1 files changed, 18 insertions, 0 deletions
diff --git a/src/main/scala/xyz/driver/core/rest/ServiceDiscovery.scala b/src/main/scala/xyz/driver/core/rest/ServiceDiscovery.scala
index f0f3b5b..5f589a9 100644
--- a/src/main/scala/xyz/driver/core/rest/ServiceDiscovery.scala
+++ b/src/main/scala/xyz/driver/core/rest/ServiceDiscovery.scala
@@ -6,3 +6,21 @@ trait ServiceDiscovery {
 
   def discover[T <: Service](serviceName: Name[Service]): T
 }
+
+object ServiceDiscovery {
+  trait SavingUsedServiceDiscovery {
+    private val usedServices = new scala.collection.mutable.HashSet[String]()
+
+    def saveServiceUsage(serviceName: Name[Service]): Unit = usedServices.synchronized {
+      usedServices += serviceName.value
+    }
+
+    def getUsedServices: Set[String] = usedServices.synchronized { usedServices.toSet }
+  }
+
+  class NoServiceDiscovery extends ServiceDiscovery with SavingUsedServiceDiscovery {
+
+    def discover[T <: Service](serviceName: Name[Service]): T =
+      throw new IllegalArgumentException(s"Service with name $serviceName is unknown")
+  }
+}