spring-batch JmsMethodArgumentsKeyGenerator 源码
spring-batch JmsMethodArgumentsKeyGenerator 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/jms/JmsMethodArgumentsKeyGenerator.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.item.jms;
import jakarta.jms.JMSException;
import jakarta.jms.Message;
import org.springframework.batch.item.UnexpectedInputException;
import org.springframework.retry.interceptor.MethodArgumentsKeyGenerator;
/**
* A {@link MethodArgumentsKeyGenerator} for JMS
*
* @author Dave Syer
* @author Mahmoud Ben Hassine
*
*/
public class JmsMethodArgumentsKeyGenerator implements MethodArgumentsKeyGenerator {
/**
* If the message is a {@link Message} then returns the JMS message ID. Otherwise just
* return the first argument.
*
* @see org.springframework.retry.interceptor.MethodArgumentsKeyGenerator#getKey(Object[])
* @throws UnexpectedInputException if the JMS id cannot be determined from a JMS
* Message
* @throws IllegalArgumentException if the arguments are empty
*/
@Override
public Object getKey(Object[] items) {
for (Object item : items) {
if (item instanceof Message) {
try {
return ((Message) item).getJMSMessageID();
}
catch (JMSException e) {
throw new UnexpectedInputException("Could not extract message ID", e);
}
}
}
if (items.length == 0) {
throw new IllegalArgumentException(
"Method parameters are empty. The key generator cannot determine a unique key.");
}
return items[0];
}
}
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