RedisMessageListenerContainer是Spring Data Redis提供的一个容器类，为Redis监听器提供异步处理能力，处理低级别消息、转换Redis的消息通道，它通常与MessageListenerAdapter和自定义的消息监听器一起使用。

一、RedisMessageListenerContainer容器类初始化

	private void initMessageListenerContainer() {

		this.messageListenerContainer = new RedisMessageListenerContainer();
		this.messageListenerContainer.setConnectionFactory(((RedisTemplate<?, ?>) redisOps).getConnectionFactory());
		this.messageListenerContainer.afterPropertiesSet();
		this.messageListenerContainer.start();
	}

org.springframework.data.redis.core.RedisKeyValueAdapter适配器类会在构造函数或afterPropertiesSet回调方法中调用initMessageListenerContainer初始化方法。

二、RedisKeyValueAdapter适配器类

	private static AbstractBeanDefinition createRedisKeyValueAdapter(RepositoryConfigurationSource configuration) {

		BeanDefinitionBuilder builder = BeanDefinitionBuilder.rootBeanDefinition(RedisKeyValueAdapter.class) //
				.addConstructorArgReference(configuration.getRequiredAttribute("redisTemplateRef", String.class)) //
				.addConstructorArgReference(REDIS_CONVERTER_BEAN_NAME) //
				.addPropertyValue("enableKeyspaceEvents",
						configuration.getRequiredAttribute("enableKeyspaceEvents", EnableKeyspaceEvents.class)) //
				.addPropertyValue("keyspaceNotificationsConfigParameter",
						configuration.getAttribute("keyspaceNotificationsConfigParameter", String.class).orElse("")) //
				.addPropertyValue("shadowCopy", configuration.getRequiredAttribute("shadowCopy", ShadowCopy.class));

		configuration.getAttribute("messageListenerContainerRef")
				.ifPresent(it -> builder.addPropertyReference("messageListenerContainer", it));

		return builder.getBeanDefinition();
	}

org.springframework.data.redis.repository.configuration.RedisRepositoryConfigurationExtension类会在registerBeansForRoot方法中将RedisKeyValueAdapter对象定义成AbstractBeanDefinition对象注册到BeanDefinitionRegistry中。

三、RedisRepositoryConfigurationExtension对象初始化

	@Override
	protected RepositoryConfigurationExtension getRepositoryConfigurationExtension() {
		return new RedisRepositoryConfigurationExtension();
	}

RedisRepositoriesRegistrar类中定义类RedisRepositoryConfigurationExtension对象的实例化方法，并且被RedisRepositoriesRegistrar的抽象父类AbstractRepositoryConfigurationSourceSupport中的registerBeanDefinitions方法调用。

AbstractRepositoryConfigurationSourceSupport#registerBeanDefinitions方法：

@Override
public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry,
       BeanNameGenerator importBeanNameGenerator) {
    RepositoryConfigurationDelegate delegate = new RepositoryConfigurationDelegate(
          getConfigurationSource(registry, importBeanNameGenerator), this.resourceLoader, this.environment);
    delegate.registerRepositoriesIn(registry, getRepositoryConfigurationExtension());
}

上述registerBeanDefinitions方法是被ConfigurationClassBeanDefinitionReader#loadBeanDefinitionsFromRegistrars方法所调用，此类是spring初始化bean及相关类的核心。

	private void loadBeanDefinitionsFromRegistrars(Map<ImportBeanDefinitionRegistrar, AnnotationMetadata> registrars) {
		registrars.forEach((registrar, metadata) ->
				registrar.registerBeanDefinitions(metadata, this.registry, this.importBeanNameGenerator));
	}

四、RedisMessageListenerContainer容器初始化相关默认值

class RedisRepositoriesRegistrar extends AbstractRepositoryConfigurationSourceSupport {

	@Override
	protected Class<? extends Annotation> getAnnotation() {
		return EnableRedisRepositories.class;
	}

	@Override
	protected Class<?> getConfiguration() {
		return EnableRedisRepositoriesConfiguration.class;
	}

	@Override
	protected RepositoryConfigurationExtension getRepositoryConfigurationExtension() {
		return new RedisRepositoryConfigurationExtension();
	}

	@EnableRedisRepositories
	private static final class EnableRedisRepositoriesConfiguration {

	}

}

RedisRepositoriesRegistrar类是RedisMessageListenerContainer监听器容器类的初始化起点类，会读取@EnableRedisRepositories注解的属性配置，如果项目中未显式使用此注解则读取默认值，如：redisTemplateRef属性默认引用别名为redisTemplate的模板类。

五、如何开启Spring Data Redis Repositories仓储

• 方案一：

/**
* 通过在配置类上添加次注解
**/
@EnableRedisRepositories

• 方案二：

/**
* 通过spring.data.redis.repositories.enabled配置开关
**/
@AutoConfiguration(after = RedisAutoConfiguration.class)
@ConditionalOnClass(EnableRedisRepositories.class)
@ConditionalOnBean(RedisConnectionFactory.class)
@ConditionalOnProperty(prefix = "spring.data.redis.repositories", name = "enabled", havingValue = "true",
		matchIfMissing = true)
@ConditionalOnMissingBean(RedisRepositoryFactoryBean.class)
@Import(RedisRepositoriesRegistrar.class)
public class RedisRepositoriesAutoConfiguration {

}

开源SDK：https://github.com/mingyang66/spring-parent