001    /**
002     *
003     * Licensed to the Apache Software Foundation (ASF) under one or more
004     * contributor license agreements.  See the NOTICE file distributed with
005     * this work for additional information regarding copyright ownership.
006     * The ASF licenses this file to You under the Apache License, Version 2.0
007     * (the "License"); you may not use this file except in compliance with
008     * the License.  You may obtain a copy of the License at
009     *
010     * http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.camel.spring.spi;
019    
020    import org.apache.camel.Processor;
021    import org.apache.camel.processor.DelegateProcessor;
022    import org.apache.camel.spi.Interceptor;
023    import org.apache.commons.logging.Log;
024    import org.apache.commons.logging.LogFactory;
025    import org.springframework.transaction.TransactionStatus;
026    import org.springframework.transaction.support.TransactionCallbackWithoutResult;
027    import org.springframework.transaction.support.TransactionTemplate;
028    
029    /**
030     * Wraps the processor in a Spring transaction
031     *
032     * @version $Revision: 1.1 $
033     */
034    public class SpringTransactionInterceptor<E> implements Interceptor<E> {
035        private static final transient Log log = LogFactory.getLog(SpringTransactionInterceptor.class);
036    
037        private TransactionTemplate template;
038    
039        public SpringTransactionInterceptor() {
040        }
041    
042        public SpringTransactionInterceptor(TransactionTemplate template) {
043            this.template = template;
044        }
045    
046        public Processor<E> addIntercetors(Processor<E> processor) {
047            final TransactionTemplate transactionTemplate = getTemplate();
048            if (transactionTemplate == null) {
049                log.warn("No TransactionTemplate available so transactions will not be enabled!");
050                return processor;
051            }
052    
053            return new DelegateProcessor<E>(processor) {
054    
055                public void process(final E exchange) {
056                    transactionTemplate.execute(new TransactionCallbackWithoutResult() {
057                        protected void doInTransactionWithoutResult(TransactionStatus status) {
058                            processNext(exchange);
059                        }
060                    });
061                }
062    
063                @Override
064                public String toString() {
065                    return "SpringTransaction[" + getNext() + "]";
066                }
067            };
068        }
069    
070        public TransactionTemplate getTemplate() {
071            return template;
072        }
073    
074        public void setTemplate(TransactionTemplate template) {
075            this.template = template;
076        }
077    }