yuz10 commented on a change in pull request #744:
URL: https://github.com/apache/rocketmq-externals/pull/744#discussion_r664154949



##########
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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