raminqaf commented on code in PR #15601:
URL: https://github.com/apache/kafka/pull/15601#discussion_r1600077088
##########
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:
We needed a way to detect the type of the side being called dynamically. So
that the super class can handle them based on the caller. It also ensures the
type safety.
When this class is called by the _left side_ of the join `VThis` would be
_left_ left type (`VLeft`) and `VOther` would be _right_ type (`VRight`).
```java
class KStreamKStreamLeftJoinSide<K, VLeft, VRight, VOut> extends
KStreamKStreamJoin<K, VLeft, VRight, VOut, VLeft, VRight> {
--^-- --^---
VThis VOther
```
Whereas for the _right side_ of the join `VThis` would be _right_ left type
(`VRight`) and `VOther` would be _left_ type (`VLeft`).
```java
class KStreamKStreamRightJoinSide<K, VLeft, VRight, VOut> extends
KStreamKStreamJoin<K, VLeft, VRight, VOut, VRight, VLeft>
--^-- --^---
VThis VOther
```
##########
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:
We needed a way to detect the type of the side being called dynamically so
that the super class can handle them based on the caller. This also ensures
type safety.
When this class is called by the _left side_ of the join `VThis` would be
_left_ left type (`VLeft`) and `VOther` would be _right_ type (`VRight`).
```java
class KStreamKStreamLeftJoinSide<K, VLeft, VRight, VOut> extends
KStreamKStreamJoin<K, VLeft, VRight, VOut, VLeft, VRight> {
--^-- --^---
VThis VOther
```
Whereas for the _right side_ of the join `VThis` would be _right_ left type
(`VRight`) and `VOther` would be _left_ type (`VLeft`).
```java
class KStreamKStreamRightJoinSide<K, VLeft, VRight, VOut> extends
KStreamKStreamJoin<K, VLeft, VRight, VOut, VRight, VLeft>
--^-- --^---
VThis VOther
```
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