chrome/browser/prerender/prerender_link_manager.h

   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
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_LINK_MANAGER_H_
   6 #define CHROME_BROWSER_PRERENDER_PRERENDER_LINK_MANAGER_H_
   7
   8 #include <list>
   9
  10 #include "base/basictypes.h"
  11 #include "base/gtest_prod_util.h"
  12 #include "base/time/time.h"
  13 #include "chrome/browser/prerender/prerender_handle.h"
  14 #include "components/keyed_service/core/keyed_service.h"
  15 #include "url/gurl.h"
  16
  17 class Profile;
  18
  19 namespace content {
  20 struct Referrer;
  21 }
  22
  23 namespace gfx {
  24 class Size;
  25 }
  26
  27 FORWARD_DECLARE_TEST(WebViewTest, NoPrerenderer);
  28
  29 namespace prerender {
  30
  31 class PrerenderContents;
  32 class PrerenderManager;
  33
  34 // PrerenderLinkManager implements the API on Link elements for all documents
  35 // being rendered in this chrome instance.  It receives messages from the
  36 // renderer indicating addition, cancelation and abandonment of link elements,
  37 // and controls the PrerenderManager accordingly.
  38 class PrerenderLinkManager : public KeyedService,
  39                              public PrerenderHandle::Observer {
  40  public:
  41   explicit PrerenderLinkManager(PrerenderManager* manager);
  42   ~PrerenderLinkManager() override;
  43
  44   // A <link rel=prerender ...> element has been inserted into the document.
  45   // The |prerender_id| must be unique per |child_id|, and is assigned by the
  46   // WebPrerendererClient.
  47   void OnAddPrerender(int child_id,
  48                       int prerender_id,
  49                       const GURL& url,
  50                       uint32 rel_types,
  51                       const content::Referrer& referrer,
  52                       const gfx::Size& size,
  53                       int render_view_route_id);
  54
  55   // A <link rel=prerender ...> element has been explicitly removed from a
  56   // document.
  57   void OnCancelPrerender(int child_id, int prerender_id);
  58
  59   // A renderer launching <link rel=prerender ...> has navigated away from the
  60   // launching page, the launching renderer process has crashed, or perhaps the
  61   // renderer process was fast-closed when the last render view in it was
  62   // closed.
  63   void OnAbandonPrerender(int child_id, int prerender_id);
  64
  65   // If a renderer channel closes (crash, fast exit, etc...), that's effectively
  66   // an abandon of any prerenders launched by that child.
  67   void OnChannelClosing(int child_id);
  68
  69  private:
  70   friend class PrerenderBrowserTest;
  71   friend class PrerenderTest;
  72   // WebViewTest.NoPrerenderer needs to access the private IsEmpty() method.
  73   FRIEND_TEST_ALL_PREFIXES(::WebViewTest, NoPrerenderer);
  74
  75   struct LinkPrerender {
  76     LinkPrerender(int launcher_child_id,
  77                   int prerender_id,
  78                   const GURL& url,
  79                   uint32 rel_types,
  80                   const content::Referrer& referrer,
  81                   const gfx::Size& size,
  82                   int render_view_route_id,
  83                   base::TimeTicks creation_time,
  84                   PrerenderContents* deferred_launcher);
  85     ~LinkPrerender();
  86
  87     // Parameters from PrerenderLinkManager::OnAddPrerender():
  88     int launcher_child_id;
  89     int prerender_id;
  90     GURL url;
  91     uint32 rel_types;
  92     content::Referrer referrer;
  93     gfx::Size size;
  94     int render_view_route_id;
  95
  96     // The time at which this Prerender was added to PrerenderLinkManager.
  97     base::TimeTicks creation_time;
  98
  99     // If non-NULL, this link prerender was launched by an unswapped prerender,
 100     // |deferred_launcher|. When |deferred_launcher| is swapped in, the field is
 101     // set to NULL.
 102     PrerenderContents* deferred_launcher;
 103
 104     // Initially NULL, |handle| is set once we start this prerender. It is owned
 105     // by this struct, and must be deleted before destructing this struct.
 106     PrerenderHandle* handle;
 107
 108     // True if this prerender has become a MatchComplete replacement. This state
 109     // is maintained so the renderer is not notified of a stop twice.
 110     bool is_match_complete_replacement;
 111
 112     // True if this prerender has been abandoned by its launcher.
 113     bool has_been_abandoned;
 114   };
 115
 116   class PendingPrerenderManager;
 117
 118   bool IsEmpty() const;
 119
 120   // Returns a count of currently running prerenders.
 121   size_t CountRunningPrerenders() const;
 122
 123   // Start any prerenders that can be started, respecting concurrency limits for
 124   // the system and per launcher.
 125   void StartPrerenders();
 126
 127   LinkPrerender* FindByLauncherChildIdAndPrerenderId(int child_id,
 128                                                      int prerender_id);
 129
 130   LinkPrerender* FindByPrerenderHandle(PrerenderHandle* prerender_handle);
 131
 132   // Removes |prerender| from the the prerender link manager. Deletes the
 133   // PrerenderHandle as needed.
 134   void RemovePrerender(LinkPrerender* prerender);
 135
 136   // Cancels |prerender| and removes |prerender| from the prerender link
 137   // manager.
 138   void CancelPrerender(LinkPrerender* prerender);
 139
 140   // Called when |launcher| is swapped in.
 141   void StartPendingPrerendersForLauncher(PrerenderContents* launcher);
 142
 143   // Called when |launcher| is aborted.
 144   void CancelPendingPrerendersForLauncher(PrerenderContents* launcher);
 145
 146   // From KeyedService:
 147   void Shutdown() override;
 148
 149   // From PrerenderHandle::Observer:
 150   void OnPrerenderStart(PrerenderHandle* prerender_handle) override;
 151   void OnPrerenderStopLoading(PrerenderHandle* prerender_handle) override;
 152   void OnPrerenderDomContentLoaded(PrerenderHandle* prerender_handle) override;
 153   void OnPrerenderStop(PrerenderHandle* prerender_handle) override;
 154   void OnPrerenderCreatedMatchCompleteReplacement(
 155       PrerenderHandle* handle) override;
 156
 157   bool has_shutdown_;
 158
 159   PrerenderManager* manager_;
 160
 161   // All prerenders known to this PrerenderLinkManager. Insertions are always
 162   // made at the back, so the oldest prerender is at the front, and the youngest
 163   // at the back.
 164   std::list<LinkPrerender> prerenders_;
 165
 166   // Helper object to manage prerenders which are launched by other prerenders
 167   // and must be deferred until the launcher is swapped in.
 168   scoped_ptr<PendingPrerenderManager> pending_prerender_manager_;
 169
 170   DISALLOW_COPY_AND_ASSIGN(PrerenderLinkManager);
 171 };
 172
 173 }  // namespace prerender
 174
 175 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_LINK_MANAGER_H_