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IT'S A KOTLIN, KOTLIN, KOTLIN WORLD! JAKE WHARTON PRESENTS

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X

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X O X X X O

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X O X X X O O O X

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XOPlayer X X X O O O X XOPlayer

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iOS Web Server / API Android

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app/

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app/ wear/

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app/ wear/ common/

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app/ wear/ common/

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wear/ common/ app/

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app/ wear/ common/

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app/ wear/ common/

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app/ wear/ util/ common/

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app/ wear/ common/ util/ models/

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package xo; public enum Mark { X, O; }

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package xo; import java.util.Arrays; public final class Board { private static final int SIZE = 3; private final Mark[][] cells; public Board() { this.cells = new Mark[3][3]; } // TODO mutator methods... @Override public boolean equals(Object o) { if (this == o) return true; if (!(o instanceof Board)) return false; Board other = (Board) o; return Arrays.deepEquals(cells, other.cells); } @Override public int hashCode() { return Arrays.deepHashCode(cells);

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package xo; import static java.util.Objects.requireNonNull; public final class Player { public final String name; public final Mark mark; public Player(String name, Mark mark) { this.name = requireNonNull(name, "name == null"); this.mark = requireNonNull(mark, "mark == null"); } @Override public boolean equals(Object o) { if (this == o) return true; if (!(o instanceof Player)) return false; Player other = (Player) o; return name.equals(other.name) && mark == other.mark; } @Override public int hashCode() { return 31 * name.hashCode() + mark.hashCode(); }

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package xo; public enum State { PLAYER_1_MOVE, PLAYER_2_MOVE, PLAYER_1_WIN, PLAYER_2_WIN, DRAW, }

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package xo; import static java.util.Objects.requireNonNull; public final class Game { private final Board board; private final Player player1; private final Player player2; private State state = State.PLAYER_1_MOVE; public Game(Board board, Player player1, Player player2) { this.board = requireNonNull(board, "board == null"); this.player1 = requireNonNull(player1, "player1 == null"); this.player2 = requireNonNull(player2, "player2 == null"); } // TODO mutator methods... @Override public boolean equals(Object o) { if (this == o) return true; if (!(o instanceof Game)) return false; Game other = (Game) o; return board.equals(other.board) && player1.equals(other.player1)

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Game Board Mark State Player

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public final class Player { public final String name; public final Mark mark; public Player(String name, Mark mark) { this.name = requireNonNull(name, "name == null"); this.mark = requireNonNull(mark, "mark == null"); }A @Override public boolean equals(Object o) { if (this == o) return true; if (!(o instanceof Player)) return false; Player other = (Player) o; return name.equals(other.name) && mark == other.mark; }B @Override public int hashCode() { return 31 * name.hashCode() + mark.hashCode(); }C @Override public String toString() { return "Player{name='" + name + ", mark=" + mark + '}'; }D }E

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data class Player(val name: String, val mark: Mark) public final { public final ; public final ; public Player(String name, Mark mark) { this.name = requireNonNull(name, "name == null"); this.mark = requireNonNull(mark, "mark == null"); }A @Override public boolean equals(Object o) { if (this == o) return true; if (!(o instanceof Player)) return false; Player other = (Player) o; return name.equals(other.name) && mark == other.mark; }B @Override public int hashCode() { return 31 * name.hashCode() + mark.hashCode(); }C @Override public String toString() { return "Player{name='" + name + ", mark=" + mark + '}'; }D }E

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Game Mark State Board Player

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State Board Game Mark Player

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Game Mark State Board *.java *.kt Player

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*.kt Game Mark State *.java

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kotlinc *.kt Game Mark State *.java

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*.kt Game Mark State *.java kotlinc

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javac *.kt Game Mark State *.java kotlinc

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javac *.kt Game Mark State *.java kotlinc

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kotlinc javac *.kt Game Mark State *.java

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kotlin-stdlib kotlinc javac *.kt Game Mark State *.java

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kotlin-stdlib kotlinc javac *.kt Game Mark State *.java models/

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kotlin-stdlib kotlinc javac *.kt Game Mark State *.java models/

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kotlin-stdlib kotlinc javac *.kt Game Mark State *.java models/

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kotlin-stdlib kotlinc javac *.kt Game Mark State *.java

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kotlin-stdlib kotlinc Game Mark State javac *.kt *.java

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kotlin-stdlib kotlinc Game Mark State javac *.kt *.java

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kotlin-stdlib kotlinc State Mark Game javac *.kt *.java

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kotlin-stdlib kotlinc State *.java Mark Game javac *.kt

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kotlin-stdlib kotlinc *.java State Mark Game *.kt

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app/ wear/ common/ util/ models/ kotlin-stdlib kotlinc *.java State Mark Game *.kt

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app/ wear/ common/ util/ models/

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Server / API iOS Web Android app/ wear/ common/ util/ models/

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Server / API iOS Web Android app/ wear/ util/ models/ common/

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Server / API iOS Web Android app/ wear/ util/ models/ common/

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Server / API iOS Web Android app/ wear/ util/ models/ common/

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Server / API iOS Web Android app/ wear/ util/ models/ common/ protos

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iOS Web Server / API Android

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iOS Web Server / API Android

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iOS Web Server / API Android View Models

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iOS Web Server / API Android View Models Presenters

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iOS Web Server / API Android View Models Presenters

