kafka FixedKeyProcessorSupplier 源码
kafka FixedKeyProcessorSupplier 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/processor/api/FixedKeyProcessorSupplier.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.processor.api;
import org.apache.kafka.streams.processor.ConnectedStoreProvider;
import java.util.function.Supplier;
/**
* A processor supplier that can create one or more {@link FixedKeyProcessor} instances.
* <p>
* The supplier should always generate a new instance each time {@link FixedKeyProcessorSupplier#get()} gets called. Creating
* a single {@link FixedKeyProcessor} object and returning the same object reference in {@link FixedKeyProcessorSupplier#get()} would be
* a violation of the supplier pattern and leads to runtime exceptions.
*
* @param <KIn> the type of input keys
* @param <VIn> the type of input values
* @param <VOut> the type of output values
*/
@FunctionalInterface
public interface FixedKeyProcessorSupplier<KIn, VIn, VOut>
extends ConnectedStoreProvider, Supplier<FixedKeyProcessor<KIn, VIn, VOut>> {
/**
* Return a newly constructed {@link FixedKeyProcessor} instance.
* The supplier should always generate a new instance each time {@code FixedKeyProcessorSupplier#get()} gets called.
* <p>
* Creating a single {@link FixedKeyProcessor} object and returning the same object reference in {@code FixedKeyProcessorSupplier#get()}
* is a violation of the supplier pattern and leads to runtime exceptions.
*
* @return a new {@link FixedKeyProcessor} instance
*/
FixedKeyProcessor<KIn, VIn, VOut> get();
}
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