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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=32 | 5 // VMOptions=--old_gen_heap_size=32 |
6 | 6 |
7 library slow_consumer_test; | 7 library slow_consumer_test; |
8 | 8 |
9 import 'dart:async'; | 9 import 'dart:async'; |
10 import 'dart:isolate'; | 10 import 'dart:isolate'; |
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43 | 43 |
44 class DataProvider { | 44 class DataProvider { |
45 final int chunkSize; | 45 final int chunkSize; |
46 final int bytesPerSecond; | 46 final int bytesPerSecond; |
47 int sentCount = 0; | 47 int sentCount = 0; |
48 int targetCount; | 48 int targetCount; |
49 StreamController controller; | 49 StreamController controller; |
50 | 50 |
51 DataProvider(int this.bytesPerSecond, int this.targetCount, this.chunkSize) { | 51 DataProvider(int this.bytesPerSecond, int this.targetCount, this.chunkSize) { |
52 controller = new StreamController(onPauseStateChange: onPauseStateChange); | 52 controller = new StreamController(onPauseStateChange: onPauseStateChange); |
53 new Timer(0, (_) => send()); | 53 Timer.run(send); |
54 } | 54 } |
55 | 55 |
56 Stream get stream => controller.stream; | 56 Stream get stream => controller.stream; |
57 | 57 |
58 send() { | 58 send() { |
59 if (controller.isPaused) return; | 59 if (controller.isPaused) return; |
60 if (sentCount == targetCount) { | 60 if (sentCount == targetCount) { |
61 controller.close(); | 61 controller.close(); |
62 return; | 62 return; |
63 } | 63 } |
64 int listSize = chunkSize; | 64 int listSize = chunkSize; |
65 sentCount += listSize; | 65 sentCount += listSize; |
66 if (sentCount > targetCount) { | 66 if (sentCount > targetCount) { |
67 listSize -= sentCount - targetCount; | 67 listSize -= sentCount - targetCount; |
68 sentCount = targetCount; | 68 sentCount = targetCount; |
69 } | 69 } |
70 controller.add(new List.fixedLength(listSize)); | 70 controller.add(new List.fixedLength(listSize)); |
71 int ms = listSize * 1000 ~/ bytesPerSecond; | 71 int ms = listSize * 1000 ~/ bytesPerSecond; |
72 if (!controller.isPaused) new Timer(ms, (_) => send()); | 72 Duration duration = new Duration(milliseconds: ms); |
| 73 if (!controller.isPaused) new Timer(duration, send); |
73 } | 74 } |
74 | 75 |
75 onPauseStateChange() { | 76 onPauseStateChange() { |
76 // We don't care if we just unpaused or paused. In either case we just | 77 // We don't care if we just unpaused or paused. In either case we just |
77 // call send which will test it for us. | 78 // call send which will test it for us. |
78 send(); | 79 send(); |
79 } | 80 } |
80 } | 81 } |
81 | 82 |
82 main() { | 83 main() { |
83 var port = new ReceivePort(); | 84 var port = new ReceivePort(); |
84 // The data provider can deliver 800MB/s of data. It sends 100MB of data to | 85 // The data provider can deliver 800MB/s of data. It sends 100MB of data to |
85 // the slower consumer who can only read 200MB/s. The data is sent in 1MB | 86 // the slower consumer who can only read 200MB/s. The data is sent in 1MB |
86 // chunks. | 87 // chunks. |
87 // | 88 // |
88 // This test is limited to 32MB of heap-space (see VMOptions on top of the | 89 // This test is limited to 32MB of heap-space (see VMOptions on top of the |
89 // file). If the consumer doesn't pause the data-provider it will run out of | 90 // file). If the consumer doesn't pause the data-provider it will run out of |
90 // heap-space. | 91 // heap-space. |
91 | 92 |
92 new DataProvider(800 * MB, 100 * MB, 1 * MB).stream | 93 new DataProvider(800 * MB, 100 * MB, 1 * MB).stream |
93 .pipe(new SlowConsumer(200 * MB)) | 94 .pipe(new SlowConsumer(200 * MB)) |
94 .then((count) { | 95 .then((count) { |
95 port.close(); | 96 port.close(); |
96 Expect.equals(100 * MB, count); | 97 Expect.equals(100 * MB, count); |
97 }); | 98 }); |
98 } | 99 } |
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