Spring-data-mongodb拦截查询和注入谓词或规范

Question

环境:

spring-data-mongo:1.7.0.RC1 mongo-java-driver:3.2.2

文献:

@Document(collection = "products")
public class Product  {

    @Id
    private String sid;

    private String name;

    private Long vendor;

    (...)
}

库:

public interface ProductRepository extends MongoRepository<Product, String> {

    Product findByName(String productName);

}

我的目标是拦截对Product集合执行的任何查询,并添加谓词或规范,而无需修改存储库或需要实现方法findByNameAndBelongsToVendorList.

我需要这个拦截器或aspectJ,因为我有多个方法,如:

Page<Product> findAll(Pageable page);

List<Product> findByCategory(String category, Pageable pageRequest);

(...)

目标

findByName // perform a filter by name (explicit) 
           // and a filter by vendor (injected via inteceptor or aspecJ)

避免这样做

@Repository
public class ProductRepositoryCustomImpl implements ProductRepositoryCustom {

    @Autowired
    private MongoTemplate template;

    public Product findByNameAndBelongsToVendorList(String name, List<Long> vendors, Pageable pageRequest) {

        Criteria criteriaVendor = Criteria.where("vendors").in(vendors);
        Query query = new Query(criteriaVendor);
        query.with(pageRequest);

        return template.findOne(query, Product.class);
    }
}

Answer 1

方面应该能解决问题。

@Aspect
public class YourAspect {

  @Autowired
  private MongoTemplate template;

  @Pointcut("execution(public * findByName(..))")
    private void findByName() {
  }

  @Pointcut("within(com.leonel.repository.ProductRepository)")
  private void repository() {
  }

  @Around("repository() && findByName()")
  public Object doAround(ProceedingJoinPoint pjp) throws Throwable {
      Object[] args = pjp.getArgs();
      String name = (String) args[0];

      Criteria newCriteria = YOUR NEW LOGIC HERE;
      Query query = new Query(newCriteria);

      return template.find(query, Your.class);
  }

不过，我建议不要这样做，因为它给您的代码带来了一些魔力，并且操作查询不应该是方面的问题。您希望避免在存储库中使用多个查找方法的原因是什么？