[GitHub] [kafka] mjsax commented on a diff in pull request #13264: KAFKA-14491: [12/N] Relax requirement that KTable stores must be TimestampedKVStores

["mjsax (via GitHub)" <gi...@apache.org>]

mjsax commented on code in PR #13264:
URL: https://github.com/apache/kafka/pull/13264#discussion_r1117760309


##########
streams/src/main/java/org/apache/kafka/streams/state/internals/KeyValueStoreWrapper.java:
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@@ -0,0 +1,204 @@
+/*
+ * 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.state.internals;
+
+import org.apache.kafka.streams.errors.InvalidStateStoreException;
+import org.apache.kafka.streams.processor.StateStore;
+import org.apache.kafka.streams.processor.StateStoreContext;
+import org.apache.kafka.streams.processor.api.ProcessorContext;
+import org.apache.kafka.streams.query.Position;
+import org.apache.kafka.streams.query.PositionBound;
+import org.apache.kafka.streams.query.Query;
+import org.apache.kafka.streams.query.QueryConfig;
+import org.apache.kafka.streams.query.QueryResult;
+import org.apache.kafka.streams.state.TimestampedKeyValueStore;
+import org.apache.kafka.streams.state.ValueAndTimestamp;
+import org.apache.kafka.streams.state.VersionedKeyValueStore;
+import org.apache.kafka.streams.state.VersionedRecord;
+
+/**
+ * A wrapper class for non-windowed key-value stores used within the DSL. All such stores are
+ * instances of either {@link TimestampedKeyValueStore} or {@link VersionedKeyValueStore}.
+ *
+ * @param <K> The key type
+ * @param <V> The value type
+ */
+public class KeyValueStoreWrapper<K, V> implements StateStore {
+
+    private TimestampedKeyValueStore<K, V> timestampedStore = null;
+    private VersionedKeyValueStore<K, V> versionedStore = null;
+
+    public KeyValueStoreWrapper(final ProcessorContext<?, ?> context, final String storeName) {
+        try {
+            // first try timestamped store
+            timestampedStore = context.getStateStore(storeName);
+            return;
+        } catch (final ClassCastException e) {
+            // ignore since could be versioned store instead
+        }
+
+        try {
+            // next try versioned store
+            versionedStore = context.getStateStore(storeName);
+        } catch (final ClassCastException e) {
+            throw new InvalidStateStoreException("KTable source state store must implement either TimestampedKeyValueStore or VersionedKeyValueStore.");

Review Comment:
   Should we include the type of the store we found in the error message?



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