kafka ValueTransformerWithKeySupplier 源码
kafka ValueTransformerWithKeySupplier 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/ValueTransformerWithKeySupplier.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.kstream;
import org.apache.kafka.streams.processor.ConnectedStoreProvider;
import java.util.function.Supplier;
/**
* A {@code ValueTransformerWithKeySupplier} interface which can create one or more {@link ValueTransformerWithKey} instances.
* <p>
* The supplier should always generate a new instance each time {@link ValueTransformerWithKeySupplier#get()} gets called. Creating
* a single {@link ValueTransformerWithKey} object and returning the same object reference in {@link ValueTransformerWithKeySupplier#get()} would be
* a violation of the supplier pattern and leads to runtime exceptions.
*
* @param <K> key type
* @param <V> value type
* @param <VR> transformed value type
* @see ValueTransformer
* @see ValueTransformerWithKey
* @see KStream#transformValues(ValueTransformerSupplier, String...)
* @see KStream#transformValues(ValueTransformerWithKeySupplier, String...)
* @see Transformer
* @see TransformerSupplier
* @see KStream#transform(TransformerSupplier, String...)
*/
public interface ValueTransformerWithKeySupplier<K, V, VR> extends ConnectedStoreProvider, Supplier<ValueTransformerWithKey<K, V, VR>> {
/**
* Return a newly constructed {@link ValueTransformerWithKey} instance.
* The supplier should always generate a new instance each time {@link ValueTransformerWithKeySupplier#get()} gets called.
* <p>
* Creating a single {@link ValueTransformerWithKey} object and returning the same object reference in {@link ValueTransformerWithKeySupplier#get()}
* is a violation of the supplier pattern and leads to runtime exceptions.
*
* @return a new {@link ValueTransformerWithKey} instance
* @return a newly constructed {@link ValueTransformerWithKey} instance
*/
ValueTransformerWithKey<K, V, VR> get();
}
相关信息
相关文章
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
7、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