| // Copyright (c) 2014, 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. |
| |
| library pub.asset.serialize.exception; |
| |
| import 'package:barback/barback.dart'; |
| import 'package:stack_trace/stack_trace.dart'; |
| |
| import '../utils.dart'; |
| |
| /// An exception that was originally raised in another isolate. |
| /// |
| /// Exception objects can't cross isolate boundaries in general, so this class |
| /// wraps as much information as can be consistently serialized. |
| class CrossIsolateException implements Exception { |
| /// The name of the type of exception thrown. |
| /// |
| /// This is the return value of [error.runtimeType.toString()]. Keep in mind |
| /// that objects in different libraries may have the same type name. |
| final String type; |
| |
| /// The exception's message, or its [toString] if it didn't expose a `message` |
| /// property. |
| final String message; |
| |
| /// The exception's stack chain, or `null` if no stack chain was available. |
| final Chain stackTrace; |
| |
| /// Loads a [CrossIsolateException] from a serialized representation. |
| /// |
| /// [error] should be the result of [CrossIsolateException.serialize]. |
| CrossIsolateException.deserialize(Map error) |
| : type = error['type'], |
| message = error['message'], |
| stackTrace = error['stack'] == null ? null : |
| new Chain.parse(error['stack']); |
| |
| /// Serializes [error] to an object that can safely be passed across isolate |
| /// boundaries. |
| static Map serialize(error, [StackTrace stack]) { |
| if (stack == null && error is Error) stack = error.stackTrace; |
| return { |
| 'type': error.runtimeType.toString(), |
| 'message': getErrorMessage(error), |
| 'stack': stack == null ? null : new Chain.forTrace(stack).toString() |
| }; |
| } |
| |
| String toString() => "$message\n$stackTrace"; |
| } |
| |
| /// An [AssetNotFoundException] that was originally raised in another isolate. |
| class _CrossIsolateAssetNotFoundException extends CrossIsolateException |
| implements AssetNotFoundException { |
| final AssetId id; |
| |
| String get message => "Could not find asset $id."; |
| |
| /// Loads a [_CrossIsolateAssetNotFoundException] from a serialized |
| /// representation. |
| /// |
| /// [error] should be the result of |
| /// [_CrossIsolateAssetNotFoundException.serialize]. |
| _CrossIsolateAssetNotFoundException.deserialize(Map error) |
| : id = new AssetId(error['package'], error['path']), |
| super.deserialize(error); |
| |
| /// Serializes [error] to an object that can safely be passed across isolate |
| /// boundaries. |
| static Map serialize(AssetNotFoundException error, [StackTrace stack]) { |
| var map = CrossIsolateException.serialize(error); |
| map['package'] = error.id.package; |
| map['path'] = error.id.path; |
| return map; |
| } |
| } |
| |
| /// Serializes [error] to an object that can safely be passed across isolate |
| /// boundaries. |
| /// |
| /// This handles [AssetNotFoundException]s specially, ensuring that their |
| /// metadata is preserved. |
| Map serializeException(error, [StackTrace stack]) { |
| if (error is AssetNotFoundException) { |
| return _CrossIsolateAssetNotFoundException.serialize(error, stack); |
| } else { |
| return CrossIsolateException.serialize(error, stack); |
| } |
| } |
| |
| /// Loads an exception from a serialized representation. |
| /// |
| /// This handles [AssetNotFoundException]s specially, ensuring that their |
| /// metadata is preserved. |
| CrossIsolateException deserializeException(Map error) { |
| if (error['type'] == 'AssetNotFoundException') { |
| return new _CrossIsolateAssetNotFoundException.deserialize(error); |
| } else { |
| return new CrossIsolateException.deserialize(error); |
| } |
| } |