वसंत में इंजेक्शन संग्रह की कुछ सूक्ष्मताएं

पृष्ठभूमि

परिदृश्य

public class Hero {
}

@Component
public class Rambo extends Hero {

    @Override
    public String toString() {
        return "Rambo";
    }
}

@Component
public class Terminator extends Hero {

    @Override
    public String toString() {
        return "Terminator";
    }
}


@Component
public class Gandalf extends Hero {
    @Override
    public String toString() {
        return "Gandalf";
    }
}

इंजेक्शन सूची

@Service
@Getter
public class ActionHeroesService {
    @Autowired
    List<Hero> actionHeroes;
}

@Configuration
public class HeroesConfig {

    @Bean
    public List<Hero> action() {
        List<Hero> result = new ArrayList<>();
        result.add(new Terminator());
        result.add(new Rambo());
        return result;
    }
}

विकल्प 1. क्रच

@Configuration
public class HeroesConfig {

    @Bean
    public ArrayList<Hero> action() {
        ArrayList<Hero> result = new ArrayList<>();
        result.add(new Terminator());
        result.add(new Rambo());
        return result;
    }
}

@Service
@Getter
public class ActionHeroesService {
    @Autowired
    ArrayList<Hero> actionHeroes;
}

विकल्प 2. अधिक सही

@Service
@Getter
public class ActionHeroesService {
    @Autowired
    @Qualifier("action")
    List<Hero> actionHeroes;
}

इंजेक्शन के नक्शे

@Service
@Getter
public class MainCharactersService {
    @Autowired
    Map<String, Hero> mainCharactersByFilmName;
}

@Configuration
public class HeroesConfig {

    @Bean
    public Map<String, Hero> mainCharactersByFilmName() {
        Map<String, Hero> result = new HashMap<>();

        result.put("rambo", new Rambo());
        result.put("terminator", new Terminator());
        result.put("LOTR", new Gandalf());

        return result;
    }
}

विकल्प 1. क्रच

@Service
@Getter
public class MainCharactersService {
    @Autowired
    HashMap<String, Hero> mainCharactersByFilmName;
}


@Configuration
public class HeroesConfig {

    @Bean
    public HashMap<String, Hero> mainCharactersByFilmName() {
        HashMap<String, Hero> result = new HashMap<>();

        result.put("rambo", new Rambo());
        result.put("terminator", new Terminator());
        result.put("LOTR", new Gandalf());

        return result;
    }
}

विकल्प 2. अधिक सही

@Service
@Getter
public class MainCharactersService {
    @Autowired
    @Qualifier("mainCharactersByFilmName")
    Map<String, Hero> mainCharactersByFilmName;
}