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![class PlayerWithFriends setup: => a role @friends = [] @invitedFriends = [] @acceptedFriends = [] setInvitedFriends: (facebookUids) => for facebookUid in facebookUids friend = new Friend({facebookUid: facebookUid}) @invitedFriends.push(friend) setFriends: (friends) => @friends = friends addFriend: (friend) => existing = @getFriendByFacebookUid(friend?.facebookUid) if not existing? @friends.push(friend)](https://image.slidesharecdn.com/lightningio2012usecases-120722182708-phpapp01/75/Use-cases-in-the-code-with-AOP-22-2048.jpg)
Uploaded byAndrzej Krzywda
Use cases in the code with AOP
The document discusses the importance of use cases in code. It provides an example use case class for playing a team game that defines roles, algorithms, and domain objects without mentioning the GUI, persistence, or external API calls. The goal is clean use case code, and aspects like the GUI and persistence can be handled separately through aspect-oriented programming and dependency injection of roles at runtime.
Use cases in the code with AOP
- 1. Use cases are important Andrzej Krzywda
- 2. Use cases in thecode are even more important
- 3. class PlayTeamGameUseCase constructor: (@game, @player) -> Role(@player, PlayerWithFriends) Role(@game, TeamCompetition) tryToEnterGameArea: () => if @amIEnteringGameFirstTime() if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() @teachPlayerHowToPlay() else #n-th time... if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() if @haveNotYetPickedFavPizzaCountry() @askPlayerToDeclareHisFavPizzaCountry() (more methods here)
- 4. Name class PlayTeamGameUseCase constructor: (@game, @player) -> Role(@player, PlayerWithFriends) Role(@game, TeamCompetition) tryToEnterGameArea: () => if @amIEnteringGameFirstTime() if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() @teachPlayerHowToPlay() else #n-th time... if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() if @haveNotYetPickedFavPizzaCountry() @askPlayerToDeclareHisFavPizzaCountry() (more methods here)
- 5. Name class PlayTeamGameUseCase constructor: (@game, @player) -> Actors Role(@player, PlayerWithFriends) Role(@game, TeamCompetition) tryToEnterGameArea: () => if @amIEnteringGameFirstTime() if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() @teachPlayerHowToPlay() else #n-th time... if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() if @haveNotYetPickedFavPizzaCountry() @askPlayerToDeclareHisFavPizzaCountry() (more methods here)
- 6. Name class PlayTeamGameUseCase constructor: (@game, @player) -> Actors Role(@player, PlayerWithFriends) Role(@game, TeamCompetition) Roles tryToEnterGameArea: () => if @amIEnteringGameFirstTime() if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() @teachPlayerHowToPlay() else #n-th time... if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() if @haveNotYetPickedFavPizzaCountry() @askPlayerToDeclareHisFavPizzaCountry() (more methods here)
- 7. Name class PlayTeamGameUseCase constructor: (@game, @player) -> Actors Role(@player, PlayerWithFriends) Role(@game, TeamCompetition) Roles tryToEnterGameArea: () => if @amIEnteringGameFirstTime() if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() @teachPlayerHowToPlay() Algorithm else #n-th time... if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() if @haveNotYetPickedFavPizzaCountry() @askPlayerToDeclareHisFavPizzaCountry() (more methods here)
- 8. Name class PlayTeamGameUseCase constructor: (@game, @player) -> Actors Role(@player, PlayerWithFriends) Role(@game, TeamCompetition) Roles tryToEnterGameArea: () => if @amIEnteringGameFirstTime() if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() @teachPlayerHowToPlay() Algorithm else #n-th time... if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() uses domain objects if @haveNotYetPickedFavPizzaCountry() @askPlayerToDeclareHisFavPizzaCountry() (more methods here)
- 9. Name class PlayTeamGameUseCase constructor: (@game, @player) -> Actors Role(@player, PlayerWithFriends) Role(@game, TeamCompetition) Roles tryToEnterGameArea: () => if @amIEnteringGameFirstTime() if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() @teachPlayerHowToPlay() Algorithm else #n-th time... if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() uses domain objects if @haveNotYetPickedFavPizzaCountry() @askPlayerToDeclareHisFavPizzaCountry() (more methods here) Nothing about GUI or persistence!
- 10. Where is? • GUI •Persistence • API calls • events
- 11. A clean usecase code is the main goal
- 12.
- 13.
- 14. AOP gives us methodhooks
- 15.
- 16.
- 17. class GameUseCaseGlue constructor: (@gameUseCase, @game, @gui) -> execute: () => Around(@gameUseCase, 'tryToEnterGameArea', @checkFbInvitation) After (@gameUseCase, 'tryToEnterGameArea', @showTeamArea) After (@gameUseCase, 'tryToEnterGameArea', @showButtonInviteOrPostPicture) Around(@gameUseCase, 'tellPlayerHeIsPartOfTeam', @showTeamPopup) Around(@gameUseCase, 'askPlayerToLikeFanpage', @showLikePopup) Around(@gameUseCase, 'teachPlayerHowToPlay', @showTutorialPopup) Around(@gameUseCase, 'playerWantsToKnowWinnersWithPrize', @showWinnersPopup) Around(@gameUseCase, 'playerWantsToKnowPrizes', @showPrizesPopup) Around(@gameUseCase, 'askPlayerToDeclareHisFavCountry', @showDeclareCountryPopup) Around(@gameUseCase, 'iAcceptMyFriendInvitationToATeam', @onIAcceptMyFriendInvitationToATeam) Around(@gui, 'inviteClicked', @inviteFriends) # gameUseCase.inviteFriends Around(@gameUseCase, 'inviteFriends', @storeInvitationInTheDB) DB here Glue code
- 18.
- 19. (still glue code) showTeamPopup:(proceed, friendsInviting) => data = {inviting_friends: friendsInviting} popup = @popupsComponent.showPopup('team_popup', data) popup.onClose => proceed(friendsInviting))
- 20.
- 21. class PlayTeamGameUseCase Use case == context constructor: (@game, @player) -> Role(@player, PlayerWithFriends) Role(@game, TeamCompetition) Roles injected runtime tryToEnterGameArea: () => if @amIEnteringGameFirstTime() if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() data objects interact with @teachPlayerHowToPlay() each other else #n-th time... if @amICommingFromInvitation() @tellPlayerHeIsPartOfTeam() if @haveNotYetPickedFavPizzaCountry() @askPlayerToDeclareHisFavPizzaCountry() (more methods here)
- 22. class PlayerWithFriends setup: => a role @friends = [] @invitedFriends = [] @acceptedFriends = [] setInvitedFriends: (facebookUids) => for facebookUid in facebookUids friend = new Friend({facebookUid: facebookUid}) @invitedFriends.push(friend) setFriends: (friends) => @friends = friends addFriend: (friend) => existing = @getFriendByFacebookUid(friend?.facebookUid) if not existing? @friends.push(friend)
- 23. not only for SinglePage Applications
- 24. What use casesare in your project?
- 25. learn more aboutAOP and DCI and ... Enjoy writing elegant use cases!