[ISSUE #2962] Implement DefaultMQAdminExt::examineTopicConfig function

tools/src/main/java/org/apache/rocketmq/tools/admin/DefaultMQAdminExt.java

@@ -208,7 +208,7 @@ public class DefaultMQAdminExt extends ClientConfig implements MQAdminExt {
     }
 
     @Override
-    public TopicConfig examineTopicConfig(String addr, String topic) {
+    public TopicConfig examineTopicConfig(String addr, String topic) throws RemotingException, InterruptedException, MQBrokerException {
         return defaultMQAdminExtImpl.examineTopicConfig(addr, topic);
     }
 

tools/src/main/java/org/apache/rocketmq/tools/admin/DefaultMQAdminExtImpl.java

@@ -222,8 +222,9 @@ public class DefaultMQAdminExtImpl implements MQAdminExt, MQAdminExtInner {
     }
 
     @Override
-    public TopicConfig examineTopicConfig(String addr, String topic) {
-        return null;
+    public TopicConfig examineTopicConfig(String addr, String topic) throws RemotingException, InterruptedException, MQBrokerException {
+        TopicConfigSerializeWrapper topicConfigSerializeWrapper = this.mqClientInstance.getMQClientAPIImpl().getAllTopicConfig(addr,timeoutMillis);
+        return topicConfigSerializeWrapper.getTopicConfigTable().get(topic);
     }
 
     @Override

tools/src/main/java/org/apache/rocketmq/tools/admin/MQAdminExt.java

@@ -92,7 +92,7 @@ public interface MQAdminExt extends MQAdmin {
 
     SubscriptionGroupConfig examineSubscriptionGroupConfig(final String addr, final String group);
 
-    TopicConfig examineTopicConfig(final String addr, final String topic);
+    TopicConfig examineTopicConfig(final String addr, final String topic) throws RemotingException, InterruptedException, MQBrokerException;
 
     TopicStatsTable examineTopicStats(
         final String topic) throws RemotingException, MQClientException, InterruptedException,

tools/src/test/java/org/apache/rocketmq/tools/admin/DefaultMQAdminExtTest.java

@@ -34,6 +34,7 @@ import org.apache.rocketmq.client.exception.MQClientException;
 import org.apache.rocketmq.client.impl.MQClientAPIImpl;
 import org.apache.rocketmq.client.impl.MQClientManager;
 import org.apache.rocketmq.client.impl.factory.MQClientInstance;
+import org.apache.rocketmq.common.TopicConfig;
 import org.apache.rocketmq.common.admin.ConsumeStats;
 import org.apache.rocketmq.common.admin.OffsetWrapper;
 import org.apache.rocketmq.common.admin.TopicOffset;
@@ -54,6 +55,7 @@ import org.apache.rocketmq.common.protocol.body.ProcessQueueInfo;
 import org.apache.rocketmq.common.protocol.body.ProducerConnection;
 import org.apache.rocketmq.common.protocol.body.QueueTimeSpan;
 import org.apache.rocketmq.common.protocol.body.SubscriptionGroupWrapper;
+import org.apache.rocketmq.common.protocol.body.TopicConfigSerializeWrapper;
 import org.apache.rocketmq.common.protocol.body.TopicList;
 import org.apache.rocketmq.common.protocol.heartbeat.ConsumeType;
 import org.apache.rocketmq.common.protocol.heartbeat.MessageModel;
@@ -225,6 +227,14 @@ public class DefaultMQAdminExtTest {
         consumerRunningInfo.setStatusTable(new TreeMap<String, ConsumeStatus>());
         consumerRunningInfo.setSubscriptionSet(new TreeSet<SubscriptionData>());
         when(mQClientAPIImpl.getConsumerRunningInfo(anyString(), anyString(), anyString(), anyBoolean(), anyLong())).thenReturn(consumerRunningInfo);
+
+        TopicConfigSerializeWrapper topicConfigSerializeWrapper = new TopicConfigSerializeWrapper();
+        topicConfigSerializeWrapper.setTopicConfigTable(new ConcurrentHashMap<String, TopicConfig>() {
+            {
+                put("topic_test_examine_topicConfig", new TopicConfig("topic_test_examine_topicConfig"));
+            }
+        });
+        when(mQClientAPIImpl.getAllTopicConfig(anyString(),anyLong())).thenReturn(topicConfigSerializeWrapper);
     }
 
     @AfterClass
@@ -406,4 +416,10 @@ public class DefaultMQAdminExtTest {
         assertThat(subscriptionGroupWrapper.getSubscriptionGroupTable().get("Consumer-group-one").getGroupName()).isEqualTo("Consumer-group-one");
         assertThat(subscriptionGroupWrapper.getSubscriptionGroupTable().get("Consumer-group-one").isConsumeBroadcastEnable()).isTrue();
     }
+
+    @Test
+    public void testExamineTopicConfig() throws MQBrokerException, RemotingException, InterruptedException {
+        TopicConfig topicConfig = defaultMQAdminExt.examineTopicConfig("127.0.0.1:10911", "topic_test_examine_topicConfig");
+        assertThat(topicConfig.getTopicName().equals("topic_test_examine_topicConfig"));
+    }
 }
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