spring-batch JobParameterExecutionContextCopyListener 源码
spring-batch JobParameterExecutionContextCopyListener 代码
文件路径：/spring-batch-core/src/main/java/org/springframework/batch/core/listener/JobParameterExecutionContextCopyListener.java
/*
* Copyright 2006-2021 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.listener;
import java.util.Arrays;
import java.util.Collection;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.StepExecutionListener;
import org.springframework.batch.item.ExecutionContext;
/**
* This class can be used to automatically copy items from the {@link JobParameters} to
* the {@link Step} {@link ExecutionContext}. A list of keys should be provided that
* correspond to the items in the {@link Step} {@link ExecutionContext} that should be
* copied.
*
* @author Dave Syer
* @author Mahmoud Ben Hassine
* @since 2.0
*/
public class JobParameterExecutionContextCopyListener implements StepExecutionListener {
private Collection<String> keys = null;
/**
* @param keys A list of keys corresponding to items in the {@link JobParameters} that
* should be copied.
*/
public void setKeys(String[] keys) {
this.keys = Arrays.asList(keys);
}
/**
* Copy attributes from the {@link JobParameters} to the {@link Step}
* {@link ExecutionContext}, if not already present. The key is already present we
* assume that a restart is in operation and the previous value is needed. If the
* provided keys are empty defaults to copy all keys in the {@link JobParameters}.
*/
@Override
public void beforeStep(StepExecution stepExecution) {
ExecutionContext stepContext = stepExecution.getExecutionContext();
JobParameters jobParameters = stepExecution.getJobParameters();
Collection<String> keys = this.keys;
if (keys == null) {
keys = jobParameters.getParameters().keySet();
}
for (String key : keys) {
if (!stepContext.containsKey(key)) {
stepContext.put(key, jobParameters.getParameters().get(key).getValue());
}
}
}
}
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