merlimat commented on a change in pull request #1156: Introduce 
ActiveConsumerListener for realizing if a consumer is active in a failover 
subscription group
URL: https://github.com/apache/incubator-pulsar/pull/1156#discussion_r168085822
 
 

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 File path: 
pulsar-client/src/main/java/org/apache/pulsar/client/api/ActiveConsumerListener.java
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 @@ -0,0 +1,36 @@
+/*
+ * 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.pulsar.client.api;
+
+/**
+ * Listener on the consumer state changes.
+ */
+public interface ActiveConsumerListener {
 
 Review comment:
   Sure, that makes sense. 
   
   One other thing that I was thinking is that we could have this listener to 
be more general oriented, so that we could in future reuse it for other kinds 
of notifications. 
   
   Something like `ConsumerEventsListener` so that is more neutral? What do you 
think?

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