isolates refactor: this change introduces 'dart:isolate' as a library. This is a

frog/lib/isolate_serialization.dart

Index: frog/lib/isolate_serialization.dart
diff --git a/frog/lib/isolate_serialization.dart b/frog/lib/isolate_serialization.dart
deleted file mode 100644
index 17cc532be9ee4d89abc761e34ba79f4177a60aa3..0000000000000000000000000000000000000000
--- a/frog/lib/isolate_serialization.dart
+++ /dev/null
@@ -1,337 +0,0 @@
-// 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.
-
-/**
- * Abstract visitor for dart objects that can be passed as messages between any
- * isolates.
- */
-class MessageTraverser {
-  static bool isPrimitive(x) {
-    return (x === null) || (x is String) || (x is num) || (x is bool);
-  }
-
-  MessageTraverser();
-
-  /** Visitor's entry point. */
-  traverse(var x) {
-    if (isPrimitive(x)) return visitPrimitive(x);
-    _taggedObjects = new List();
-    var result;
-    try {
-      result = _dispatch(x);
-    } finally {
-      _cleanup();
-    }
-    return result;
-  }
-
-  /** Remove all information injected in the native objects by this visitor. */
-  void _cleanup() {
-    int len = _taggedObjects.length;
-    for (int i = 0; i < len; i++) {
-      _clearAttachedInfo(_taggedObjects[i]);
-    }
-    _taggedObjects = null;
-  }
-
-  /** Injects into the native object some information used by the visitor. */
-  void _attachInfo(var o, var info) {
-    _taggedObjects.add(o);
-    _setAttachedInfo(o, info);
-  }
-
-  /** Retrieves any information stored in the native object [o]. */
-  _getInfo(var o) {
-    return _getAttachedInfo(o);
-  }
-
-  _dispatch(var x) {
-    if (isPrimitive(x)) return visitPrimitive(x);
-    if (x is List) return visitList(x);
-    if (x is Map) return visitMap(x);
-    if (x is NativeJsSendPort) return visitNativeJsSendPort(x);
-    if (x is WorkerSendPort) return visitWorkerSendPort(x);
-    if (x is BufferingSendPort) return visitBufferingSendPort(x);
-    if (x is ReceivePortImpl) return visitReceivePort(x);
-    if (x is ReceivePortSingleShotImpl) return visitReceivePortSingleShot(x);
-    // TODO(floitsch): make this a real exception. (which one)?
-    throw "Message serialization: Illegal value $x passed";
-  }
-
-  abstract visitPrimitive(x);
-  abstract visitList(List x);
-  abstract visitMap(Map x);
-  abstract visitNativeJsSendPort(NativeJsSendPort x);
-  abstract visitWorkerSendPort(WorkerSendPort x);
-  abstract visitBufferingSendPort(BufferingSendPort x);
-  abstract visitReceivePort(ReceivePortImpl x);
-  abstract visitReceivePortSingleShot(ReceivePortSingleShotImpl x);
-
-  List _taggedObjects;
-
-  _clearAttachedInfo(var o) native
-      "o['__MessageTraverser__attached_info__'] = (void 0);";
-
-  _setAttachedInfo(var o, var info) native
-      "o['__MessageTraverser__attached_info__'] = info;";
-
-  _getAttachedInfo(var o) native
-      "return o['__MessageTraverser__attached_info__'];";
-
-  _visitNativeOrWorkerPort(SendPort p) {
-    if (p is NativeJsSendPort) return visitNativeJsSendPort(p);
-    if (p is WorkerSendPort) return visitWorkerSendPort(p);
-    throw "Illegal underlying port $p";
-  }
-}
-
-/** A visitor that recursively copies a message. */
-class Copier extends MessageTraverser {
-  Copier() : super();
-
-  visitPrimitive(x) => x;
-
-  List visitList(List list) {
-    List copy = _getInfo(list);
-    if (copy !== null) return copy;
-
-    int len = list.length;
-
-    // TODO(floitsch): we loose the generic type of the List.
