Erstellen benutzerdefinierter Meta-Annotations-Qualifier für typsichere Bean-Auflösung

@Target({ElementType.FIELD, ElementType.PARAMETER, ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Qualifier
public @interface StorageBackend {
    Medium medium();
    
    enum Medium {
        RELATIONAL_PRIMARY,
        ANALYTICS_REPLICA
    }
}
 
@Service
@StorageBackend(medium = StorageBackend.Medium.ANALYTICS_REPLICA)
class AnalyticsQueryService implements QueryService {}
 
@Component
class MetricsDashboard {
    private final QueryService queryService;
 
    public MetricsDashboard(@StorageBackend(medium = StorageBackend.Medium.ANALYTICS_REPLICA) QueryService queryService) {
        this.queryService = queryService;
    }
}