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)
+}