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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 // Support modularity by calling to load a new SDCH filter dictionary. | 5 // Support modularity by calling to load a new SDCH filter dictionary. |
| 6 // Note that this sort of calling can't be done in the /net directory, as it has | 6 // Note that this sort of calling can't be done in the /net directory, as it has |
| 7 // no concept of the HTTP cache (which is only visible at the browser level). | 7 // no concept of the HTTP cache (which is only visible at the browser level). |
| 8 | 8 |
| 9 #ifndef CHROME_BROWSER_NET_SDCH_DICTIONARY_FETCHER_H_ | 9 #ifndef CHROME_BROWSER_NET_SDCH_DICTIONARY_FETCHER_H_ |
| 10 #define CHROME_BROWSER_NET_SDCH_DICTIONARY_FETCHER_H_ | 10 #define CHROME_BROWSER_NET_SDCH_DICTIONARY_FETCHER_H_ |
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| 25 SdchDictionaryFetcher(); | 25 SdchDictionaryFetcher(); |
| 26 virtual ~SdchDictionaryFetcher(); | 26 virtual ~SdchDictionaryFetcher(); |
| 27 | 27 |
| 28 // Stop fetching dictionaries, and abandon any current URLFetcheer operations | 28 // Stop fetching dictionaries, and abandon any current URLFetcheer operations |
| 29 // so that the IO thread can be stopped. | 29 // so that the IO thread can be stopped. |
| 30 static void Shutdown(); | 30 static void Shutdown(); |
| 31 | 31 |
| 32 // Implementation of SdchFetcher class. | 32 // Implementation of SdchFetcher class. |
| 33 // This method gets the requested dictionary, and then calls back into the | 33 // This method gets the requested dictionary, and then calls back into the |
| 34 // SdchManager class with the dictionary's text. | 34 // SdchManager class with the dictionary's text. |
| 35 virtual void Schedule(const GURL& dictionary_url); | 35 virtual void Schedule(const GURL& dictionary_url) OVERRIDE; |
| 36 | 36 |
| 37 private: | 37 private: |
| 38 // Delay in ms between Schedule and actual download. | 38 // Delay in ms between Schedule and actual download. |
| 39 // This leaves the URL in a queue, which is de-duped, so that there is less | 39 // This leaves the URL in a queue, which is de-duped, so that there is less |
| 40 // chance we'll try to load the same URL multiple times when a pile of | 40 // chance we'll try to load the same URL multiple times when a pile of |
| 41 // page subresources (or tabs opened in parallel) all suggest the dictionary. | 41 // page subresources (or tabs opened in parallel) all suggest the dictionary. |
| 42 static const int kMsDelayFromRequestTillDownload = 100; | 42 static const int kMsDelayFromRequestTillDownload = 100; |
| 43 | 43 |
| 44 // Ensure the download after the above delay. | 44 // Ensure the download after the above delay. |
| 45 void ScheduleDelayedRun(); | 45 void ScheduleDelayedRun(); |
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| 76 // bandwidth trying repeatedly). | 76 // bandwidth trying repeatedly). |
| 77 // The following set lists all the dictionary URLs that we've tried to load, | 77 // The following set lists all the dictionary URLs that we've tried to load, |
| 78 // so that we won't try to load from an URL more than once. | 78 // so that we won't try to load from an URL more than once. |
| 79 // TODO(jar): Try to augment the SDCH proposal to include this restiction. | 79 // TODO(jar): Try to augment the SDCH proposal to include this restiction. |
| 80 std::set<GURL> attempted_load_; | 80 std::set<GURL> attempted_load_; |
| 81 | 81 |
| 82 DISALLOW_COPY_AND_ASSIGN(SdchDictionaryFetcher); | 82 DISALLOW_COPY_AND_ASSIGN(SdchDictionaryFetcher); |
| 83 }; | 83 }; |
| 84 | 84 |
| 85 #endif // CHROME_BROWSER_NET_SDCH_DICTIONARY_FETCHER_H_ | 85 #endif // CHROME_BROWSER_NET_SDCH_DICTIONARY_FETCHER_H_ |
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