isolates in frog: playing with API improvements

frog/lib/newisolate.dart

Index: frog/lib/newisolate.dart
diff --git a/frog/lib/newisolate.dart b/frog/lib/newisolate.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ad51d85a1156ae65d5a2a16e3892ce37819bfbca
--- /dev/null
+++ b/frog/lib/newisolate.dart
@@ -0,0 +1,46 @@
+// Copyright (c) 2012, 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.
+
+// TODO(sigmund): separate isolates from dart:core
+// #library('dart:isolate');
+
+/**
+ * [Isolate2] provides APIs to spawn, communicate, and stop an isolate. An
+ * isolate can be spawned by simply creating a new instance of [Isolate2]. The
+ * [Isolate2] instance exposes a port to communicate with the isolate and
+ * methods to control its behavior remotely.
+ */
+ // TODO(sigmund): rename to Isolate once we delete the old implementation
+interface Isolate2 default IsolateFactory {
+
+  /**
+   * Create and spawn an isolate that shares the same code as the current
+   * isolate, but that starts from [topLevelFunction]. The [topLevelFunction]
+   * argument must be a static method closure that takes exactly one
+   * argument of type [ReceivePort]. It is illegal to pass a function closure
+   * that captures values in scope.
+   *
+   * When an child isolate is spawned, a new [ReceivePort] is created for it.
+   * This port is passed to [topLevelFunction]. A [SendPort] derived from
+   * such port is sent to the spawner isolate, which is accessible in
+   * [Isolate2.sendPort] field of this instance.
+   */
+  Isolate2.fromCode(Function topLevelFunction);
+
+  /**
+   * Create and spawn an isolate whose code is available at [uri].
+   * The code in [uri] must have an method called [: isolateMain :], which takes
+   * exactly one argument of type [ReceivePort].
+   * Like with [Isolate2.fromCode], a [ReceivePort] is created in the child
+   * isolate, and a [SendPort] to it is stored in [Isolate2.sendPort].
+   */
+  Isolate2.fromUri(String uri);
+
+  /** Port used to communicate with this isolate. */
+  SendPort sendPort;
+
+  /** Stop this isolate. */
+  void stop();
+}
+