spring-batch ChunkOrientedTasklet 源码
spring-batch ChunkOrientedTasklet 代码
文件路径：/spring-batch-core/src/main/java/org/springframework/batch/core/step/item/ChunkOrientedTasklet.java
/*
* Copyright 2006-2019 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.batch.core.step.item;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.batch.core.StepContribution;
import org.springframework.batch.core.scope.context.ChunkContext;
import org.springframework.batch.core.step.tasklet.Tasklet;
import org.springframework.batch.repeat.RepeatStatus;
import org.springframework.lang.Nullable;
/**
* A {@link Tasklet} implementing variations on read-process-write item handling.
*
* @author Dave Syer
* @param <I> input item type
*/
public class ChunkOrientedTasklet<I> implements Tasklet {
private static final String INPUTS_KEY = "INPUTS";
private final ChunkProcessor<I> chunkProcessor;
private final ChunkProvider<I> chunkProvider;
private boolean buffering = true;
private static Log logger = LogFactory.getLog(ChunkOrientedTasklet.class);
public ChunkOrientedTasklet(ChunkProvider<I> chunkProvider, ChunkProcessor<I> chunkProcessor) {
this.chunkProvider = chunkProvider;
this.chunkProcessor = chunkProcessor;
}
/**
* Flag to indicate that items should be buffered once read. Defaults to true, which
* is appropriate for forward-only, non-transactional item readers. Main (or only) use
* case for setting this flag to false is a transactional JMS item reader.
* @param buffering indicator
*/
public void setBuffering(boolean buffering) {
this.buffering = buffering;
}
@Nullable
@Override
public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {
@SuppressWarnings("unchecked")
Chunk<I> inputs = (Chunk<I>) chunkContext.getAttribute(INPUTS_KEY);
if (inputs == null) {
inputs = chunkProvider.provide(contribution);
if (buffering) {
chunkContext.setAttribute(INPUTS_KEY, inputs);
}
}
chunkProcessor.process(contribution, inputs);
chunkProvider.postProcess(contribution, inputs);
// Allow a message coming back from the processor to say that we
// are not done yet
if (inputs.isBusy()) {
logger.debug("Inputs still busy");
return RepeatStatus.CONTINUABLE;
}
chunkContext.removeAttribute(INPUTS_KEY);
chunkContext.setComplete();
if (logger.isDebugEnabled()) {
logger.debug("Inputs not busy, ended: " + inputs.isEnd());
}
return RepeatStatus.continueIf(!inputs.isEnd());
}
}
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