-    copy = new List(len);
-    _attachInfo(list, copy);
-    for (int i = 0; i < len; i++) {
-      copy[i] = _dispatch(list[i]);
-    }
-    return copy;
-  }
-
-  Map visitMap(Map map) {
-    Map copy = _getInfo(map);
-    if (copy !== null) return copy;
-
-    // TODO(floitsch): we loose the generic type of the map.
-    copy = new Map();
-    _attachInfo(map, copy);
-    map.forEach((key, val) {
-      copy[_dispatch(key)] = _dispatch(val);
-    });
-    return copy;
-  }
-
-  SendPort visitNativeJsSendPort(NativeJsSendPort port) {
-    return new NativeJsSendPort(port._receivePort, port._isolateId);
-  }
-
-  SendPort visitWorkerSendPort(WorkerSendPort port) {
-    return new WorkerSendPort(
-        port._workerId, port._isolateId, port._receivePortId);
-  }
-
-  SendPort visitBufferingSendPort(BufferingSendPort port) {
-    if (port._port != null) {
-      return _visitNativeOrWorkerPort(port._port);
-    } else {
-      // TODO(floitsch): Use real exception (which one?).
-      throw "internal error: must call _waitForPendingPorts to ensure all"
-          + " ports are resolved at this point.";
-    }
-  }
-
-  SendPort visitReceivePort(ReceivePortImpl port) {
-    return port.toSendPort();
-  }
-
-  SendPort visitReceivePortSingleShot(ReceivePortSingleShotImpl port) {
-    return port.toSendPort();
-  }
-}
-
-/** Visitor that serializes a message as a JSON array. */
-class Serializer extends MessageTraverser {
-  Serializer() : super();
-
-  visitPrimitive(x) => x;
-
-  visitList(List list) {
-    int copyId = _getInfo(list);
-    if (copyId !== null) return ['ref', copyId];
-
-    int id = _nextFreeRefId++;
-    _attachInfo(list, id);
-    var jsArray = _serializeList(list);
-    // TODO(floitsch): we are losing the generic type.
-    return ['list', id, jsArray];
-  }
-
-  visitMap(Map map) {
-    int copyId = _getInfo(map);
-    if (copyId !== null) return ['ref', copyId];
-
-    int id = _nextFreeRefId++;
-    _attachInfo(map, id);
-    var keys = _serializeList(map.getKeys());
-    var values = _serializeList(map.getValues());
-    // TODO(floitsch): we are losing the generic type.
-    return ['map', id, keys, values];
-  }
-
-  visitNativeJsSendPort(NativeJsSendPort port) {
-    return ['sendport', _globalState.currentWorkerId,
-        port._isolateId, port._receivePort._id];
-  }
-
-  visitWorkerSendPort(WorkerSendPort port) {
-    return ['sendport', port._workerId, port._isolateId, port._receivePortId];
-  }
-
-  visitBufferingSendPort(BufferingSendPort port) {
-    if (port._port != null) {
-      return _visitNativeOrWorkerPort(port._port);
-    } else {
-      // TODO(floitsch): Use real exception (which one?).
