001/* 002 * Copyright 2006-2007 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.batch.item.jms; 018 019import javax.jms.JMSException; 020import javax.jms.Message; 021 022import org.springframework.batch.item.UnexpectedInputException; 023import org.springframework.retry.interceptor.NewMethodArgumentsIdentifier; 024 025/** 026 * A {@link NewMethodArgumentsIdentifier} for JMS that looks for a message in 027 * the arguments and checks its delivery status. 028 * 029 * @author Dave Syer 030 * 031 */ 032public class JmsNewMethodArgumentsIdentifier<T> implements NewMethodArgumentsIdentifier { 033 034 /** 035 * If any of the arguments is a message, check the JMS re-delivered flag and 036 * return it, otherwise return false to be on the safe side. 037 * 038 * @see org.springframework.retry.interceptor.NewMethodArgumentsIdentifier#isNew(java.lang.Object[]) 039 */ 040 @Override 041 public boolean isNew(Object[] args) { 042 043 for (Object item : args) { 044 if (item instanceof Message) { 045 try { 046 return !((Message) item).getJMSRedelivered(); 047 } 048 catch (JMSException e) { 049 throw new UnexpectedInputException("Could not extract message ID", e); 050 } 051 } 052 } 053 return false; 054 } 055 056}