components/cronet/android/cronet_in_memory_pref_store.h

   1 // Copyright 2015 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 COMPONENTS_CRONET_ANDROID_CRONET_IN_MEMORY_PREF_STORE_H_
   6 #define COMPONENTS_CRONET_ANDROID_CRONET_IN_MEMORY_PREF_STORE_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/observer_list.h"
  14 #include "base/prefs/persistent_pref_store.h"
  15 #include "base/prefs/pref_value_map.h"
  16
  17 namespace base {
  18 class Value;
  19 }
  20
  21 // A light-weight prefstore implementation that keeps preferences
  22 // in a memory backed store. This is not a persistent prefstore.
  23 // TODO(bengr): Move to base/prefs or some other shared location.
  24 class CronetInMemoryPrefStore : public PersistentPrefStore {
  25  public:
  26   CronetInMemoryPrefStore();
  27
  28   // PrefStore overrides:
  29   bool GetValue(const std::string& key,
  30                 const base::Value** result) const override;
  31   void AddObserver(PrefStore::Observer* observer) override;
  32   void RemoveObserver(PrefStore::Observer* observer) override;
  33   bool HasObservers() const override;
  34   bool IsInitializationComplete() const override;
  35
  36   // PersistentPrefStore overrides:
  37   bool GetMutableValue(const std::string& key, base::Value** result) override;
  38   void ReportValueChanged(const std::string& key, uint32 flags) override;
  39   void SetValue(const std::string& key,
  40                 scoped_ptr<base::Value> value,
  41                 uint32 flags) override;
  42   void SetValueSilently(const std::string& key,
  43                         scoped_ptr<base::Value> value,
  44                         uint32 flags) override;
  45   void RemoveValue(const std::string& key, uint32 flags) override;
  46   bool ReadOnly() const override;
  47   PrefReadError GetReadError() const override;
  48   PersistentPrefStore::PrefReadError ReadPrefs() override;
  49   void ReadPrefsAsync(ReadErrorDelegate* error_delegate) override;
  50   void CommitPendingWrite() override {}
  51   void SchedulePendingLossyWrites() override {}
  52
  53  private:
  54   ~CronetInMemoryPrefStore() override;
  55
  56   // Stores the preference values.
  57   PrefValueMap prefs_;
  58
  59   base::ObserverList<PrefStore::Observer, true> observers_;
  60
  61   DISALLOW_COPY_AND_ASSIGN(CronetInMemoryPrefStore);
  62 };
  63
  64 #endif  // COMPONENTS_CRONET_ANDROID_CRONET_IN_MEMORY_PREF_STORE_H_