aliehsaeedii commented on code in PR #14596:
URL: https://github.com/apache/kafka/pull/14596#discussion_r1370052232
##########
streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredVersionedKeyValueStore.java:
##########
@@ -148,13 +205,38 @@ protected <R> QueryResult<R> runRangeQuery(final Query<R>
query,
throw new UnsupportedOperationException("Versioned stores do not
support RangeQuery queries at this time.");
}
+ @SuppressWarnings("unchecked")
@Override
protected <R> QueryResult<R> runKeyQuery(final Query<R> query,
- final PositionBound
positionBound,
- final QueryConfig config) {
- // throw exception for now to reserve the ability to implement
this in the future
- // without clashing with users' custom implementations in the
meantime
- throw new UnsupportedOperationException("Versioned stores do not
support KeyQuery queries at this time.");
+ final PositionBound positionBound,
+ final QueryConfig config) {
+ if (query instanceof VersionedKeyQuery) {
+ final QueryResult<R> result;
+ final VersionedKeyQuery<K, V> typedKeyQuery =
(VersionedKeyQuery<K, V>) query;
+ VersionedKeyQuery<Bytes, byte[]> rawKeyQuery;
+ if (typedKeyQuery.asOfTimestamp().isPresent()) {
+ rawKeyQuery =
VersionedKeyQuery.withKey(keyBytes(typedKeyQuery.key()));
+ rawKeyQuery =
rawKeyQuery.asOf(typedKeyQuery.asOfTimestamp().get());
+ } else {
+ rawKeyQuery =
VersionedKeyQuery.withKey(keyBytes(typedKeyQuery.key()));
+ }
+ final QueryResult<VersionedRecord<byte[]>> rawResult =
+ wrapped().query(rawKeyQuery, positionBound, config);
+ if (rawResult.isSuccess()) {
+ final Function<byte[], ValueAndTimestamp<V>> deserializer
= getDeserializeValue(plainValueSerdes);
Review Comment:
> Why is the type `ValueAndTimestamp`? Should it not be `VersionedRecord`?
Thanks Matthias. Good point. I wanted to discuss it with you.
I just did it to reuse the `ValueAndTimestampDeserializer` class. Moreover,
inside `MeteredVersionedKeyValueStoreInternal` every other method uses
`ValueAndTimestamp` as well.
Btw, do you agree to implement a new class `VersionedRecordDeserializer`?
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