spring-batch Tasklet 源码
spring-batch Tasklet 代码
文件路径：/spring-batch-core/src/main/java/org/springframework/batch/core/step/tasklet/Tasklet.java
/*
* Copyright 2006-2022 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.tasklet;
import org.springframework.batch.core.StepContribution;
import org.springframework.batch.core.scope.context.ChunkContext;
import org.springframework.batch.repeat.RepeatStatus;
import org.springframework.lang.Nullable;
/**
* Strategy for processing in a step.
*
* @author Dave Syer
* @author Mahmoud Ben Hassine
* @author Taeik Lim
*
*/
@FunctionalInterface
public interface Tasklet {
/**
* Given the current context in the form of a step contribution, do whatever is
* necessary to process this unit inside a transaction. Implementations return
* {@link RepeatStatus#FINISHED} if finished. If not they return
* {@link RepeatStatus#CONTINUABLE}. On failure throws an exception.
* @param contribution mutable state to be passed back to update the current step
* execution
* @param chunkContext attributes shared between invocations but not between restarts
* @return an {@link RepeatStatus} indicating whether processing is continuable.
* Returning {@code null} is interpreted as {@link RepeatStatus#FINISHED}
* @throws Exception thrown if error occurs during execution.
*/
@Nullable
RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception;
}
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