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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 |
11 // before it is really needed, and hence reduce latency in the standard lookup | 11 // before it is really needed, and hence reduce latency in the standard lookup |
12 // paths. | 12 // paths. |
13 // Subresource relationships are usually acquired from the referrer field in a | 13 // Subresource relationships are usually acquired from the referrer field in a |
14 // navigation. A subresource URL may be associated with a referrer URL. Later | 14 // navigation. A subresource URL may be associated with a referrer URL. Later |
15 // navigations may, if the likelihood of needing the subresource is high enough, | 15 // navigations may, if the likelihood of needing the subresource is high enough, |
16 // cause this module to speculatively create a TCP/IP connection. If there is | 16 // cause this module to speculatively create a TCP/IP connection. If there is |
17 // only a low likelihood, then a DNS pre-resolution operation may be performed. | 17 // only a low likelihood, then a DNS pre-resolution operation may be performed. |
18 | 18 |
19 #ifndef CHROME_BROWSER_NET_PREDICTOR_H_ | 19 #ifndef CHROME_BROWSER_NET_PREDICTOR_H_ |
20 #define CHROME_BROWSER_NET_PREDICTOR_H_ | 20 #define CHROME_BROWSER_NET_PREDICTOR_H_ |
21 | 21 |
22 #include <map> | 22 #include <map> |
23 #include <queue> | 23 #include <queue> |
24 #include <set> | 24 #include <set> |
25 #include <string> | 25 #include <string> |
26 #include <vector> | 26 #include <vector> |
27 | 27 |
| 28 #include <stddef.h> |
| 29 |
| 30 #include <stdint.h> |
| 31 |
28 #include "base/gtest_prod_util.h" | 32 #include "base/gtest_prod_util.h" |
| 33 #include "base/macros.h" |
29 #include "base/memory/scoped_ptr.h" | 34 #include "base/memory/scoped_ptr.h" |
30 #include "base/memory/weak_ptr.h" | 35 #include "base/memory/weak_ptr.h" |
31 #include "chrome/browser/net/prediction_options.h" | 36 #include "chrome/browser/net/prediction_options.h" |
32 #include "chrome/browser/net/referrer.h" | 37 #include "chrome/browser/net/referrer.h" |
33 #include "chrome/browser/net/timed_cache.h" | 38 #include "chrome/browser/net/timed_cache.h" |
34 #include "chrome/browser/net/url_info.h" | 39 #include "chrome/browser/net/url_info.h" |
35 #include "components/network_hints/common/network_hints_common.h" | 40 #include "components/network_hints/common/network_hints_common.h" |
36 #include "net/base/host_port_pair.h" | 41 #include "net/base/host_port_pair.h" |
37 | 42 |
38 class IOThread; | 43 class IOThread; |
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400 static const double kDiscardableExpectedValue; | 405 static const double kDiscardableExpectedValue; |
401 // During trimming operation to discard hosts for which we don't have likely | 406 // During trimming operation to discard hosts for which we don't have likely |
402 // subresources, we multiply the expected_subresource_use_ value by the | 407 // subresources, we multiply the expected_subresource_use_ value by the |
403 // following ratio until that value is less than kDiscardableExpectedValue. | 408 // following ratio until that value is less than kDiscardableExpectedValue. |
404 // This number should always be less than 1, an more than 0. | 409 // This number should always be less than 1, an more than 0. |
405 static const double kReferrerTrimRatio; | 410 static const double kReferrerTrimRatio; |
406 | 411 |
407 // Interval between periodic trimming of our whole referrer list. | 412 // Interval between periodic trimming of our whole referrer list. |
408 // We only do a major trimming about once an hour, and then only when the user | 413 // We only do a major trimming about once an hour, and then only when the user |
409 // is actively browsing. | 414 // is actively browsing. |
410 static const int64 kDurationBetweenTrimmingsHours; | 415 static const int64_t kDurationBetweenTrimmingsHours; |
411 // Interval between incremental trimmings (to avoid inducing Jank). | 416 // Interval between incremental trimmings (to avoid inducing Jank). |
412 static const int64 kDurationBetweenTrimmingIncrementsSeconds; | 417 static const int64_t kDurationBetweenTrimmingIncrementsSeconds; |
413 // Number of referring URLs processed in an incremental trimming. | 418 // Number of referring URLs processed in an incremental trimming. |
414 static const size_t kUrlsTrimmedPerIncrement; | 419 static const size_t kUrlsTrimmedPerIncrement; |
415 | 420 |
416 // Only for testing. Returns true if hostname has been successfully resolved | 421 // Only for testing. Returns true if hostname has been successfully resolved |
417 // (name found). | 422 // (name found). |
418 bool WasFound(const GURL& url) const { | 423 bool WasFound(const GURL& url) const { |
419 Results::const_iterator it(results_.find(url)); | 424 Results::const_iterator it(results_.find(url)); |
420 return (it != results_.end()) && | 425 return (it != results_.end()) && |
421 it->second.was_found(); | 426 it->second.was_found(); |
422 } | 427 } |
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613 | 618 |
614 private: | 619 private: |
615 // These member functions return True for unittests. | 620 // These member functions return True for unittests. |
616 bool CanPrefetchAndPrerender() const override; | 621 bool CanPrefetchAndPrerender() const override; |
617 bool CanPreresolveAndPreconnect() const override; | 622 bool CanPreresolveAndPreconnect() const override; |
618 }; | 623 }; |
619 | 624 |
620 } // namespace chrome_browser_net | 625 } // namespace chrome_browser_net |
621 | 626 |
622 #endif // CHROME_BROWSER_NET_PREDICTOR_H_ | 627 #endif // CHROME_BROWSER_NET_PREDICTOR_H_ |
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