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Always use the internal same thread execution context impl on Scala 2.12

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This commit is contained in:
Johan Andrén 2020-03-12 17:07:34 +01:00
parent 7d790ef328
commit 779993e7c3
1 changed files with 9 additions and 17 deletions
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26
akka-actor/src/main/scala-2.13-/akka/dispatch/internal/SameThreadExecutionContext.scala
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@ -4,12 +4,10 @@
package akka.dispatch.internal
import akka.actor.ReflectiveDynamicAccess
import akka.annotation.InternalApi
import akka.dispatch.BatchingExecutor
import scala.concurrent.ExecutionContext
import scala.util.control.NonFatal
/**
* Factory to create same thread ec. Not intended to be called from any other site than to create [[akka.dispatch.ExecutionContexts#parasitic]]
@ -18,20 +16,14 @@ import scala.util.control.NonFatal
*/
@InternalApi
private[dispatch] object SameThreadExecutionContext {
def apply(): ExecutionContext = {
try {
// we don't want to introduce a dependency on the actor system to use the same thread execution context
val dynamicAccess = new ReflectiveDynamicAccess(getClass.getClassLoader)
dynamicAccess.getObjectFor[ExecutionContext]("scala.concurrent.Future$InternalCallbackExecutor$").get
} catch {
case NonFatal(_) =>
// fallback to custom impl in case reflection is not available/possible
new ExecutionContext with BatchingExecutor {
override protected def unbatchedExecute(runnable: Runnable): Unit = runnable.run()
override protected def resubmitOnBlock: Boolean = false // No point since we execute on same thread
override def reportFailure(t: Throwable): Unit =
throw new IllegalStateException("exception in sameThreadExecutionContext", t)
}
}
private val sameThread = new ExecutionContext with BatchingExecutor {
override protected def unbatchedExecute(runnable: Runnable): Unit = runnable.run()
override protected def resubmitOnBlock: Boolean = false // No point since we execute on same thread
override def reportFailure(t: Throwable): Unit =
throw new IllegalStateException("exception in sameThreadExecutionContext", t)
}
def apply(): ExecutionContext = sameThread
}