[GitHub] [kafka] yeralin commented on a change in pull request #6592: KAFKA-8326: Introduce List Serde

[GitBox <gi...@apache.org>]

yeralin commented on a change in pull request #6592:
URL: https://github.com/apache/kafka/pull/6592#discussion_r614950753



##########
File path: clients/src/main/java/org/apache/kafka/common/serialization/ListDeserializer.java
##########
@@ -0,0 +1,196 @@
+/*
+ * 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.kafka.common.serialization;
+
+import org.apache.kafka.clients.CommonClientConfigs;
+import org.apache.kafka.common.KafkaException;
+import org.apache.kafka.common.config.ConfigException;
+import org.apache.kafka.common.errors.SerializationException;
+import org.apache.kafka.common.utils.Utils;
+
+import java.io.ByteArrayInputStream;
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import static org.apache.kafka.common.serialization.Serdes.ListSerde.SerializationStrategy;
+import static org.apache.kafka.common.utils.Utils.mkEntry;
+import static org.apache.kafka.common.utils.Utils.mkMap;
+
+public class ListDeserializer<Inner> implements Deserializer<List<Inner>> {
+
+    private Deserializer<Inner> inner;
+    private Class<?> listClass;
+    private Integer primitiveSize;
+
+    static private Map<Class<? extends Deserializer<?>>, Integer> fixedLengthDeserializers = mkMap(
+        mkEntry(ShortDeserializer.class, 2),
+        mkEntry(IntegerDeserializer.class, 4),
+        mkEntry(FloatDeserializer.class, 4),
+        mkEntry(LongDeserializer.class, 8),
+        mkEntry(DoubleDeserializer.class, 8),

Review comment:
       Hmmm `Double.SIZE` returns 64:
   ```
   jshell> Double.SIZE
   $1 ==> 64
   ```




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