Revert "Unify dart:isolate."

lib/isolate/base.dart

-// 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.
-
-class IsolateSpawnException implements Exception {
-  const IsolateSpawnException(String this._s);
-  String toString() => "IsolateSpawnException: '$_s'";
-  final String _s;
-}
-
-/**
- * The initial [ReceivePort] available by default for this isolate. This
- * [ReceivePort] is created automatically and it is commonly used to establish
- * the first communication between isolates (see [spawnFunction] and
- * [spawnUri]).
- */
-external ReceivePort get port();
-
-/**
- * Creates and spawns an isolate that shares the same code as the current
- * isolate, but that starts from [topLevelFunction]. The [topLevelFunction]
- * argument must be a static top-level function or a static method that takes no
- * arguments. It is illegal to pass a function closure.
- *
- * When any isolate starts (even the main script of the application), a default
- * [ReceivePort] is created for it. This port is available from the top-level
- * getter [port] defined in this library.
- *
- * [spawnFunction] returns a [SendPort] derived from the child isolate's default
- * port.
- *
- * See comments at the top of this library for more details.
- */
-// Note this feature is not yet available in the dartvm.
-external SendPort spawnFunction(void topLevelFunction());
-
-/**
- * Creates and spawns an isolate whose code is available at [uri].  Like with
- * [spawnFunction], the child isolate will have a default [ReceivePort], and a
- * this function returns a [SendPort] derived from it.
- *
- * See comments at the top of this library for more details.
- */
-external SendPort spawnUri(String uri);
-
-/**
- * [SendPort]s are created from [ReceivePort]s. Any message sent through
- * a [SendPort] is delivered to its respective [ReceivePort]. There might be
- * many [SendPort]s for the same [ReceivePort].
- *
- * [SendPort]s can be transmitted to other isolates.
- */
-interface SendPort extends Hashable {
-
-  /**
-   * Sends an asynchronous [message] to this send port. The message is copied to
-   * the receiving isolate. If specified, the [replyTo] port will be provided to
-   * the receiver to facilitate exchanging sequences of messages.
-   *
-   * The content of [message] can be: primitive values (null, num, bool, double,
-   * String), instances of [SendPort], and lists and maps whose elements are any
-   * of these. List and maps are also allowed to be cyclic.
-   *
-   * In the special circumstances when two isolates share the same code and are
-   * running in the same process (e.g. isolates created via [spawnFunction]), it
-   * is also possible to send object instances (which would be copied in the
-   * process). This is currently only supported by the dartvm.  For now, the
-   * frog compiler only supports the restricted messages described above.
-   *
-   * Deprecation note: it is no longer valid to transmit a [ReceivePort] in a
-   * message. Previously they were translated to the corresponding send port
-   * before being transmitted.
-   */
-  void send(var message, [SendPort replyTo]);
-
-  /**
-   * Sends a message to this send port and returns a [Future] of the reply.
-   * Basically, this internally creates a new receive port, sends a
-   * message to this send port with replyTo set to such receive port, and, when
-   * a reply is received, it closes the receive port and completes the returned
-   * future.
-   */
-  Future call(var message);
-
-  /**
-   * Tests whether [other] is a [SendPort] pointing to the same
-   * [ReceivePort] as this one.
-   */
-  bool operator==(var other);
-
-  /**
-   * Returns an immutable hash code for this send port that is
-   * consistent with the == operator.
-   */
-  int hashCode();
-
-}
-
-/**
- * [ReceivePort]s, together with [SendPort]s, are the only means of
- * communication between isolates. [ReceivePort]s have a [:toSendPort:] method
- * which returns a [SendPort]. Any message that is sent through this [SendPort]
- * is delivered to the [ReceivePort] it has been created from. There, they are
- * dispatched to the callback that has been registered on the receive port.
- *
- * A [ReceivePort] may have many [SendPort]s.
- */
-interface ReceivePort default _ReceivePortFactory {
-
-  /**
-   * Opens a long-lived port for receiving messages. The returned port
-   * must be explicitly closed through [ReceivePort.close].
-   */
-  ReceivePort();
-
-  /**
-   * Sets up a callback function for receiving pending or future
-   * messages on this receive port.
-   */
-  void receive(void callback(var message, SendPort replyTo));
-
-  /**
-   * Closes this receive port immediately. Pending messages will not
-   * be processed and it is impossible to re-open the port. Single-shot
-   * reply ports, such as those created through [SendPort.call], are
-   * automatically closed when the reply has been received. Multiple
-   * invocations of [close] are allowed but ignored.
-   */
-  void close();
-
-  /**
-   * Creates a new send port that sends to this receive port. It is legal to
-   * create several [SendPort]s from the same [ReceivePort].
-   */
-  SendPort toSendPort();
-
-}
-
-// TODO(kasperl): Make this hashable and document it.
-interface SendPortSync {
-
-  callSync(var message);
-
-}
-
-class _ReceivePortFactory {
-  external factory ReceivePort();
-}