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| 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
| 4 | 4 |
| 5 library task; | 5 library task; |
| 6 | 6 |
| 7 import 'dart:async'; | 7 import 'dart:async'; |
| 8 import 'dart:collection'; | 8 import 'dart:collection'; |
| 9 | 9 |
| 10 import 'package:stack_trace/stack_trace.dart'; | 10 import 'package:stack_trace/stack_trace.dart'; |
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| 57 int _id; | 57 int _id; |
| 58 | 58 |
| 59 /// A Future that will complete to the return value of [fn] once this task | 59 /// A Future that will complete to the return value of [fn] once this task |
| 60 /// finishes running. | 60 /// finishes running. |
| 61 Future get result => _resultCompleter.future; | 61 Future get result => _resultCompleter.future; |
| 62 final _resultCompleter = new Completer(); | 62 final _resultCompleter = new Completer(); |
| 63 | 63 |
| 64 final Chain stackChain; | 64 final Chain stackChain; |
| 65 | 65 |
| 66 Task(fn(), String description, TaskQueue queue) | 66 Task(fn(), String description, TaskQueue queue) |
| 67 : this._(fn, description, queue, null, queue.contents.length); | 67 : this._(fn, description, queue, null, queue.contents.length); |
| 68 | 68 |
| 69 Task._child(fn(), String description, Task parent) | 69 Task._child(fn(), String description, Task parent) |
| 70 : this._(fn, description, parent.queue, parent, parent.children.length); | 70 : this._(fn, description, parent.queue, parent, parent.children.length); |
| 71 | 71 |
| 72 Task._(fn(), this.description, TaskQueue queue, this.parent, this._id) | 72 Task._(fn(), this.description, TaskQueue queue, this.parent, this._id) |
| 73 : queue = queue, | 73 : queue = queue, |
| 74 stackChain = new Chain.current() { | 74 stackChain = new Chain.current() { |
| 75 this.fn = () { | 75 this.fn = () { |
| 76 if (state != TaskState.WAITING) { | 76 if (state != TaskState.WAITING) { |
| 77 throw new StateError("Can't run $state task '$this'."); | 77 throw new StateError("Can't run $state task '$this'."); |
| 78 } | 78 } |
| 79 | 79 |
| 80 _state = TaskState.RUNNING; | 80 _state = TaskState.RUNNING; |
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| 149 final String name; | 149 final String name; |
| 150 | 150 |
| 151 /// Whether the state indicates that the task has finished running. This is | 151 /// Whether the state indicates that the task has finished running. This is |
| 152 /// true for both the [SUCCESS] and [ERROR] states. | 152 /// true for both the [SUCCESS] and [ERROR] states. |
| 153 bool get isDone => this == SUCCESS || this == ERROR; | 153 bool get isDone => this == SUCCESS || this == ERROR; |
| 154 | 154 |
| 155 const TaskState._(this.name); | 155 const TaskState._(this.name); |
| 156 | 156 |
| 157 String toString() => name; | 157 String toString() => name; |
| 158 } | 158 } |
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