RoomTag 엔티티 동등성 및 해시 코드 메서드 수정 #3
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✏️ Tip: You can customize this high-level summary in your review settings. WalkthroughRoomMusicTag 엔티티의 동등성 계약이 변경되었습니다. equals(Object)에서 id 대신 room과 tag 필드를 비교하도록 변경되었고, hashCode()는 room과 tag 기반 해시를 반환하도록 수정되었습니다. Changes
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Summary of ChangesHello @patulus, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! 이 풀 리퀘스트는 RoomMusicTag 엔티티의 equals() 및 hashCode() 메서드 구현을 개선하여 객체 동등성 비교의 정확성을 확보합니다. 이는 영속성 컨텍스트 초기화 과정에서 발생할 수 있는 null 값으로 인한 잘못된 비교 문제를 해결하고, 엔티티의 올바른 동작을 보장합니다. Highlights
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PR에서 설명해주신대로, 영속화 전 엔티티의 동등성 비교 문제를 해결하기 위해 equals 메서드를 수정한 것은 좋은 접근입니다. RoomTagId 대신 비즈니스 키에 해당하는 Room과 MusicTag 엔티티를 직접 비교하는 것이 올바른 방향입니다. 다만, hashCode 메서드 구현에 equals와 동등성 비교에 사용되는 필드가 모두 포함되지 않은 점이 우려됩니다. 이 부분에 대한 수정 의견을 리뷰 코멘트로 남겼습니다. equals/hashCode 계약을 올바르게 지키는 것은 객체의 동등성을 다루는 데 매우 중요하므로 확인 부탁드립니다.
src/main/java/queuing/core/room/domain/entity/RoomMusicTag.java
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src/main/java/queuing/core/room/domain/entity/RoomMusicTag.java (1)
45-55: RoomMusicTag의 equals-hashCode 계약 위반 수정 필요
Room과MusicTag엔티티가 적절한equals()/hashCode()를 구현하고 있음은 확인되었습니다. 그러나 RoomMusicTag의 구현에 심각한 문제가 있습니다.현재 구현에서
equals()메서드는 room과 tag 모두를 비교하지만(55줄),hashCode()메서드는 tag만 해싱합니다(59줄):return Objects.hash(this.getTag()); // tag만 고려이는 Java의 equals-hashCode 계약을 위반합니다. 동일한 room ID와 tag ID를 가진 두 객체는
equals()가 true를 반환하지만, room이 다르면equals()는 false를 반환하면서 동일한hashCode()값을 가질 수 있습니다. 이로 인해 HashSet, HashMap 등 해시 기반 컬렉션에서 예기치 않은 동작이 발생할 수 있습니다.
hashCode()구현을 수정하여 room과 tag 모두를 반영하도록 변경하시기 바랍니다:return Objects.hash(this.getRoom(), this.getTag());또한
equals()메서드에@Override어노테이션을 추가하시기 바랍니다.
🤖 Fix all issues with AI Agents
In @src/main/java/queuing/core/room/domain/entity/RoomMusicTag.java:
- Around line 57-60: hashCode() currently only hashes getTag() while equals()
compares both getRoom() and getTag(), causing inconsistent hash distribution;
update RoomMusicTag.hashCode() to include the same fields used in equals (e.g.,
this.getRoom() and this.getTag()) so the hashCode and equals contracts match,
using Objects.hash(...) with both identifiers (or room id + tag) to avoid
excessive hash collisions.
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src/main/java/queuing/core/room/domain/entity/RoomMusicTag.java (1)
1-61: Public Java API 변경 사항본 PR에서 변경된 공개 Java API는 다음과 같습니다:
RoomMusicTag.equals(Object obj): 동등성 비교 기준이id필드에서room과tag필드로 변경되었습니다. 이는 동작 변경(behavioral change)으로, 기존에id기반으로 동등성을 판단하던 코드에 영향을 줄 수 있습니다.
RoomMusicTag.hashCode(): 해시 코드 계산 기준이id에서tag로 변경되었습니다. (위 리뷰에서 언급한 대로room도 포함하도록 수정이 필요합니다.)이 변경은 버그 수정을 위한 의도적인 동작 변경이므로, 기존 동작에 의존하던 코드가 있다면 검토가 필요합니다.
- Room::addTag 실행 시 태그가 다름에도 같은 객체로 처리되는 문제를 수정합니다.
⭐️ 관련 이슈
closed #2
🚩 작업 요약
1️⃣ RoomTag 엔티티
equals()및hashCode()메서드 반환 값 수정equals()와hashCode()메서드를 수정해 동등성 비교가 요구사항과 일치하도록 수정했어요.