/*
* 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
*
* 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.jms;
import javax.jms.JMSException;
import javax.jms.Message;
import org.springframework.batch.item.UnexpectedInputException;
import org.springframework.retry.interceptor.NewMethodArgumentsIdentifier;
/**
* A {@link NewMethodArgumentsIdentifier} for JMS that looks for a message in
* the arguments and checks its delivery status.
*
* @author Dave Syer
*
*/
public class JmsNewMethodArgumentsIdentifier<T> implements NewMethodArgumentsIdentifier {
/**
* If any of the arguments is a message, check the JMS re-delivered flag and
* return it, otherwise return false to be on the safe side.
*
* @see org.springframework.retry.interceptor.NewMethodArgumentsIdentifier#isNew(java.lang.Object[])
*/
@Override
public boolean isNew(Object[] args) {
for (Object item : args) {
if (item instanceof Message) {
try {
return !((Message) item).getJMSRedelivered();
}
catch (JMSException e) {
throw new UnexpectedInputException("Could not extract message ID", e);
}
}
}
return false;
}
}