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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 Predictor object is instantiated once in the browser process, and manages | 5 // A Predictor object is instantiated once in the browser process, and manages |
| 6 // both preresolution of hostnames, as well as TCP/IP preconnection to expected | 6 // both preresolution of hostnames, as well as TCP/IP preconnection to expected |
| 7 // subresources. | 7 // subresources. |
| 8 // Most hostname lists are provided by the renderer processes, and include URLs | 8 // Most hostname lists are provided by the renderer processes, and include URLs |
| 9 // that *might* be used in the near future by the browsing user. One goal of | 9 // that *might* be used in the near future by the browsing user. One goal of |
| 10 // this class is to cause the underlying DNS structure to lookup a hostname | 10 // this class is to cause the underlying DNS structure to lookup a hostname |
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| 108 // avoidance will kick in and all speculations in the queue will be discarded. | 108 // avoidance will kick in and all speculations in the queue will be discarded. |
| 109 static const int kMaxSpeculativeResolveQueueDelayMs; | 109 static const int kMaxSpeculativeResolveQueueDelayMs; |
| 110 | 110 |
| 111 // We don't bother learning to preconnect via a GET if the original URL | 111 // We don't bother learning to preconnect via a GET if the original URL |
| 112 // navigation was so long ago, that a preconnection would have been dropped | 112 // navigation was so long ago, that a preconnection would have been dropped |
| 113 // anyway. We believe most servers will drop the connection in 10 seconds, so | 113 // anyway. We believe most servers will drop the connection in 10 seconds, so |
| 114 // we currently estimate this time-till-drop at 10 seconds. | 114 // we currently estimate this time-till-drop at 10 seconds. |
| 115 // TODO(jar): We should do a persistent field trial to validate/optimize this. | 115 // TODO(jar): We should do a persistent field trial to validate/optimize this. |
| 116 static const int kMaxUnusedSocketLifetimeSecondsWithoutAGet; | 116 static const int kMaxUnusedSocketLifetimeSecondsWithoutAGet; |
| 117 | 117 |
| 118 // The default value of the credentials flag when preconnecting. |
| 119 static const bool kAllowCredentialsOnPreconnect; |
| 120 |
| 118 // |max_concurrent| specifies how many concurrent (parallel) prefetches will | 121 // |max_concurrent| specifies how many concurrent (parallel) prefetches will |
| 119 // be performed. Host lookups will be issued through |host_resolver|. | 122 // be performed. Host lookups will be issued through |host_resolver|. |
| 120 explicit Predictor(bool preconnect_enabled, bool predictor_enabled); | 123 explicit Predictor(bool preconnect_enabled, bool predictor_enabled); |
| 121 | 124 |
| 122 virtual ~Predictor(); | 125 virtual ~Predictor(); |
| 123 | 126 |
| 124 // This function is used to create a predictor. For testing, we can create | 127 // This function is used to create a predictor. For testing, we can create |
| 125 // a version which does a simpler shutdown. | 128 // a version which does a simpler shutdown. |
| 126 static Predictor* CreatePredictor(bool preconnect_enabled, | 129 static Predictor* CreatePredictor(bool preconnect_enabled, |
| 127 bool predictor_enabled, | 130 bool predictor_enabled, |
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| 236 void SaveStateForNextStartupAndTrim(); | 239 void SaveStateForNextStartupAndTrim(); |
| 237 | 240 |
| 238 void SaveDnsPrefetchStateForNextStartupAndTrim( | 241 void SaveDnsPrefetchStateForNextStartupAndTrim( |
| 239 base::ListValue* startup_list, | 242 base::ListValue* startup_list, |
| 240 base::ListValue* referral_list, | 243 base::ListValue* referral_list, |
| 241 base::WaitableEvent* completion); | 244 base::WaitableEvent* completion); |
| 242 | 245 |
| 243 // May be called from either the IO or UI thread and will PostTask | 246 // May be called from either the IO or UI thread and will PostTask |
| 244 // to the IO thread if necessary. | 247 // to the IO thread if necessary. |
| 245 void PreconnectUrl(const GURL& url, const GURL& first_party_for_cookies, | 248 void PreconnectUrl(const GURL& url, const GURL& first_party_for_cookies, |
| 246 UrlInfo::ResolutionMotivation motivation, int count); | 249 UrlInfo::ResolutionMotivation motivation, int count, |
| 250 bool allow_credentials); |
| 247 | 251 |
| 248 void PreconnectUrlOnIOThread(const GURL& url, | 252 void PreconnectUrlOnIOThread(const GURL& url, |
| 249 const GURL& first_party_for_cookies, | 253 const GURL& first_party_for_cookies, |
| 250 UrlInfo::ResolutionMotivation motivation, | 254 UrlInfo::ResolutionMotivation motivation, |
| 251 int count); | 255 int count, |
| 256 bool allow_credentials); |
| 252 | 257 |
| 253 // ------------- End IO thread methods. | 258 // ------------- End IO thread methods. |
| 254 | 259 |
| 255 // The following methods may be called on either the IO or UI threads. | 260 // The following methods may be called on either the IO or UI threads. |
| 256 | 261 |
| 257 // Instigate pre-connection to any URLs, or pre-resolution of related host, | 262 // Instigate pre-connection to any URLs, or pre-resolution of related host, |
| 258 // that we predict will be needed after this navigation (typically | 263 // that we predict will be needed after this navigation (typically |
| 259 // more-embedded resources on a page). This method will actually post a task | 264 // more-embedded resources on a page). This method will actually post a task |
| 260 // to do the actual work, so as not to jump ahead of the frame navigation that | 265 // to do the actual work, so as not to jump ahead of the frame navigation that |
| 261 // instigated this activity. | 266 // instigated this activity. |
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| 609 | 614 |
| 610 private: | 615 private: |
| 611 // These member functions return True for unittests. | 616 // These member functions return True for unittests. |
| 612 bool CanPrefetchAndPrerender() const override; | 617 bool CanPrefetchAndPrerender() const override; |
| 613 bool CanPreresolveAndPreconnect() const override; | 618 bool CanPreresolveAndPreconnect() const override; |
| 614 }; | 619 }; |
| 615 | 620 |
| 616 } // namespace chrome_browser_net | 621 } // namespace chrome_browser_net |
| 617 | 622 |
| 618 #endif // CHROME_BROWSER_NET_PREDICTOR_H_ | 623 #endif // CHROME_BROWSER_NET_PREDICTOR_H_ |
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