classDiagram class FeedResource { <> +GET /api/v1/feed : FeedResponse +GET /api/v1/feed/user/:userId : FeedResponse +POST /api/v1/feed/refresh : FeedResponse +GET /api/v1/feed/:feedId : PostResponse } class PostResource { <> +POST /api/v1/posts : PostResponse +GET /api/v1/posts/:postId : PostResponse +PUT /api/v1/posts/:postId : PostResponse +DELETE /api/v1/posts/:postId : StatusResponse +GET /api/v1/posts/user/:userId : PostListResponse } class LikeResource { <> +POST /api/v1/posts/:postId/like : LikeResponse +DELETE /api/v1/posts/:postId/like : StatusResponse +GET /api/v1/posts/:postId/likes : LikeListResponse } class CommentResource { <> +POST /api/v1/posts/:postId/comments : CommentResponse +GET /api/v1/posts/:postId/comments : CommentListResponse +PUT /api/v1/comments/:commentId : CommentResponse +DELETE /api/v1/comments/:commentId : StatusResponse } class FollowResource { <> +POST /api/v1/users/:userId/follow : FollowResponse +DELETE /api/v1/users/:userId/unfollow : StatusResponse +GET /api/v1/users/:userId/followers : FollowerListResponse +GET /api/v1/users/:userId/following : FollowerListResponse } class FeedResponse { <> +posts: List~PostDTO~ +nextCursor: String +hasMore: Boolean +timestamp: Long } class PostResponse { <> +post: PostDTO +status: String +timestamp: Long } class PostListResponse { <> +posts: List~PostDTO~ +totalCount: Integer +page: Integer } class PostDTO { <> +postId: String +userId: String +content: String +mediaUrls: List~String~ +createdAt: Long +updatedAt: Long +likeCount: Integer +commentCount: Integer +shareCount: Integer } class CreatePostRequest { <> +content: String +mediaUrls: List~String~ +visibility: String +tags: List~String~ } class UpdatePostRequest { <> +content: String +mediaUrls: List~String~ +visibility: String } class LikeResponse { <> +likeId: String +postId: String +userId: String +timestamp: Long } class LikeListResponse { <> +likes: List~LikeDTO~ +totalCount: Integer } class LikeDTO { <> +likeId: String +userId: String +username: String +avatarUrl: String +likedAt: Long } class CommentResponse { <> +comment: CommentDTO +status: String } class CommentListResponse { <> +comments: List~CommentDTO~ +totalCount: Integer +nextCursor: String } class CommentDTO { <> +commentId: String +postId: String +userId: String +content: String +createdAt: Long +likeCount: Integer } class CreateCommentRequest { <> +content: String +parentCommentId: String } class FollowResponse { <> +followId: String +followerId: String +followingId: String +timestamp: Long } class FollowerListResponse { <> +users: List~UserDTO~ +totalCount: Integer +nextCursor: String } class UserDTO { <> +userId: String +username: String +displayName: String +avatarUrl: String +bio: String +followerCount: Integer +followingCount: Integer } class StatusResponse { <> +success: Boolean +message: String +timestamp: Long } FeedResource --> FeedResponse FeedResource --> PostResponse PostResource --> PostResponse PostResource --> PostListResponse PostResource --> CreatePostRequest PostResource --> UpdatePostRequest PostResource --> StatusResponse LikeResource --> LikeResponse LikeResource --> LikeListResponse LikeResource --> StatusResponse CommentResource --> CommentResponse CommentResource --> CommentListResponse CommentResource --> CreateCommentRequest CommentResource --> StatusResponse FollowResource --> FollowResponse FollowResource --> FollowerListResponse FollowResource --> StatusResponse FeedResponse --> PostDTO PostResponse --> PostDTO PostListResponse --> PostDTO LikeListResponse --> LikeDTO CommentListResponse --> CommentDTO CommentResponse --> CommentDTO FollowerListResponse --> UserDTO

Social Media Feed System Design

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