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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, 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 event_helper; | 5 library event_helper; |
6 | 6 |
7 import 'dart:async'; | 7 import 'dart:async'; |
8 | 8 |
9 abstract class Event { | 9 abstract class Event { |
10 void replay(EventSink sink); | 10 void replay(EventSink sink); |
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63 final List<Event> events = []; | 63 final List<Event> events = []; |
64 | 64 |
65 Events(); | 65 Events(); |
66 Events.fromIterable(Iterable iterable) { | 66 Events.fromIterable(Iterable iterable) { |
67 for (var value in iterable) add(value); | 67 for (var value in iterable) add(value); |
68 close(); | 68 close(); |
69 } | 69 } |
70 | 70 |
71 /** Capture events from a stream into a new [Events] object. */ | 71 /** Capture events from a stream into a new [Events] object. */ |
72 factory Events.capture(Stream stream, | 72 factory Events.capture(Stream stream, |
73 { bool unsubscribeOnError: false }) = CaptureEvents; | 73 { bool cancelOnError: false }) = CaptureEvents; |
74 | 74 |
75 // EventSink interface. | 75 // EventSink interface. |
76 void add(var value) { | 76 void add(var value) { |
77 events.add(new DataEvent(value)); | 77 events.add(new DataEvent(value)); |
78 } | 78 } |
79 | 79 |
80 void addError(AsyncError error) { | 80 void addError(AsyncError error) { |
81 events.add(new ErrorEvent(error)); | 81 events.add(new ErrorEvent(error)); |
82 } | 82 } |
83 | 83 |
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127 * Sets an action to be called when this [Events] receives a 'done' event. | 127 * Sets an action to be called when this [Events] receives a 'done' event. |
128 */ | 128 */ |
129 void onDone(void action()) { | 129 void onDone(void action()) { |
130 throw new StateError("Not capturing events."); | 130 throw new StateError("Not capturing events."); |
131 } | 131 } |
132 } | 132 } |
133 | 133 |
134 class CaptureEvents extends Events { | 134 class CaptureEvents extends Events { |
135 StreamSubscription subscription; | 135 StreamSubscription subscription; |
136 Completer onDoneSignal; | 136 Completer onDoneSignal; |
137 bool unsubscribeOnError = false; | 137 bool cancelOnError = false; |
138 | 138 |
139 CaptureEvents(Stream stream, | 139 CaptureEvents(Stream stream, |
140 { bool unsubscribeOnError: false }) | 140 { bool cancelOnError: false }) |
141 : onDoneSignal = new Completer() { | 141 : onDoneSignal = new Completer() { |
142 this.unsubscribeOnError = unsubscribeOnError; | 142 this.cancelOnError = cancelOnError; |
143 subscription = stream.listen(add, | 143 subscription = stream.listen(add, |
144 onError: addError, | 144 onError: addError, |
145 onDone: close, | 145 onDone: close, |
146 unsubscribeOnError: unsubscribeOnError); | 146 cancelOnError: cancelOnError); |
147 } | 147 } |
148 | 148 |
149 void addError(AsyncError error) { | 149 void addError(AsyncError error) { |
150 super.addError(error); | 150 super.addError(error); |
151 if (unsubscribeOnError) onDoneSignal.complete(null); | 151 if (cancelOnError) onDoneSignal.complete(null); |
152 } | 152 } |
153 | 153 |
154 void close() { | 154 void close() { |
155 super.close(); | 155 super.close(); |
156 if (onDoneSignal != null) onDoneSignal.complete(null); | 156 if (onDoneSignal != null) onDoneSignal.complete(null); |
157 } | 157 } |
158 | 158 |
159 void pause([Future resumeSignal]) { | 159 void pause([Future resumeSignal]) { |
160 subscription.pause(resumeSignal); | 160 subscription.pause(resumeSignal); |
161 } | 161 } |
162 | 162 |
163 void resume() { | 163 void resume() { |
164 subscription.resume(); | 164 subscription.resume(); |
165 } | 165 } |
166 | 166 |
167 void onDone(void action()) { | 167 void onDone(void action()) { |
168 onDoneSignal.future.whenComplete(action); | 168 onDoneSignal.future.whenComplete(action); |
169 } | 169 } |
170 } | 170 } |
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