vcrfxia commented on code in PR #13830:
URL: https://github.com/apache/kafka/pull/13830#discussion_r1223656443


##########
streams/src/main/java/org/apache/kafka/streams/state/internals/TimeOrderedKeyValueBuffer.java:
##########
@@ -27,14 +26,14 @@
 import java.util.function.Consumer;
 import java.util.function.Supplier;
 
-public interface TimeOrderedKeyValueBuffer<K, V> extends StateStore {
+public interface TimeOrderedKeyValueBuffer<K, V, T> extends StateStore {

Review Comment:
   Can we add a quick javadoc to clarify that `T` here is the buffer type? 
Should already be clear to anyone who reads the code, but a javadoc will help 
make it so readers won't need to read the code if all they want to know is what 
the type is.



##########
streams/src/main/java/org/apache/kafka/streams/state/internals/InMemoryTimeOrderedKeyValueBuffer.java:
##########
@@ -65,7 +65,7 @@
 import static 
org.apache.kafka.streams.state.internals.TimeOrderedKeyValueBufferChangelogDeserializationHelper.deserializeV3;
 import static 
org.apache.kafka.streams.state.internals.TimeOrderedKeyValueBufferChangelogDeserializationHelper.duckTypeV2;
 
-public final class InMemoryTimeOrderedKeyValueBuffer<K, V> implements 
TimeOrderedKeyValueBuffer<K, V> {
+public final class InMemoryTimeOrderedKeyValueBuffer<K, V, T> implements 
TimeOrderedKeyValueBuffer<K, V, Change<V>> {

Review Comment:
   Could be good to rename this to `InMemoryTimeOrderedKeyValueChangeBuffer` to 
contrast with `RocksDBTimeOrderedKeyValueBuffer` (not a change buffer) in your 
next PR, but I don't feel too strongly.



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