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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 
BrowsingInstance(BrowserContext * browser_context)17 BrowsingInstance::BrowsingInstance(BrowserContext* browser_context)
18     : browser_context_(browser_context),
19       active_contents_count_(0u) {
20 }
21 
HasSiteInstance(const GURL & url)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 
GetSiteInstanceForURL(const GURL & url)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 
RegisterSiteInstance(SiteInstance * site_instance)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 
UnregisterSiteInstance(SiteInstance * site_instance)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 
~BrowsingInstance()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
92