/**
* 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 $Revision: 949922 $
*/
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
*/
@SuppressWarnings("unchecked")
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);
}
}