Une exception on the command.run to notify the player instead on direct send

src/main/kotlin/eventDemo/app/command/CommandException.kt

@@ -0,0 +1,5 @@
+package eventDemo.app.command
+
+class CommandException(
+  override val message: String,
+) : Exception(message)

src/main/kotlin/eventDemo/app/command/ErrorNotifier.kt

@@ -14,7 +14,7 @@ fun errorNotifier(
 ): ErrorNotifier =
   {
     val logger = KotlinLogging.logger { }
-    ErrorNotification(message = it)
+    ErrorNotification(message = it, command = command)
       .let { notification ->
         logger.atWarn {
           message = "Notification ERROR sent: ${notification.message}"

src/main/kotlin/eventDemo/app/command/GameCommandRunner.kt

@@ -19,13 +19,16 @@ class GameCommandRunner(
     outgoingErrorChannelNotification: SendChannel<Notification>,
   ) {
     val gameState = gameStateRepository.getLast(command.payload.aggregateId)
-    val errorNotifier = errorNotifier(command, outgoingErrorChannelNotification)
 
+    try {
       when (command) {
-      is IWantToPlayCardCommand -> command.run(gameState, errorNotifier, this.eventHandler)
-      is IamReadyToPlayCommand -> command.run(gameState, errorNotifier, this.eventHandler)
-      is IWantToJoinTheGameCommand -> command.run(gameState, errorNotifier, this.eventHandler)
-      is ICantPlayCommand -> command.run(gameState, errorNotifier, this.eventHandler)
+        is IWantToPlayCardCommand -> command.run(gameState, this.eventHandler)
+        is IamReadyToPlayCommand -> command.run(gameState, this.eventHandler)
+        is IWantToJoinTheGameCommand -> command.run(gameState, this.eventHandler)
+        is ICantPlayCommand -> command.run(gameState, this.eventHandler)
+      }
+    } catch (e: CommandException) {
+      errorNotifier(command, outgoingErrorChannelNotification)(e.message)
     }
   }
 }

src/main/kotlin/eventDemo/app/command/command/ICantPlayCommand.kt

@@ -1,6 +1,6 @@
 package eventDemo.app.command.command
 
-import eventDemo.app.command.ErrorNotifier
+import eventDemo.app.command.CommandException
 import eventDemo.app.entity.GameId
 import eventDemo.app.entity.Player
 import eventDemo.app.event.GameEventHandler
@@ -26,12 +26,10 @@ data class ICantPlayCommand(
 
   suspend fun run(
     state: GameState,
-    playerErrorNotifier: ErrorNotifier,
     eventHandler: GameEventHandler,
   ) {
     if (state.currentPlayerTurn != payload.player) {
-      playerErrorNotifier("Its not your turn!")
-      return
+      throw CommandException("Its not your turn!")
     }
     val playableCards = state.playableCards(payload.player)
     if (playableCards.isEmpty()) {
@@ -46,7 +44,7 @@ data class ICantPlayCommand(
         )
       }
     } else {
-      playerErrorNotifier("You can and must play one card, like ${playableCards.first()::class.simpleName}")
+      throw CommandException("You can and must play one card, like ${playableCards.first()::class.simpleName}")
     }
   }
 }

src/main/kotlin/eventDemo/app/command/command/IWantToJoinTheGameCommand.kt

@@ -1,6 +1,6 @@
 package eventDemo.app.command.command
 
-import eventDemo.app.command.ErrorNotifier
+import eventDemo.app.command.CommandException
 import eventDemo.app.entity.GameId
 import eventDemo.app.entity.Player
 import eventDemo.app.event.GameEventHandler
@@ -26,7 +26,6 @@ data class IWantToJoinTheGameCommand(
 
   suspend fun run(
     state: GameState,
-    playerErrorNotifier: ErrorNotifier,
     eventHandler: GameEventHandler,
   ) {
     if (!state.isStarted) {
@@ -38,7 +37,7 @@ data class IWantToJoinTheGameCommand(
         )
       }
     } else {
-      playerErrorNotifier("The game is already started")
+      throw CommandException("The game is already started")
     }
   }
 }

src/main/kotlin/eventDemo/app/command/command/IWantToPlayCardCommand.kt

@@ -1,6 +1,6 @@
 package eventDemo.app.command.command
 
-import eventDemo.app.command.ErrorNotifier
+import eventDemo.app.command.CommandException
 import eventDemo.app.entity.Card
 import eventDemo.app.entity.GameId
 import eventDemo.app.entity.Player
@@ -28,16 +28,13 @@ data class IWantToPlayCardCommand(
 
   suspend fun run(
     state: GameState,
-    playerErrorNotifier: ErrorNotifier,
     eventHandler: GameEventHandler,
   ) {
     if (!state.isStarted) {
-      playerErrorNotifier("The game is Not started")
-      return
+      throw CommandException("The game is Not started")
     }
     if (state.currentPlayerTurn != payload.player) {
-      playerErrorNotifier("Its not your turn!")
-      return
+      throw CommandException("Its not your turn!")
     }
 
     if (state.canBePlayThisCard(payload.player, payload.card)) {
@@ -50,7 +47,7 @@ data class IWantToPlayCardCommand(
         )
       }
     } else {
-      playerErrorNotifier("You cannot play this card")
+      throw CommandException("You cannot play this card")
     }
   }
 }

src/main/kotlin/eventDemo/app/command/command/IamReadyToPlayCommand.kt

@@ -1,6 +1,6 @@
 package eventDemo.app.command.command
 
-import eventDemo.app.command.ErrorNotifier
+import eventDemo.app.command.CommandException
 import eventDemo.app.entity.GameId
 import eventDemo.app.entity.Player
 import eventDemo.app.event.GameEventHandler
@@ -24,20 +24,20 @@ data class IamReadyToPlayCommand(
     override val player: Player,
   ) : GameCommand.Payload
 
+  @Throws(CommandException::class)
   suspend fun run(
     state: GameState,
-    playerErrorNotifier: ErrorNotifier,
     eventHandler: GameEventHandler,
   ) {
     val playerExist: Boolean = state.players.contains(payload.player)
     val playerIsAlreadyReady: Boolean = state.readyPlayers.contains(payload.player)
 
     if (state.isStarted) {
-      playerErrorNotifier("The game is already started")
+      throw CommandException("The game is already started")
     } else if (!playerExist) {
-      playerErrorNotifier("You are not in the game")
+      throw CommandException("You are not in the game")
     } else if (playerIsAlreadyReady) {
-      playerErrorNotifier("You are already ready")
+      throw CommandException("You are already ready")
     } else {
       eventHandler.handle(payload.aggregateId) {
         PlayerReadyEvent(

src/main/kotlin/eventDemo/app/notification/ErrorNotification.kt

@@ -1,12 +1,17 @@
 package eventDemo.app.notification
 
 import eventDemo.configuration.UUIDSerializer
+import eventDemo.libs.command.Command
 import kotlinx.serialization.Serializable
 import java.util.UUID
 
+sealed interface CommandStateNotification : Notification
+
 @Serializable
 data class ErrorNotification(
   @Serializable(with = UUIDSerializer::class)
   override val id: UUID = UUID.randomUUID(),
   val message: String,
-) : Notification
+  val command: Command,
+) : Notification,
+  CommandStateNotification