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   virtual int32 GetId() OVERRIDE;
  23   virtual bool HasProcess() const OVERRIDE;
  24   virtual RenderProcessHost* GetProcess() OVERRIDE;
  25   virtual BrowserContext* GetBrowserContext() const OVERRIDE;
  26   virtual const GURL& GetSiteURL() const OVERRIDE;
  27   virtual SiteInstance* GetRelatedSiteInstance(const GURL& url) OVERRIDE;
  28   virtual bool IsRelatedSiteInstance(const SiteInstance* instance) OVERRIDE;
  29   virtual 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 views in this SiteInstance. This is
  49   // increased when a view is created, or a currently swapped out view
  50   // is swapped in.
  51   void increment_active_view_count() { active_view_count_++; }
  52
  53   // Decrease the number of active views in this SiteInstance. This is
  54   // decreased when a view is destroyed, or a currently active view is
  55   // swapped out.
  56   void decrement_active_view_count() { active_view_count_--; }
  57
  58   // Get the number of active views which belong to this
  59   // SiteInstance. If there is no active view left in this
  60   // SiteInstance, all view in this SiteInstance can be safely
  61   // discarded to save memory.
  62   size_t active_view_count() { return active_view_count_; }
  63
  64   // Increase the number of active WebContentses using this SiteInstance. Note
  65   // that, unlike active_view_count, this does not count pending RVHs.
  66   void IncrementRelatedActiveContentsCount();
  67
  68   // Decrease the number of active WebContentses using this SiteInstance. Note
  69   // that, unlike active_view_count, this does not count pending RVHs.
  70   void DecrementRelatedActiveContentsCount();
  71
  72   // Sets the global factory used to create new RenderProcessHosts.  It may be
  73   // NULL, in which case the default BrowserRenderProcessHost will be created
  74   // (this is the behavior if you don't call this function).  The factory must
  75   // be set back to NULL before it's destroyed; ownership is not transferred.
  76   static void set_render_process_host_factory(
  77       const RenderProcessHostFactory* rph_factory);
  78
  79   // Get the effective URL for the given actual URL.  This allows the
  80   // ContentBrowserClient to override the SiteInstance's site for certain URLs.
  81   // For example, Chrome uses this to replace hosted app URLs with extension
  82   // hosts.
  83   // Only public so that we can make a consistent process swap decision in
  84   // RenderFrameHostManager.
  85   static GURL GetEffectiveURL(BrowserContext* browser_context,
  86                               const GURL& url);
  87
  88  protected:
  89   friend class BrowsingInstance;
  90   friend class SiteInstance;
  91
  92   // Virtual to allow tests to extend it.
  93   virtual ~SiteInstanceImpl();
  94
  95   // Create a new SiteInstance.  Protected to give access to BrowsingInstance
  96   // and tests; most callers should use Create or GetRelatedSiteInstance
  97   // instead.
  98   explicit SiteInstanceImpl(BrowsingInstance* browsing_instance);
  99
 100  private:
 101   // RenderProcessHostObserver implementation.
 102   virtual void RenderProcessHostDestroyed(RenderProcessHost* host) OVERRIDE;
 103
 104   // Used to restrict a process' origin access rights.
 105   void LockToOrigin();
 106
 107   // An object used to construct RenderProcessHosts.
 108   static const RenderProcessHostFactory* g_render_process_host_factory_;
 109
 110   // The next available SiteInstance ID.
 111   static int32 next_site_instance_id_;
 112
 113   // A unique ID for this SiteInstance.
 114   int32 id_;
 115
 116   // The number of active views under this SiteInstance.
 117   size_t active_view_count_;
 118
 119   // BrowsingInstance to which this SiteInstance belongs.
 120   scoped_refptr<BrowsingInstance> browsing_instance_;
 121
 122   // Current RenderProcessHost that is rendering pages for this SiteInstance.
 123   // This pointer will only change once the RenderProcessHost is destructed.  It
 124   // will still remain the same even if the process crashes, since in that
 125   // scenario the RenderProcessHost remains the same.
 126   RenderProcessHost* process_;
 127
 128   // The web site that this SiteInstance is rendering pages for.
 129   GURL site_;
 130
 131   // Whether SetSite has been called.
 132   bool has_site_;
 133
 134   DISALLOW_COPY_AND_ASSIGN(SiteInstanceImpl);
 135 };
 136
 137 }  // namespace content
 138
 139 #endif  // CONTENT_BROWSER_SITE_INSTANCE_IMPL_H_