create GameStateRepositoryInRedis

src/main/kotlin/eventDemo/adapter/infrastructureLayer/event/projection/GameStateRepositoryInRedis.kt

@@ -0,0 +1,63 @@
+package eventDemo.adapter.infrastructureLayer.event.projection
+
+import eventDemo.business.entity.GameId
+import eventDemo.business.event.GameEventBus
+import eventDemo.business.event.GameEventStore
+import eventDemo.business.event.event.GameEvent
+import eventDemo.business.event.projection.GameProjectionBus
+import eventDemo.business.event.projection.gameState.GameState
+import eventDemo.business.event.projection.gameState.GameStateRepository
+import eventDemo.business.event.projection.gameState.apply
+import eventDemo.libs.event.projection.ProjectionSnapshotRepositoryInRedis
+import eventDemo.libs.event.projection.SnapshotConfig
+import kotlinx.serialization.json.Json
+import redis.clients.jedis.UnifiedJedis
+
+/**
+ * Manages [projections][GameState], their building and publication in the [bus][GameProjectionBus].
+ */
+class GameStateRepositoryInRedis(
+  eventStore: GameEventStore,
+  projectionBus: GameProjectionBus,
+  eventBus: GameEventBus,
+  jedis: UnifiedJedis,
+  snapshotConfig: SnapshotConfig = SnapshotConfig(),
+) : GameStateRepository {
+  private val projectionsSnapshot =
+    ProjectionSnapshotRepositoryInRedis(
+      eventStore = eventStore,
+      snapshotCacheConfig = snapshotConfig,
+      initialStateBuilder = { aggregateId: GameId -> GameState(aggregateId) },
+      projectionClass = GameState::class,
+      projectionToJson = { Json.encodeToString(GameState.serializer(), it) },
+      jsonToProjection = { Json.decodeFromString(GameState.serializer(), it) },
+      applyToProjection = GameState::apply,
+      jedis = jedis,
+    )
+
+  init {
+    // On new event was received, build snapshot and publish it to the projection bus
+    eventBus.subscribe { event ->
+      projectionsSnapshot
+        .applyAndPutToCache(event)
+        .also { projectionBus.publish(it) }
+    }
+  }
+
+  /**
+   * Get the last version of the [GameState] from the all eventStream.
+   *
+   * It fetches it from the local cache if possible, otherwise it builds it.
+   */
+  override fun getLast(gameId: GameId): GameState =
+    projectionsSnapshot.getLast(gameId)
+
+  /**
+   * Get the [GameState] to the specific [event][GameEvent].
+   * It does not contain the [events][GameEvent] it after this one.
+   *
+   * It fetches it from the local cache if possible, otherwise it builds it.
+   */
+  override fun getUntil(event: GameEvent): GameState =
+    projectionsSnapshot.getUntil(event)
+}

src/main/kotlin/eventDemo/business/event/event/CardIsPlayedEvent.kt

@@ -3,13 +3,16 @@ package eventDemo.business.event.event
 import eventDemo.business.entity.Card
 import eventDemo.business.entity.GameId
 import eventDemo.business.entity.Player
+import eventDemo.configuration.serializer.UUIDSerializer
 import kotlinx.datetime.Clock
 import kotlinx.datetime.Instant
+import kotlinx.serialization.Serializable
 import java.util.UUID
 
 /**
  * An [GameEvent] to represent a played card.
  */
+@Serializable
 data class CardIsPlayedEvent(
   override val aggregateId: GameId,
   val card: Card,
@@ -17,6 +20,7 @@ data class CardIsPlayedEvent(
   override val version: Int,
 ) : GameEvent,
   PlayerActionEvent {
+  @Serializable(with = UUIDSerializer::class)
   override val eventId: UUID = UUID.randomUUID()
   override val createdAt: Instant = Clock.System.now()
 }

src/main/kotlin/eventDemo/business/event/event/GameStartedEvent.kt

@@ -4,19 +4,23 @@ import eventDemo.business.entity.Deck
 import eventDemo.business.entity.GameId
 import eventDemo.business.entity.Player
 import eventDemo.business.entity.initHands
+import eventDemo.configuration.serializer.UUIDSerializer
 import kotlinx.datetime.Clock
 import kotlinx.datetime.Instant
+import kotlinx.serialization.Serializable
 import java.util.UUID
 
