DDD Domain Service와 Application Serivce의 차이가 뭘까? DEV / WEB
2023-03-11 posted by sang12
도메인 주도 설계 5장 Service (에릭에반스)
책에서 나온 예시
계좌 잔고가 일정 금액 아래로 떨어지면 고객에게 이메일을 발송하는 에플리케이션이 있다.
-> 계좌이체를 해서 잔고가 일정 금액이상 떨어지면 이메일을 발송하는것을 말하는듯…
응용 계층 ( Application Service ) 의 책임
자금 이체 응용 서비스
입력 내용의 암호화
이체 처리를 위한 도메인 서비스로의 메시지 전송
이체 확인 대기
인프라스트럭처 서비스를 이용한 통지 결정
도메인 서비스의 책임
자금 이체 도메인 서비스
금액 인출/입금에 필요한 Account(계좌)와 Ledger(원장) 객체 간의 상호작용
이체 결과 확인 정보 제공(이체 수락 여부 등)
인프라 스트럭처
통지 서비스
애플리케이션에서 지정한 곳으로 이메일이나 우편 등을 보냄
여기서 도메인 서비스가 왜 필요할까?
도메인 개념 가운데 객체로는 모델에 어울리지 않는 것이 있다. 필요한 도메인 기능을 Entity나 Value에서 억지로 맡게 하면 모델에 기반을 둔 객체의 정의가 왜곡되거나, 또는 무의미하고 인위적으로 만들어진 객체가 추가될 것이다.
위의 예시에서 보면 도메인 서비스에서는 Account(계좌)와 Ledger(원장) 객체에 접근을 해야 자금 이체를 할 수 있다. 결국 도메인 객체 안에서 혼자 해결될 수 없는데 도메인과 연관된 서비스의 경우 도메인 서비스에 설계가 되야 한다. 예제에서는 입력 내용을 암호화 하거나 메세지를 전송하는 것은 도메인 업무 규칙과는 상관이 없다.
도메인 서비스의 특징
연산이 원래부터 Entity나 Value Object의 일부를 구성하는 것이 아니라 도메인 개념과 관련돼 있다.
-> 해석….ㅠㅠ 도메인으로 처리할 수 없지만 도메인 개념과 관련되 있다는 이야기 인듯..?인터페이스가 도메인 모델의 외적 요소의 측면에서 정의된다.
-> 해석….ㅠㅠ 요것도 도메인 모델에서 처리할 수 없다는 말인 거 같다.연산이 상태를 갖지 않는다
도메인 서비스를 사용하면 뭐가 좋을까?
세밀한 도메인 객체 (세밀한 도메인 객체가 뭔가요 대체)에서 지식이 새어 나오게 해서 도메인 객체의 행위를 조정하는 응용 계층을 흘러가게 할 수 있다.
→ 응용 계층(Application Service)에 도메인 규칙들이 스며드는 것을 말하는 듯
도메인 서비스를 적절히 도입하면 계층 간의 경계를 선명하게 하는 데 도움될 수 있다.
→ 응용 계층에 도메인 규칙들이 스며드는 것을 막을 수 있어서 계층 간의 경계를 더욱 선명하게 하는데 도움이 될 수 있다.
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답글| 1 | |
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답글| 1 | |
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답글| 1 | |
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답글| 1 | |
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답글| 1 | |
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답글| 1 | |
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답글| 1 | |
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답글| 1 | |
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답글| 1 | |
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답글| 1 | |
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답글| 1 | |
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답글| 1ihMV3OF6 | |
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답글| 1 | |
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답글| -1 OR 2+958-958-1=0+0+0+1 -- | |
| 2024-11-09 09:43:08 |
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답글| -1 OR 2+60-60-1=0+0+0+1 | |
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답글| -1' OR 2+886-886-1=0+0+0+1 -- | |
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답글| -1' OR 2+70-70-1=0+0+0+1 or 'zrazD9ft'=' | |
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답글| -1" OR 2+541-541-1=0+0+0+1 -- | |
| 2024-11-09 09:43:08 |
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답글| 1*if(now()=sysdate(),sleep(15),0) | |
| 2024-11-09 09:43:08 |
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답글| 10'XOR(1*if(now()=sysdate(),sleep(15),0))XOR'Z | |
| 2024-11-09 09:43:09 |
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답글| 10"XOR(1*if(now()=sysdate(),sleep(15),0))XOR"Z | |
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답글| 1-1; waitfor delay '0:0:15' -- | |
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답글| 1-1); waitfor delay '0:0:15' -- | |
| 2024-11-09 09:43:09 |
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답글| 1-1 waitfor delay '0:0:15' -- | |
| 2024-11-09 09:43:09 |
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답글| 1Nvc66WNS'; waitfor delay '0:0:15' -- | |
| 2024-11-09 09:43:09 |
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답글| 1-1 OR 575=(SELECT 575 FROM PG_SLEEP(15))-- | |
| 2024-11-09 09:43:09 |
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| 2024-11-09 09:43:09 |
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| 2024-11-09 09:43:10 |
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답글| 1Wyht74UY' OR 144=(SELECT 144 FROM PG_SLEEP(15))-- | |
| 2024-11-09 09:43:10 |
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| 2024-11-09 09:43:10 |
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| 2024-11-09 09:43:10 |
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답글| 1*DBMS_PIPE.RECEIVE_MESSAGE(CHR(99)||CHR(99)||CHR(99),15) | |
| 2024-11-09 09:43:10 |
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답글| 1 | |
| 2024-11-09 09:43:10 |
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답글| 1'" | |
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| 2024-11-09 09:43:10 |
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답글| @@k8Yur | |
| 2024-11-09 09:43:11 |
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답글| 1 | |
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