| 1 | /* |
| 2 | * Copyright 2006-2007 the original author or authors. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.springframework.batch.item.jms; |
| 18 | |
| 19 | import javax.jms.JMSException; |
| 20 | import javax.jms.Message; |
| 21 | |
| 22 | import org.springframework.batch.item.UnexpectedInputException; |
| 23 | import org.springframework.retry.interceptor.NewMethodArgumentsIdentifier; |
| 24 | |
| 25 | /** |
| 26 | * A {@link NewMethodArgumentsIdentifier} for JMS that looks for a message in |
| 27 | * the arguments and checks its delivery status. |
| 28 | * |
| 29 | * @author Dave Syer |
| 30 | * |
| 31 | */ |
| 32 | public class JmsNewMethodArgumentsIdentifier<T> implements NewMethodArgumentsIdentifier { |
| 33 | |
| 34 | /** |
| 35 | * If any of the arguments is a message, check the JMS re-delivered flag and |
| 36 | * return it, otherwise return false to be on the safe side. |
| 37 | * |
| 38 | * @see org.springframework.retry.interceptor.NewMethodArgumentsIdentifier#isNew(java.lang.Object[]) |
| 39 | */ |
| 40 | @Override |
| 41 | public boolean isNew(Object[] args) { |
| 42 | |
| 43 | for (Object item : args) { |
| 44 | if (item instanceof Message) { |
| 45 | try { |
| 46 | return !((Message) item).getJMSRedelivered(); |
| 47 | } |
| 48 | catch (JMSException e) { |
| 49 | throw new UnexpectedInputException("Could not extract message ID", e); |
| 50 | } |
| 51 | } |
| 52 | } |
| 53 | return false; |
| 54 | } |
| 55 | |
| 56 | } |