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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 CHROME_BROWSER_PRERENDER_PRERENDER_TRACKER_H_ | 5 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_TRACKER_H_ |
6 #define CHROME_BROWSER_PRERENDER_PRERENDER_TRACKER_H_ | 6 #define CHROME_BROWSER_PRERENDER_PRERENDER_TRACKER_H_ |
7 | 7 |
8 #include <map> | 8 #include <map> |
9 #include <set> | 9 #include <set> |
| 10 #include <utility> |
10 #include <vector> | 11 #include <vector> |
11 | 12 |
12 #include "base/gtest_prod_util.h" | 13 #include "base/gtest_prod_util.h" |
13 #include "base/synchronization/lock.h" | 14 #include "base/synchronization/lock.h" |
14 #include "base/threading/non_thread_safe.h" | 15 #include "base/threading/non_thread_safe.h" |
| 16 #include "chrome/browser/prerender/prerender_contents.h" |
15 #include "chrome/browser/prerender/prerender_final_status.h" | 17 #include "chrome/browser/prerender/prerender_final_status.h" |
16 #include "googleurl/src/gurl.h" | 18 #include "googleurl/src/gurl.h" |
17 | 19 |
18 namespace prerender { | 20 namespace prerender { |
19 | 21 |
20 class PrerenderManager; | 22 class PrerenderManager; |
21 struct RenderViewInfo; | 23 struct RenderViewInfo; |
22 | 24 |
23 // PrerenderTracker is responsible for keeping track of all prerendering | 25 // PrerenderTracker is responsible for keeping track of all prerendering |
24 // RenderViews and their statuses. Its list is guaranteed to be up to date | 26 // RenderViews and their statuses. Its list is guaranteed to be up to date |
25 // and can be modified on any thread. | 27 // and can be modified on any thread. |
26 class PrerenderTracker { | 28 class PrerenderTracker : public base::NonThreadSafe, |
| 29 public PrerenderContents::Observer { |
27 public: | 30 public: |
28 PrerenderTracker(); | 31 PrerenderTracker(); |
29 ~PrerenderTracker(); | 32 virtual ~PrerenderTracker(); |
30 | 33 |
31 // Attempts to set the status of the specified RenderViewHost to | 34 // Attempts to set the status of the specified RenderViewHost to |
32 // FINAL_STATUS_USED. Returns true on success. Returns false if it has | 35 // FINAL_STATUS_USED. Returns true on success. Returns false if it has |
33 // already been cancelled for any reason or is no longer prerendering. | 36 // already been cancelled for any reason or is no longer prerendering. |
34 // Can only be called only on the IO thread. This method will not call | 37 // Can only be called only on the IO thread. This method will not call |
35 // PrerenderContents::set_final_status() on the corresponding | 38 // PrerenderContents::SetFinalStatus() on the corresponding PrerenderContents. |
36 // PrerenderContents. | |
37 // | 39 // |
38 // If it returns true, all subsequent calls to TryCancel and TryUse for the | 40 // If it returns true, all subsequent calls to TryCancel and TryUse for the |
39 // RenderView will return false. | 41 // RenderView will return false. |
40 bool TryUse(int child_id, int route_id); | 42 bool TryUse(int child_id, int route_id); |
41 | 43 |
42 // Attempts to cancel prerendering by the specified RenderView, setting the | 44 // Attempts to cancel prerendering by the specified RenderView, setting the |
43 // FinalStatus to |final_status|. Returns true if the specified prerender has | 45 // FinalStatus to |final_status|. Returns true if the specified prerender has |
44 // been cancelled, either as a result of this call or for any other reason. | 46 // been cancelled, either as a result of this call or for any other reason. |
45 // If the call results in cancelling a PrerenderContents, a task to destroy | 47 // If the call results in cancelling a PrerenderContents, a task to destroy |
46 // it is also posted to the UI thread. | 48 // it is also posted to the UI thread. |
