Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/7471#discussion_r35051130
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/receiver/Receiver.scala ---
@@ -271,7 +271,7 @@ abstract class Receiver[T](val storageLevel:
StorageLevel) extends Serializable
}
/** Get the attached executor. */
- private def executor = {
+ private[streaming] def executor = {
--- End diff --
Aah, I see. The reason I wanted to use PrivateTest is because marking
private[streaming] make it invisible through Scala compilation, but its visibly
publicly in the bytecode, and therefore through Java. And since Receivers can
be written in Java, I dont want to expose that. PrivateTester wont work, but
the underlying mechanism will working using reflection.
```
scala> abstract class A { private val i = 1 }
defined class A
scala> class B extends A
defined class B
scala> B.getClass().getSuperclass()
<console>:8: error: not found: value B
B.getClass().getSuperclass()
^
scala> classOf[B].getSuperclass()
res1: Class[_ >: B] = class A
scala> classOf[B].getSuperclass().getDeclaredFields()
res2: Array[java.lang.reflect.Field] = Array(private final int A.i)
scala> val f = classOf[B].getSuperclass().getDeclaredFields().head
f: java.lang.reflect.Field = private final int A.i
scala> f.setAccessible(true)
scala> f.get(new B)
res4: Object = 1
```
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