hachikuji commented on code in PR #12663:
URL: https://github.com/apache/kafka/pull/12663#discussion_r984957644


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractPrototypeAsyncConsumer.java:
##########
@@ -0,0 +1,124 @@
+/*
+ * 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.clients.consumer.internals;
+
+import org.apache.kafka.clients.consumer.Consumer;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.internals.events.ApplicationEvent;
+import org.apache.kafka.clients.consumer.internals.events.BackgroundEvent;
+import org.apache.kafka.clients.consumer.internals.events.EventHandler;
+import org.apache.kafka.common.utils.Time;
+
+import java.time.Duration;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+/**
+ * This is the prototype of the consumer that uses the {@link EventHandler} to 
process application events.

Review Comment:
   I think the main thing this doc should mention is that all network IO will 
be done in a background thread instead of being partially driven by the 
application calling `poll()`. Also, perhaps it would be helpful to link to the 
wiki so that people can understand a little better?



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