spring-batch MethodInvokingTaskletAdapter 源码
spring-batch MethodInvokingTaskletAdapter 代码
文件路径：/spring-batch-core/src/main/java/org/springframework/batch/core/step/tasklet/MethodInvokingTaskletAdapter.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.tasklet;
import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.StepContribution;
import org.springframework.batch.core.scope.context.ChunkContext;
import org.springframework.batch.item.adapter.AbstractMethodInvokingDelegator;
import org.springframework.batch.repeat.RepeatStatus;
import org.springframework.lang.Nullable;
/**
* A {@link Tasklet} that wraps a method in a POJO. By default the return value is
* {@link ExitStatus#COMPLETED} unless the delegate POJO itself returns an
* {@link ExitStatus}. The POJO method is usually going to have no arguments, but a static
* argument or array of arguments can be used by setting the arguments property.
*
* @see AbstractMethodInvokingDelegator
* @author Dave Syer
* @author Mahmoud Ben Hassine
*
*/
public class MethodInvokingTaskletAdapter extends AbstractMethodInvokingDelegator<Object> implements Tasklet {
/**
* Delegate execution to the target object and translate the return value to an
* {@link ExitStatus} by invoking a method in the delegate POJO. Ignores the
* {@link StepContribution} and the attributes.
*
* @see Tasklet#execute(StepContribution, ChunkContext)
*/
@Nullable
@Override
public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {
if (getArguments() == null) {
setArguments(new Object[] { contribution, chunkContext });
}
contribution.setExitStatus(mapResult(invokeDelegateMethod()));
return RepeatStatus.FINISHED;
}
/**
* If the result is an {@link ExitStatus} already just return that, otherwise return
* {@link ExitStatus#COMPLETED}.
* @param result the value returned by the delegate method
* @return an {@link ExitStatus} consistent with the result
*/
protected ExitStatus mapResult(Object result) {
if (result instanceof ExitStatus) {
return (ExitStatus) result;
}
return ExitStatus.COMPLETED;
}
}
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