= code cleanup

server/src/main/java/com/alibaba/otter/canal/server/embedded/CanalServerWithEmbedded.java

@@ -2,7 +2,6 @@ package com.alibaba.otter.canal.server.embedded;
 
 import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -566,8 +565,12 @@ public class CanalServerWithEmbedded extends AbstractCanalLifeCycle implements C
         for (CanalMetricsProvider provider : providers) {
             list.add(provider);
         }
-        if (!list.isEmpty()) {
-            // 发现provider, 进行初始化
+
+        if (list.isEmpty()) {
+            return;
+        }
+
+        // only allow ONE provider
         if (list.size() > 1) {
             logger.warn("Found more than one CanalMetricsProvider, use the first one.");
             // 报告冲突
@@ -575,11 +578,10 @@ public class CanalServerWithEmbedded extends AbstractCanalLifeCycle implements C
                 logger.warn("Found CanalMetricsProvider: {}.", p.getClass().getName());
             }
         }
-            // 默认使用第一个
+
         CanalMetricsProvider provider = list.get(0);
         this.metrics = provider.getService();
     }
-    }
 
     private boolean isRaw(CanalEventStore eventStore) {
         if (eventStore instanceof MemoryEventStoreWithBuffer) {