Experiments about scala.actors.Actor

ActorExperiment.scala

import scala.actors.Actor._

//All `self` references to the same ActorProxy.
println(self)
Thread.sleep(1000)
println(self)
Thread.sleep(1000)
println(self)

//It terminates successfully (Scala 2.8.1.final and Scala 2.9.1.final).
self ! "Hello"
self receive { case x => println(x) }

ActorExperiments.repl-2.9.1.scala

Welcome to Scala version 2.9.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_26).
Type in expressions to have them evaluated.
Type :help for more information.

scala> import scala.actors.Actor._
import scala.actors.Actor._

scala> self
res0: scala.actors.Actor = scala.actors.ActorProxy@65370ce9

scala> self
res1: scala.actors.Actor = scala.actors.ActorProxy@15f6ae4d // Different ActorProxy is generated !!

scala> self
res2: scala.actors.Actor = scala.actors.ActorProxy@23ebe8ec

scala> self
res3: scala.actors.Actor = scala.actors.ActorProxy@16e3a921

scala> Thread.currentThread
res4: java.lang.Thread = Thread[Thread-9,5,main]

scala> Thread.currentThread
res5: java.lang.Thread = Thread[Thread-10,5,main] // res5's thread is not res4's thread !

scala> Thread.currentThread
res6: java.lang.Thread = Thread[Thread-11,5,main]

scala> Thread.currentThread
res7: java.lang.Thread = Thread[Thread-12,5,main]

scala> self ! "Hello"

scala> self receive { case x => println(x) } // It never terminates.

ActorExperiments2.repl-2.10-nightly.scala

Welcome to Scala version 2.10.0.r25900-b20111028020141 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_26).
Type in expressions to have them evaluated.
Type :help for more information.

scala> import scala.actors.Actor._
import scala.actors.Actor._

scala> self
res0: scala.actors.Actor = scala.actors.ActorProxy@5af6e15e

scala> self
res1: scala.actors.Actor = scala.actors.ActorProxy@2a8d1749

scala> self
res2: scala.actors.Actor = scala.actors.ActorProxy@5fdbe72f

scala> self
res3: scala.actors.Actor = scala.actors.ActorProxy@5290288e

scala> self ! "Hello"

scala> self receive { case x => println(x) } // It never terminates same as Scala 2.9.1.final

ActorExperiments2.repl-2.9.1.scala

Welcome to Scala version 2.9.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_26).
Type in expressions to have them evaluated.
Type :help for more information.

scala> import scala.actors.Actor._
import scala.actors.Actor._

scala> self
res0: scala.actors.Actor = scala.actors.ActorProxy@2de8396e

scala> self
res1: scala.actors.Actor = scala.actors.ActorProxy@2161fcdd

scala> { self ! "Hello"; self receive { case x => println(x) } } // It terminates successfully if they are executed in one block !
Hello

scala> { println(self); Thread.sleep(3000); println(self) }
scala.actors.ActorProxy@62b92956
scala.actors.ActorProxy@62b92956