diff options
Diffstat (limited to 'chrome/browser/net/connect_interceptor.h')
-rw-r--r-- | chrome/browser/net/connect_interceptor.h | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/chrome/browser/net/connect_interceptor.h b/chrome/browser/net/connect_interceptor.h index b0b15f1..c1f6177 100644 --- a/chrome/browser/net/connect_interceptor.h +++ b/chrome/browser/net/connect_interceptor.h @@ -1,4 +1,4 @@ -// Copyright (c) 2010 The Chromium Authors. All rights reserved. +// Copyright (c) 2011 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. @@ -8,6 +8,9 @@ #include "net/url_request/url_request.h" +#include "base/gtest_prod_util.h" +#include "base/memory/mru_cache.h" + namespace chrome_browser_net { //------------------------------------------------------------------------------ @@ -29,6 +32,40 @@ class ConnectInterceptor : public net::URLRequest::Interceptor { const GURL& location); private: + // Provide access to local class TimedCache for testing. + FRIEND_TEST(ConnectInterceptorTest, TimedCacheRecall); + FRIEND_TEST(ConnectInterceptorTest, TimedCacheEviction); + + // 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); + + // 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); + }; + TimedCache timed_cache_; + DISALLOW_COPY_AND_ASSIGN(ConnectInterceptor); }; |