pnowojski commented on a change in pull request #9646:  [FLINK-14004][runtime] 
Define SourceReaderOperator to verify the integration with 

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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
+ *
+ *
+ *
+ * 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.flink.streaming.api.operators;
+import org.apache.flink.annotation.PublicEvolving;
+ * Base source operator only used for integrating the source reader which is 
proposed by FLIP-27. It implements
+ * the interface of {@link PushingAsyncDataInput} for naturally compatible 
with one input processing in runtime
+ * stack.
+ *
+ * @param <OUT> The output type of the operator
+ */
+public abstract class SourceReaderOperator<OUT> extends 
AbstractStreamOperator<OUT> implements PushingAsyncDataInput<OUT> {
 Review comment:
   nit: maybe add a note, that we are expecting this to be changed to the 
concrete class once `SourceReader` interface is introduced?

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