イベントソーシングとドメインモデリング

Transcript

1. ΠϕϯτιʔγϯάͱυϝΠϯϞσϦϯά ,PTVLF
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2. Πϕϯτιʔγϯά͸༏Ε͍ͯΔ͕ϕετϓϥΫςΟεͰ͸ͳ͍ εέʔϥϏϦςΟ΍σʔλͱͯ͠ͷՁ஋͸ඇৗʹߴ͍ҰํͰɺ
   ෼ࢄγεςϜతͳඇಉظॲཧɺεφοϓγϣοτɺ
   Πϕϯτόʔδϣχϯάɺ
   ू໿ͷू߹ͷόϦσʔγϣϯͳͲɺ
   ෳ਺ͷٕज़తϋʔυϧ͕͋Δɻ l"SF
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3. Πϕϯτ͸υϝΠϯϞσϦϯάͷཁ ʮϞϊʯͷ
   $36%
   Ͱ͸ͳ͘ʮίτʯΛ෼ੳ͢Δ͜ͱͰɺ;Δ ·͍๛͔ͳυϝΠϯϞσϧ͕खʹೖΔ
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   :PVOH lΠϕϯτιʔγϯά͸಺෦ઃܭ্ͷςʔϚͰ͋ͬͯɺσʔλϞσϧ্ͷ֓೦Ͱ͸͋ Γ·ͤΜɻ தུ ཤྺ͔Β࠶ݱ͞ΕΔ࠷৽σʔλͷܗ͚ͩΛ໰୊ʹ͢Ε͹Α͍Θ͚ Ͱ͢ɻͦΕͷΈ͕ۀ຿Ϣʔβʔͷؔ৺͝ͱ͔ͩΒͰ͢ɻ
   zʰσʔλϞσϦϯάͰυϝ ΠϯΛۦಈ͢Δʱਿຊܒ
4. Πϕϯτιʔγϯά͸
   30*
   ʹݟ߹Θͳ͍ͱͯ͠΋ɺ
   ΠϕϯτΛத৺ͱͨ͠υϝΠϯϞσϦϯάͱ࣮૷͸͍ͨ͠ Πϕϯτιʔγϯά͸಺෦ઃܭ͕ͩɺ
   Πϕϯτͷ֓೦͸υϝΠϯϞσϧͷҰ෦ͱͯ͠֎෦ઃܭʹͳΔ
5. type ArchiveArticleCommandService struct { Repository article.Repository } type ArchiveArticleCommand struct { ArticleID uuid.UUID } func (s ArchiveArticleService) Handle(ctx context.Context, command ArchiveArticleCommand) (article.Archived, error) { current := time.Now() anArticle, err := s.Repository.Find(ctx, command.AccountID) if err != nil { return account.Archived{}, errors.New(...) } event, err := anArticle.Archive(current) if err != nil { return account.Archived{}, errors.New(...) } if err := s.Repository.PersistEvent(ctx, event); err != nil { return account.Archived{}, errors.New(...) } return event }
6. type ArchiveArticleCommandService struct { Repository article.Repository } type ArchiveArticleCommand struct { ArticleID uuid.UUID } func (s ArchiveArticleService) Handle(ctx context.Context, command ArchiveArticleCommand) (article.Archived, error) { current := time.Now() anArticle, err := s.Repository.Find(ctx, command.AccountID) if err != nil { return account.Archived{}, errors.New(...) } event, err := anArticle.Archive(current) if err != nil { return account.Archived{}, errors.New(...) } if err := s.Repository.PersistEvent(ctx, event); err != nil { return account.Archived{}, errors.New(...) } return event } ϦϙδτϦ͔Βهࣄू໿Λऔಘ
7. type ArchiveArticleCommandService struct { Repository article.Repository } type ArchiveArticleCommand struct { ArticleID uuid.UUID } func (s ArchiveArticleService) Handle(ctx context.Context, command ArchiveArticleCommand) (article.Archived, error) { current := time.Now() anArticle, err := s.Repository.Find(ctx, command.AccountID) if err != nil { return account.Archived{}, errors.New(...) } event, err := anArticle.Archive(current) if err != nil { return account.Archived{}, errors.New(...) } if err := s.Repository.PersistEvent(ctx, event); err != nil { return account.Archived{}, errors.New(...) } return event } هࣄू໿ʹʮΞʔΧΠϒͨ͠ʯ ΠϕϯτΛ࡞੒ͤ͞Δ
8. type ArchiveArticleCommandService struct { Repository article.Repository } type ArchiveArticleCommand struct { ArticleID uuid.UUID } func (s ArchiveArticleService) Handle(ctx context.Context, command ArchiveArticleCommand) (article.Archived, error) { current := time.Now() anArticle, err := s.Repository.Find(ctx, command.AccountID) if err != nil { return account.Archived{}, errors.New(...) } event, err := anArticle.Archive(current) if err != nil { return account.Archived{}, errors.New(...) } if err := s.Repository.PersistEvent(ctx, event); err != nil { return account.Archived{}, errors.New(...) } return event } ʮΞʔΧΠϒͨ͠ʯΠϕϯτΛ ϦϙδτϦʹ౉ͯ͠ӬଓԽ
9. type ArticleRepository struct { Conn sqlx.DB } func (r ArticleRepository) PersistEvent(ctx context.Context, event article.Event) error { switch e := event.(type) { case article.Archived: if _, err := r.Conn.ExecContext(ctx, `INSERT INTO article_archivements (article_id, archived_at) VALUE (?, ?)`, e.ArticleID, e.ArchivedAt); err != nil { return errors.New(...) } case ... default: return errors.New(...) } } func (r ArticleRepository) Find(ctx context.Context, id uuid.UUID) (*article.Article, error) { var data articleData if err := r.Conn.GetContext(ctx, data, `SELECT articles.id, .... FROM articles WHERE articles.id = ?`); err != nil { return nil, errors.New(...) } return r.convertToAggregate(data), nil } શͯΛΠϕϯτͱͯ͠ӬଓԽ͢ΔͷͰ͸ͳ͘ɺ
   ϦιʔεͱΠϕϯτͷ྆ํΛ
   3%#
   ͷςʔϒϧͰදݱɻ
   ΠϕϯτͷӬଓԽͱू໿ͷ࠶ߏங͚ͩͰͳ͘ɺ
   ΫΤϦϞσϧͷߏஙʹ΋࢖͑ΔΑ͏ʹ
   ςʔϒϧΛઃܭ͢Δɻ
   ΠϕϯτछผʹԠͯ͡ߋ৽ܥͷ
   42-
   Λൃߦ ϦιʔεͱΠϕϯτ͔Βू໿Λ࠶ߏங
10. ͜ͷ࣮૷ͷϝϦοτͱσϝϦοτ 👍 ɾϦιʔεͷߋ৽ΛҰఆڐ༰͢ΔͨΊɺ׬શͳΠϕϯτཤྺ͸࢒Βͳ͍ 👎 ɾΠϕϯτத৺ͷυϝΠϯϞσϧΛ࣮૷Ͱ͖Δ
    ɾΠϕϯτιʔγϯάͷ࣮ݱʹඞཁͳίετΛ෷ΘͣʹࡁΉ ɾΠϯϐʔμϯεϛεϚον͕େ͖͘ͳΔ͜ͱ͕͋Δ