report about invalid global settings

levkhomich · Dec 23, 2014 · 6ca3e99 · 6ca3e99
1 parent 89f7658
commit 6ca3e99
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/play/src/main/scala/com/github/levkhomich/akka/tracing/play/PlayActorTracing.scala b/play/src/main/scala/com/github/levkhomich/akka/tracing/play/PlayActorTracing.scala
@@ -34,7 +34,14 @@ trait PlayActorTracing extends ActorTracing { self: Actor =>
 class PlayRequestTracingSupport(val headers: RequestHeader) extends AnyVal with BaseTracingSupport {
 
   override private[tracing] def $spanId: Long =
-    headers.tags.get(TracingHeaders.SpanId).map(java.lang.Long.parseLong(_)).get
+    headers.tags.get(TracingHeaders.SpanId).map(java.lang.Long.parseLong(_)) match {
+      case Some(spanId) =>
+        spanId
+      case _ =>
+        throw new IllegalStateException(
+          "Traced request was not properly tagged. Probably, TracingSettings was not mixed into global Play config."
+        )
+    }
 
   override private[tracing] def sample(): Unit = {}