 /**
  * This [GameEvent] is sent when all players are ready.
  */
+@Serializable
 data class GameStartedEvent(
   override val aggregateId: GameId,
   val firstPlayer: Player,
   val deck: Deck,
   override val version: Int,
 ) : GameEvent {
+  @Serializable(with = UUIDSerializer::class)
   override val eventId: UUID = UUID.randomUUID()
   override val createdAt: Instant = Clock.System.now()
 

src/main/kotlin/eventDemo/business/event/event/NewPlayerEvent.kt

@@ -2,18 +2,22 @@ package eventDemo.business.event.event
 
 import eventDemo.business.entity.GameId
 import eventDemo.business.entity.Player
+import eventDemo.configuration.serializer.UUIDSerializer
 import kotlinx.datetime.Clock
 import kotlinx.datetime.Instant
+import kotlinx.serialization.Serializable
 import java.util.UUID
 
 /**
  * An [GameEvent] to represent a new player joining the game.
  */
+@Serializable
 data class NewPlayerEvent(
   override val aggregateId: GameId,
   val player: Player,
   override val version: Int,
 ) : GameEvent {
+  @Serializable(with = UUIDSerializer::class)
   override val eventId: UUID = UUID.randomUUID()
   override val createdAt: Instant = Clock.System.now()
 }

src/main/kotlin/eventDemo/business/event/event/PlayerActionEvent.kt

@@ -1,7 +1,9 @@
 package eventDemo.business.event.event
 
 import eventDemo.business.entity.Player
+import kotlinx.serialization.Serializable
 
+@Serializable
 sealed interface PlayerActionEvent : GameEvent {
   val player: Player
 }

src/main/kotlin/eventDemo/business/event/event/PlayerChoseColorEvent.kt

@@ -3,13 +3,16 @@ package eventDemo.business.event.event
 import eventDemo.business.entity.Card
 import eventDemo.business.entity.GameId
 import eventDemo.business.entity.Player
+import eventDemo.configuration.serializer.UUIDSerializer
 import kotlinx.datetime.Clock
 import kotlinx.datetime.Instant
+import kotlinx.serialization.Serializable
 import java.util.UUID
 
 /**
  * This [GameEvent] is sent when a player chose a color.
  */
+@Serializable
 data class PlayerChoseColorEvent(
   override val aggregateId: GameId,
   override val player: Player,
@@ -17,6 +20,7 @@ data class PlayerChoseColorEvent(
   override val version: Int,
 ) : GameEvent,
   PlayerActionEvent {
+  @Serializable(with = UUIDSerializer::class)
   override val eventId: UUID = UUID.randomUUID()
   override val createdAt: Instant = Clock.System.now()
 }

src/main/kotlin/eventDemo/business/event/event/PlayerHavePassEvent.kt

@@ -3,13 +3,16 @@ package eventDemo.business.event.event
 import eventDemo.business.entity.Card
 import eventDemo.business.entity.GameId
 import eventDemo.business.entity.Player
+import eventDemo.configuration.serializer.UUIDSerializer
 import kotlinx.datetime.Clock
 import kotlinx.datetime.Instant
+import kotlinx.serialization.Serializable
 import java.util.UUID
 
 /**
  * This [GameEvent] is sent when a player can play.
  */
+@Serializable
 data class PlayerHavePassEvent(
   override val aggregateId: GameId,
   override val player: Player,
@@ -17,6 +20,7 @@ data class PlayerHavePassEvent(
   override val version: Int,
 ) : GameEvent,
   PlayerActionEvent {
+  @Serializable(with = UUIDSerializer::class)
   override val eventId: UUID = UUID.randomUUID()
   override val createdAt: Instant = Clock.System.now()
 }

src/main/kotlin/eventDemo/business/event/event/PlayerReadyEvent.kt

@@ -2,18 +2,22 @@ package eventDemo.business.event.event
 
 import eventDemo.business.entity.GameId
 import eventDemo.business.entity.Player
+import eventDemo.configuration.serializer.UUIDSerializer
 import kotlinx.datetime.Clock
 import kotlinx.datetime.Instant
+import kotlinx.serialization.Serializable
 import java.util.UUID
 
