| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CHROME_BROWSER_NET_TIMED_CACHE_H_ |
| #define CHROME_BROWSER_NET_TIMED_CACHE_H_ |
| |
| #include "base/basictypes.h" |
| #include "base/containers/mru_cache.h" |
| #include "base/time/time.h" |
| |
| class GURL; |
| |
| namespace chrome_browser_net { |
| |
| // Define a LRU cache that recalls all navigations within the last N seconds. |
| // When we learn about subresources to possibly preconnect to, it would be a |
| // waste to preconnect when the original navigation was too long ago. Any |
| // connected, but unused TCP/IP connection, will generally be reset by the |
| // server if it is not used quickly (i.e., GET or POST is sent). |
| class TimedCache { |
| public: |
| explicit TimedCache(const base::TimeDelta& max_duration); |
| ~TimedCache(); |
| |
| // Evicts any entries that have been in the FIFO "too long," and then checks |
| // to see if the given url is (still) in the FIFO cache. |
| bool WasRecentlySeen(const GURL& url); |
| |
| // Adds the given url to the cache, where it will remain for max_duration_. |
| void SetRecentlySeen(const GURL& url); |
| |
| private: |
| // Our cache will be keyed on a URL (actually, just a scheme/host/port). |
| // We will always track the time it was last added to the FIFO cache by |
| // remembering a TimeTicks value. |
| typedef base::MRUCache<GURL, base::TimeTicks> UrlMruTimedCache; |
| UrlMruTimedCache mru_cache_; |
| |
| // The longest time an entry can persist in the cache, and still be found. |
| const base::TimeDelta max_duration_; |
| |
| DISALLOW_COPY_AND_ASSIGN(TimedCache); |
| }; |
| |
| } // namespace chrome_browser_net |
| |
| #endif // CHROME_BROWSER_NET_TIMED_CACHE_H_ |