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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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 WEBKIT_BROWSER_QUOTA_STORAGE_MONITOR_H_ | 5 #include "storage/browser/quota/storage_monitor.h" |
6 #define WEBKIT_BROWSER_QUOTA_STORAGE_MONITOR_H_ | |
7 | |
8 #include <map> | |
9 | |
10 #include "base/memory/weak_ptr.h" | |
11 #include "base/time/time.h" | |
12 #include "base/timer/timer.h" | |
13 #include "webkit/browser/quota/storage_observer.h" | |
14 | |
15 namespace content { | |
16 class StorageMonitorTestBase; | |
17 } | |
18 | |
19 namespace storage { | |
20 | |
21 class QuotaManager; | |
22 | |
23 // This class dispatches storage events to observers of a common | |
24 // StorageObserver::Filter. | |
25 class STORAGE_EXPORT_PRIVATE StorageObserverList { | |
26 public: | |
27 StorageObserverList(); | |
28 virtual ~StorageObserverList(); | |
29 | |
30 // Adds/removes an observer. | |
31 void AddObserver(StorageObserver* observer, | |
32 const StorageObserver::MonitorParams& params); | |
33 void RemoveObserver(StorageObserver* observer); | |
34 | |
35 // Returns the number of observers. | |
36 int ObserverCount() const; | |
37 | |
38 // Forwards a storage change to observers. The event may be dispatched | |
39 // immediately to an observer or after a delay, depending on the desired event | |
40 // rate of the observer. | |
41 void OnStorageChange(const StorageObserver::Event& event); | |
42 | |
43 // Dispatch an event to observers that require it. | |
44 void MaybeDispatchEvent(const StorageObserver::Event& event); | |
45 | |
46 // Ensure the specified observer receives the next dispatched event. | |
47 void ScheduleUpdateForObserver(StorageObserver* observer); | |
48 | |
49 private: | |
50 struct STORAGE_EXPORT_PRIVATE ObserverState { | |
51 GURL origin; | |
52 base::TimeTicks last_notification_time; | |
53 base::TimeDelta rate; | |
54 bool requires_update; | |
55 | |
56 ObserverState(); | |
57 }; | |
58 typedef std::map<StorageObserver*, ObserverState> StorageObserverStateMap; | |
59 | |
60 void DispatchPendingEvent(); | |
61 | |
62 StorageObserverStateMap observers_; | |
63 base::OneShotTimer<StorageObserverList> notification_timer_; | |
64 StorageObserver::Event pending_event_; | |
65 | |
66 friend class content::StorageMonitorTestBase; | |
67 | |
68 DISALLOW_COPY_AND_ASSIGN(StorageObserverList); | |
69 }; | |
70 | |
71 | |
72 // Manages the storage observers of a common host. Caches the usage and quota of | |
73 // the host to avoid accumulating for every change. | |
74 class STORAGE_EXPORT_PRIVATE HostStorageObservers { | |
75 public: | |
76 explicit HostStorageObservers(QuotaManager* quota_manager); | |
77 virtual ~HostStorageObservers(); | |
78 | |
79 bool is_initialized() const { return initialized_; } | |
80 | |
81 // Adds/removes an observer. | |
82 void AddObserver( | |
83 StorageObserver* observer, | |
84 const StorageObserver::MonitorParams& params); | |
85 void RemoveObserver(StorageObserver* observer); | |
86 bool ContainsObservers() const; | |
87 | |
88 // Handles a usage change. | |
89 void NotifyUsageChange(const StorageObserver::Filter& filter, int64 delta); | |
90 | |
91 private: | |
92 void StartInitialization(const StorageObserver::Filter& filter); | |
93 void GotHostUsageAndQuota(const StorageObserver::Filter& filter, | |
94 QuotaStatusCode status, | |
95 int64 usage, | |
96 int64 quota); | |
97 void DispatchEvent(const StorageObserver::Filter& filter, bool is_update); | |
98 | |
99 QuotaManager* quota_manager_; | |
100 StorageObserverList observers_; | |
101 | |
102 // Flags used during initialization of the cached properties. | |
103 bool initialized_; | |
104 bool initializing_; | |
105 bool event_occurred_before_init_; | |
106 int64 usage_deltas_during_init_; | |
107 | |
108 // Cached accumulated usage and quota for the host. | |
109 int64 cached_usage_; | |
110 int64 cached_quota_; | |
111 | |
112 base::WeakPtrFactory<HostStorageObservers> weak_factory_; | |
113 | |
114 friend class content::StorageMonitorTestBase; | |
115 | |
116 DISALLOW_COPY_AND_ASSIGN(HostStorageObservers); | |
117 }; | |
118 | |
119 | |
120 // Manages the observers of a common storage type. | |
121 class STORAGE_EXPORT_PRIVATE StorageTypeObservers { | |
122 public: | |
123 explicit StorageTypeObservers(QuotaManager* quota_manager); | |
124 virtual ~StorageTypeObservers(); | |
125 | |
126 // Adds and removes an observer. | |
127 void AddObserver(StorageObserver* observer, | |
128 const StorageObserver::MonitorParams& params); | |
129 void RemoveObserver(StorageObserver* observer); | |
130 void RemoveObserverForFilter(StorageObserver* observer, | |
131 const StorageObserver::Filter& filter); | |
132 | |
133 // Returns the observers of a specific host. | |
134 const HostStorageObservers* GetHostObservers(const std::string& host) const; | |
135 | |
136 // Handles a usage change. | |
137 void NotifyUsageChange(const StorageObserver::Filter& filter, int64 delta); | |
138 | |
139 private: | |
140 typedef std::map<std::string, HostStorageObservers*> HostObserversMap; | |
141 | |
142 QuotaManager* quota_manager_; | |
143 HostObserversMap host_observers_map_; | |
144 | |
145 DISALLOW_COPY_AND_ASSIGN(StorageTypeObservers); | |
146 }; | |
147 | |
148 | |
149 // Storage monitor manages observers and dispatches storage events to them. | |
150 class STORAGE_EXPORT_PRIVATE StorageMonitor { | |
151 public: | |
152 explicit StorageMonitor(QuotaManager* quota_manager); | |
153 virtual ~StorageMonitor(); | |
154 | |
155 // Adds and removes an observer. | |
156 void AddObserver(StorageObserver* observer, | |
157 const StorageObserver::MonitorParams& params); | |
158 void RemoveObserver(StorageObserver* observer); | |
159 void RemoveObserverForFilter(StorageObserver* observer, | |
160 const StorageObserver::Filter& filter); | |
161 | |
162 // Returns the observers of a specific storage type. | |
163 const StorageTypeObservers* GetStorageTypeObservers( | |
164 StorageType storage_type) const; | |
165 | |
166 // Handles a usage change. | |
167 void NotifyUsageChange(const StorageObserver::Filter& filter, int64 delta); | |
168 | |
169 private: | |
170 typedef std::map<StorageType, StorageTypeObservers*> StorageTypeObserversMap; | |
171 | |
172 QuotaManager* quota_manager_; | |
173 StorageTypeObserversMap storage_type_observers_map_; | |
174 | |
175 DISALLOW_COPY_AND_ASSIGN(StorageMonitor); | |
176 }; | |
177 | |
178 } // namespace storage | |
179 | |
180 #endif // WEBKIT_BROWSER_QUOTA_STORAGE_MONITOR_H_ | |
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