 /**
  * This [GameEvent] is sent when a player is ready.
  */
+@Serializable
 data class PlayerReadyEvent(
   override val aggregateId: GameId,
   val player: Player,
   override val version: Int,
 ) : GameEvent {
+  @Serializable(with = UUIDSerializer::class)
   override val eventId: UUID = UUID.randomUUID()
   override val createdAt: Instant = Clock.System.now()
 }

src/main/kotlin/eventDemo/business/event/event/PlayerWinEvent.kt

@@ -2,18 +2,22 @@ package eventDemo.business.event.event
 
 import eventDemo.business.entity.GameId
 import eventDemo.business.entity.Player
+import eventDemo.configuration.serializer.UUIDSerializer
 import kotlinx.datetime.Clock
 import kotlinx.datetime.Instant
+import kotlinx.serialization.Serializable
 import java.util.UUID
 
 /**
  * This [GameEvent] is sent when a player is ready.
  */
+@Serializable
 data class PlayerWinEvent(
   override val aggregateId: GameId,
   val player: Player,
   override val version: Int,
 ) : GameEvent {
+  @Serializable(with = UUIDSerializer::class)
   override val eventId: UUID = UUID.randomUUID()
   override val createdAt: Instant = Clock.System.now()
 }

src/main/kotlin/eventDemo/configuration/injection/ConfigureDIInfrastructure.kt

@@ -4,41 +4,22 @@ import eventDemo.adapter.infrastructureLayer.event.GameEventBusInMemory
 import eventDemo.adapter.infrastructureLayer.event.GameEventStoreInMemory
 import eventDemo.adapter.infrastructureLayer.event.projection.GameListRepositoryInMemory
 import eventDemo.adapter.infrastructureLayer.event.projection.GameProjectionBusInMemory
-import eventDemo.adapter.infrastructureLayer.event.projection.GameStateRepositoryInMemory
+import eventDemo.adapter.infrastructureLayer.event.projection.GameStateRepositoryInRedis
 import eventDemo.business.event.GameEventBus
 import eventDemo.business.event.GameEventStore
 import eventDemo.business.event.projection.GameProjectionBus
 import eventDemo.business.event.projection.gameList.GameListRepository
 import eventDemo.business.event.projection.gameState.GameStateRepository
 import eventDemo.libs.event.projection.SnapshotConfig
-import kotlinx.serialization.KSerializer
-import kotlinx.serialization.json.Json
-import kotlinx.serialization.serializer
 import org.koin.core.module.Module
 import org.koin.core.module.dsl.singleOf
 import org.koin.dsl.bind
 import redis.clients.jedis.JedisPooled
 import redis.clients.jedis.UnifiedJedis
-import redis.clients.jedis.json.JsonObjectMapper
 
 fun Module.configureDIInfrastructure(redisUrl: String) {
   factory {
-    JedisPooled(redisUrl).apply {
-      setJsonObjectMapper(
-        object : JsonObjectMapper {
-          override fun <T> fromJson(
-            value: String,
-            valueType: Class<T>,
-          ): T {
-            val s: KSerializer<T> = serializer(valueType) as KSerializer<T>
-            return Json.decodeFromString(s, value)
-          }
-
-          override fun toJson(value: Any): String =
-            Json.encodeToString(value)
-        },
-      )
-    }
+    JedisPooled(redisUrl)
   } bind UnifiedJedis::class
 
   singleOf(::GameEventBusInMemory) bind GameEventBus::class
@@ -46,7 +27,7 @@ fun Module.configureDIInfrastructure(redisUrl: String) {
   singleOf(::GameProjectionBusInMemory) bind GameProjectionBus::class
 
   single {
-    GameStateRepositoryInMemory(get(), get(), get(), snapshotConfig = SnapshotConfig())
+    GameStateRepositoryInRedis(get(), get(), get(), get(), snapshotConfig = SnapshotConfig())
   } bind GameStateRepository::class
 
   single {

src/main/kotlin/eventDemo/libs/event/projection/ProjectionSnapshotRepositoryInRedis.kt

