stevenzwu commented on a change in pull request #15924:
URL: https://github.com/apache/flink/pull/15924#discussion_r641726629



##########
File path: 
flink-connectors/flink-connector-base/src/main/java/org/apache/flink/connector/base/source/hybrid/HybridSourceReader.java
##########
@@ -0,0 +1,214 @@
+/*
+ * 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.flink.connector.base.source.hybrid;
+
+import org.apache.flink.api.connector.source.ReaderOutput;
+import org.apache.flink.api.connector.source.SourceEvent;
+import org.apache.flink.api.connector.source.SourceReader;
+import org.apache.flink.api.connector.source.SourceReaderContext;
+import org.apache.flink.api.connector.source.SourceSplit;
+import org.apache.flink.core.io.InputStatus;
+import org.apache.flink.util.Preconditions;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * Hybrid source reader that delegates to the actual source reader.
+ *
+ * <p>This reader is setup with a sequence of underlying source readers. At a 
given point in time,
+ * one of these readers is active. Underlying readers are opened and closed on 
demand as determined
+ * by the enumerator, which selects the active reader via {@link 
SwitchSourceEvent}.
+ *
+ * <p>When the underlying reader has consumed all input, {@link 
HybridSourceReader} sends {@link
+ * SourceReaderFinishedEvent} to the coordinator and waits for the {@link 
SwitchSourceEvent}.
+ */
+public class HybridSourceReader<T> implements SourceReader<T, 
HybridSourceSplit<?>> {
+    private static final Logger LOG = 
LoggerFactory.getLogger(HybridSourceReader.class);
+    private SourceReaderContext readerContext;

Review comment:
       first two should be final




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