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74 FRIEND_TEST_ALL_PREFIXES(PrerenderTrackerTest, PrerenderTrackerCancelledOnIO); | 76 FRIEND_TEST_ALL_PREFIXES(PrerenderTrackerTest, PrerenderTrackerCancelledOnIO); |
75 FRIEND_TEST_ALL_PREFIXES(PrerenderTrackerTest, PrerenderTrackerCancelledFast); | 77 FRIEND_TEST_ALL_PREFIXES(PrerenderTrackerTest, PrerenderTrackerCancelledFast); |
76 FRIEND_TEST_ALL_PREFIXES(PrerenderTrackerTest, PrerenderTrackerMultiple); | 78 FRIEND_TEST_ALL_PREFIXES(PrerenderTrackerTest, PrerenderTrackerMultiple); |
77 | 79 |
78 typedef std::pair<int, int> ChildRouteIdPair; | 80 typedef std::pair<int, int> ChildRouteIdPair; |
79 // Map of child/route id pairs to final statuses. | 81 // Map of child/route id pairs to final statuses. |
80 typedef std::map<ChildRouteIdPair, RenderViewInfo> FinalStatusMap; | 82 typedef std::map<ChildRouteIdPair, RenderViewInfo> FinalStatusMap; |
81 // Set of child/route id pairs that may be prerendering. | 83 // Set of child/route id pairs that may be prerendering. |
82 typedef std::set<ChildRouteIdPair> PossiblyPrerenderingChildRouteIdPairs; | 84 typedef std::set<ChildRouteIdPair> PossiblyPrerenderingChildRouteIdPairs; |
83 | 85 |
84 // Must be called when a RenderView starts prerendering, before the first | 86 // From PrerenderContents::Observer: |
85 // navigation starts to avoid any races. | 87 virtual void OnPrerenderStart(PrerenderContents* prerender_contents) OVERRIDE; |
86 void OnPrerenderingStarted(int child_id, int route_id, | 88 virtual void OnPrerenderStop(PrerenderContents* prerender_contents) OVERRIDE; |
87 PrerenderManager* prerender_manager); | |
88 | |
89 // Must be called when a RenderView stops prerendering, either because the | |
90 // RenderView was used or prerendering was cancelled and it is being | |
91 // destroyed. | |
92 void OnPrerenderingFinished(int child_id, int route_id); | |
93 | 89 |
94 // Attempts to set the FinalStatus of the specified RenderView to | 90 // Attempts to set the FinalStatus of the specified RenderView to |
95 // |desired_final_status|. If non-NULL, |actual_final_status| is set to the | 91 // |desired_final_status|. If non-NULL, |actual_final_status| is set to the |
96 // FinalStatus of the RenderView. | 92 // FinalStatus of the RenderView. |
97 // | 93 // |
98 // If the FinalStatus of the RenderView is successfully set, returns true and | 94 // If the FinalStatus of the RenderView is successfully set, returns true and |
99 // sets |actual_final_status| to |desired_final_status|. | 95 // sets |actual_final_status| to |desired_final_status|. |
100 // | 96 // |
101 // If the FinalStatus of the RenderView was already set, returns false and | 97 // If the FinalStatus of the RenderView was already set, returns false and |
102 // sets |actual_final_status| to the actual FinalStatus of the RenderView. | 98 // sets |actual_final_status| to the actual FinalStatus of the RenderView. |
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131 // the IO thread. May contain entries that have since been displayed. Only | 127 // the IO thread. May contain entries that have since been displayed. Only |
132 // used to prevent locking when not needed. | 128 // used to prevent locking when not needed. |
133 PossiblyPrerenderingChildRouteIdPairs possibly_prerendering_io_thread_set_; | 129 PossiblyPrerenderingChildRouteIdPairs possibly_prerendering_io_thread_set_; |
134 | 130 |
135 DISALLOW_COPY_AND_ASSIGN(PrerenderTracker); | 131 DISALLOW_COPY_AND_ASSIGN(PrerenderTracker); |
136 }; | 132 }; |
137 | 133 |
138 } // namespace prerender | 134 } // namespace prerender |
139 | 135 |
140 #endif // CHROME_BROWSER_PRERENDER_PRERENDER_TRACKER_H_ | 136 #endif // CHROME_BROWSER_PRERENDER_PRERENDER_TRACKER_H_ |
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