dependency-injection – 如何将依赖项注入存储库基类

@EnableMongoRepositories(
    repositoryBaseClass = MyBaseClass.class,repositoryFactoryBeanClass = MyRepositoryFactoryBean.class)

在该RepositoryFactoryBean类中,您可以使用普通的依赖注入,因为它是一个Spring Bean,因此,例如,您可以通过构造函数获取SomeBean的实例,如下所示：

public class MyRepositoryFactoryBean<T extends Repository<S,ID>,S,ID extends Serializable> extends MongoRepositoryFactoryBean<T,ID>{

    private final SomeBean bean;

    public MyRepositoryFactoryBean(Class repositoryInterface,SomeBean bean) {
        super(repositoryInterface);
        this.bean = bean;
    }

}

您的RepositoryFactoryBean现在通过覆盖’getFactoryInstance’来创建自定义RepositoryFactory的实例.

@Override
protected RepositoryFactorySupport getFactoryInstance(MongoOperations operations) {
    return new MyMongoRepositoryFactory(operations,bean);
}

这样做时,它可以传递要注入的bean.上面例子中的bean.

此工厂最终实例化您的存储库基类.可能最好的方法是将所有内容委托给现有的工厂类,只需添加依赖项注入混合：

public class MyMongoRepositoryFactory extends MongoRepositoryFactory {

    private final SomeBean bean;

    MyMongoRepositoryFactory(MongoOperations mongoOperations,SomeBean bean) {
        super(mongoOperations);
        this.bean = bean;
    }

    @Override
    protected Object getTargetRepository(RepositoryInformation information) {
        Object targetRepository = super.getTargetRepository(information);
        if (targetRepository instanceof MyBaseClass) {
            ((MyBaseClass) targetRepository).setSomeBean(bean);
        }
        return targetRepository;
    }
}

有一个complete working example on Github.