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在这里记录一下在实际开发中,因为对SpringBoot的自动配置不熟悉所导致的一个问题。开始在项目中有RabbitMq客户端的使用,基于SpringBoot的自动装配机制,所有直接在配置文件里配置了RabbitMq连接所使用的配置属性,在这之前都是正常运行的。然后再一次需求开发中,需要连接另一个RabbitMq,发送消息,这时候,就是简单的在系统中创建了一个RabbitMq的客户端实例对象,然后再配置文件中添加了另一套属性配置,服务正常启动运行。但是在后来的运行过程中发现,总是有消息无法投递,报错,这时候发现确实出了问题。
发现问题后,首先查看了出错的消息,发现是之前的mq消息无法投递,经过跟踪,发现投递消息的地址Ip不对,但是配置文件里面的配置属性是正确的,这时候意识到属性配置根本没有起作用,为什么不起作用,是因为属性根本没有被相关实例加载,这时候想到了SpringBoot的自动装配机制,很可能是SpringBoot的自动装配机制导致了之前的配置不起作用了。
由于SpringBoot的自动装配机制,导致我们可以很方便的使用第三方集成功能,但是也导致了我们很容易忽略的一个问题,首先我们看一下RabbitMQ自动装配类:
由于我们添加了新的rabbitMQ属性配置,为了让新的属性配置生效,所以在项目中新增了新的ConnectionFactory配置,由于框架内的RabbitConnectionFactoryCreator生效的条件是@ConditionalOnMissingBean(ConnectionFactory.class),即不存在ConnectionFactory时,默认的配置才会生效,这导致原来的RabbitMQ Template中的配置失效了,只有新增的配置工厂生效了。
@Configuration(proxyBeanMethods = false) @ConditionalOnClass({ RabbitTemplate.class, Channel.class }) @EnableConfigurationProperties(RabbitProperties.class) @Import(RabbitAnnotationDrivenConfiguration.class) public class RabbitAutoConfiguration { @Configuration(proxyBeanMethods = false) @ConditionalOnMissingBean(ConnectionFactory.class) protected static class RabbitConnectionFactoryCreator { @Bean public CachingConnectionFactory rabbitConnectionFactory(RabbitProperties properties, ResourceLoader resourceLoader, ObjectProvider<CredentialsProvider> credentialsProvider, ObjectProvider<CredentialsRefreshService> credentialsRefreshService, ObjectProvider<ConnectionNameStrategy> connectionNameStrategy, ObjectProvider<ConnectionFactoryCustomizer> connectionFactoryCustomizers) throws Exception { com.rabbitmq.client.ConnectionFactory connectionFactory = getRabbitConnectionFactoryBean(properties, resourceLoader, credentialsProvider, credentialsRefreshService).getObject(); connectionFactoryCustomizers.orderedStream() .forEach((customizer) -> customizer.customize(connectionFactory)); CachingConnectionFactory factory = new CachingConnectionFactory(connectionFactory); PropertyMapper map = PropertyMapper.get(); map.from(properties::determineAddresses).to(factory::setAddresses); map.from(properties::getAddressShuffleMode).whenNonNull().to(factory::setAddressShuffleMode); map.from(properties::isPublisherReturns).to(factory::setPublisherReturns); map.from(properties::getPublisherConfirmType).whenNonNull().to(factory::setPublisherConfirmType); RabbitProperties.Cache.Channel channel = properties.getCache().getChannel(); map.from(channel::getSize).whenNonNull().to(factory::setChannelCacheSize); map.from(channel::getCheckoutTimeout).whenNonNull().as(Duration::toMillis) .to(factory::setChannelCheckoutTimeout); RabbitProperties.Cache.Connection connection = properties.getCache().getConnection(); map.from(connection::getMode).whenNonNull().to(factory::setCacheMode); map.from(connection::getSize).whenNonNull().to(factory::setConnectionCacheSize); map.from(connectionNameStrategy::getIfUnique).whenNonNull().to(factory::setConnectionNameStrategy); return factory; } private RabbitConnectionFactoryBean getRabbitConnectionFactoryBean(RabbitProperties properties, ResourceLoader resourceLoader, ObjectProvider<CredentialsProvider> credentialsProvider, ObjectProvider<CredentialsRefreshService> credentialsRefreshService) { RabbitConnectionFactoryBean factory = new RabbitConnectionFactoryBean(); factory.setResourceLoader(resourceLoader); PropertyMapper map = PropertyMapper.get(); map.from(properties::determineHost).whenNonNull().to(factory::setHost); map.from(properties::determinePort).to(factory::setPort); map.from(properties::determineUsername).whenNonNull().to(factory::setUsername); map.from(properties::determinePassword).whenNonNull().to(factory::setPassword); map.from(properties::determineVirtualHost).whenNonNull().to(factory::setVirtualHost); map.from(properties::getRequestedHeartbeat).whenNonNull().asInt(Duration::getSeconds) .to(factory::setRequestedHeartbeat); map.from(properties::getRequestedChannelMax).to(factory::setRequestedChannelMax); RabbitProperties.Ssl ssl = properties.getSsl(); if (ssl.determineEnabled()) { factory.setUseSSL(true); map.from(ssl::getAlgorithm).whenNonNull().to(factory::setSslAlgorithm); map.from(ssl::getKeyStoreType).to(factory::setKeyStoreType); map.from(ssl::getKeyStore).to(factory::setKeyStore); map.from(ssl::getKeyStorePassword).to(factory::setKeyStorePassphrase); map.from(ssl::getKeyStoreAlgorithm).whenNonNull().to(factory::setKeyStoreAlgorithm); map.from(ssl::getTrustStoreType).to(factory::setTrustStoreType); map.from(ssl::getTrustStore).to(factory::setTrustStore); map.from(ssl::getTrustStorePassword).to(factory::setTrustStorePassphrase); map.from(ssl::getTrustStoreAlgorithm).whenNonNull().to(factory::setTrustStoreAlgorithm); map.from(ssl::isValidateServerCertificate) .to((validate) -> factory.setSkipServerCertificateValidation(!validate)); map.from(ssl::getVerifyHostname).to(factory::setEnableHostnameVerification); } map.from(properties::getConnectionTimeout).whenNonNull().asInt(Duration::toMillis) .to(factory::setConnectionTimeout); map.from(properties::getChannelRpcTimeout).whenNonNull().asInt(Duration::toMillis) .to(factory::setChannelRpcTimeout); map.from(credentialsProvider::getIfUnique).whenNonNull().to(factory::setCredentialsProvider); map.from(credentialsRefreshService::getIfUnique).whenNonNull().to(factory::setCredentialsRefreshService); factory.afterPropertiesSet(); return factory; } } @Configuration(proxyBeanMethods = false) @Import(RabbitConnectionFactoryCreator.class) protected static class RabbitTemplateConfiguration { @Bean @ConditionalOnMissingBean public RabbitTemplateConfigurer rabbitTemplateConfigurer(RabbitProperties properties, ObjectProvider<MessageConverter> messageConverter, ObjectProvider<RabbitRetryTemplateCustomizer> retryTemplateCustomizers) { RabbitTemplateConfigurer configurer = new RabbitTemplateConfigurer(); configurer.setMessageConverter(messageConverter.getIfUnique()); configurer .setRetryTemplateCustomizers(retryTemplateCustomizers.orderedStream().collect(Collectors.toList())); configurer.setRabbitProperties(properties); return configurer; } @Bean @ConditionalOnSingleCandidate(ConnectionFactory.class) @ConditionalOnMissingBean(RabbitOperations.class) public RabbitTemplate rabbitTemplate(RabbitTemplateConfigurer configurer, ConnectionFactory connectionFactory) { RabbitTemplate template = new RabbitTemplate(); configurer.configure(template, connectionFactory); return template; } @Bean @ConditionalOnSingleCandidate(ConnectionFactory.class) @ConditionalOnProperty(prefix = "spring.rabbitmq", name = "dynamic", matchIfMissing = true) @ConditionalOnMissingBean public AmqpAdmin amqpAdmin(ConnectionFactory connectionFactory) { return new RabbitAdmin(connectionFactory); } } @Configuration(proxyBeanMethods = false) @ConditionalOnClass(RabbitMessagingTemplate.class) @ConditionalOnMissingBean(RabbitMessagingTemplate.class) @Import(RabbitTemplateConfiguration.class) protected static class MessagingTemplateConfiguration { @Bean @ConditionalOnSingleCandidate(RabbitTemplate.class) public RabbitMessagingTemplate rabbitMessagingTemplate(RabbitTemplate rabbitTemplate) { return new RabbitMessagingTemplate(rabbitTemplate); } } }
为了使两个配置都生效,我们可以在配置中配置两套RabbitMQ ConnectionFactory 和Rabbit Template,这两就会有两个实例同时生效了。
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