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].