| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.camel.spring; |
| |
| import org.apache.camel.CamelContext; |
| import org.apache.camel.builder.RouteBuilder; |
| import org.apache.camel.spring.spi.SpringTransactionPolicy; |
| import org.apache.camel.spring.spi.TransactionErrorHandlerBuilder; |
| import org.springframework.context.ApplicationContext; |
| import org.springframework.context.ApplicationContextAware; |
| import org.springframework.transaction.PlatformTransactionManager; |
| import org.springframework.transaction.support.TransactionTemplate; |
| |
| /** |
| * An extension of the {@link RouteBuilder} to provide some additional helper |
| * methods |
| * |
| * @version |
| */ |
| public abstract class SpringRouteBuilder extends RouteBuilder implements ApplicationContextAware { |
| private ApplicationContext applicationContext; |
| |
| /** |
| * Looks up the bean with the given name in the application context and |
| * returns it, or throws an exception if the bean is not present or is not |
| * of the given type |
| * |
| * @param beanName the name of the bean in the application context |
| * @param type the type of the bean |
| * @return the bean |
| */ |
| public <T> T lookup(String beanName, Class<T> type) { |
| ApplicationContext context = getApplicationContext(); |
| return (T)context.getBean(beanName, type); |
| } |
| |
| /** |
| * Looks up the bean with the given type in the application context and |
| * returns it, or throws an exception if the bean is not present or there |
| * are multiple possible beans to choose from for the given type |
| * |
| * @param type the type of the bean |
| * @return the bean |
| */ |
| @SuppressWarnings("unchecked") |
| public <T> T lookup(Class<T> type) { |
| ApplicationContext context = getApplicationContext(); |
| String[] names = context.getBeanNamesForType(type, true, true); |
| if (names != null) { |
| int count = names.length; |
| if (count == 1) { |
| // lets instantiate the single bean |
| return (T)context.getBean(names[0]); |
| } else if (count > 1) { |
| throw new IllegalArgumentException("Too many beans in the application context of type: " + type + ". Found: " + count); |
| } |
| } |
| throw new IllegalArgumentException("No bean available in the application context of type: " + type); |
| } |
| |
| /** |
| * Returns the application context which has been configured via the |
| * {@link #setApplicationContext(ApplicationContext)} method or from the |
| * underlying {@link SpringCamelContext} |
| */ |
| public ApplicationContext getApplicationContext() { |
| if (applicationContext == null) { |
| CamelContext camelContext = getContext(); |
| if (camelContext instanceof SpringCamelContext) { |
| SpringCamelContext springCamelContext = (SpringCamelContext)camelContext; |
| return springCamelContext.getApplicationContext(); |
| } else { |
| throw new IllegalArgumentException("This SpringBuilder is not being used with a SpringCamelContext and there is no applicationContext property configured"); |
| } |
| } |
| return applicationContext; |
| } |
| |
| /** |
| * Sets the application context to use to lookup beans |
| */ |
| public void setApplicationContext(ApplicationContext applicationContext) { |
| this.applicationContext = applicationContext; |
| } |
| |
| /** |
| * Creates a transaction error handler that will lookup in application context for |
| * an exiting transaction manager. |
| * |
| * @return the created error handler |
| */ |
| public TransactionErrorHandlerBuilder transactionErrorHandler() { |
| return new TransactionErrorHandlerBuilder(); |
| } |
| |
| /** |
| * Creates a transaction error handler. |
| * |
| * @param policy using this transaction policy (eg: required, supports, ...) |
| * @return the created error handler |
| */ |
| public TransactionErrorHandlerBuilder transactionErrorHandler(SpringTransactionPolicy policy) { |
| return transactionErrorHandler(policy.getTransactionTemplate()); |
| } |
| |
| /** |
| * Creates a transaction error handler. |
| * |
| * @param template the spring transaction template |
| * @return the created error handler |
| */ |
| public TransactionErrorHandlerBuilder transactionErrorHandler(TransactionTemplate template) { |
| TransactionErrorHandlerBuilder answer = new TransactionErrorHandlerBuilder(); |
| answer.setTransactionTemplate(template); |
| return answer; |
| } |
| |
| /** |
| * Creates a transaction error handler. |
| * |
| * @param transactionManager the spring transaction manager |
| * @return the created error handler |
| */ |
| public TransactionErrorHandlerBuilder transactionErrorHandler(PlatformTransactionManager transactionManager) { |
| TransactionTemplate template = new TransactionTemplate(transactionManager); |
| return transactionErrorHandler(template); |
| } |
| |
| } |