org.springframework.amqp.rabbit.config.StatelessRetryOperationsInterceptorFactoryBean.java Source code

Introduction

Here is the source code for org.springframework.amqp.rabbit.config.StatelessRetryOperationsInterceptorFactoryBean.java

Source

/*
 * Copyright 2002-2010 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.MethodInvocationRecoverer;
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.
 *
 * @see RetryOperations#execute(org.springframework.retry.RetryCallback, org.springframework.retry.RecoveryCallback)
 *
 * @author Dave Syer
 *
 */
public class StatelessRetryOperationsInterceptorFactoryBean extends AbstractRetryOperationsInterceptorFactoryBean {

    private static Log logger = LogFactory.getLog(StatelessRetryOperationsInterceptorFactoryBean.class);

    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(new MethodInvocationRecoverer<Void>() {
            public Void recover(Object[] args, Throwable 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;

    }

    public Class<?> getObjectType() {
        return RetryOperationsInterceptor.class;
    }

    public boolean isSingleton() {
        return true;
    }

}