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package kamon.instrumentation
import org.aspectj.lang.annotation._
import kamon.{Tracer, TraceContext}
import org.aspectj.lang.ProceedingJoinPoint
import scala.Some
/**
* Marker interface, just to make sure we don't instrument all the Runnables in the classpath.
*/
trait TraceContextAwareRunnable {
def traceContext: Option[TraceContext]
}
@Aspect
class RunnableInstrumentation {
/**
* These are the Runnables that need to be instrumented and make the TraceContext available
* while their run method is executed.
*/
@DeclareMixin("scala.concurrent.impl.CallbackRunnable || scala.concurrent.impl.Future.PromiseCompletingRunnable")
def onCompleteCallbacksRunnable: TraceContextAwareRunnable = new TraceContextAwareRunnable {
val traceContext: Option[TraceContext] = Tracer.traceContext.value
}
/**
* Pointcuts
*/
@Pointcut("execution(kamon.instrumentation.TraceContextAwareRunnable+.new(..)) && this(runnable)")
def instrumentedRunnableCreation(runnable: TraceContextAwareRunnable): Unit = {}
@Pointcut("execution(* kamon.instrumentation.TraceContextAwareRunnable+.run()) && this(runnable)")
def runnableExecution(runnable: TraceContextAwareRunnable) = {}
@After("instrumentedRunnableCreation(runnable)")
def beforeCreation(runnable: TraceContextAwareRunnable) = {
// Force traceContext initialization.
runnable.traceContext
}
@Around("runnableExecution(runnable)")
def around(pjp: ProceedingJoinPoint, runnable: TraceContextAwareRunnable): Any = {
import pjp._
Tracer.traceContext.withValue(runnable.traceContext) {
proceed()
}
}
}
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