[GitHub] [flink] StefanRRichter commented on a change in pull request #8476: [FLINK-12490][network] Introduce Input and NetworkInput interfaces

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StefanRRichter commented on a change in pull request #8476: [FLINK-12490][network] Introduce Input and NetworkInput interfaces
URL: https://github.com/apache/flink/pull/8476#discussion_r285527065
 
 

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 File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/io/NetworkInput.java
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 @@ -0,0 +1,154 @@
+/*
+ * 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.streaming.runtime.io;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.runtime.event.AbstractEvent;
+import org.apache.flink.runtime.io.disk.iomanager.IOManager;
+import org.apache.flink.runtime.io.network.api.EndOfPartitionEvent;
+import org.apache.flink.runtime.io.network.api.serialization.RecordDeserializer;
+import org.apache.flink.runtime.io.network.api.serialization.RecordDeserializer.DeserializationResult;
+import org.apache.flink.runtime.io.network.api.serialization.SpillingAdaptiveSpanningRecordDeserializer;
+import org.apache.flink.runtime.io.network.buffer.Buffer;
+import org.apache.flink.runtime.io.network.partition.consumer.BufferOrEvent;
+import org.apache.flink.runtime.io.network.partition.consumer.InputGate;
+import org.apache.flink.runtime.plugable.DeserializationDelegate;
+import org.apache.flink.runtime.plugable.NonReusingDeserializationDelegate;
+import org.apache.flink.streaming.runtime.streamrecord.StreamElement;
+import org.apache.flink.streaming.runtime.streamrecord.StreamElementSerializer;
+
+import java.io.IOException;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * Implementation of taking {@link InputGate} as {@link Input}.
+ */
+@Internal
+public final class NetworkInput implements Input {
+
+	private final int numberOfInputChannels;
+
+	private final CheckpointBarrierHandler barrierHandler;
+
+	private final DeserializationDelegate<StreamElement> deserializationDelegate;
+
+	private final RecordDeserializer<DeserializationDelegate<StreamElement>>[] recordDeserializers;
+
+	/**
+	 * The channel from which a buffer came, tracked so that we can appropriately map
+	 * the watermarks and watermark statuses to the correct channel index of the correct valve.
+	 */
+	private int currentChannel = -1;
 
 Review comment:
   Also would use a `static final int UNSPECIFIED = -1;`

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