spring笔记-repository接口自动注册解析

以下以MongoRepository为例

1.基本原理

根据之前解析mybatis一样,https://www.jianshu.com/p/41b90892c9d9
推敲下来,技术层面肯定是采用的AOP技术,我们先来验证看结果

1.生成的代理对象

是一个跟SimpleMongoRepository相关的对象

2.RepositoryFactoryBeanSupport

在EnableMongoRepositories注解中默认使用了MongoRepositoryFactoryBean,
我们再来看RepositoryFactoryBeanSupport内部的实现,
RepositoryFactoryBeanSupport是一个FactoryBean,其getObject方法调用了initAndReturn方法,其内部调用了RepositoryFactorySupport的getRepository方法

3.RepositoryFactoryBeanSupport

再来看一下RepositoryFactorySupport的getRepository方法,

关键信息来了getTargetRepository方法

    public  T getRepository(Class repositoryInterface, Object customImplementation) {

        RepositoryMetadata metadata = getRepositoryMetadata(repositoryInterface);
        Class customImplementationClass = null == customImplementation ? null : customImplementation.getClass();
        RepositoryInformation information = getRepositoryInformation(metadata, customImplementationClass);

        validate(information, customImplementation);

        Object target = getTargetRepository(information);

        // Create proxy
        ProxyFactory result = new ProxyFactory();
        result.setTarget(target);
        result.setInterfaces(new Class[] { repositoryInterface, Repository.class });

        if (TRANSACTION_PROXY_TYPE != null) {
            result.addInterface(TRANSACTION_PROXY_TYPE);
        }

        for (RepositoryProxyPostProcessor processor : postProcessors) {
            processor.postProcess(result, information);
        }

        if (IS_JAVA_8) {
            result.addAdvice(new DefaultMethodInvokingMethodInterceptor());
        }

        result.addAdvice(new QueryExecutorMethodInterceptor(information, customImplementation, target));

        return (T) result.getProxy(classLoader);
    }

以下是MongoRepositoryFactory重写的getTargetRepository方法

    @Override
    @SuppressWarnings({ "rawtypes", "unchecked" })
    protected Object getTargetRepository(RepositoryMetadata metadata) {

        Class repositoryInterface = metadata.getRepositoryInterface();
        MongoEntityInformation entityInformation = getEntityInformation(metadata.getDomainType());

        if (isQueryDslRepository(repositoryInterface)) {
            return new QueryDslMongoRepository(entityInformation, mongoOperations);
        } else {
            return new SimpleMongoRepository(entityInformation, mongoOperations);
        }
    }

到此为止基本上对repository接口自动注册解析有一个基本的概念了,当然还没这么简单.还有一系列的注册流程,即如何把MongoRepositoryFactoryBean自动注册到sping容器里面去.

4.注册流程

注册的流程要从注解EnableMongoRepositories开始跟进分析

下图对MongoRepositoryFactoryBean相关的BeanDefinition注册做了解析

到此为止,repository接口自动注册解析基本上揭开了面纱,其中思路还是值得学习的

参考:
https://blog.csdn.net/gaolu/article/details/53415420