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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // A RendererNetPredictor instance is maintained for each RenderThread. | 5 // A RendererNetPredictor instance is maintained for each RenderThread. |
6 // URL strings are typically added to the embedded queue during rendering. | 6 // URL strings are typically added to the embedded queue during rendering. |
7 // The first addition to the queue (transitioning from empty to having | 7 // The first addition to the queue (transitioning from empty to having |
8 // some names) causes a processing task to be added to the Renderer Thread. | 8 // some names) causes a processing task to be added to the Renderer Thread. |
9 // The processing task gathers all buffered names, and send them via IPC | 9 // The processing task gathers all buffered names, and send them via IPC |
10 // to the browser, so that DNS lookups can be performed before the user attempts | 10 // to the browser, so that DNS lookups can be performed before the user attempts |
11 // to traverse a link. | 11 // to traverse a link. |
12 // This class removed some duplicates, and discards numeric IP addresss | 12 // This class removed some duplicates, and discards numeric IP addresss |
13 // (which wouldn't looked up in DNS anyway). | 13 // (which wouldn't looked up in DNS anyway). |
14 // To limit the time during the processing task (and avoid stalling the Render | 14 // To limit the time during the processing task (and avoid stalling the Render |
15 // thread), several limits are placed on how much of the queue to process. | 15 // thread), several limits are placed on how much of the queue to process. |
16 // If the processing task is not able to completely empty the queue, it | 16 // If the processing task is not able to completely empty the queue, it |
17 // schedules a future continuation of the task, and keeps the map of already | 17 // schedules a future continuation of the task, and keeps the map of already |
18 // sent names. If the entire queue is processed, then the list of "sent names" | 18 // sent names. If the entire queue is processed, then the list of "sent names" |
19 // is cleared so that future gatherings might again pass along the same names. | 19 // is cleared so that future gatherings might again pass along the same names. |
20 | 20 |
21 #ifndef CHROME_RENDERER_NET_RENDERER_NET_PREDICTOR_H_ | 21 #ifndef CHROME_RENDERER_NET_RENDERER_NET_PREDICTOR_H_ |
22 #define CHROME_RENDERER_NET_RENDERER_NET_PREDICTOR_H_ | 22 #define CHROME_RENDERER_NET_RENDERER_NET_PREDICTOR_H_ |
23 #pragma once | 23 #pragma once |
24 | 24 |
25 #include <map> | 25 #include <map> |
26 #include <string> | 26 #include <string> |
27 | 27 |
28 #include "base/basictypes.h" | 28 #include "base/basictypes.h" |
29 #include "base/memory/weak_ptr.h" | 29 #include "base/memory/weak_ptr.h" |
30 #include "base/task.h" | |
31 #include "chrome/renderer/net/predictor_queue.h" | 30 #include "chrome/renderer/net/predictor_queue.h" |
32 | 31 |
33 class RendererNetPredictor { | 32 class RendererNetPredictor { |
34 public: | 33 public: |
35 RendererNetPredictor(); | 34 RendererNetPredictor(); |
36 ~RendererNetPredictor(); | 35 ~RendererNetPredictor(); |
37 | 36 |
38 // Push a name into the queue to be resolved. | 37 // Push a name into the queue to be resolved. |
39 void Resolve(const char* name, size_t length); | 38 void Resolve(const char* name, size_t length); |
40 | 39 |
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96 // these metrics to modify buffer counts etc. some day. | 95 // these metrics to modify buffer counts etc. some day. |
97 int buffer_full_discard_count_; | 96 int buffer_full_discard_count_; |
98 int numeric_ip_discard_count_; | 97 int numeric_ip_discard_count_; |
99 | 98 |
100 base::WeakPtrFactory<RendererNetPredictor> weak_factory_; | 99 base::WeakPtrFactory<RendererNetPredictor> weak_factory_; |
101 | 100 |
102 DISALLOW_COPY_AND_ASSIGN(RendererNetPredictor); | 101 DISALLOW_COPY_AND_ASSIGN(RendererNetPredictor); |
103 }; // class RendererNetPredictor | 102 }; // class RendererNetPredictor |
104 | 103 |
105 #endif // CHROME_RENDERER_NET_RENDERER_NET_PREDICTOR_H_ | 104 #endif // CHROME_RENDERER_NET_RENDERER_NET_PREDICTOR_H_ |
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