create GameListRepositoryInRedis

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

@@ -0,0 +1,57 @@
+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.projection.GameProjectionBus
+import eventDemo.business.event.projection.gameList.GameList
+import eventDemo.business.event.projection.gameList.GameListRepository
+import eventDemo.business.event.projection.gameList.apply
+import eventDemo.business.event.projection.gameState.GameState
+import eventDemo.libs.event.projection.ProjectionSnapshotRepositoryInRedis
+import eventDemo.libs.event.projection.SnapshotConfig
+import io.github.oshai.kotlinlogging.withLoggingContext
+import kotlinx.serialization.json.Json
+import redis.clients.jedis.UnifiedJedis
+
+/**
+ * Manages [projections][GameList], their building and publication in the [bus][GameProjectionBus].
+ */
+class GameListRepositoryInRedis(
+  eventStore: GameEventStore,
+  jedis: UnifiedJedis,
+  snapshotConfig: SnapshotConfig = SnapshotConfig(),
+) : GameListRepository {
+  private val projectionsSnapshot =
+    ProjectionSnapshotRepositoryInRedis(
+      eventStore = eventStore,
+      snapshotCacheConfig = snapshotConfig,
+      initialStateBuilder = { aggregateId: GameId -> GameList(aggregateId) },
+      projectionClass = GameList::class,
+      projectionToJson = { Json.encodeToString(GameList.serializer(), it) },
+      jsonToProjection = { Json.decodeFromString(GameList.serializer(), it) },
+      applyToProjection = GameList::apply,
+      jedis = jedis,
+    )
+
+  fun subscribeToBus(
+    projectionBus: GameProjectionBus,
+    eventBus: GameEventBus,
+  ) {
+    eventBus.subscribe { event ->
+      withLoggingContext("event" to event.toString()) {
+        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 getList(): List<GameList> =
+    projectionsSnapshot.getList()
+}

src/main/kotlin/eventDemo/configuration/Configure.kt

@@ -10,6 +10,7 @@ import eventDemo.configuration.route.declareHttpGameRoute
 import eventDemo.configuration.route.declareWebSocketsGameRoute
 import io.ktor.server.application.Application
 import org.koin.ktor.ext.get
+import org.koin.ktor.ext.getKoin
 
 fun Application.configure() {
   configureKoin()
@@ -24,5 +25,5 @@ fun Application.configure() {
   configureHttpRouting()
   declareHttpGameRoute()
 
-  configureGameListener()
+  getKoin().configureGameListener()
 }

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

@@ -4,7 +4,7 @@ import com.zaxxer.hikari.HikariConfig
 import com.zaxxer.hikari.HikariDataSource
 import eventDemo.adapter.infrastructureLayer.event.GameEventBusInMemory
 import eventDemo.adapter.infrastructureLayer.event.GameEventStoreInPostgresql
-import eventDemo.adapter.infrastructureLayer.event.projection.GameListRepositoryInMemory
+import eventDemo.adapter.infrastructureLayer.event.projection.GameListRepositoryInRedis
 import eventDemo.adapter.infrastructureLayer.event.projection.GameProjectionBusInMemory
 import eventDemo.adapter.infrastructureLayer.event.projection.GameStateRepositoryInRedis
 import eventDemo.business.event.GameEventBus
@@ -21,7 +21,7 @@ import redis.clients.jedis.UnifiedJedis
 import javax.sql.DataSource
 
 fun Module.configureDIInfrastructure(config: Configuration) {
-  factory {
+  single {
     JedisPooled(config.redisUrl)
   } bind UnifiedJedis::class
 
@@ -47,6 +47,6 @@ fun Module.configureDIInfrastructure(config: Configuration) {
   } bind GameStateRepository::class
 
   single {
-    GameListRepositoryInMemory(get(), get(), get(), snapshotConfig = SnapshotConfig())
+    GameListRepositoryInRedis(get(), get(), snapshotConfig = SnapshotConfig())
   } bind GameListRepository::class
 }

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

@@ -7,6 +7,7 @@ import eventDemo.libs.toRanges
 import io.github.oshai.kotlinlogging.KotlinLogging
 import io.github.oshai.kotlinlogging.withLoggingContext
 import redis.clients.jedis.UnifiedJedis
+import redis.clients.jedis.params.ScanParams
 import redis.clients.jedis.params.SortingParams
 import kotlin.reflect.KClass
 
@@ -55,13 +56,16 @@ class ProjectionSnapshotRepositoryInRedis<E : Event<ID>, P : Projection<ID>, ID
     offset: Int,
   ): List<P> =
     jedis
-      .sort(
-        projectionClass.redisKeySearchList,
-        SortingParams()
-          .desc()
-          .by("score")
-          .limit(limit, offset),
-      ).map { jsonToProjection(it) }
+      .scan(
+        offset.toString(),
+        ScanParams()
+          .match(projectionClass.redisKeySearchList)
+          .count(limit),
+      ).result
+      .mapNotNull { key ->
+        getLastByKey(key)
+          ?.let(jsonToProjection)
+      }
 
   /**
    * Get the last version of the [Projection] from the cache.
@@ -71,16 +75,19 @@ class ProjectionSnapshotRepositoryInRedis<E : Event<ID>, P : Projection<ID>, ID
    * 3. apply the missing events to the snapshot
    */
   override fun getLast(aggregateId: ID): P =
+    getLastByKey(projectionClass.redisKey(aggregateId))
+      ?.let(jsonToProjection)
+      ?: initialStateBuilder(aggregateId)
+
+  private fun getLastByKey(key: String): String? =
     jedis
       .sort(
-        projectionClass.redisKey(aggregateId),
+        key,
         SortingParams()
           .desc()
           .by("score")
           .limit(0, 1),
       ).firstOrNull()
-      ?.let(jsonToProjection)
-      ?: initialStateBuilder(aggregateId)
 
   /**
    * Build the [Projection] to the specific [event][Event].