Modifying prefetch to account for multi-profile.

chrome/browser/net/connect_interceptor.cc

 // 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.
 
 #include "chrome/browser/net/connect_interceptor.h"
 
 #include "chrome/browser/net/predictor_api.h"
 #include "net/base/load_flags.h"
+#include "net/url_request/url_request.h"
 
 namespace chrome_browser_net {
 
 // We don't bother learning to preconnect via a GET if the original URL
 // navigation was so long ago, that a preconnection would have been dropped
 // anyway.  We believe most servers will drop the connection in 10 seconds, so
 // we currently estimate this time-till-drop at 10 seconds.
 // TODO(jar): We should do a persistent field trial to validate/optimize this.
 static const int kMaxUnusedSocketLifetimeSecondsWithoutAGet = 10;
 
-ConnectInterceptor::ConnectInterceptor()
+ConnectInterceptor::ConnectInterceptor(Predictor* predictor)
     : timed_cache_(base::TimeDelta::FromSeconds(
-          kMaxUnusedSocketLifetimeSecondsWithoutAGet)) {
-  net::URLRequest::RegisterRequestInterceptor(this);
+          kMaxUnusedSocketLifetimeSecondsWithoutAGet)),
+      predictor_(predictor) {
 }
 
 ConnectInterceptor::~ConnectInterceptor() {
-  net::URLRequest::UnregisterRequestInterceptor(this);
 }
 
 net::URLRequestJob* ConnectInterceptor::MaybeIntercept(
-    net::URLRequest* request) {
+    net::URLRequest* request) const {
   GURL request_scheme_host(Predictor::CanonicalizeUrl(request->url()));
   if (request_scheme_host == GURL::EmptyGURL())
     return NULL;
 
   // Learn what URLs are likely to be needed during next startup.
-  LearnAboutInitialNavigation(request_scheme_host);
+  predictor_->LearnAboutInitialNavigation(request_scheme_host);
 
   bool redirected_host = false;
   if (request->referrer().empty()) {
     if (request->url() != request->original_url()) {
       // This request was completed with a redirect.
       GURL original_scheme_host(request->original_url().GetWithEmptyPath());
       if (request_scheme_host != original_scheme_host) {
         redirected_host = true;
         // Don't learn from redirects that take path as an argument, but do
         // learn from short-hand typing entries, such as "cnn.com" redirects to
         // "www.cnn.com".  We can't just check for has_path(), as a mere "/"
         // will count as a path, so we check that the path is at most a "/"
         // (1 character long) to decide the redirect is "definitive" and has no
         // significant path.
         // TODO(jar): It may be ok to learn from all redirects, as the adaptive
         // system will not respond until several identical redirects have taken
         // place.  Hence a use of a path (that changes) wouldn't really be
         // learned from anyway.
         if (request->original_url().path().length() <= 1 &&
             timed_cache_.WasRecentlySeen(original_scheme_host)) {
           // TODO(jar): These definite redirects could be learned much faster.
-          LearnFromNavigation(original_scheme_host, request_scheme_host);
+          predictor_->LearnFromNavigation(original_scheme_host,
+                                          request_scheme_host);
         }
       }
     }
   } else {
     GURL referring_scheme_host = GURL(request->referrer()).GetWithEmptyPath();
     bool is_subresource = !(request->load_flags() & net::LOAD_MAIN_FRAME);
     // Learn about our referring URL, for use in the future.
     if (is_subresource && timed_cache_.WasRecentlySeen(referring_scheme_host))
-      LearnFromNavigation(referring_scheme_host, request_scheme_host);
+      predictor_->LearnFromNavigation(referring_scheme_host,
+                                      request_scheme_host);
     if (referring_scheme_host == request_scheme_host) {
       // We've already made any/all predictions when we navigated to the
       // referring host, so we can bail out here.
       // We don't update the RecentlySeen() time because any preconnections
       // need to be made at the first navigation (i.e., when referer was loaded)
       // and wouldn't have waited for this current request navigation.
       return NULL;
     }
   }
   timed_cache_.SetRecentlySeen(request_scheme_host);
 
   // Subresources for main frames usually get predicted when we detected the
   // main frame request - way back in RenderViewHost::Navigate.  So only handle
   // predictions now for subresources or for redirected hosts.
   if ((request->load_flags() & net::LOAD_SUB_FRAME) || redirected_host)
-    PredictFrameSubresources(request_scheme_host);
+    predictor_->PredictFrameSubresources(request_scheme_host);
   return NULL;
 }
 
 net::URLRequestJob* ConnectInterceptor::MaybeInterceptResponse(
-    net::URLRequest* request) {
+    net::URLRequest* request) const {
   return NULL;
 }
 
 net::URLRequestJob* ConnectInterceptor::MaybeInterceptRedirect(
-    net::URLRequest* request,
-    const GURL& location) {
+    const GURL& location,
+    net::URLRequest* request) const {
   return NULL;
 }
 
 ConnectInterceptor::TimedCache::TimedCache(const base::TimeDelta& max_duration)
     : mru_cache_(UrlMruTimedCache::NO_AUTO_EVICT),
       max_duration_(max_duration) {
 }
 
 // Make Clang compilation happy with explicit destructor.
 ConnectInterceptor::TimedCache::~TimedCache() {}
 
-bool ConnectInterceptor::TimedCache::WasRecentlySeen(const GURL& url) {
+bool ConnectInterceptor::TimedCache::WasRecentlySeen(const GURL& url) const {
   DCHECK_EQ(url.GetWithEmptyPath(), url);
   // Evict any overly old entries.
   base::TimeTicks now = base::TimeTicks::Now();
   UrlMruTimedCache::reverse_iterator eldest = mru_cache_.rbegin();
   while (!mru_cache_.empty()) {
     DCHECK(eldest == mru_cache_.rbegin());
     if (now - eldest->second < max_duration_)
       break;
     eldest = mru_cache_.Erase(eldest);
   }
   return mru_cache_.end() != mru_cache_.Peek(url);
 }
 
-void ConnectInterceptor::TimedCache::SetRecentlySeen(const GURL& url) {
+void ConnectInterceptor::TimedCache::SetRecentlySeen(const GURL& url) const {
   DCHECK_EQ(url.GetWithEmptyPath(), url);
   mru_cache_.Put(url, base::TimeTicks::Now());
 }
 
 }  // namespace chrome_browser_net