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# @Configuration과 바이트코드 조작의 마법

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@Configuration\npublic class AppConfig {\n\n  @Bean\n  public MemberService memberService() {\n    System.out.println(\"call AppConfig.memberService\");\n    return new MemberServiceImpl(memberRepository());\n  }\n\n  @Bean\n  public OrderService orderService() {\n    System.out.println(\"call AppConfig.orderService\");\n    return new OrderServiceImpl(memberRepository());\n  }\n \n  @Bean\n  public MemberRepository memberRepository() {\n    System.out.println(\"call AppConfig.memberRepository\");\n    return new MemoryMemberRepository();\n  }\n}
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# AppConfig@CGLIB 예상 코드

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@Bean\npublic DataService dataService() {\n  if(dataService 가 이미 스프링 컨테이너에 등록되어 있으면)\n    return 스프링 컨테이너에서 찾아서 변환;\n  else {\n    기존 로직을 호출하여 dataService를 생성하고 스프링 컨테이너에 등록\n    return 반환\n  }\n}
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