spring-batch CompositeStepExecutionListener 源码
spring-batch CompositeStepExecutionListener 代码
文件路径：/spring-batch-core/src/main/java/org/springframework/batch/core/listener/CompositeStepExecutionListener.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.listener;
import java.util.Arrays;
import java.util.Iterator;
import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.StepExecutionListener;
import org.springframework.core.Ordered;
import org.springframework.lang.Nullable;
/**
* @author Lucas Ward
* @author Dave Syer
*
*/
public class CompositeStepExecutionListener implements StepExecutionListener {
private OrderedComposite<StepExecutionListener> list = new OrderedComposite<>();
/**
* Public setter for the listeners.
* @param listeners list of {@link StepExecutionListener}s to be called when step
* execution events occur.
*/
public void setListeners(StepExecutionListener[] listeners) {
list.setItems(Arrays.asList(listeners));
}
/**
* Register additional listener.
* @param stepExecutionListener instance of {@link StepExecutionListener} to be
* registered.
*/
public void register(StepExecutionListener stepExecutionListener) {
list.add(stepExecutionListener);
}
/**
* Call the registered listeners in reverse order, respecting and prioritizing those
* that implement {@link Ordered}.
* @see org.springframework.batch.core.StepExecutionListener#afterStep(StepExecution)
*/
@Nullable
@Override
public ExitStatus afterStep(StepExecution stepExecution) {
for (Iterator<StepExecutionListener> iterator = list.reverse(); iterator.hasNext();) {
StepExecutionListener listener = iterator.next();
ExitStatus close = listener.afterStep(stepExecution);
stepExecution.setExitStatus(stepExecution.getExitStatus().and(close));
}
return stepExecution.getExitStatus();
}
/**
* Call the registered listeners in order, respecting and prioritizing those that
* implement {@link Ordered}.
* @see org.springframework.batch.core.StepExecutionListener#beforeStep(StepExecution)
*/
@Override
public void beforeStep(StepExecution stepExecution) {
for (Iterator<StepExecutionListener> iterator = list.iterator(); iterator.hasNext();) {
StepExecutionListener listener = iterator.next();
listener.beforeStep(stepExecution);
}
}
}
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