Implement first routes & tests

install Koin
install kotest
declare first events
create EventStream

src/main/kotlin/eventDemo/app/EventStream.kt

@@ -0,0 +1,27 @@
+package eventDemo.app
+
+import io.github.oshai.kotlinlogging.KotlinLogging
+
+class EventStream<ID : AggregateId> {
+    private val logger = KotlinLogging.logger {}
+    private val eventBus: MutableMap<ID, MutableList<Event<ID>>> = mutableMapOf()
+
+    fun publish(event: Event<ID>) {
+        eventBus.getOrPut(event.aggregateId) { mutableListOf() }.add(event)
+        logger.atInfo {
+            message = "Event published"
+            payload = mapOf("event" to event)
+        }
+    }
+
+    fun <U : Event<ID>> read(
+        aggregateId: ID,
+        eventClass: Class<U>,
+    ): U? {
+        return eventBus.get(aggregateId)?.filterIsInstance(eventClass)?.firstOrNull()
+    }
+}
+
+inline fun <reified U : Event<ID>, ID : AggregateId> EventStream<ID>.read(aggregateId: ID): U? {
+    return this.read(aggregateId, U::class.java)
+}