@@ -61,7 +61,8 @@ class ProjectionSnapshotRepositoryInRedis<E : Event<ID>, P : Projection<ID>, ID
   override fun getLast(aggregateId: ID): P =
     jedis
       .get(projectionClass.redisKeyLatest(aggregateId))
-      .let(jsonToProjection)
+      ?.let(jsonToProjection)
+      ?: initialStateBuilder(aggregateId)
 
   /**
    * Build the [Projection] to the specific [event][Event].

src/test/kotlin/eventDemo/adapter/interfaceLayer/query/GameSimulationTest.kt

@@ -22,12 +22,12 @@ import eventDemo.business.notification.PlayerAsPlayACardNotification
 import eventDemo.business.notification.PlayerWasReadyNotification
 import eventDemo.business.notification.TheGameWasStartedNotification
 import eventDemo.business.notification.WelcomeToTheGameNotification
+import eventDemo.configuration.injection.Configuration
 import eventDemo.configuration.injection.appKoinModule
 import eventDemo.libs.event.projection.ProjectionSnapshotRepositoryInMemory
 import io.kotest.core.spec.style.FunSpec
 import io.kotest.matchers.collections.shouldHaveSize
 import io.kotest.matchers.equals.shouldBeEqual
-import io.mockk.mockk
 import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
@@ -171,7 +171,7 @@ class GameSimulationTest :
             }
           }
 
-        koinApplication { modules(appKoinModule(mockk(relaxed = true))) }.koin.apply {
+        koinApplication { modules(appKoinModule(Configuration("redis://localhost:6379"))) }.koin.apply {
           val commandHandler by inject<GameCommandHandler>()
           val eventStore by inject<GameEventStore>()
           val playerNotificationListener by inject<PlayerNotificationListener>()

src/test/kotlin/eventDemo/business/command/GameCommandHandlerTest.kt

@@ -9,53 +9,57 @@ import eventDemo.business.event.projection.projectionListener.ReactionListener
 import eventDemo.business.notification.CommandSuccessNotification
 import eventDemo.business.notification.Notification
 import eventDemo.business.notification.WelcomeToTheGameNotification
+import eventDemo.configuration.injection.Configuration
 import eventDemo.configuration.injection.appKoinModule
 import io.kotest.core.spec.style.FunSpec
 import io.kotest.matchers.collections.shouldContain
 import io.kotest.matchers.equals.shouldBeEqual
-import io.mockk.mockk
 import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.channels.trySendBlocking
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withTimeout
 import org.koin.dsl.koinApplication
 import kotlin.test.assertIs
+import kotlin.time.Duration.Companion.seconds
 
 @OptIn(DelicateCoroutinesApi::class)
 class GameCommandHandlerTest :
   FunSpec({
     test("handle a command should execute the command") {
-      koinApplication { modules(appKoinModule(mockk(relaxed = true))) }.koin.apply {
-        val commandHandler by inject<GameCommandHandler>()
-        val notificationListener by inject<PlayerNotificationListener>()
-        val gameId = GameId()
-        val player = Player("Tesla")
-        val channelCommand = Channel<GameCommand>(Channel.BUFFERED)
-        val channelNotification = Channel<Notification>(Channel.BUFFERED)
-        ReactionListener(get(), get()).init()
-        notificationListener.startListening(
-          player,
-          gameId,
-        ) { channelNotification.trySendBlocking(it) }
-
-        GlobalScope.launch {
-          commandHandler.handle(
+      withTimeout(1.seconds) {
+        koinApplication { modules(appKoinModule(Configuration("redis://localhost:6379"))) }.koin.apply {
+          val commandHandler by inject<GameCommandHandler>()
+          val notificationListener by inject<PlayerNotificationListener>()
+          val gameId = GameId()
+          val player = Player("Tesla")
+          val channelCommand = Channel<GameCommand>(Channel.BUFFERED)
+          val channelNotification = Channel<Notification>(Channel.BUFFERED)
+          ReactionListener(get(), get()).init()
+          notificationListener.startListening(
             player,
             gameId,
-            channelCommand,
-            channelNotification,
-          )
-        }
+          ) { channelNotification.trySendBlocking(it) }
 
