartitions(topic));
+        }
+        Tuple2<Object, String> tuple2 = operationConsole.electPreferredLeader(partitions);
+
+        return (boolean) tuple2._1() ? ResponseData.create().success() : ResponseData.create().failed(tuple2._2());
+    }
 }