SendPort + ReceivePort changes:

runtime/lib/isolate.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class _ReceivePortFactory {
   factory ReceivePort() {
     return new _ReceivePortImpl();
   }
-
-  factory ReceivePort.singleShot() {
-    return new _ReceivePortSingleShotImpl();
-  }
 }
 
 
 class _ReceivePortImpl implements ReceivePort {
   /*--- public interface ---*/
   factory _ReceivePortImpl() native "ReceivePortImpl_factory";
 
   receive(void onMessage(var message, SendPort replyTo)) {
     _onMessage = onMessage;
   }
@@ skipping 37 matching lines @@
   static _closeInternal(int id) native "ReceivePortImpl_closeInternal";
 
   final int _id;
   var _onMessage;
 
   // id to ReceivePort mapping.
   static Map _portMap;
 }
 
 
-class _ReceivePortSingleShotImpl implements ReceivePort {
-
-  _ReceivePortSingleShotImpl() : _port = new _ReceivePortImpl() { }
-
-  void receive(void callback(var message, SendPort replyTo)) {
-    _port.receive((var message, SendPort replyTo) {
-      _port.close();
-      callback(message, replyTo);
-    });
-  }
-
-  void close() {
-    _port.close();
-  }
-
-  SendPort toSendPort() {
-    return _port.toSendPort();
-  }
-
-  final _ReceivePortImpl _port;
-
-}
-
-
 class _SendPortImpl implements SendPort {
   /*--- public interface ---*/
   void send(var message, [SendPort replyTo = null]) {
     this._sendNow(message, replyTo);
   }
 
   void _sendNow(var message, SendPort replyTo) {
     int replyId = (replyTo === null) ? 0 : replyTo._id;
     _sendInternal(_id, replyId, message);
   }
 
-  _ReceivePortSingleShotImpl call(var message) {
-    final result = new _ReceivePortSingleShotImpl();
-    this.send(message, result.toSendPort());
-    return result;
-  }
-
-  _ReceivePortSingleShotImpl _callNow(var message) {
-    final result = new _ReceivePortSingleShotImpl();
-    this._sendNow(message, result.toSendPort());
-    return result;
+  Future call(var message) {
+    final completer = new Completer();
+    final port = new _ReceivePortImpl();
+    send(message, port.toSendPort());
+    port.receive((value, ignoreReplyTo) {
+      port.close();
+      if (value is Exception) {
+        completer.completeException(value);
+      } else {
+        completer.complete(value);
+      }
+    });
+    return completer.future;
   }
 
   bool operator==(var other) {
     return (other is _SendPortImpl) && _id == other._id;
   }
 
   int hashCode() {
     return _id;
   }
 
@@ skipping 34 matching lines @@
 
 SendPort _spawnFunction(void topLevelFunction()) {
   throw new NotImplementedException();
 }
 
 SendPort _spawnUri(String uri) {
   throw new NotImplementedException();
 }
 
 ReceivePort _port = null;