-        IWantToJoinTheGameCommand(IWantToJoinTheGameCommand.Payload(gameId, player)).also { sendCommand ->
-          channelCommand.send(sendCommand)
-          channelNotification.receive().let {
-            assertIs<CommandSuccessNotification>(it).commandId shouldBeEqual sendCommand.id
+          GlobalScope.launch {
+            commandHandler.handle(
+              player,
+              gameId,
+              channelCommand,
+              channelNotification,
+            )
+          }
+
+          IWantToJoinTheGameCommand(IWantToJoinTheGameCommand.Payload(gameId, player)).also { sendCommand ->
+            channelCommand.send(sendCommand)
+            channelNotification.receive().let {
+              assertIs<CommandSuccessNotification>(it).commandId shouldBeEqual sendCommand.id
+            }
+          }
+          assertIs<WelcomeToTheGameNotification>(channelNotification.receive()).let {
+            it.players shouldContain player
           }
-        }
-        assertIs<WelcomeToTheGameNotification>(channelNotification.receive()).let {
-          it.players shouldContain player
         }
       }
     }

src/test/kotlin/eventDemo/business/event/projection/GameStateRepositoryTest.kt

@@ -5,11 +5,11 @@ import eventDemo.business.entity.Player
 import eventDemo.business.event.GameEventHandler
 import eventDemo.business.event.event.NewPlayerEvent
 import eventDemo.business.event.projection.gameState.GameStateRepository
+import eventDemo.configuration.injection.Configuration
 import eventDemo.configuration.injection.appKoinModule
 import io.kotest.core.spec.style.FunSpec
 import io.kotest.matchers.collections.shouldHaveSize
 import io.kotest.matchers.equals.shouldBeEqual
-import io.mockk.mockk
 import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.joinAll
@@ -26,7 +26,7 @@ class GameStateRepositoryTest :
 
     test("GameStateRepository should build the projection when a new event occurs") {
       val aggregateId = GameId()
-      koinApplication { modules(appKoinModule(mockk(relaxed = true))) }.koin.apply {
+      koinApplication { modules(appKoinModule(Configuration("redis://localhost:6379"))) }.koin.apply {
         val repo = get<GameStateRepository>()
         val eventHandler = get<GameEventHandler>()
         eventHandler
@@ -45,7 +45,7 @@ class GameStateRepositoryTest :
 
     test("get should build the last version of the state") {
       val aggregateId = GameId()
-      koinApplication { modules(appKoinModule(mockk(relaxed = true))) }.koin.apply {
+      koinApplication { modules(appKoinModule(Configuration("redis://localhost:6379"))) }.koin.apply {
         val repo = get<GameStateRepository>()
         val eventHandler = get<GameEventHandler>()
 
@@ -70,7 +70,7 @@ class GameStateRepositoryTest :
     test("getUntil should build the state until the event") {
       repeat(10) {
         val aggregateId = GameId()
-        koinApplication { modules(appKoinModule(mockk(relaxed = true))) }.koin.apply {
+        koinApplication { modules(appKoinModule(Configuration("redis://localhost:6379"))) }.koin.apply {
           val repo = get<GameStateRepository>()
           val eventHandler = get<GameEventHandler>()
 
@@ -99,7 +99,7 @@ class GameStateRepositoryTest :
 
     test("getUntil should be concurrently secure") {
       val aggregateId = GameId()
-      koinApplication { modules(appKoinModule(mockk(relaxed = true))) }.koin.apply {
+      koinApplication { modules(appKoinModule(Configuration("redis://localhost:6379"))) }.koin.apply {
         val repo = get<GameStateRepository>()
         val eventHandler = get<GameEventHandler>()