kafka Query 源码
kafka Query 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/query/Query.java
/*
* 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;
/**
* Marker interface that all interactive queries must implement (see {@link
* org.apache.kafka.streams.KafkaStreams#query(StateQueryRequest)}).
* <p>
* You can find all available queries by searching for classes implementing this interface.
* <p>
* Kafka Streams will pass unknown query types straight through into the bytes stores, so callers
* can add custom queries by implementing this interface and providing custom stores that handle
* them (via {@link org.apache.kafka.streams.state.StoreSupplier}s.
* <p>
* See KIP-796 (https://cwiki.apache.org/confluence/x/34xnCw) for more details.
*
* @param <R> The type of the result returned by this query.
*/
public interface Query<R> {
}
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