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Side by Side Diff: content/public/browser/site_instance.h

Issue 10073023: TabContents -> WebContentsImpl, part 14. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 8 years, 8 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef CONTENT_PUBLIC_BROWSER_SITE_INSTANCE_H_ 5 #ifndef CONTENT_PUBLIC_BROWSER_SITE_INSTANCE_H_
6 #define CONTENT_PUBLIC_BROWSER_SITE_INSTANCE_H_ 6 #define CONTENT_PUBLIC_BROWSER_SITE_INSTANCE_H_
7 #pragma once 7 #pragma once
8 8
9 #include "base/basictypes.h" 9 #include "base/basictypes.h"
10 #include "base/memory/ref_counted.h" 10 #include "base/memory/ref_counted.h"
11 #include "content/common/content_export.h" 11 #include "content/common/content_export.h"
12 #include "googleurl/src/gurl.h" 12 #include "googleurl/src/gurl.h"
13 13
14 class BrowsingInstance; 14 class BrowsingInstance;
15 15
16 namespace content { 16 namespace content {
17 class BrowserContext; 17 class BrowserContext;
18 class RenderProcessHost; 18 class RenderProcessHost;
19 19
20 /////////////////////////////////////////////////////////////////////////////// 20 ///////////////////////////////////////////////////////////////////////////////
21 // SiteInstance interface. 21 // SiteInstance interface.
22 // 22 //
23 // A SiteInstance is a data structure that is associated with all pages in a 23 // A SiteInstance is a data structure that is associated with all pages in a
24 // given instance of a web site. Here, a web site is identified by its 24 // given instance of a web site. Here, a web site is identified by its
25 // registered domain name and scheme. An instance includes all pages 25 // registered domain name and scheme. An instance includes all pages
26 // that are connected (i.e., either a user or a script navigated from one 26 // that are connected (i.e., either a user or a script navigated from one
27 // to the other). We represent instances using the BrowsingInstance class. 27 // to the other). We represent instances using the BrowsingInstance class.
28 // 28 //
29 // In --process-per-tab, one SiteInstance is created for each tab (i.e., in the 29 // In --process-per-tab, one SiteInstance is created for each tab (i.e., in the
30 // TabContents constructor), unless the tab is created by script (i.e., in 30 // WebContents constructor), unless the tab is created by script (i.e., in
31 // TabContents::CreateNewView). This corresponds to one process per 31 // WebContents::CreateNewView). This corresponds to one process per
32 // BrowsingInstance. 32 // BrowsingInstance.
33 // 33 //
34 // In process-per-site-instance (the current default process model), 34 // In process-per-site-instance (the current default process model),
35 // SiteInstances are created (1) when the user manually creates a new tab 35 // SiteInstances are created (1) when the user manually creates a new tab
36 // (which also creates a new BrowsingInstance), and (2) when the user navigates 36 // (which also creates a new BrowsingInstance), and (2) when the user navigates
37 // across site boundaries (which uses the same BrowsingInstance). If the user 37 // across site boundaries (which uses the same BrowsingInstance). If the user
38 // navigates within a site, or opens links in new tabs within a site, the same 38 // navigates within a site, or opens links in new tabs within a site, the same
39 // SiteInstance is used. 39 // SiteInstance is used.
40 // 40 //
41 // In --process-per-site, we consolidate all SiteInstances for a given site, 41 // In --process-per-site, we consolidate all SiteInstances for a given site,
42 // throughout the entire browser context. This ensures that only one process 42 // throughout the entire browser context. This ensures that only one process
43 // will be dedicated to each site. 43 // will be dedicated to each site.
44 // 44 //
45 // Each NavigationEntry for a TabContents points to the SiteInstance that 45 // Each NavigationEntry for a WebContents points to the SiteInstance that
46 // rendered it. Each RenderViewHost also points to the SiteInstance that it is 46 // rendered it. Each RenderViewHost also points to the SiteInstance that it is
47 // associated with. A SiteInstance keeps track of the number of these 47 // associated with. A SiteInstance keeps track of the number of these
48 // references and deletes itself when the count goes to zero. This means that 48 // references and deletes itself when the count goes to zero. This means that
49 // a SiteInstance is only live as long as it is accessible, either from new 49 // a SiteInstance is only live as long as it is accessible, either from new
50 // tabs with no NavigationEntries or in NavigationEntries in the history. 50 // tabs with no NavigationEntries or in NavigationEntries in the history.
51 // 51 //
52 /////////////////////////////////////////////////////////////////////////////// 52 ///////////////////////////////////////////////////////////////////////////////
53 class CONTENT_EXPORT SiteInstance : public base::RefCounted<SiteInstance> { 53 class CONTENT_EXPORT SiteInstance : public base::RefCounted<SiteInstance> {
54 public: 54 public:
55 // Returns a unique ID for this SiteInstance. 55 // Returns a unique ID for this SiteInstance.
(...skipping 57 matching lines...) Expand 10 before | Expand all | Expand 10 after
113 protected: 113 protected:
114 friend class base::RefCounted<SiteInstance>; 114 friend class base::RefCounted<SiteInstance>;
115 115
116 SiteInstance() {} 116 SiteInstance() {}
117 virtual ~SiteInstance() {} 117 virtual ~SiteInstance() {}
118 }; 118 };
119 119
120 } // namespace content. 120 } // namespace content.
121 121
122 #endif // CONTENT_PUBLIC_BROWSER_SITE_INSTANCE_H_ 122 #endif // CONTENT_PUBLIC_BROWSER_SITE_INSTANCE_H_
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