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Side by Side Diff: components/prefs/pref_notifier_impl.h

Issue 1645073005: Revert of Move base/prefs to components/prefs (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 10 months ago
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1 // Copyright (c) 2011 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 #ifndef BASE_PREFS_PREF_NOTIFIER_IMPL_H_
6 #define BASE_PREFS_PREF_NOTIFIER_IMPL_H_
7
8 #include <list>
9 #include <string>
10
11 #include "base/callback.h"
12 #include "base/compiler_specific.h"
13 #include "base/containers/hash_tables.h"
14 #include "base/macros.h"
15 #include "base/observer_list.h"
16 #include "base/prefs/base_prefs_export.h"
17 #include "base/prefs/pref_notifier.h"
18 #include "base/prefs/pref_observer.h"
19 #include "base/threading/thread_checker.h"
20
21 class PrefService;
22
23 // The PrefNotifier implementation used by the PrefService.
24 class BASE_PREFS_EXPORT PrefNotifierImpl
25 : public NON_EXPORTED_BASE(PrefNotifier) {
26 public:
27 PrefNotifierImpl();
28 explicit PrefNotifierImpl(PrefService* pref_service);
29 ~PrefNotifierImpl() override;
30
31 // If the pref at the given path changes, we call the observer's
32 // OnPreferenceChanged method.
33 void AddPrefObserver(const std::string& path, PrefObserver* observer);
34 void RemovePrefObserver(const std::string& path, PrefObserver* observer);
35
36 // We run the callback once, when initialization completes. The bool
37 // parameter will be set to true for successful initialization,
38 // false for unsuccessful.
39 void AddInitObserver(base::Callback<void(bool)> observer);
40
41 void SetPrefService(PrefService* pref_service);
42
43 protected:
44 // PrefNotifier overrides.
45 void OnPreferenceChanged(const std::string& pref_name) override;
46 void OnInitializationCompleted(bool succeeded) override;
47
48 // A map from pref names to a list of observers. Observers get fired in the
49 // order they are added. These should only be accessed externally for unit
50 // testing.
51 typedef base::ObserverList<PrefObserver> PrefObserverList;
52 typedef base::hash_map<std::string, PrefObserverList*> PrefObserverMap;
53
54 typedef std::list<base::Callback<void(bool)>> PrefInitObserverList;
55
56 const PrefObserverMap* pref_observers() const { return &pref_observers_; }
57
58 private:
59 // For the given pref_name, fire any observer of the pref. Virtual so it can
60 // be mocked for unit testing.
61 virtual void FireObservers(const std::string& path);
62
63 // Weak reference; the notifier is owned by the PrefService.
64 PrefService* pref_service_;
65
66 PrefObserverMap pref_observers_;
67 PrefInitObserverList init_observers_;
68
69 base::ThreadChecker thread_checker_;
70
71 DISALLOW_COPY_AND_ASSIGN(PrefNotifierImpl);
72 };
73
74 #endif // BASE_PREFS_PREF_NOTIFIER_IMPL_H_
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