content/browser/site_instance_impl.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 CONTENT_BROWSER_SITE_INSTANCE_IMPL_H_
   6 #define CONTENT_BROWSER_SITE_INSTANCE_IMPL_H_
   7
   8 #include "content/browser/renderer_host/render_process_host_impl.h"
   9 #include "content/common/content_export.h"
  10 #include "content/public/browser/render_process_host_observer.h"
  11 #include "content/public/browser/site_instance.h"
  12 #include "url/gurl.h"
  13
  14 namespace content {
  15 class BrowsingInstance;
  16 class RenderProcessHostFactory;
  17
  18 class CONTENT_EXPORT SiteInstanceImpl : public SiteInstance,
  19                                         public RenderProcessHostObserver {
  20  public:
  21   // SiteInstance interface overrides.
  22   int32 GetId() override;
  23   bool HasProcess() const override;
  24   RenderProcessHost* GetProcess() override;
  25   BrowserContext* GetBrowserContext() const override;
  26   const GURL& GetSiteURL() const override;
  27   SiteInstance* GetRelatedSiteInstance(const GURL& url) override;
  28   bool IsRelatedSiteInstance(const SiteInstance* instance) override;
  29   size_t GetRelatedActiveContentsCount() override;
  30
  31   // Set the web site that this SiteInstance is rendering pages for.
  32   // This includes the scheme and registered domain, but not the port.  If the
  33   // URL does not have a valid registered domain, then the full hostname is
  34   // stored.
  35   void SetSite(const GURL& url);
  36   bool HasSite() const;
  37
  38   // Returns whether there is currently a related SiteInstance (registered with
  39   // BrowsingInstance) for the site of the given url.  If so, we should try to
  40   // avoid dedicating an unused SiteInstance to it (e.g., in a new tab).
  41   bool HasRelatedSiteInstance(const GURL& url);
  42
  43   // Returns whether this SiteInstance has a process that is the wrong type for
  44   // the given URL.  If so, the browser should force a process swap when
  45   // navigating to the URL.
  46   bool HasWrongProcessForURL(const GURL& url);
  47
  48   // Increase the number of active frames in this SiteInstance. This is
  49   // increased when a frame is created, or a currently swapped out frame
  50   // is swapped in.
  51   void increment_active_frame_count() { active_frame_count_++; }
  52
  53   // Decrease the number of active frames in this SiteInstance. This is
  54   // decreased when a frame is destroyed, or a currently active frame is
  55   // swapped out.
  56   void decrement_active_frame_count() { active_frame_count_--; }
  57
  58   // Get the number of active frames which belong to this SiteInstance.  If
  59   // there are no active frames left, all frames in this SiteInstance can be
  60   // safely discarded.
  61   size_t active_frame_count() { return active_frame_count_; }
  62
  63   // Increase the number of active WebContentses using this SiteInstance. Note
  64   // that, unlike active_frame_count, this does not count pending RFHs.
  65   void IncrementRelatedActiveContentsCount();
  66
  67   // Decrease the number of active WebContentses using this SiteInstance. Note
  68   // that, unlike active_frame_count, this does not count pending RFHs.
  69   void DecrementRelatedActiveContentsCount();
  70
  71   // Sets the global factory used to create new RenderProcessHosts.  It may be
  72   // NULL, in which case the default BrowserRenderProcessHost will be created
  73   // (this is the behavior if you don't call this function).  The factory must
  74   // be set back to NULL before it's destroyed; ownership is not transferred.
  75   static void set_render_process_host_factory(
  76       const RenderProcessHostFactory* rph_factory);
  77
  78   // Get the effective URL for the given actual URL.  This allows the
  79   // ContentBrowserClient to override the SiteInstance's site for certain URLs.
  80   // For example, Chrome uses this to replace hosted app URLs with extension
  81   // hosts.
  82   // Only public so that we can make a consistent process swap decision in
  83   // RenderFrameHostManager.
  84   static GURL GetEffectiveURL(BrowserContext* browser_context,
  85                               const GURL& url);
  86
  87  protected:
  88   friend class BrowsingInstance;
  89   friend class SiteInstance;
  90
  91   // Virtual to allow tests to extend it.
  92   ~SiteInstanceImpl() override;
  93
  94   // Create a new SiteInstance.  Protected to give access to BrowsingInstance
  95   // and tests; most callers should use Create or GetRelatedSiteInstance
  96   // instead.
  97   explicit SiteInstanceImpl(BrowsingInstance* browsing_instance);
  98
  99  private:
 100   // RenderProcessHostObserver implementation.
 101   void RenderProcessHostDestroyed(RenderProcessHost* host) override;
 102
 103   // Used to restrict a process' origin access rights.
 104   void LockToOrigin();
 105
 106   // An object used to construct RenderProcessHosts.
 107   static const RenderProcessHostFactory* g_render_process_host_factory_;
 108
 109   // The next available SiteInstance ID.
 110   static int32 next_site_instance_id_;
 111
 112   // A unique ID for this SiteInstance.
 113   int32 id_;
 114
 115   // The number of active frames in this SiteInstance.
 116   size_t active_frame_count_;
 117
 118   // BrowsingInstance to which this SiteInstance belongs.
 119   scoped_refptr<BrowsingInstance> browsing_instance_;
 120
 121   // Current RenderProcessHost that is rendering pages for this SiteInstance.
 122   // This pointer will only change once the RenderProcessHost is destructed.  It
 123   // will still remain the same even if the process crashes, since in that
 124   // scenario the RenderProcessHost remains the same.
 125   RenderProcessHost* process_;
 126
 127   // The web site that this SiteInstance is rendering pages for.
 128   GURL site_;
 129
 130   // Whether SetSite has been called.
 131   bool has_site_;
 132
 133   DISALLOW_COPY_AND_ASSIGN(SiteInstanceImpl);
 134 };
 135
 136 }  // namespace content
 137
 138 #endif  // CONTENT_BROWSER_SITE_INSTANCE_IMPL_H_