zhaijack commented on a change in pull request #1103: PIP-13-1/3: Provide 
`TopicsConsumer` to consume from several topics under same namespace
URL: https://github.com/apache/incubator-pulsar/pull/1103#discussion_r168178825

 File path: 
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+ * 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
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pulsar.client.impl;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkState;
+import com.google.common.collect.Lists;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.concurrent.locks.ReadWriteLock;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+import org.apache.pulsar.client.api.Consumer;
+import org.apache.pulsar.client.api.ConsumerConfiguration;
+import org.apache.pulsar.client.api.Message;
+import org.apache.pulsar.client.api.MessageId;
+import org.apache.pulsar.client.api.PulsarClientException;
+import org.apache.pulsar.client.api.SubscriptionType;
+import org.apache.pulsar.client.util.ConsumerName;
+import org.apache.pulsar.client.util.FutureUtil;
+import org.apache.pulsar.common.api.proto.PulsarApi.CommandAck.AckType;
+import org.apache.pulsar.common.naming.DestinationName;
+import org.apache.pulsar.common.naming.NamespaceName;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+public class TopicsConsumerImpl extends ConsumerBase {
+    // All topics should be in same namespace
+    protected NamespaceName namespaceName;
+    // Map <topic+partition, consumer>, when get do ACK, consumer will by find 
by topic name
+    private final ConcurrentHashMap<String, ConsumerImpl> consumers;
 Review comment:
   Yes, the changes for TopicMessageIdImpl, TopicMessageImpl, and 
UnAckedMessageTracker is aimed to make PartitionedConsumerImpl and 
TopicsConsumerImpl could be easy merged in the future. 

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