[英]Inject generic service bean
I have some highly repetitive code that i decided to move into an abstract class, for the sake of simplicity let's assume that the class looks like: 我有一些高度重复的代码,我决定进入一个抽象类,为简单起见,让我们假设该类看起来像:
class AbstractEntityService<E extends MyEntity, REPO extends MyRepository<E>> {
@Autowired
private REPO repo;
... // methods
}
and I have about 10 separate classes that need this functionality so i have 而且我有大约10个单独的类需要此功能,所以我有
@Service
class MyService1 extends AbstractEntityService<MyEntity1, MyEntity1Repo> {}
@Service
class MyService2 extends AbstractEntityService<MyEntity2, MyEntity2Repo> {}
...
MyService1 ... MyService10 don't really do anything other than to cement the types for spring's autodetection to work. MyService1 ... MyService10除了巩固用于弹簧自动检测的类型之外,实际上并没有做任何其他事情。
I'm wondering if i can get away without defining them and injecting 我想知道我是否可以不定义它们并注入
@Autowired
private AbstractEntityService<MyEntity2, MyEntity2Repo> myEntity2Repo;
directly without defining the classes myself. 直接定义自己的类。
No, I'm pretty sure you cannot. 不,我敢肯定你不能。
I think the best you can do is if you create the beans yourself in a config file. 我认为最好的方法是在配置文件中自行创建bean。
import javax.inject.Inject;
import org.springframework.context.annotation.Bean;
@org.springframework.context.annotation.Configuration
public MyConfic {
@Inject MyEntity1Repo myEntity1Repo;
@Inject MyEntity2Repo myEntity2Repo;
@Bean(name="myEntity1Service")
AbstractEntityService<MyEntity1, MyEntity1Repo> myEntity2Service(){
return new AbstractEntityService<> myEntity1Service( myEntity2Repo );
}
@Bean(name="myEntity2Service")
AbstractEntityService<MyEntity2, MyEntity2Repo> myEntity2Service(){
return new AbstractEntityService<> myEntity2Service( myEntity2Repo );
}
}
At least this way you don't have to create a separate subclass per entity. 至少通过这种方式,您不必为每个实体创建单独的子类。
Mind you, now you cannot do injection by type since after erasure your myEnity1Service
you will have the same type as myEnity2Service
: AbstractEntityService
. 你要知道,现在你不能因为你的力擦除后类型做注射
myEnity1Service
你将有相同的类型myEnity2Service
: AbstractEntityService
。 Using something like 使用类似
@Inject @Named("myEntity2Service" )
AbstractEntityService<MyEntity2, MyEntity2Repo> myEntity2Service;
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