Wiring Repository interfaces in service layer dynamically - spring

Question

The Service class and my repository classes in my spring MVC set up are something like this -
public class ObjectServiceImpl implements ObjectService {
#Autowired
Temp1Repo temp1Repo;
#Autowired
Temp2Repo temp2Repo;
...
}
public interface Temp1Repo extends CrudRepository<Temp1, Integer> {
}
public interface Temp2Repo extends CrudRepository<Temp2, Integer> {
}
Now, in my service class, i am getting a object of a type Temp1, I have to call temp1Repo.save(). If I get an object of Temp2, I have to call temp2Repo.save() and so on...
How do i achieve this?

Answer 1

Seems fairly simple to just have an if statement:
if(object instanceof Temp1) {
temp1Repo.save((Temp1) object);
} else if(object instanceof Temp2) {
temp2Repo.save((Temp2) object);
}
Or perhaps you are looking for a more generic way?

Answer 2

I suppose that you want to regroup all repositories in one. Something like
#SuppressWarnings("rawtypes")
public class ObjectServiceImpl {
#Autowired
private CrudRepository[] repositories;
private Map<Class<?>, CrudRepository> repositoryMap = new HashMap<Class<?>, CrudRepository>();
#PostConstruct
public void init() {
for (CrudRepository r : repositories)
repositoryMap.put(getType(r), r);
}
private Class<?> getType(CrudRepository repository) {
Type[] types = repository.getClass().getGenericInterfaces();
for (Type t : types) {
if (t instanceof ParameterizedType)
return (Class<?>) ((ParameterizedType) t).getActualTypeArguments()[0];
}
throw new IllegalStateException("Check repositories...");
}
public void save(Object entity) {
repositoryMap.get(entity.getClass()).save(entity);
}
public <T> T get(Object id, Class<T> clazz) {
return repositoryMap.get(clazz).findOne(id);
}
....
}
Consider to use EntityManager directly, but could be useful anyway...

Answer 3

Following the code you wrote, Spring will rise an exception at startup time if any injection is missing.
What you want to do is a dynamic Module load, depending on a condition you omitted within your question.
You probably have to use XML configuration style and create a by condition spring context and load the correct one to be used.
Cheers