leelee.log
[Spring] Bean LifeCycle 본문
모든 포스팅에서 Bean 얘기를 하고 있는 느낌인데 오늘은 좀 심화된 Bean의 얘기를 할 것이다. Spring은 그냥 자바 객체를 쓰지 왜 Bean이라고 하는 별도의 개념을 또 만들어냈을까? 왜냐하면 의존성 주입(DI)가 하고 싶고, 스코프(객체의 활동 범위 정도라고 이해 했다)를 관리하고 싶었기 때문이다. Request를 물어오는 AController 객체가 하나면 충분하지 꼭 두 개, 세 개 여러 개 일 필요가 있을까? 그럴 필요 없다. 또 db와 연결을 하는 repository 객체는 하나 만드는데 꽤 비용이 든다. Spring은 이렇게 꼭 하나만 만들어도 되는 객체면 하나만 만들어서 쓰고 싶어 한다. 별 거 안 해도 무거운 자바에게는 필수적인 선택이었을 것이다. 그래서 단일 스코프로 작동하기 위해 Singleton 패턴을 도입했다. 참고로 Singleton이 아닌 일반 자바같이 객체를 만드는 방법은 Prototype이라고 한다.
이렇게 만들어져서 Spring이 관리를 해주는 Bean에도 객체 주기가 있다. 나는 주로 Spring 프로젝트를 jar 파일로 만들어서 배포하니 여기서도 jar을 사용해서 설명을 하도록 하겠다. Bean으로 등록된 객체는 jar 파일을 실행 시켰을 때 (서버가 살아날 때) 만들어져 IoC에 담기고, 내가 일부러 빈을 따로 없애는 코드를 사용하지 않았다면 jar 파일 실행을 취소했을 때 (서버를 내릴 때) 없어진다. 밑에 Bean 겍체주기를 보여주는 그림을 한 번 보자.
1. annotation
@PostConstruct
-막 bean 객체가 초기화가 되었을 때 호출이 된다. Cilent에게 호출되기 전에 서버에서 미리 준비를 해야 할 부분이 있다면 @PostConstruct를 사용하여 객체가 초기화 되자마자 일을 시킬 수 있다. 나는 DB와 관련된 Bean에서 자주 사용하는데 미리 DB에서 데이터를 가져와서 서버에 캐싱을 해둬서 Client가 정보를 요청하면 빠르게 줄 수 있는 형식으로 사용했다. 자주 바뀌는 대용량의 데이터에서 보다는 자주 바뀌지 않는 메타데이터를 캐싱하는데 쓰기 좋았다.
@PreDestroy
-Bean이 IoC에서 제거되기 직전에 호출된다. 한 번 도 Bean을 의도적으로 죽여본적이 없어서 어디에 사용할지 감이 잘 안 왔었는데 DB 커넥션등 유지비용이 많이 드는 작업 같은 경우 서버를 내리지는 않고 Bean만 죽여야 하는 상황이라면 Release 해주는게 서버의 성능 향상에 좋을 것 이다.
2. BeanPostProcessor
postProcessBeforeInitialization, postProcessAfterInitialization
-postProcessBeforeInitialization의 경우에는 Bean이 정말 '만들어지기만' 했을 때 호출이 된다고 한다. 제일 처음으로 Bean에 관련된 작업을 할 수 있는 메소드인듯 하다. 두 메소드를 사용해서 예제를 한 번 만들어 봤는데 @PostConstruct나 @PreDestroy처럼 딱 한 번 씩만 호출이 될 줄 알았으나 stck trace를 보니 굉장히 자주 호출이 되었다. 아무래도 해당 Bean에 관련된 다른 모든 Bean들에 대해서도 호출이 되는게 아닌가 싶다.
stack trace 확인하기 (▽)
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.4.RELEASE)
2020-03-13 11:05:18.396 INFO 16892 --- [ restartedMain] com.example.tstory.TStoryApplication : Starting TStoryApplication on DESKTOP-HR4H108 with PID 16892 (C:\ideaprojects\self\t-story\out\production\classes started by absin in C:\ideaprojects\self\t-story)
2020-03-13 11:05:18.410 INFO 16892 --- [ restartedMain] com.example.tstory.TStoryApplication : No active profile set, falling back to default profiles: default
2020-03-13 11:05:18.505 INFO 16892 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2020-03-13 11:05:18.505 INFO 16892 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2020-03-13 11:05:19.720 INFO 16892 --- [ restartedMain] com.example.tstory.service.TestService : TestService Bean은 지금 막 태어났습니다
2020-03-13 11:05:19.729 INFO 16892 --- [ restartedMain] com.example.tstory.service.TestService : (TestService.postProcessBeforeInitialization) called
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Disconnected from the target VM, address: '127.0.0.1:53825', transport: 'socket'
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2020-03-13 11:05:27.321 INFO 16892 --- [extShutdownHook] com.example.tstory.service.TestService : TestService Bean은 이제 죽은 목숨 입니다.
Process finished with exit code 130
3. InitializingBean, DisposableBean
-@PostConstruct, @PreDestroy와 비슷한 동작을 한다. interface들이라서 상속을 해주고 afterPropertiesSet와 destroy 메소드를 오버라이드 하면 된다. 다중 상속을 하면 둘 다 사용을 할 수 있다. 그런데 이 interface들은 Spring에서만 제공해주는 interface라서 Spring에 의존적이라고 한다. 반면 @PostConstruct와 @PreDestroy는 Java가 전역적으로 제공하는 어노테이션이라 spring 의존성은 없다.
개인적인 견해이지만 Bean 생성, 파괴 조작을 할 때 제일 좋은 방법은 @PostContruct와 @PreDestroy를 사용하는게 아닐까 싶다. 따로 interface를 선언할 필요도 없고, Spring에 의존적이지 않으면서 그냥 annotation만 써주면 된다. 그리고 작동 원리도 어렵지 않고 직관적이다. BeanLife Cycle과 연관된 기능들을 찾아보고 다녔더니 나처럼 단순DB 캐싱을 위한 선호출 말고도 멋진 방법으로 사용하는 예제가 많았어서 다음번에는 Lazy Initalization에 다뤄볼 것이다.
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