spring-batch JmsItemWriter 源码
spring-batch JmsItemWriter 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/jms/JmsItemWriter.java
/*
* Copyright 2006-2007 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.item.jms;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.batch.item.ItemWriter;
import org.springframework.jms.core.JmsOperations;
import org.springframework.jms.core.JmsTemplate;
import org.springframework.util.Assert;
import java.util.List;
/**
* An {@link ItemWriter} for JMS using a {@link JmsTemplate}. The template should have a
* default destination, which will be used to send items in {@link #write(List)}.<br>
* <br>
*
* The implementation is thread-safe after its properties are set (normal singleton
* behavior).
*
* @author Dave Syer
*
*/
public class JmsItemWriter<T> implements ItemWriter<T> {
protected Log logger = LogFactory.getLog(getClass());
private JmsOperations jmsTemplate;
/**
* Setter for JMS template.
* @param jmsTemplate a {@link JmsOperations} instance
*/
public void setJmsTemplate(JmsOperations jmsTemplate) {
this.jmsTemplate = jmsTemplate;
if (jmsTemplate instanceof JmsTemplate) {
JmsTemplate template = (JmsTemplate) jmsTemplate;
Assert.isTrue(template.getDefaultDestination() != null || template.getDefaultDestinationName() != null,
"JmsTemplate must have a defaultDestination or defaultDestinationName!");
}
}
/**
* Send the items one-by-one to the default destination of the JMS template.
*
* @see org.springframework.batch.item.ItemWriter#write(java.util.List)
*/
@Override
public void write(List<? extends T> items) throws Exception {
if (logger.isDebugEnabled()) {
logger.debug("Writing to JMS with " + items.size() + " items.");
}
for (T item : items) {
jmsTemplate.convertAndSend(item);
}
}
}
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