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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 // VMOptions=--old_gen_heap_size=64 | 5 // VMOptions=--old_gen_heap_size=64 |
6 | 6 |
7 library slow_consumer2_test; | 7 library slow_consumer2_test; |
8 | 8 |
9 import 'package:async_helper/async_helper.dart'; | 9 import 'package:async_helper/async_helper.dart'; |
10 import "package:expect/expect.dart"; | 10 import "package:expect/expect.dart"; |
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24 | 24 |
25 SlowConsumer(int this.bytesPerSecond, int this.bufferSize); | 25 SlowConsumer(int this.bytesPerSecond, int this.bufferSize); |
26 | 26 |
27 Future consume(Stream stream) { | 27 Future consume(Stream stream) { |
28 return addStream(stream).then((_) => close()); | 28 return addStream(stream).then((_) => close()); |
29 } | 29 } |
30 | 30 |
31 Future addStream(Stream stream) { | 31 Future addStream(Stream stream) { |
32 Completer result = new Completer(); | 32 Completer result = new Completer(); |
33 var subscription; | 33 var subscription; |
34 subscription = stream.listen( | 34 subscription = stream.listen((List<int> data) { |
35 (List<int> data) { | 35 receivedCount += data.length; |
36 receivedCount += data.length; | 36 usedBufferSize += data.length; |
37 usedBufferSize += data.length; | 37 bufferedData.add(data); |
38 bufferedData.add(data); | 38 int currentBufferedDataLength = bufferedData.length; |
39 int currentBufferedDataLength = bufferedData.length; | 39 if (usedBufferSize > bufferSize) { |
40 if (usedBufferSize > bufferSize) { | 40 subscription.pause(); |
41 subscription.pause(); | 41 usedBufferSize = 0; |
42 usedBufferSize = 0; | 42 int ms = data.length * 1000 ~/ bytesPerSecond; |
43 int ms = data.length * 1000 ~/ bytesPerSecond; | 43 Duration duration = new Duration(milliseconds: ms); |
44 Duration duration = new Duration(milliseconds: ms); | 44 new Timer(duration, () { |
45 new Timer(duration, () { | 45 for (int i = 0; i < currentBufferedDataLength; i++) { |
46 for (int i = 0; i < currentBufferedDataLength; i++) { | 46 bufferedData[i] = null; |
47 bufferedData[i] = null; | 47 } |
48 } | 48 subscription.resume(); |
49 subscription.resume(); | 49 }); |
50 }); | 50 } |
51 } | 51 }, onDone: () { |
52 }, | 52 finalCount = receivedCount; |
53 onDone: () { | 53 result.complete(receivedCount); |
54 finalCount = receivedCount; | 54 }); |
55 result.complete(receivedCount); | |
56 }); | |
57 return result.future; | 55 return result.future; |
58 } | 56 } |
59 | 57 |
60 Future close() { | 58 Future close() { |
61 return new Future.value(finalCount); | 59 return new Future.value(finalCount); |
62 } | 60 } |
63 } | 61 } |
64 | 62 |
65 class DataProvider { | 63 class DataProvider { |
66 final int chunkSize; | 64 final int chunkSize; |
67 final int bytesPerSecond; | 65 final int bytesPerSecond; |
68 int sentCount = 0; | 66 int sentCount = 0; |
69 int targetCount; | 67 int targetCount; |
70 StreamController controller; | 68 StreamController controller; |
71 | 69 |
72 DataProvider(int this.bytesPerSecond, int this.targetCount, this.chunkSize) { | 70 DataProvider(int this.bytesPerSecond, int this.targetCount, this.chunkSize) { |
73 controller = new StreamController( | 71 controller = new StreamController( |
74 sync: true, | 72 sync: true, onPause: onPauseStateChange, onResume: onPauseStateChange); |
75 onPause: onPauseStateChange, | |
76 onResume: onPauseStateChange); | |
77 Timer.run(send); | 73 Timer.run(send); |
78 } | 74 } |
79 | 75 |
80 Stream get stream => controller.stream; | 76 Stream get stream => controller.stream; |
81 | 77 |
82 send() { | 78 send() { |
83 if (controller.isPaused) return; | 79 if (controller.isPaused) return; |
84 if (sentCount == targetCount) { | 80 if (sentCount == targetCount) { |
85 controller.close(); | 81 controller.close(); |
86 return; | 82 return; |
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108 asyncStart(); | 104 asyncStart(); |
109 // The data provider can deliver 800MB/s of data. It sends 100MB of data to | 105 // The data provider can deliver 800MB/s of data. It sends 100MB of data to |
110 // the slower consumer who can only read 200MB/s. The data is sent in 1MB | 106 // the slower consumer who can only read 200MB/s. The data is sent in 1MB |
111 // chunks. The consumer has a buffer of 5MB. That is, it can accept a few | 107 // chunks. The consumer has a buffer of 5MB. That is, it can accept a few |
112 // packages without pausing its input. | 108 // packages without pausing its input. |
113 // | 109 // |
114 // This test is limited to 32MB of heap-space (see VMOptions on top of the | 110 // This test is limited to 32MB of heap-space (see VMOptions on top of the |
115 // file). If the consumer doesn't pause the data-provider it will run out of | 111 // file). If the consumer doesn't pause the data-provider it will run out of |
116 // heap-space. | 112 // heap-space. |
117 | 113 |
118 new DataProvider(800 * MB, 100 * MB, 1 * MB).stream | 114 new DataProvider(800 * MB, 100 * MB, 1 * MB) |
119 .pipe(new SlowConsumer(200 * MB, 5 * MB)) | 115 .stream |
120 .then((count) { | 116 .pipe(new SlowConsumer(200 * MB, 5 * MB)) |
121 Expect.equals(100 * MB, count); | 117 .then((count) { |
122 asyncEnd(); | 118 Expect.equals(100 * MB, count); |
123 }); | 119 asyncEnd(); |
| 120 }); |
124 } | 121 } |
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