-      throw "internal error: must call _waitForPendingPorts to ensure all"
-          + " ports are resolved at this point.";
-    }
-  }
-
-  visitReceivePort(ReceivePortImpl port) {
-    return visitNativeJsSendPort(port.toSendPort());;
-  }
-
-  visitReceivePortSingleShot(ReceivePortSingleShotImpl port) {
-    return visitNativeJsSendPort(port.toSendPort());
-  }
-
-  _serializeList(List list) {
-    int len = list.length;
-    var result = new List(len);
-    for (int i = 0; i < len; i++) {
-      result[i] = _dispatch(list[i]);
-    }
-    return result;
-  }
-
-  int _nextFreeRefId = 0;
-}
-
-/** Visitor that finds all unresolved [SendPort]s in a message. */
-class PendingSendPortFinder extends MessageTraverser {
-  List<Future<SendPort>> ports;
-  PendingSendPortFinder() : super(), ports = [];
-
-  visitPrimitive(x) {}
-  visitNativeJsSendPort(NativeJsSendPort port) {}
-  visitWorkerSendPort(WorkerSendPort port) {}
-  visitReceivePort(ReceivePortImpl port) {}
-  visitReceivePortSingleShot(ReceivePortSingleShotImpl port) {}
-
-  visitList(List list) {
-    final visited = _getInfo(list);
-    if (visited !== null) return;
-    _attachInfo(list, true);
-    // TODO(sigmund): replace with the following: (bug #1660)
-    // list.forEach(_dispatch);
-    list.forEach((e) => _dispatch(e));
-  }
-
-  visitMap(Map map) {
-    final visited = _getInfo(map);
-    if (visited !== null) return;
-
-    _attachInfo(map, true);
-    // TODO(sigmund): replace with the following: (bug #1660)
-    // map.getValues().forEach(_dispatch);
-    map.getValues().forEach((e) => _dispatch(e));
-  }
-
-  visitBufferingSendPort(BufferingSendPort port) {
-    if (port._port == null) {
-      ports.add(port._futurePort);
-    }
-  }
-}
-
-
-/** Deserializes arrays created with [Serializer]. */
-class Deserializer {
-  Deserializer();
-
-  static bool isPrimitive(x) {
-    return (x === null) || (x is String) || (x is num) || (x is bool);
-  }
-
-  deserialize(x) {
-    if (isPrimitive(x)) return x;
-    // TODO(floitsch): this should be new HashMap<int, var|Dynamic>()
-    _deserialized = new HashMap();
-    return _deserializeHelper(x);
-  }
-
-  _deserializeHelper(x) {
-    if (isPrimitive(x)) return x;
-    assert(x is List);
-    switch (x[0]) {
-      case 'ref': return _deserializeRef(x);
-      case 'list': return _deserializeList(x);
-      case 'map': return _deserializeMap(x);
-      case 'sendport': return _deserializeSendPort(x);
-      // TODO(floitsch): Use real exception (which one?).
-      default: throw "Unexpected serialized object";
-    }
-  }
-
-  _deserializeRef(List x) {
-    int id = x[1];
-    var result = _deserialized[id];
-    assert(result !== null);
-    return result;
-  }
-
-  List _deserializeList(List x) {
-    int id = x[1];
-    // We rely on the fact that Dart-lists are directly mapped to Js-arrays.
-    List dartList = x[2];
-    _deserialized[id] = dartList;
-    int len = dartList.length;
-    for (int i = 0; i < len; i++) {
-      dartList[i] = _deserializeHelper(dartList[i]);
-    }
-    return dartList;
-  }
-
-  Map _deserializeMap(List x) {
-    Map result = new Map();
-    int id = x[1];
-    _deserialized[id] = result;
-    List keys = x[2];
-    List values = x[3];
-    int len = keys.length;
-    assert(len == values.length);
-    for (int i = 0; i < len; i++) {
-      var key = _deserializeHelper(keys[i]);
-      var value = _deserializeHelper(values[i]);
-      result[key] = value;
-    }
-    return result;
-  }
-
-  SendPort _deserializeSendPort(List x) {
-    int workerId = x[1];
-    int isolateId = x[2];
-    int receivePortId = x[3];
-    // If two isolates are in the same worker, we use NativeJsSendPorts to
-    // deliver messages directly without using postMessage.
-    if (workerId == _globalState.currentWorkerId) {
-      var isolate = _globalState.isolates[isolateId];
-      if (isolate == null) return null; // Isolate has been closed.
-      var receivePort = isolate.lookup(receivePortId);
-      return new NativeJsSendPort(receivePort, isolateId);
-    } else {
-      return new WorkerSendPort(workerId, isolateId, receivePortId);
-    }
-  }
-
-  Map<int, Dynamic> _deserialized;
-}