Projection was now built on listener events

Create ProjectionBus and use it with listeners
add EventStream::getByVersion

src/main/kotlin/eventDemo/adapter/infrastructureLayer/event/GameEventBusInMemory.kt

@@ -4,7 +4,14 @@ import eventDemo.business.event.GameEventBus
 import eventDemo.business.event.event.GameEvent
 import eventDemo.libs.bus.Bus
 import eventDemo.libs.bus.BusInMemory
+import java.util.UUID
 
 class GameEventBusInMemory :
-  GameEventBus(),
-  Bus<GameEvent> by BusInMemory()
+  GameEventBus,
+  Bus<GameEvent> by BusInMemory(),
+  Comparable<GameEventBusInMemory> {
+  private val instanceId: UUID = UUID.randomUUID()
+
+  override fun compareTo(other: GameEventBusInMemory): Int =
+    compareValues(instanceId, other.instanceId)
+}

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

@@ -1,8 +1,9 @@
 package eventDemo.adapter.infrastructureLayer.event.projection
 
 import eventDemo.business.entity.GameId
-import eventDemo.business.event.GameEventHandler
+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
@@ -10,9 +11,13 @@ import eventDemo.business.event.projection.gameState.GameState
 import eventDemo.libs.event.projection.ProjectionSnapshotRepositoryInMemory
 import eventDemo.libs.event.projection.SnapshotConfig
 
+/**
+ * Manages [projections][GameList], their building and publication in the [bus][GameProjectionBus].
+ */
 class GameListRepositoryInMemory(
   eventStore: GameEventStore,
-  eventHandler: GameEventHandler,
+  projectionBus: GameProjectionBus,
+  eventBus: GameEventBus,
   snapshotConfig: SnapshotConfig = SnapshotConfig(),
 ) : GameListRepository {
   private val projectionsSnapshot =
@@ -24,8 +29,10 @@ class GameListRepositoryInMemory(
     )
 
   init {
-    eventHandler.registerProjectionBuilder { event ->
-      projectionsSnapshot.applyAndPutToCache(event)
+    eventBus.subscribe { event ->
+      projectionsSnapshot
+        .applyAndPutToCache(event)
+        .also { projectionBus.publish(it) }
     }
   }
 

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

@@ -0,0 +1,18 @@
+package eventDemo.adapter.infrastructureLayer.event.projection
+
+import eventDemo.business.entity.GameId
+import eventDemo.business.event.projection.GameProjectionBus
+import eventDemo.libs.bus.Bus
+import eventDemo.libs.bus.BusInMemory
+import eventDemo.libs.event.projection.Projection
+import java.util.UUID
+
+class GameProjectionBusInMemory :
+  GameProjectionBus,
+  Bus<Projection<GameId>> by BusInMemory(),
+  Comparable<GameProjectionBusInMemory> {
+  private val instanceId: UUID = UUID.randomUUID()
+
+  override fun compareTo(other: GameProjectionBusInMemory): Int =
+    compareValues(instanceId, other.instanceId)
+}

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

@@ -1,18 +1,23 @@
 package eventDemo.adapter.infrastructureLayer.event.projection
 
 import eventDemo.business.entity.GameId
-import eventDemo.business.event.GameEventHandler
+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.ProjectionSnapshotRepositoryInMemory
 import eventDemo.libs.event.projection.SnapshotConfig
 
+/**
+ * Manages [projections][GameState], their building and publication in the [bus][GameProjectionBus].
+ */
 class GameStateRepositoryInMemory(
   eventStore: GameEventStore,
-  eventHandler: GameEventHandler,
+  projectionBus: GameProjectionBus,
+  eventBus: GameEventBus,
   snapshotConfig: SnapshotConfig = SnapshotConfig(),
 ) : GameStateRepository {
   private val projectionsSnapshot =
@@ -24,8 +29,11 @@ class GameStateRepositoryInMemory(
     )
 
   init {
-    eventHandler.registerProjectionBuilder { event ->
-      projectionsSnapshot.applyAndPutToCache(event)
+    // On new event was received, build snapshot and publish it to the projection bus
+    eventBus.subscribe { event ->
+      projectionsSnapshot
+        .applyAndPutToCache(event)
+        .also { projectionBus.publish(it) }
     }
   }