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.RuntimeCamelException;
022 import org.apache.camel.Exchange;
023 import org.apache.camel.processor.DelegateProcessor;
024 import org.apache.camel.spi.Policy;
025 import org.apache.commons.logging.Log;
026 import org.apache.commons.logging.LogFactory;
027 import org.springframework.transaction.TransactionDefinition;
028 import org.springframework.transaction.TransactionStatus;
029 import org.springframework.transaction.support.TransactionCallbackWithoutResult;
030 import org.springframework.transaction.support.TransactionTemplate;
031
032 /**
033 * Wraps the processor in a Spring transaction
034 *
035 * @version $Revision: 1.1 $
036 */
037 public class SpringTransactionPolicy<E> implements Policy<E> {
038 private static final transient Log log = LogFactory.getLog(SpringTransactionPolicy.class);
039
040 private TransactionTemplate template;
041
042 public SpringTransactionPolicy() {
043 }
044
045 public SpringTransactionPolicy(TransactionTemplate template) {
046 this.template = template;
047 }
048
049 public Processor wrap(Processor processor) {
050 final TransactionTemplate transactionTemplate = getTemplate();
051 if (transactionTemplate == null) {
052 log.warn("No TransactionTemplate available so transactions will not be enabled!");
053 return processor;
054 }
055
056 return new DelegateProcessor(processor) {
057
058 public void process(final Exchange exchange) {
059 transactionTemplate.execute(new TransactionCallbackWithoutResult() {
060 protected void doInTransactionWithoutResult(TransactionStatus status) {
061 try {
062 processNext(exchange);
063 } catch (Exception e) {
064 throw new RuntimeCamelException(e);
065 }
066 }
067 });
068 }
069
070 @Override
071 public String toString() {
072 return "SpringTransactionPolicy:"+propagationBehaviorToString(transactionTemplate.getPropagationBehavior())+"[" + getNext() + "]";
073 }
074
075 private String propagationBehaviorToString(int propagationBehavior) {
076 switch( propagationBehavior ) {
077 case TransactionDefinition.PROPAGATION_MANDATORY:
078 return "PROPAGATION_MANDATORY";
079 case TransactionDefinition.PROPAGATION_NESTED:
080 return "PROPAGATION_NESTED";
081 case TransactionDefinition.PROPAGATION_NEVER:
082 return "PROPAGATION_NEVER";
083 case TransactionDefinition.PROPAGATION_NOT_SUPPORTED:
084 return "PROPAGATION_NOT_SUPPORTED";
085 case TransactionDefinition.PROPAGATION_REQUIRED:
086 return "PROPAGATION_REQUIRED";
087 case TransactionDefinition.PROPAGATION_REQUIRES_NEW:
088 return "PROPAGATION_REQUIRES_NEW";
089 case TransactionDefinition.PROPAGATION_SUPPORTS:
090 return "PROPAGATION_SUPPORTS";
091 }
092 return "UNKOWN";
093 }
094 };
095 }
096
097 public TransactionTemplate getTemplate() {
098 return template;
099 }
100
101 public void setTemplate(TransactionTemplate template) {
102 this.template = template;
103 }
104 }