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iOS Web Server / API Android View Models Presenters Client Backend

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iOS Web Server / API Android View Models Presenters Client Backend

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iOS Web Server / API Android View Models Presenters Client Backend Business Logic

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iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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data class NewGameUiModel( val winTotal: Long, val lossTotal: Long )

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data class NewGameUiModel( val winTotal: Long, val lossTotal: Long ) data class GameUiModel( val game: Game )

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data class NewGameUiModel( val winTotal: Long, val lossTotal: Long ) data class GameUiModel( ) val game: Game

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data class NewGameUiModel( val winTotal: Long, val lossTotal: Long ) data class GameUiModel( val game: Game )

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iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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class NewGamePresenter {C fun model(): NewGameUiModel { }B }A

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class NewGamePresenter(private val gameStore: GameStore) {C fun model(): NewGameUiModel { }B }A

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class NewGamePresenter(private val gameStore: GameStore) {C fun model(): NewGameUiModel { val totals = gameStore.totals() return NewGameUiModel(totals.wins, totals.losses) }B }A

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class GamePresenter {D fun model(): GameUiModel {C }B }A

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class GamePresenter(private val gameId: Long) {D fun model(): GameUiModel {C }B }A

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class GamePresenter( private val gameId: Long, private val gameStore: GameStore ) {D fun model(): GameUiModel {C }B }A

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class GamePresenter( private val gameId: Long, private val gameStore: GameStore ) {D fun models(): Observable {C }B }A

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class GamePresenter( private val gameId: Long, private val gameStore: GameStore ) {D fun move(row: Int, col: Int)Z{C }G fun models(): Observable {C }B }A

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class GamePresenter( private val gameId: Long, private val gameStore: GameStore ) {D fun models(events: Observable): Observable {C }B sealed class UiEvent { data class Move(val row: Int, val col: Int): UiEvent() // ... } }A fun move( )Z{C }G

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iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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interface GameStore { }A

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interface GameStore { fun totals(): Single data class Totals(val wins: Long, val losses: Long) }A

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interface GameStore { fun totals(): Single fun game(id: Long): Observable data class Totals(val wins: Long, val losses: Long) }A

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interface GameStore { fun totals(): Single fun game(id: Long): Observable fun move(id: Long, row: Int, col: Int): Completable data class Totals(val wins: Long, val losses: Long) }A

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iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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Android iOS Web iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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class SqliteGameStore(private val db: SQLiteDatabase) : GameStore { override fun totals() = TODO() override fun game(id: Long) = TODO() override fun move(id: Long, row: Int, col: Int) = TODO() }

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class IosGameStore(private val db: CoreDataGameStore) : GameStore { override fun totals() = TODO() override fun game(id: Long) = TODO() override fun move(id: Long, row: Int, col: Int) = TODO() }

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class IosGameStore( ) : GameStore { override fun totals() = TODO() override fun game(id: Long) = TODO() override fun move(id: Long, row: Int, col: Int) = TODO() } private val db: CoreDataGameStore

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class IosGameStore( ) : GameStore { override fun totals() = TODO() override fun game(id: Long) = TODO() override fun move(id: Long, row: Int, col: Int) = TODO() } private val db: CoreDataGameStore // tictactoe.def headers = game_store.h

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class StorageGameStore(private val store: Storage) : GameStore { override fun totals() = TODO() override fun game(id: Long) = TODO() override fun move(id: Long, row: Int, col: Int) = TODO() }A

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import org.w3c.dom.Storage class StorageGameStore( ) : GameStore { override fun totals() = TODO() override fun game(id: Long) = TODO() override fun move(id: Long, row: Int, col: Int) = TODO() }A private val store: Storage

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Android iOS Web iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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Android iOS Web iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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Android iOS Web iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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Android iOS Web iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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object TicTacToeLogic { fun validateMove( game: Game, player: Player, row: Int, col: Int): Boolean { when (game.state) { State.PLAYER_1_MOVE -> require(game.player1 == player) State.PLAYER_2_MOVE -> require(game.player2 == player) else -> error("Game is over") } return game.board[row][col] == null } fun nextState(game: Game): State { findWinner(game.board)?.let { return if (game.player1.mark == it) State.PLAYER_1_WIN else State.PLAYER_2_WIN } if (game.board.isComplete()) { return State.DRAW } return if (game.state == State.PLAYER_1_MOVE) State.PLAYER_2_MOVE else State.PLAYER_1_MOVE } fun findWinner(board: Board): Mark? = TODO() fun Board.isComplete(): Boolean = TODO() }

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Android iOS Web iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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Android iOS Web iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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Android iOS Web iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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Android iOS Web iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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class GameView(context: Context, attrs: AttributeSet) : Consumer { fun accept(model: GamePresenter.UiModel) { // TODO bind to view... } }

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iOS???

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function update(model) { // TODO bind to DOM/template/JSX/whatever... }

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@POST @Path("/api/move") fun Game move( @QueryParam("id") id: Long, @QueryParam("row") row: Int, @QueryParam("col") col: Int) { // TODO check business logic, persist, return udpated game ... }

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Android iOS Web iOS Web Server / API Android View Models Presenters Client Backend Business Logic Models

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X O X X X O O O X

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IT'S A KOTLIN, KOTLIN, KOTLIN WORLD! @JAKEWHARTON