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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 RendererDnsPrefetch instance is maintained for each RenderThread. | 5 // A RendererDnsPrefetch 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 COMPONENTS_NETWORK_HINTS_RENDERER_RENDERER_DNS_PREFETCH_H_ | 21 #ifndef COMPONENTS_NETWORK_HINTS_RENDERER_RENDERER_DNS_PREFETCH_H_ |
22 #define COMPONENTS_NETWORK_HINTS_RENDERER_RENDERER_DNS_PREFETCH_H_ | 22 #define COMPONENTS_NETWORK_HINTS_RENDERER_RENDERER_DNS_PREFETCH_H_ |
23 | 23 |
| 24 #include <stddef.h> |
| 25 |
24 #include <map> | 26 #include <map> |
25 #include <string> | 27 #include <string> |
26 | 28 |
27 #include "base/basictypes.h" | 29 #include "base/macros.h" |
28 #include "base/memory/weak_ptr.h" | 30 #include "base/memory/weak_ptr.h" |
29 #include "components/network_hints/renderer/dns_prefetch_queue.h" | 31 #include "components/network_hints/renderer/dns_prefetch_queue.h" |
30 | 32 |
31 namespace network_hints { | 33 namespace network_hints { |
32 | 34 |
33 // An internal interface to the network_hints component for efficiently sending | 35 // An internal interface to the network_hints component for efficiently sending |
34 // DNS prefetch requests to the net stack. | 36 // DNS prefetch requests to the net stack. |
35 class RendererDnsPrefetch { | 37 class RendererDnsPrefetch { |
36 public: | 38 public: |
37 RendererDnsPrefetch(); | 39 RendererDnsPrefetch(); |
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100 int numeric_ip_discard_count_; | 102 int numeric_ip_discard_count_; |
101 | 103 |
102 base::WeakPtrFactory<RendererDnsPrefetch> weak_factory_; | 104 base::WeakPtrFactory<RendererDnsPrefetch> weak_factory_; |
103 | 105 |
104 DISALLOW_COPY_AND_ASSIGN(RendererDnsPrefetch); | 106 DISALLOW_COPY_AND_ASSIGN(RendererDnsPrefetch); |
105 }; // class RendererDnsPrefetch | 107 }; // class RendererDnsPrefetch |
106 | 108 |
107 } // namespace network_hints | 109 } // namespace network_hints |
108 | 110 |
109 #endif // COMPONENTS_NETWORK_HINTS_RENDERER_RENDERER_DNS_PREFETCH_H_ | 111 #endif // COMPONENTS_NETWORK_HINTS_RENDERER_RENDERER_DNS_PREFETCH_H_ |
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