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      active_contents_count_(0u) {
20}
21
22bool 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
30SiteInstance* 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
48void 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
67void 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
84BrowsingInstance::~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