001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.activemq.util;
018    
019    import java.io.IOException;
020    import org.apache.activemq.broker.ConnectionContext;
021    import org.apache.activemq.store.PersistenceAdapter;
022    import org.slf4j.Logger;
023    import org.slf4j.LoggerFactory;
024    
025    /**
026     * A helper class for running code with a PersistenceAdapter in a transaction.
027     * 
028     * 
029     */
030    public class TransactionTemplate {
031        private static final Logger LOG = LoggerFactory.getLogger(TransactionTemplate.class);
032        private PersistenceAdapter persistenceAdapter;
033        private ConnectionContext context;
034    
035        public TransactionTemplate(PersistenceAdapter persistenceAdapter, ConnectionContext context) {
036            this.persistenceAdapter = persistenceAdapter;
037            this.context = context;
038        }
039    
040        public void run(Callback task) throws IOException {
041            persistenceAdapter.beginTransaction(context);
042            Throwable throwable = null;
043            try {
044                task.execute();
045            } catch (IOException t) {
046                throwable = t;
047                throw t;
048            } catch (RuntimeException t) {
049                throwable = t;
050                throw t;
051            } catch (Throwable t) {
052                throwable = t;
053                throw IOExceptionSupport.create("Persistence task failed: " + t, t);
054            } finally {
055                if (throwable == null) {
056                    persistenceAdapter.commitTransaction(context);
057                } else {
058                    LOG.error("Having to Rollback - caught an exception: " + throwable);
059                    persistenceAdapter.rollbackTransaction(context);
060                }
061            }
062        }
063    
064        public ConnectionContext getContext() {
065            return context;
066        }
067    
068        public PersistenceAdapter getPersistenceAdapter() {
069            return persistenceAdapter;
070        }
071    }