/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed 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.springframework.amqp.rabbit.config;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.retry.MessageRecoverer;
import org.springframework.retry.RetryOperations;
import org.springframework.retry.interceptor.RetryOperationsInterceptor;
import org.springframework.retry.support.RetryTemplate;
/**
* Convenient factory bean for creating a stateless retry interceptor for use in a message listener container, giving
* you a large amount of control over the behaviour of a container when a listener fails. To control the number of retry
* attempt or the backoff in between attempts, supply a customized {@link RetryTemplate}. Stateless retry is appropriate
* if your listener can be called repeatedly between failures with no side effects. The semantics of stateless retry
* mean that a listener exception is not propagated to the container until the retry attempts are exhausted. When the
* retry attempts are exhausted it can be processed using a {@link MessageRecoverer} if one is provided, in the same
* transaction (in which case no exception is propagated). If a recoverer is not provided the exception will be
* propagated and the message may be redelivered if the channel is transactional.
*
* @author Dave Syer
* @author Gary Russell
*
* @see RetryOperations#execute(org.springframework.retry.RetryCallback, org.springframework.retry.RecoveryCallback)
*/
public class StatelessRetryOperationsInterceptorFactoryBean extends AbstractRetryOperationsInterceptorFactoryBean {
private static Log logger = LogFactory.getLog(StatelessRetryOperationsInterceptorFactoryBean.class);
@Override
public RetryOperationsInterceptor getObject() {
RetryOperationsInterceptor retryInterceptor = new RetryOperationsInterceptor();
RetryOperations retryTemplate = getRetryOperations();
if (retryTemplate == null) {
retryTemplate = new RetryTemplate();
}
retryInterceptor.setRetryOperations(retryTemplate);
final MessageRecoverer messageRecoverer = getMessageRecoverer();
retryInterceptor.setRecoverer((args, cause) -> {
Message message = (Message) args[1];
if (messageRecoverer == null) {
logger.warn("Message dropped on recovery: " + message, cause);
}
else {
messageRecoverer.recover(message, cause);
}
return null;
});
return retryInterceptor;
}
@Override
public Class<?> getObjectType() {
return RetryOperationsInterceptor.class;
}
@Override
public boolean isSingleton() {
return true;
}
}