sijie commented on a change in pull request #1094: BP-27: New BookKeeper CLI 
URL: https://github.com/apache/bookkeeper/pull/1094#discussion_r168261389
 
 

 ##########
 File path: 
bookkeeper-server/src/main/java/org/apache/bookkeeper/tools/cli/helpers/DiscoveryCommand.java
 ##########
 @@ -0,0 +1,59 @@
+/*
+ * 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.bookkeeper.tools.cli.helpers;
+
+import java.util.Optional;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import lombok.Cleanup;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.bookkeeper.client.api.BookKeeper;
+import org.apache.bookkeeper.conf.ClientConfiguration;
+import org.apache.bookkeeper.discover.RegistrationClient;
+import org.apache.bookkeeper.stats.NullStatsLogger;
+import org.apache.bookkeeper.util.ReflectionUtils;
+
+/**
+ * This is a mixin for commands that talks to discovery service.
+ */
+@Slf4j
+public abstract class DiscoveryCommand extends ClientCommand {
+
+    @Override
+    protected void run(ClientConfiguration conf) throws Exception {
+        Class<? extends RegistrationClient> regClientCls = 
conf.getRegistrationClientClass();
+        @Cleanup("shutdown") ScheduledExecutorService executor = 
Executors.newSingleThreadScheduledExecutor();
+        try (RegistrationClient regClient = 
ReflectionUtils.newInstance(regClientCls)) {
+            regClient.initialize(
+                conf,
+                executor,
+                NullStatsLogger.INSTANCE,
+                Optional.empty());
+            run(regClient);
+        }
+    }
+
+    @Override
+    protected void run(BookKeeper bk) throws Exception {
+        throw new UnsupportedOperationException("Discovery command only uses 
registration client");
 
 Review comment:
   done. let `DiscoveryCommand` inherits `Command` directly, instead of 
`ClientCommand`.

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