74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_PREFS_PREF_NOTIFIER_IMPL_H_
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#define BASE_PREFS_PREF_NOTIFIER_IMPL_H_
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#include <list>
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#include <string>
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#include "base/callback.h"
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#include "base/compiler_specific.h"
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#include "base/containers/hash_tables.h"
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#include "base/observer_list.h"
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#include "base/prefs/base_prefs_export.h"
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#include "base/prefs/pref_notifier.h"
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#include "base/prefs/pref_observer.h"
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#include "base/threading/thread_checker.h"
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class PrefService;
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// The PrefNotifier implementation used by the PrefService.
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class BASE_PREFS_EXPORT PrefNotifierImpl
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: public NON_EXPORTED_BASE(PrefNotifier) {
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public:
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PrefNotifierImpl();
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explicit PrefNotifierImpl(PrefService* pref_service);
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virtual ~PrefNotifierImpl();
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// If the pref at the given path changes, we call the observer's
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// OnPreferenceChanged method.
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void AddPrefObserver(const char* path, PrefObserver* observer);
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void RemovePrefObserver(const char* path, PrefObserver* observer);
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// We run the callback once, when initialization completes. The bool
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// parameter will be set to true for successful initialization,
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// false for unsuccessful.
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void AddInitObserver(base::Callback<void(bool)> observer);
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void SetPrefService(PrefService* pref_service);
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protected:
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// PrefNotifier overrides.
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virtual void OnPreferenceChanged(const std::string& pref_name) OVERRIDE;
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virtual void OnInitializationCompleted(bool succeeded) OVERRIDE;
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// A map from pref names to a list of observers. Observers get fired in the
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// order they are added. These should only be accessed externally for unit
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// testing.
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typedef ObserverList<PrefObserver> PrefObserverList;
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typedef base::hash_map<std::string, PrefObserverList*> PrefObserverMap;
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typedef std::list<base::Callback<void(bool)> > PrefInitObserverList;
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const PrefObserverMap* pref_observers() const { return &pref_observers_; }
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private:
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// For the given pref_name, fire any observer of the pref. Virtual so it can
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// be mocked for unit testing.
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virtual void FireObservers(const std::string& path);
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// Weak reference; the notifier is owned by the PrefService.
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PrefService* pref_service_;
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PrefObserverMap pref_observers_;
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PrefInitObserverList init_observers_;
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base::ThreadChecker thread_checker_;
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DISALLOW_COPY_AND_ASSIGN(PrefNotifierImpl);
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};
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#endif // BASE_PREFS_PREF_NOTIFIER_IMPL_H_
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