OLD | NEW |
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 barback.utils.file_pool; | 5 library barback.utils.file_pool; |
6 | 6 |
7 import 'dart:async'; | 7 import 'dart:async'; |
8 import 'dart:convert'; | 8 import 'dart:convert'; |
9 import 'dart:io'; | 9 import 'dart:io'; |
10 | 10 |
(...skipping 16 matching lines...) Expand all Loading... |
27 /// substantial additional throughput. | 27 /// substantial additional throughput. |
28 final Pool _pool = new Pool(32, timeout: new Duration(seconds: 60)); | 28 final Pool _pool = new Pool(32, timeout: new Duration(seconds: 60)); |
29 | 29 |
30 /// Opens the file at [path] for reading. | 30 /// Opens the file at [path] for reading. |
31 /// | 31 /// |
32 /// When the returned stream is listened to, if there are too many files | 32 /// When the returned stream is listened to, if there are too many files |
33 /// open, this will wait for a previously opened file to be closed and then | 33 /// open, this will wait for a previously opened file to be closed and then |
34 /// try again. | 34 /// try again. |
35 Stream<List<int>> openRead(String path) { | 35 Stream<List<int>> openRead(String path) { |
36 return futureStream(_pool.request().then((resource) { | 36 return futureStream(_pool.request().then((resource) { |
37 return new File(path).openRead().transform( | 37 return new File(path) |
38 new StreamTransformer.fromHandlers(handleDone: (sink) { | 38 .openRead() |
| 39 .transform(new StreamTransformer.fromHandlers(handleDone: (sink) { |
39 sink.close(); | 40 sink.close(); |
40 resource.release(); | 41 resource.release(); |
41 })); | 42 })); |
42 })); | 43 })); |
43 } | 44 } |
44 | 45 |
45 /// Reads [path] as a string using [encoding]. | 46 /// Reads [path] as a string using [encoding]. |
46 /// | 47 /// |
47 /// If there are too many files open and the read fails, this will wait for | 48 /// If there are too many files open and the read fails, this will wait for |
48 /// a previously opened file to be closed and then try again. | 49 /// a previously opened file to be closed and then try again. |
49 Future<String> readAsString(String path, Encoding encoding) { | 50 Future<String> readAsString(String path, Encoding encoding) { |
50 return _readAsBytes(path).then(encoding.decode); | 51 return _readAsBytes(path).then(encoding.decode); |
51 } | 52 } |
52 | 53 |
53 /// Reads [path] as a list of bytes, using [openRead] to retry if there are | 54 /// Reads [path] as a list of bytes, using [openRead] to retry if there are |
54 /// failures. | 55 /// failures. |
55 Future<List<int>> _readAsBytes(String path) { | 56 Future<List<int>> _readAsBytes(String path) { |
56 var completer = new Completer<List<int>>(); | 57 var completer = new Completer<List<int>>(); |
57 var builder = new BytesBuilder(); | 58 var builder = new BytesBuilder(); |
58 | 59 |
59 openRead(path).listen(builder.add, onDone: () { | 60 openRead(path).listen(builder.add, onDone: () { |
60 completer.complete(builder.takeBytes()); | 61 completer.complete(builder.takeBytes()); |
61 }, onError: completer.completeError, cancelOnError: true); | 62 }, onError: completer.completeError, cancelOnError: true); |
62 | 63 |
63 return completer.future; | 64 return completer.future; |
64 } | 65 } |
65 } | 66 } |
OLD | NEW |