kafka ContextualProcessor 源码
kafka ContextualProcessor 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/processor/api/ContextualProcessor.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;
/**
* An abstract implementation of {@link Processor} that manages the {@link ProcessorContext} instance and provides default no-op
* implementation of {@link #close()}.
*
* @param <KIn> the type of input keys
* @param <VIn> the type of input values
* @param <KOut> the type of output keys
* @param <VOut> the type of output values
*/
public abstract class ContextualProcessor<KIn, VIn, KOut, VOut> implements Processor<KIn, VIn, KOut, VOut> {
private ProcessorContext<KOut, VOut> context;
protected ContextualProcessor() {}
@Override
public void init(final ProcessorContext<KOut, VOut> context) {
this.context = context;
}
/**
* Get the processor's context set during {@link #init(ProcessorContext) initialization}.
*
* @return the processor context; null only when called prior to {@link #init(ProcessorContext) initialization}.
*/
protected final ProcessorContext<KOut, VOut> context() {
return context;
}
}
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