Version 0.8.10.2

dart/tools/dom/src/Isolates.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.
-
-part of html;
-
-_serialize(var message) {
-  return new _JsSerializer().traverse(message);
-}
-
-class _JsSerializer extends _Serializer {
-
-  visitSendPortSync(SendPortSync x) {
-    if (x is _JsSendPortSync) return visitJsSendPortSync(x);
-    if (x is _LocalSendPortSync) return visitLocalSendPortSync(x);
-    if (x is _RemoteSendPortSync) return visitRemoteSendPortSync(x);
-    throw "Unknown port type $x";
-  }
-
-  visitJsSendPortSync(_JsSendPortSync x) {
-    return [ 'sendport', 'nativejs', x._id ];
-  }
-
-  visitLocalSendPortSync(_LocalSendPortSync x) {
-    return [ 'sendport', 'dart',
-             ReceivePortSync._isolateId, x._receivePort._portId ];
-  }
-
-  visitSendPort(SendPort x) {
-    throw new UnimplementedError('Asynchronous send port not yet implemented.');
-  }
-
-  visitRemoteSendPortSync(_RemoteSendPortSync x) {
-    return [ 'sendport', 'dart', x._isolateId, x._portId ];
-  }
-}
-
-_deserialize(var message) {
-  return new _JsDeserializer().deserialize(message);
-}
-
-
-class _JsDeserializer extends _Deserializer {
-
-  static const _UNSPECIFIED = const Object();
-
-  deserializeSendPort(List x) {
-    String tag = x[1];
-    switch (tag) {
-      case 'nativejs':
-        num id = x[2];
-        return new _JsSendPortSync(id);
-      case 'dart':
-        num isolateId = x[2];
-        num portId = x[3];
-        return ReceivePortSync._lookup(isolateId, portId);
-      default:
-        throw 'Illegal SendPortSync type: $tag';
-    }
-  }
-}
-
-// The receiver is JS.
-class _JsSendPortSync implements SendPortSync {
-
-  final num _id;
-  _JsSendPortSync(this._id);
-
-  callSync(var message) {
-    var serialized = _serialize(message);
-    var result = _callPortSync(_id, serialized);
-    return _deserialize(result);
-  }
-
-  bool operator==(var other) {
-    return (other is _JsSendPortSync) && (_id == other._id);
-  }
-
-  int get hashCode => _id;
-}
-
-// TODO(vsm): Differentiate between Dart2Js and Dartium isolates.
-// The receiver is a different Dart isolate, compiled to JS.
-class _RemoteSendPortSync implements SendPortSync {
-
-  int _isolateId;
-  int _portId;
-  _RemoteSendPortSync(this._isolateId, this._portId);
-
-  callSync(var message) {
-    var serialized = _serialize(message);
-    var result = _call(_isolateId, _portId, serialized);
-    return _deserialize(result);
-  }
-
-  static _call(int isolateId, int portId, var message) {
-    var target = 'dart-port-$isolateId-$portId';
-    // TODO(vsm): Make this re-entrant.
-    // TODO(vsm): Set this up set once, on the first call.
-    var source = '$target-result';
-    var result = null;
-    window.on[source].first.then((Event e) {
-      result = JSON.decode(_getPortSyncEventData(e));
-    });
-    _dispatchEvent(target, [source, message]);
-    return result;
-  }
-
-  bool operator==(var other) {
-    return (other is _RemoteSendPortSync) && (_isolateId == other._isolateId)
-      && (_portId == other._portId);
-  }
-
-  int get hashCode => _isolateId >> 16 + _portId;
-}
-
-// The receiver is in the same Dart isolate, compiled to JS.
-class _LocalSendPortSync implements SendPortSync {
-
-  ReceivePortSync _receivePort;
-
-  _LocalSendPortSync._internal(this._receivePort);
-
-  callSync(var message) {
-    // TODO(vsm): Do a more efficient deep copy.
-    var copy = _deserialize(_serialize(message));
-    var result = _receivePort._callback(copy);
-    return _deserialize(_serialize(result));
-  }
-
-  bool operator==(var other) {
-    return (other is _LocalSendPortSync)
-      && (_receivePort == other._receivePort);
-  }
-
-  int get hashCode => _receivePort.hashCode;
-}
-
-// TODO(vsm): Move this to dart:isolate.  This will take some
-// refactoring as there are dependences here on the DOM.  Users
-// interact with this class (or interface if we change it) directly -
-// new ReceivePortSync.  I think most of the DOM logic could be
-// delayed until the corresponding SendPort is registered on the
-// window.
-
-// A Dart ReceivePortSync (tagged 'dart' when serialized) is
-// identifiable / resolvable by the combination of its isolateid and
-// portid.  When a corresponding SendPort is used within the same
-// isolate, the _portMap below can be used to obtain the
-// ReceivePortSync directly.  Across isolates (or from JS), an
-// EventListener can be used to communicate with the port indirectly.
-class ReceivePortSync {
-
-  static Map<int, ReceivePortSync> _portMap;
-  static int _portIdCount;
-  static int _cachedIsolateId;
-
-  num _portId;
-  Function _callback;
-  StreamSubscription _portSubscription;
-
-  ReceivePortSync() {
-    if (_portIdCount == null) {
-      _portIdCount = 0;
-      _portMap = new Map<int, ReceivePortSync>();
-    }
-    _portId = _portIdCount++;
-    _portMap[_portId] = this;
-  }
-
-  static int get _isolateId {
-    // TODO(vsm): Make this coherent with existing isolate code.
-    if (_cachedIsolateId == null) {
-      _cachedIsolateId = _getNewIsolateId();
-    }
-    return _cachedIsolateId;
-  }
-
-  static String _getListenerName(isolateId, portId) =>
-      'dart-port-$isolateId-$portId';
-  String get _listenerName => _getListenerName(_isolateId, _portId);
-
-  void receive(callback(var message)) {
-    _callback = callback;
-    if (_portSubscription == null) {
-      _portSubscription = window.on[_listenerName].listen((Event e) {
-        var data = JSON.decode(_getPortSyncEventData(e));
-        var replyTo = data[0];
-        var message = _deserialize(data[1]);
-        var result = _callback(message);
-        _dispatchEvent(replyTo, _serialize(result));
-      });
-    }
-  }
-
-  void close() {
-    _portMap.remove(_portId);
-    if (_portSubscription != null) _portSubscription.cancel();
-  }
-
-  SendPortSync toSendPort() {
-    return new _LocalSendPortSync._internal(this);
-  }
-
-  static SendPortSync _lookup(int isolateId, int portId) {
-    if (isolateId == _isolateId) {
-      return _portMap[portId].toSendPort();
-    } else {
-      return new _RemoteSendPortSync(isolateId, portId);
-    }
-  }
-}
-
-get _isolateId => ReceivePortSync._isolateId;
-
-void _dispatchEvent(String receiver, var message) {
-  var event = new CustomEvent(receiver, canBubble: false, cancelable:false,
-    detail: JSON.encode(message));
-  window.dispatchEvent(event);
-}
-
-String _getPortSyncEventData(CustomEvent event) => event.detail;