ngxtm Micronaut Core Standards
Compile-Time DI
@Singleton
public class UserService {
private final UserRepository repository;
private final EventPublisher eventPublisher;
// Constructor injection (preferred)
public UserService(UserRepository repository, EventPublisher eventPublisher) {
this.repository = repository;
this.eventPublisher = eventPublisher;
}
}
// Factory beans
@Factory
public class ClientFactory {
@Singleton
@Named("primary")
public HttpClient primaryClient() {
return HttpClient.create(URI.create("https://api.primary.com"));
}
@Singleton
@Named("fallback")
public HttpClient fallbackClient() {
return HttpClient.create(URI.create("https://api.fallback.com"));
}
}
Configuration
@ConfigurationProperties("app")
public record AppConfig(
String name,
int maxConnections,
DatabaseConfig database
) {
public record DatabaseConfig(
String url,
String username
) {}
}
app:
name: MyMicronautApp
max-connections: 100
database:
url: jdbc:postgresql://localhost/db
username: admin
Controllers
@Controller("/users")
public class UserController {
private final UserService userService;
public UserController(UserService userService) {
this.userService = userService;
}
@Get("/{id}")
public User findById(Long id) {
return userService.findById(id);
}
@Post
@Status(HttpStatus.CREATED)
public User create(@Valid @Body CreateUserRequest request) {
return userService.create(request);
}
}
References
- Compile-Time DI - AOT benefits, introspection