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| 1 // Copyright 2017 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 SERVICES_PREFERENCES_PUBLIC_CPP_PREF_STORE_CLIENT_H_ |
| 6 #define SERVICES_PREFERENCES_PUBLIC_CPP_PREF_STORE_CLIENT_H_ |
| 7 |
| 8 #include <string> |
| 9 |
| 10 #include "base/macros.h" |
| 11 #include "base/observer_list.h" |
| 12 #include "base/values.h" |
| 13 #include "components/prefs/pref_store.h" |
| 14 #include "components/prefs/pref_value_map.h" |
| 15 #include "mojo/public/cpp/bindings/binding.h" |
| 16 #include "services/preferences/public/cpp/pref_store_manager_impl.h" |
| 17 #include "services/preferences/public/interfaces/preferences.mojom.h" |
| 18 |
| 19 namespace prefs { |
| 20 |
| 21 // TODO(tibell): Make PrefObserverStore use PrefStoreClient as a base class. |
| 22 |
| 23 // An implementation of PrefStore which uses prefs::mojom::PrefStore as |
| 24 // the backing store of the preferences. |
| 25 // |
| 26 // PrefStoreClient provides synchronous access to the preferences stored by the |
| 27 // backing store by caching them locally. |
| 28 class PrefStoreClient : public ::PrefStore, public mojom::PrefStoreObserver { |
| 29 public: |
| 30 explicit PrefStoreClient(mojom::PrefStoreConnectionPtr connection); |
| 31 |
| 32 // PrefStore: |
| 33 void AddObserver(PrefStore::Observer* observer) override; |
| 34 void RemoveObserver(PrefStore::Observer* observer) override; |
| 35 bool HasObservers() const override; |
| 36 bool IsInitializationComplete() const override; |
| 37 bool GetValue(const std::string& key, |
| 38 const base::Value** result) const override; |
| 39 std::unique_ptr<base::DictionaryValue> GetValues() const override; |
| 40 |
| 41 private: |
| 42 friend class PrefStoreClientTest; |
| 43 |
| 44 ~PrefStoreClient() override; |
| 45 |
| 46 void OnConnected(); |
| 47 |
| 48 // prefs::mojom::PreferenceObserver: |
| 49 void OnPrefChanged(const std::string& key, |
| 50 std::unique_ptr<base::Value> value) override; |
| 51 void OnInitializationCompleted(bool succeeded) override; |
| 52 |
| 53 // Cached preferences. |
| 54 std::unique_ptr<base::DictionaryValue> cached_prefs_; |
| 55 |
| 56 base::ObserverList<PrefStore::Observer, true> observers_; |
| 57 |
| 58 // Has the PrefStore we're observing been initialized? |
| 59 bool initialized_; |
| 60 |
| 61 mojo::Binding<mojom::PrefStoreObserver> observer_binding_; |
| 62 |
| 63 DISALLOW_COPY_AND_ASSIGN(PrefStoreClient); |
| 64 }; |
| 65 |
| 66 } // namespace prefs |
| 67 |
| 68 #endif // SERVICES_PREFERENCES_PUBLIC_CPP_PREF_STORE_CLIENT_H_ |
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