cadonna commented on code in PR #15601:
URL: https://github.com/apache/kafka/pull/15601#discussion_r1600006724
##########
streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamKStreamJoin.java:
##########
@@ -43,7 +42,7 @@
import static
org.apache.kafka.streams.StreamsConfig.InternalConfig.EMIT_INTERVAL_MS_KSTREAMS_OUTER_JOIN_SPURIOUS_RESULTS_FIX;
import static
org.apache.kafka.streams.processor.internals.metrics.TaskMetrics.droppedRecordsSensor;
-class KStreamKStreamJoin<K, V1, V2, VOut> implements ProcessorSupplier<K, V1,
K, VOut> {
+abstract class KStreamKStreamJoin<K, VL, VR, VOut, VThis, VOther> implements
ProcessorSupplier<K, VThis, K, VOut> {
Review Comment:
I do not get the difference between `VL` and `VThis` as well as `VR` and
`VOther`. Could you please elaborate?
##########
streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamKStreamLeftJoin.java:
##########
@@ -0,0 +1,72 @@
+/*
+ * 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.streams.kstream.internals;
+
+import org.apache.kafka.streams.kstream.ValueJoinerWithKey;
+import
org.apache.kafka.streams.kstream.internals.KStreamImplJoin.TimeTrackerSupplier;
+import org.apache.kafka.streams.processor.api.Processor;
+import org.apache.kafka.streams.state.internals.LeftOrRightValue;
+import org.apache.kafka.streams.state.internals.TimestampedKeyAndJoinSide;
+
+import java.util.Optional;
+
+class KStreamKStreamLeftJoin<K, VL, VR, VOut> extends KStreamKStreamJoin<K,
VL, VR, VOut, VL, VR> {
Review Comment:
Do you mean that this is the left side of the join or that this is a left
join? That is a bit confusing. Maybe a better name might be
`KStreamKStreamJoinLeftSide`.
##########
streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamKStreamJoin.java:
##########
@@ -43,7 +42,7 @@
import static
org.apache.kafka.streams.StreamsConfig.InternalConfig.EMIT_INTERVAL_MS_KSTREAMS_OUTER_JOIN_SPURIOUS_RESULTS_FIX;
import static
org.apache.kafka.streams.processor.internals.metrics.TaskMetrics.droppedRecordsSensor;
-class KStreamKStreamJoin<K, V1, V2, VOut> implements ProcessorSupplier<K, V1,
K, VOut> {
+abstract class KStreamKStreamJoin<K, VL, VR, VOut, VThis, VOther> implements
ProcessorSupplier<K, VThis, K, VOut> {
Review Comment:
Also a better name for `VL` and `VR` would be `VLeft` and `VRight`,
respectively. `VR` is sometimes used for result value type.
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