- CommandLineRunner, ApplicationRunner
- ApplicationStartedEvent 에 핸들러 추가
CommandLineRunner, ApplicationRunner
These interfaces get called just before SpringApplication.run(…) completes.
https://dzone.com/articles/spring-boot-applicationrunner-and-commandlinerunne
23.8 Using the ApplicationRunner or CommandLineRunner https://docs.spring.io/spring-boot/docs/2.1.9.RELEASE/reference/html/boot-features-spring-application.html
import org.springframework.boot.*;
import org.springframework.stereotype.*;
@Component
public class MyBean implements CommandLineRunner {
public void run(String... args) {
// Do something...
}
}ApplicationStartingEvent
It is sent at the start of a run but before any processing, except for the registration of listeners and initializers
23.5 Application Events and Listeners https://docs.spring.io/spring-boot/docs/2.1.9.RELEASE/reference/html/boot-features-spring-application.html
ApplicationStartedEvent
It is sent after the context has been refreshed but before any application and command-line runners have been called.
23.5 Application Events and Listeners https://docs.spring.io/spring-boot/docs/2.1.9.RELEASE/reference/html/boot-features-spring-application.html
PostConstruct
The PostConstruct annotation is used on a method that needs to be executed after dependency injection is done to perform any initialization.
Initializing a managed bean specifies the lifecycle callback method that the CDI framework should call after dependency injection but before the class is put into service.
https://docs.oracle.com/javaee/7/api/javax/annotation/PostConstruct.html
import javax.annotation.PostConstruct;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.List;
import java.util.stream.Collectors;
@Controller
@Transactional
@RequiredArgsConstructor
public class ZoneService {
private final ZoneRepository zoneRepository;
@PostConstruct
public void initZoneData() throws IOException {
if (zoneRepository.count() == 0) {
Resource resource = new ClassPathResource("zone_kr.csv");
List<Zone> zoneList = Files.readAllLines(resource.getFile().toPath(), StandardCharsets.UTF_8).stream()
.map(line-> {
String[] split = line.split(",");
return Zone.builder().city(split[0]).localNameOfCity(split[1]).province(split[2]).build();
}).collect(Collectors.toList());
}
}
}