kafka ProcessorSupplier 源码
kafka ProcessorSupplier 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/processor/ProcessorSupplier.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;
import org.apache.kafka.streams.Topology;
import java.util.function.Supplier;
/**
* A processor supplier that can create one or more {@link Processor} instances.
* <p>
* It is used in {@link Topology} for adding new processor operators, whose generated
* topology can then be replicated (and thus creating one or more {@link Processor} instances)
* and distributed to multiple stream threads.
* <p>
* The supplier should always generate a new instance each time {@link ProcessorSupplier#get()} gets called. Creating
* a single {@link Processor} object and returning the same object reference in {@link ProcessorSupplier#get()} would be
* a violation of the supplier pattern and leads to runtime exceptions.
*
* @param <K> the type of keys
* @param <V> the type of values
* @deprecated Since 3.0. Use {@link org.apache.kafka.streams.processor.api.ProcessorSupplier} instead.
*/
@Deprecated
public interface ProcessorSupplier<K, V> extends ConnectedStoreProvider, Supplier<Processor<K, V>> {
/**
* Return a newly constructed {@link Processor} instance.
* The supplier should always generate a new instance each time {@link ProcessorSupplier#get()} gets called.
* <p>
* Creating a single {@link Processor} object and returning the same object reference in {@link ProcessorSupplier#get()}
* is a violation of the supplier pattern and leads to runtime exceptions.
*
* @return a newly constructed {@link Processor} instance
*/
Processor<K, V> get();
}
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