basic separation of concerns between sub-projects

1 files changed, 31 insertions, 0 deletions

diff --git a/kamon-trace/src/main/scala/kamon/trace/instrumentation/ActorLoggingInstrumentation.scala b/kamon-trace/src/main/scala/kamon/trace/instrumentation/ActorLoggingInstrumentation.scala
new file mode 100644
index 00000000..77993cdd
--- /dev/null
+++ b/kamon-trace/src/main/scala/kamon/trace/instrumentation/ActorLoggingInstrumentation.scala
@@ -0,0 +1,31 @@
+package kamon.trace.instrumentation
+
+import org.aspectj.lang.annotation.{Around, Pointcut, DeclareMixin, Aspect}
+import org.aspectj.lang.ProceedingJoinPoint
+import org.slf4j.MDC
+import kamon.trace.{TraceContext, ContextAware, Trace}
+
+@Aspect
+class ActorLoggingInstrumentation {
+
+
+  @DeclareMixin("akka.event.Logging.LogEvent+")
+  def traceContextMixin: ContextAware = new ContextAware {
+    def traceContext: Option[TraceContext] = Trace.context()
+  }
+
+  @Pointcut("execution(* akka.event.slf4j.Slf4jLogger.withMdc(..)) && args(logSource, logEvent, logStatement)")
+  def withMdcInvocation(logSource: String, logEvent: ContextAware, logStatement: () => _): Unit = {}
+
+  @Around("withMdcInvocation(logSource, logEvent, logStatement)")
+  def putTraceContextInMDC(pjp: ProceedingJoinPoint, logSource: String, logEvent: ContextAware, logStatement: () => _): Unit = {
+    logEvent.traceContext match {
+      case Some(ctx) =>
+        MDC.put("uow", ctx.uow)
+        pjp.proceed()
+        MDC.remove("uow")
+
+      case None => pjp.proceed()
+    }
+  }
+}