spring-batch SynchronizedItemStreamWriter 源码
spring-batch SynchronizedItemStreamWriter 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/SynchronizedItemStreamWriter.java
/*
* Copyright 2020 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
*
* http://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.item.support;
import org.springframework.batch.item.ExecutionContext;
import org.springframework.batch.item.ItemStreamException;
import org.springframework.batch.item.ItemStreamWriter;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;
import java.util.List;
/**
* An {@link ItemStreamWriter} decorator with a synchronized
* {@link SynchronizedItemStreamWriter#write write()} method.
*
* This decorator is useful when using a non thread-safe item writer in a multi-threaded
* step. Typical delegate examples are the
* {@link org.springframework.batch.item.json.JsonFileItemWriter JsonFileItemWriter} and
* {@link org.springframework.batch.item.xml.StaxEventItemWriter StaxEventItemWriter}.
*
* <p>
* <strong>It should be noted that synchronizing writes might introduce some performance
* degradation, so this decorator should be used wisely and only when necessary. For
* example, using a {@link org.springframework.batch.item.file.FlatFileItemWriter
* FlatFileItemWriter} in a multi-threaded step does NOT require synchronizing writes, so
* using this decorator in such use case might be counter-productive.</strong>
* </p>
*
* @author Dimitrios Liapis
* @author Mahmoud Ben Hassine
* @param <T> type of object being written
*/
public class SynchronizedItemStreamWriter<T> implements ItemStreamWriter<T>, InitializingBean {
private ItemStreamWriter<T> delegate;
/**
* Set the delegate {@link ItemStreamWriter}.
* @param delegate the delegate to set
*/
public void setDelegate(ItemStreamWriter<T> delegate) {
this.delegate = delegate;
}
/**
* This method delegates to the {@code write} method of the {@code delegate}.
*/
@Override
public synchronized void write(List<? extends T> items) throws Exception {
this.delegate.write(items);
}
@Override
public void open(ExecutionContext executionContext) throws ItemStreamException {
this.delegate.open(executionContext);
}
@Override
public void update(ExecutionContext executionContext) throws ItemStreamException {
this.delegate.update(executionContext);
}
@Override
public void close() throws ItemStreamException {
this.delegate.close();
}
@Override
public void afterPropertiesSet() throws Exception {
Assert.notNull(this.delegate, "A delegate item writer is required");
}
}
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