From 10bec64595b4c1d43af0612537f7bbd3e01b29ee Mon Sep 17 00:00:00 2001
From: Philipp Haller <hallerp@gmail.com>
Date: Tue, 4 Sep 2007 13:33:58 +0000
Subject: Added receiver accessor to OutputChannel

---
 src/actors/scala/actors/Actor.scala         |  4 +++-
 src/actors/scala/actors/Channel.scala       | 24 +++++++++++++-----------
 src/actors/scala/actors/OutputChannel.scala |  8 +++++++-
 3 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/src/actors/scala/actors/Actor.scala b/src/actors/scala/actors/Actor.scala
index a7e5f123be..d4e5bd4c9c 100644
--- a/src/actors/scala/actors/Actor.scala
+++ b/src/actors/scala/actors/Actor.scala
@@ -263,7 +263,7 @@ object Actor {
  *   </li>
  * </ul>
  *
- * @version 0.9.8
+ * @version 0.9.9
  * @author Philipp Haller
  */
 trait Actor extends OutputChannel[Any] {
@@ -582,6 +582,8 @@ trait Actor extends OutputChannel[Any] {
       }
     } else sessions.head
 
+  def receiver: Actor = this
+
   private var continuation: PartialFunction[Any, Unit] = null
   private var timeoutPending = false
   // accessed in Reaction
diff --git a/src/actors/scala/actors/Channel.scala b/src/actors/scala/actors/Channel.scala
index eb3d3135a9..aa30abc528 100644
--- a/src/actors/scala/actors/Channel.scala
+++ b/src/actors/scala/actors/Channel.scala
@@ -35,19 +35,21 @@ case class ! [a](ch: Channel[a], msg: a)
  * actors. Only the actor creating an instance of a
  * <code>Channel</code> may receive from it.
  *
- * @version 0.9.8
+ * @version 0.9.9
  * @author Philipp Haller
  */
 class Channel[Msg] extends InputChannel[Msg] with OutputChannel[Msg] {
 
-  private[actors] var receiver: Actor = synchronized {
+  private var recv: Actor = {
     // basically Actor.self, but can be null
     Actor.tl.get.asInstanceOf[Actor]
   }
 
+  def receiver: Actor = recv
+
   private[actors] def this(recv: Actor) = {
     this()
-    receiver = recv
+    this.recv = recv
   }
 
   /**
@@ -56,7 +58,7 @@ class Channel[Msg] extends InputChannel[Msg] with OutputChannel[Msg] {
    * @param  msg the message to be sent
    */
   def !(msg: Msg) {
-    receiver ! scala.actors.!(this, msg)
+    recv ! scala.actors.!(this, msg)
   }
 
   /**
@@ -64,7 +66,7 @@ class Channel[Msg] extends InputChannel[Msg] with OutputChannel[Msg] {
    * last sender as sender instead of <code>self</code>.
    */
   def forward(msg: Msg) {
-    receiver forward scala.actors.!(this, msg)
+    recv forward scala.actors.!(this, msg)
   }
 
   /**
@@ -75,7 +77,7 @@ class Channel[Msg] extends InputChannel[Msg] with OutputChannel[Msg] {
    */
   def receive[R](f: PartialFunction[Msg, R]): R = {
     val C = this.asInstanceOf[Channel[Any]]
-    receiver.receive {
+    recv.receive {
       case C ! msg if (f.isDefinedAt(msg.asInstanceOf[Msg])) => f(msg.asInstanceOf[Msg])
     }
   }
@@ -97,7 +99,7 @@ class Channel[Msg] extends InputChannel[Msg] with OutputChannel[Msg] {
    */
   def receiveWithin[R](msec: Long)(f: PartialFunction[Any, R]): R = {
     val C = this.asInstanceOf[Channel[Any]]
-    receiver.receiveWithin(msec) {
+    recv.receiveWithin(msec) {
       case C ! msg if (f.isDefinedAt(msg)) => f(msg)
       case TIMEOUT => f(TIMEOUT)
     }
@@ -113,7 +115,7 @@ class Channel[Msg] extends InputChannel[Msg] with OutputChannel[Msg] {
    */
   def react(f: PartialFunction[Msg, Unit]): Nothing = {
     val C = this.asInstanceOf[Channel[Any]]
-    receiver.react {
+    recv.react {
       case C ! msg if (f.isDefinedAt(msg.asInstanceOf[Msg])) => f(msg.asInstanceOf[Msg])
     }
   }
@@ -130,7 +132,7 @@ class Channel[Msg] extends InputChannel[Msg] with OutputChannel[Msg] {
    */
   def reactWithin(msec: Long)(f: PartialFunction[Any, Unit]): Nothing = {
     val C = this.asInstanceOf[Channel[Any]]
-    receiver.reactWithin(msec) {
+    recv.reactWithin(msec) {
       case C ! msg if (f.isDefinedAt(msg)) => f(msg)
       case TIMEOUT => f(TIMEOUT)
     }
@@ -145,7 +147,7 @@ class Channel[Msg] extends InputChannel[Msg] with OutputChannel[Msg] {
    */
   def !?(msg: Msg): Any = {
     val replyCh = Actor.self.freshReplyChannel
-    receiver.send(scala.actors.!(this, msg), replyCh)
+    recv.send(scala.actors.!(this, msg), replyCh)
     replyCh.receive {
       case x => x
     }
@@ -162,7 +164,7 @@ class Channel[Msg] extends InputChannel[Msg] with OutputChannel[Msg] {
    */
   def !?(msec: Long, msg: Msg): Option[Any] = {
     val replyCh = Actor.self.freshReplyChannel
-    receiver.send(scala.actors.!(this, msg), replyCh)
+    recv.send(scala.actors.!(this, msg), replyCh)
     replyCh.receiveWithin(msec) {
       case TIMEOUT => None
       case x => Some(x)
diff --git a/src/actors/scala/actors/OutputChannel.scala b/src/actors/scala/actors/OutputChannel.scala
index 83e190f638..58106f86c2 100644
--- a/src/actors/scala/actors/OutputChannel.scala
+++ b/src/actors/scala/actors/OutputChannel.scala
@@ -14,7 +14,7 @@ package scala.actors
  * The <code>OutputChannel</code> trait provides a common interface
  * for all channels to which values can be sent.
  *
- * @version 0.9.8
+ * @version 0.9.9
  * @author Philipp Haller
  */
 trait OutputChannel[Msg] {
@@ -30,4 +30,10 @@ trait OutputChannel[Msg] {
    * <code>OutputChannel</code> (asynchronous).
    */
   def forward(msg: Msg): Unit
+
+  /**
+   * Returns the <code>Actor</code> that is
+   * receiving from this <code>OutputChannel</code>.
+   */
+  def receiver: Actor
 }
-- 
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