hanyuzheng7 commented on code in PR #14570: URL: https://github.com/apache/kafka/pull/14570#discussion_r1382310274
########## streams/src/main/java/org/apache/kafka/streams/query/TimestampedKeyQuery.java: ########## @@ -0,0 +1,70 @@ +/* + * 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.query; + +import org.apache.kafka.common.annotation.InterfaceStability.Evolving; +import org.apache.kafka.streams.state.ValueAndTimestamp; + +import java.util.Objects; + +/** + * Interactive query for retrieving a single record based on its key. + */ +@Evolving +public final class TimestampedKeyQuery<K, V> implements Query<ValueAndTimestamp<V>> { + + private final K key; + private final boolean skipCache; + + private TimestampedKeyQuery(final K key, final boolean skipCache) { + this.key = Objects.requireNonNull(key); + this.skipCache = skipCache; + } + + /** + * Creates a query that will retrieve the record identified by {@code key} if it exists + * (or {@code null} otherwise). + * @param key The key to retrieve + * @param <K> The type of the key + * @param <V> The type of the value that will be retrieved + */ + public static <K, V> TimestampedKeyQuery<K, V> withKey(final K key) { + return new TimestampedKeyQuery<>(key, false); + } + + /** + * Specifies that the cache should be skipped during query evaluation. This means, that the query will always + * get forwarded to the underlying store. + */ + public TimestampedKeyQuery<K, V> skipCache() { + return new TimestampedKeyQuery<>(key, true); + } + + /** + * The key that was specified for this query. + */ Review Comment: ok -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
