yuz10 commented on a change in pull request #744:
URL: https://github.com/apache/rocketmq-externals/pull/744#discussion_r663995671



##########
File path: 
rocketmq-console/src/main/java/org/apache/rocketmq/console/service/impl/MessageTraceServiceImpl.java
##########
@@ -51,4 +83,94 @@
             throw Throwables.propagate(err);
         }
     }
+
+    @Override
+    public MessageTraceGraph queryMessageTraceGraph(String key) {
+        List<MessageTraceView> messageTraceViews = queryMessageTraceKey(key);
+        return buildMessageTraceGraph(messageTraceViews);
+    }
+
+    private MessageTraceGraph buildMessageTraceGraph(List<MessageTraceView> 
messageTraceViews) {
+        MessageTraceGraph messageTraceGraph = new MessageTraceGraph();
+        messageTraceGraph.setMessageTraceViews(messageTraceViews);
+        if (CollectionUtils.isEmpty(messageTraceViews)) {
+            return messageTraceGraph;
+        }
+        ProducerNode producerNode = null;
+        Map<String, Map<String, Pair<MessageTraceView, MessageTraceView>>> 
messageTraceViewGroupMap = Maps.newHashMap();
+        for (MessageTraceView messageTraceView : messageTraceViews) {
+            switch (TraceType.valueOf(messageTraceView.getMsgType())) {
+                case Pub:
+                    producerNode = buildMessageRoot(messageTraceView);
+                    break;
+                case SubBefore:
+                case SubAfter:
+                    putIntoMessageTraceViewGroupMap(messageTraceView, 
messageTraceViewGroupMap);
+                    break;
+                default:
+                    break;
+            }
+        }
+        messageTraceGraph.setProducerNode(producerNode);
+        
messageTraceGraph.setSubscriptionNodeList(buildSubscriptionNodeList(messageTraceViewGroupMap));
+        return messageTraceGraph;
+    }
+
+    private List<SubscriptionNode> buildSubscriptionNodeList(
+        Map<String, Map<String, Pair<MessageTraceView, MessageTraceView>>> 
messageTraceViewGroupMap) {
+        List<SubscriptionNode> subscriptionNodeList = new 
ArrayList<>(messageTraceViewGroupMap.size());
+        for (Map.Entry<String, Map<String, Pair<MessageTraceView, 
MessageTraceView>>> groupTraceView : messageTraceViewGroupMap
+            .entrySet()) {
+            SubscriptionNode subscriptionNode = new SubscriptionNode();
+            subscriptionNode.setSubscriptionGroup(groupTraceView.getKey());
+            List<TraceNode> consumeNodeList = Lists.newArrayList();
+            subscriptionNode.setConsumeNodeList(consumeNodeList);
+            subscriptionNodeList.add(subscriptionNode);
+            for (Map.Entry<String, Pair<MessageTraceView, MessageTraceView>> 
requestIdTracePair : groupTraceView
+                .getValue().entrySet()) {
+                MessageTraceView subBeforeTrace = 
requestIdTracePair.getValue().getObject1();
+                MessageTraceView subAfterTrace = 
requestIdTracePair.getValue().getObject2();
+                TraceNode consumeNode = new TraceNode();
+                consumeNode.setRequestId(requestIdTracePair.getKey());
+                consumeNode.setStoreHost(subBeforeTrace.getStoreHost());
+                consumeNode.setClientHost(subBeforeTrace.getClientHost());
+                consumeNode.setRetryTimes(subBeforeTrace.getRetryTimes());
+                consumeNode.setBeginTimeStamp(subBeforeTrace.getTimeStamp());
+                consumeNode.setCostTime(subAfterTrace.getCostTime());
+                consumeNode.setEndTimeStamp(subAfterTrace.getTimeStamp());
+                consumeNode.setStatus(subAfterTrace.getStatus());
+                consumeNodeList.add(consumeNode);
+            }
+        }
+        return subscriptionNodeList;
+    }
+
+    private void putIntoMessageTraceViewGroupMap(MessageTraceView 
messageTraceView,
+        Map<String, Map<String, Pair<MessageTraceView, MessageTraceView>>> 
messageTraceViewGroupMap) {
+        Map<String, Pair<MessageTraceView, MessageTraceView>> 
requestIdTraceMap = messageTraceViewGroupMap
+            .computeIfAbsent(messageTraceView.getGroupName(), (o) -> new 
HashMap<>(2));

Review comment:
       the newest commit of rocketmq has removed groupname field of SubAfter 
trace, so you will not be able to match the pair in later releases.   see  
https://github.com/apache/rocketmq/pull/3005/files
   
   this will result null exception at: 
org.apache.rocketmq.console.service.impl.MessageTraceServiceImpl.buildSubscriptionNodeList(MessageTraceServiceImpl.java:135)

##########
File path: 
rocketmq-console/src/test/java/org/apache/rocketmq/console/service/impl/MessageTraceServiceImplTest.java
##########
@@ -0,0 +1,138 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package org.apache.rocketmq.console.service.impl;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import lombok.SneakyThrows;
+import org.apache.rocketmq.client.QueryResult;
+import org.apache.rocketmq.common.message.MessageExt;
+import org.apache.rocketmq.console.config.RMQConfigure;
+import org.apache.rocketmq.console.model.MessageTraceView;
+import org.apache.rocketmq.console.model.trace.MessageTraceGraph;
+import org.apache.rocketmq.console.util.JsonUtil;
+import org.apache.rocketmq.tools.admin.MQAdminExt;
+import org.assertj.core.util.Lists;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.MockitoAnnotations;
+import org.mockito.junit.MockitoJUnitRunner;
+
+@RunWith(MockitoJUnitRunner.class)

Review comment:
       run this test fails in my computer, MockitoJUnitRunner init fail, it.s 
fine if remove @RunWith(MockitoJUnitRunner.class)
   
![image](https://user-images.githubusercontent.com/14816818/124523784-17d92980-de2b-11eb-98bb-b27a01bb4bd3.png)
   

##########
File path: 
rocketmq-console/src/main/java/org/apache/rocketmq/console/service/impl/MessageTraceServiceImpl.java
##########
@@ -51,4 +83,94 @@
             throw Throwables.propagate(err);
         }
     }
+
+    @Override
+    public MessageTraceGraph queryMessageTraceGraph(String key) {
+        List<MessageTraceView> messageTraceViews = queryMessageTraceKey(key);
+        return buildMessageTraceGraph(messageTraceViews);
+    }
+
+    private MessageTraceGraph buildMessageTraceGraph(List<MessageTraceView> 
messageTraceViews) {
+        MessageTraceGraph messageTraceGraph = new MessageTraceGraph();
+        messageTraceGraph.setMessageTraceViews(messageTraceViews);
+        if (CollectionUtils.isEmpty(messageTraceViews)) {
+            return messageTraceGraph;
+        }
+        ProducerNode producerNode = null;
+        Map<String, Map<String, Pair<MessageTraceView, MessageTraceView>>> 
messageTraceViewGroupMap = Maps.newHashMap();

Review comment:
       complicated definition could be defined as class




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