패스트캠퍼스 환급챌린지 15일차 : 9개 도메인 프로젝트로 끝내는 백엔드 웹 개발 (Java/Spring) 초격차 패키지 Online 강의 후기

본 포스팅은 패스트캠퍼스 환급 챌린지 참여를 위해 작성하였습니다.

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Post.java

package org.fastcampus.post.domain;

import org.fastcampus.common.domain.*;
import org.fastcampus.post.domain.content.Content;
import org.fastcampus.post.domain.content.PostContent;
import org.fastcampus.post.domain.content.PostPublicationState;
import org.fastcampus.user.domain.User;

public class Post {
    private final Long id;
    private final User author;
    private final Content content;
    private final PositiveIntegerCounter likeCount;
    private PostPublicationState state;

    public static Post createPost(Long id, User author, String content, PostPublicationState state) {
        return new Post(id, author, new PostContent(content), state);
    }

    public static Post createDefaultPost(Long id, User author, String content) {
        return new Post(id, author, new PostContent(content), PostPublicationState.PUBLIC);
    }

    protected Post(Long id, User author, String content) {
        this(id, author, new PostContent(content), PostPublicationState.PUBLIC);
    }

    public Post(Long id, User author, Content content, PostPublicationState state) {
        if (author == null) {
            throw new IllegalArgumentException();
        }

        this.id = id;
        this.author = author;
        this.content = content;
        this.likeCount = new PositiveIntegerCounter();
        this.state = state;
    }

    public void like(User user) {
        if (this.author.equals(user)) {
            throw new IllegalArgumentException();
        }
        likeCount.increase();
    }

    public void unlike() {
        likeCount.decrease();
    }

    public void updatePost(User user, String updateContent, PostPublicationState state) {
        if (!this.author.equals(user)) {
            throw new IllegalArgumentException();
        }

        this.content.updateContent(updateContent);
        this.state = state;
    }

    public int getLikeCount() {
        return likeCount.getCount();
    }

    public String getContent() {
        return content.getContentText();
    }
}

PostRepository.java

package org.fastcampus.post.application.Interfaces;

import java.util.Optional;
import org.fastcampus.post.domain.*;

public interface PostRepository {
    Post save(Post post);
    Optional<Post> findById(Long id);
}

LikeRepository.java

package org.fastcampus.post.application.Interfaces;

import org.fastcampus.post.domain.Post;
import org.fastcampus.user.domain.User;

public interface LikeRepository {
    boolean checkLike(Post post, User user);
    void like(Post post, User user);
    void unlike(Post post, User user);
}

PostService.java

package org.fastcampus.post.application;

import org.fastcampus.post.application.Interfaces.*;
import org.fastcampus.post.application.dto.*;
import org.fastcampus.post.domain.*;
import org.fastcampus.user.application.UserService;
import org.fastcampus.user.domain.User;

public class PostService {
    private final UserService userService;
    private final PostRepository postRepository;
    private final LikeRepository likeRepository;

    public PostService(UserService userService, PostRepository postRepository, LikeRepository likeRepository) {
        this.userService = userService;
        this.postRepository = postRepository;
        this.likeRepository = likeRepository;
    }

    public Post getPost(Long id) {
        return postRepository.findById(id).orElseThrow(() -> new IllegalArgumentException());
    }

    public Post createPost(CreatePostRequestDto dto) {
        User author = userService.getUser(dto.userId());
        Post post = Post.createPost(null, author, dto.content(), dto.state());
        return postRepository.save(post);
    }

    public Post updatePost(UpdatePostRequestDto dto) {
        Post post = getPost(dto.postId());
        User user = userService.getUser(dto.userId());
        post.updatePost(user, dto.content(), dto.state());
        return postRepository.save(post);
    }

    public void likePost(LikePostRequestDto dto) {
        Post post = getPost(dto.postId());
        User user = userService.getUser(dto.userId());

        if (likeRepository.checkLike(post, user)) {
            return;
        }

        post.like(user);
        likeRepository.like(post, user);
    }

    public void unlikePost(LikePostRequestDto dto) {
        Post post = getPost(dto.postId());
        User user = userService.getUser(dto.userId());

        if (likeRepository.checkLike(post, user)) {
            post.unlike();
            likeRepository.unlike(post, user);
        }
    }
}

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