content/browser/browsing_instance.cc

   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 #include "content/browser/browsing_instance.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/logging.h"
   9 #include "content/browser/site_instance_impl.h"
  10 #include "content/public/browser/browser_context.h"
  11 #include "content/public/browser/content_browser_client.h"
  12 #include "content/public/common/content_switches.h"
  13 #include "content/public/common/url_constants.h"
  14
  15 namespace content {
  16
  17 BrowsingInstance::BrowsingInstance(BrowserContext* browser_context)
  18     : browser_context_(browser_context),
  19       active_contents_count_(0u) {
  20 }
  21
  22 bool BrowsingInstance::HasSiteInstance(const GURL& url) {
  23   std::string site =
  24       SiteInstanceImpl::GetSiteForURL(browser_context_, url)
  25           .possibly_invalid_spec();
  26
  27   return site_instance_map_.find(site) != site_instance_map_.end();
  28 }
  29
  30 SiteInstance* BrowsingInstance::GetSiteInstanceForURL(const GURL& url) {
  31   std::string site =
  32       SiteInstanceImpl::GetSiteForURL(browser_context_, url)
  33           .possibly_invalid_spec();
  34
  35   SiteInstanceMap::iterator i = site_instance_map_.find(site);
  36   if (i != site_instance_map_.end())
  37     return i->second;
  38
  39
  40   // No current SiteInstance for this site, so let's create one.
  41   SiteInstanceImpl* instance = new SiteInstanceImpl(this);
  42
  43   // Set the site of this new SiteInstance, which will register it with us.
  44   instance->SetSite(url);
  45   return instance;
  46 }
  47
  48 void BrowsingInstance::RegisterSiteInstance(SiteInstance* site_instance) {
  49   DCHECK(static_cast<SiteInstanceImpl*>(site_instance)
  50              ->browsing_instance_.get() ==
  51          this);
  52   DCHECK(static_cast<SiteInstanceImpl*>(site_instance)->HasSite());
  53   std::string site = site_instance->GetSiteURL().possibly_invalid_spec();
  54
  55   // Only register if we don't have a SiteInstance for this site already.
  56   // It's possible to have two SiteInstances point to the same site if two
  57   // tabs are navigated there at the same time.  (We don't call SetSite or
  58   // register them until DidNavigate.)  If there is a previously existing
  59   // SiteInstance for this site, we just won't register the new one.
  60   SiteInstanceMap::iterator i = site_instance_map_.find(site);
  61   if (i == site_instance_map_.end()) {
  62     // Not previously registered, so register it.
  63     site_instance_map_[site] = site_instance;
  64   }
  65 }
  66
  67 void BrowsingInstance::UnregisterSiteInstance(SiteInstance* site_instance) {
  68   DCHECK(static_cast<SiteInstanceImpl*>(site_instance)
  69              ->browsing_instance_.get() ==
  70          this);
  71   DCHECK(static_cast<SiteInstanceImpl*>(site_instance)->HasSite());
  72   std::string site = site_instance->GetSiteURL().possibly_invalid_spec();
  73
  74   // Only unregister the SiteInstance if it is the same one that is registered
  75   // for the site.  (It might have been an unregistered SiteInstance.  See the
  76   // comments in RegisterSiteInstance.)
  77   SiteInstanceMap::iterator i = site_instance_map_.find(site);
  78   if (i != site_instance_map_.end() && i->second == site_instance) {
  79     // Matches, so erase it.
  80     site_instance_map_.erase(i);
  81   }
  82 }
  83
  84 BrowsingInstance::~BrowsingInstance() {
  85   // We should only be deleted when all of the SiteInstances that refer to
  86   // us are gone.
  87   DCHECK(site_instance_map_.empty());
  88   DCHECK_EQ(0u, active_contents_count_);
  89 }
  90
  91 }  // namespace content