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