弹簧。动态依赖注入 [英] Spring. Dynamic dependency injection

问题描述

我有一个泛型类A

  public class A< T，DAO extends JpaRepository<？，？>>> 
 {
 
 @Autowired 
保护DAO daoObject; 
 
 ...... 
  

在那里我试图注入如果我只有一个实现注入对象（JpaRepository）的实现，那么没有问题，但如果我有更多的注入对象（JpaRepository）那么Spring就不知道它要注入哪个对象并引发异常。

现在的问题是：如何根据通用信息来激活，注入正确的对象？

谢谢。

  public interface IRegisteredUserDAO扩展JpaRepository< ; RegisteredUser，String> {
 
} 
 
 
公共接口IMailLogDao扩展JpaRepository< MailLog，Long> {
 
 findByTo（String to）; 
} 
  

我使用它

  public class RegisteredUserVM extends YBTableViewModel< RegisteredUser，IRegisteredUserDAO> 
 {
  

更新：

  public class MailLogVM extends YBTableViewModel< MailLog，IMailLogDao> 
 {
 
} 
  

解决方案

你应该可以使用最新的Spring 4 RC1来做到这一点。之前的版本根本不支持通用注入。有关详细信息，请参阅此故事单和相关提交。

I have the following problem.

I have a generic class A

public class A<T, DAO extends JpaRepository<?, ?>>
{    

    @Autowired
    protected DAO daoObject;

    ......

and there I am trying inject a genreic DAO-object of the JpaRepository-type.

If I have only one implemetation of injected object(of JpaRepository), then there is no problem, but if I have more then one, then spring doesn't know which object it is to inject and throws an exception.

The question is: How can I dynamish based on generic information, inject the correct object?

Thank you.

public interface IRegisteredUserDAO extends JpaRepository<RegisteredUser, String> {

}


public interface IMailLogDao extends JpaRepository<MailLog, Long> {

   findByTo(String to);
}

and i used it so

public class RegisteredUserVM extends YBTableViewModel<RegisteredUser, IRegisteredUserDAO>
{

UPDATE:

public class MailLogVM extends YBTableViewModel<MailLog, IMailLogDao>
{    

}

解决方案

You should be able to do this using the latest Spring 4 RC1. Versions before that do not support generic injection at all. See this ticket and related commits for details.

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