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.camel.spring.spi;
018    
019    import org.apache.camel.Processor;
020    import org.apache.camel.builder.ErrorHandlerBuilder;
021    import org.apache.camel.builder.ErrorHandlerBuilderRef;
022    import org.apache.camel.spi.RouteContext;
023    import org.apache.camel.spi.TransactedPolicy;
024    import org.apache.camel.util.ObjectHelper;
025    import org.apache.commons.logging.Log;
026    import org.apache.commons.logging.LogFactory;
027    import org.springframework.transaction.PlatformTransactionManager;
028    import org.springframework.transaction.support.TransactionTemplate;
029    
030    /**
031     * Wraps the processor in a Spring transaction
032     *
033     * @version $Revision: 829746 $
034     */
035    public class SpringTransactionPolicy implements TransactedPolicy {
036        private static final transient Log LOG = LogFactory.getLog(SpringTransactionPolicy.class);
037        private TransactionTemplate template;
038        private String propagationBehaviorName;
039        private PlatformTransactionManager transactionManager;
040    
041        /**
042         * Default constructor for easy spring configuration.
043         */
044        public SpringTransactionPolicy() {
045        }
046    
047        public SpringTransactionPolicy(TransactionTemplate template) {
048            this.template = template;
049        }
050    
051        public SpringTransactionPolicy(PlatformTransactionManager transactionManager) {
052            this.transactionManager = transactionManager;
053        }
054    
055        public Processor wrap(RouteContext routeContext, Processor processor) {
056            TransactionErrorHandler answer;
057    
058            // the goal is to configure the error handler builder on the route as a transacted error handler,
059            // either its already a transacted or if not we replace it with a transacted one that we configure here
060            // and wrap the processor in the transacted error handler as we can have transacted routes that change
061            // propagation behavior, eg: from A required -> B -> requiresNew C (advanced use-case)
062            // if we should not support this we do not need to wrap the processor as we only need one transacted error handler
063    
064            // find the existing error handler builder
065            ErrorHandlerBuilder builder = routeContext.getRoute().getErrorHandlerBuilder();
066    
067            // check if its a ref if so then do a lookup
068            if (builder instanceof ErrorHandlerBuilderRef) {
069                // its a reference to a error handler so lookup the reference
070                ErrorHandlerBuilderRef builderRef = (ErrorHandlerBuilderRef) builder;
071                String ref = builderRef.getRef();
072                // only lookup if there was explicit an error handler builder configured
073                // otherwise its just the "default" that has not explicit been configured
074                // and if so then we can safely replace that with our transacted error handler
075                if (ErrorHandlerBuilderRef.isErrorHandlerBuilderConfigured(ref)) {
076                    if (LOG.isDebugEnabled()) {
077                        LOG.debug("Looking up ErrorHandlerBuilder with ref: " + ref);
078                    }
079                    builder = ErrorHandlerBuilderRef.lookupErrorHandlerBuilder(routeContext, ref);
080                }
081            }
082    
083            if (builder != null && builder.supportTransacted()) {
084                // already a TX error handler then we are good to go
085                if (LOG.isDebugEnabled()) {
086                    LOG.debug("The ErrorHandlerBuilder configured is already a TransactionErrorHandlerBuilder: " + builder);
087                }
088                answer = createTransactionErrorHandler(routeContext, processor, builder);
089                answer.setExceptionPolicy(builder.getExceptionPolicyStrategy());
090                // configure our answer based on the existing error handler
091                builder.configure(answer);
092            } else {
093                // no transaction error handler builder configure so create a temporary one as we got all
094                // the needed information form the configured builder anyway this allow us to use transacted
095                // routes anyway even though the error handler is not transactional, eg ease of configuration
096                if (LOG.isDebugEnabled()) {
097                    if (builder != null) {
098                        LOG.debug("The ErrorHandlerBuilder configured is not a TransactionErrorHandlerBuilder: " + builder);
099                    } else {
100                        LOG.debug("No ErrorHandlerBuilder configured, will use default TransactionErrorHandlerBuilder settings");
101                    }
102                }
103                TransactionErrorHandlerBuilder txBuilder = new TransactionErrorHandlerBuilder();
104                txBuilder.setTransactionTemplate(getTransactionTemplate());
105                txBuilder.setSpringTransactionPolicy(this);
106                if (builder != null) {
107                    // use error handlers from the configured builder
108                    txBuilder.setErrorHandlers(builder.getErrorHandlers());
109                }
110                answer = createTransactionErrorHandler(routeContext, processor, txBuilder);
111                answer.setExceptionPolicy(txBuilder.getExceptionPolicyStrategy());
112                // configure our answer based on the existing error handler
113                txBuilder.configure(answer);
114    
115                // set the route to use our transacted error handler builder
116                routeContext.getRoute().setErrorHandlerBuilder(txBuilder);
117            }
118    
119            // return with wrapped transacted error handler
120            return answer;
121        }
122    
123        protected TransactionErrorHandler createTransactionErrorHandler(RouteContext routeContext, Processor processor, ErrorHandlerBuilder builder) {
124            TransactionErrorHandler answer;
125            try {
126                answer = (TransactionErrorHandler) builder.createErrorHandler(routeContext, processor);
127            } catch (Exception e) {
128                throw ObjectHelper.wrapRuntimeCamelException(e);
129            }
130            return answer;
131        }
132    
133        public TransactionTemplate getTransactionTemplate() {
134            if (template == null) {
135                ObjectHelper.notNull(transactionManager, "transactionManager");
136                template = new TransactionTemplate(transactionManager);
137                if (propagationBehaviorName != null) {
138                    template.setPropagationBehaviorName(propagationBehaviorName);
139                }
140            }
141            return template;
142        }
143    
144        public void setTransactionTemplate(TransactionTemplate template) {
145            this.template = template;
146        }
147    
148        public void setTransactionManager(PlatformTransactionManager transactionManager) {
149            this.transactionManager = transactionManager;
150        }
151    
152        public PlatformTransactionManager getTransactionManager() {
153            return transactionManager;
154        }
155    
156        public void setPropagationBehaviorName(String propagationBehaviorName) {
157            this.propagationBehaviorName = propagationBehaviorName;
158        }
159    
160        public String getPropagationBehaviorName() {
161            return propagationBehaviorName;
162        }
163    }