chromecast/common/chromecast_config.h

   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
   3 // found in the LICENSE file.
   4 //
   5 // Chromecast-specific configurations retrieved from and stored into a given
   6 // configuration file.
   7
   8 #ifndef CHROMECAST_COMMON_CHROMECAST_CONFIG_H_
   9 #define CHROMECAST_COMMON_CHROMECAST_CONFIG_H_
  10
  11 #include <string>
  12
  13 #include "base/files/file_path.h"
  14 #include "base/memory/ref_counted.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/prefs/pref_service.h"
  17 #include "base/threading/sequenced_worker_pool.h"
  18 #include "base/threading/thread_checker.h"
  19
  20 class PrefRegistrySimple;
  21
  22 namespace chromecast {
  23
  24 // Manages configuration for Chromecast via PrefService.
  25 // It uses JsonPrefStore internally and/so the format of config file is same to
  26 // that of JsonPrefStore.
  27 // It is NOT thread-safe; all functions must be run on the same thread as
  28 // the object is created.
  29 class ChromecastConfig {
  30  public:
  31   // Creates new singleton instance of ChromecastConfig.
  32   static void Create(PrefRegistrySimple* registry);
  33
  34   // Returns the singleton instance of ChromecastConfig.
  35   static ChromecastConfig* GetInstance();
  36
  37   // Saves configs into configuration file.
  38   void Save() const;
  39
  40   // Returns string value for |key|, if present.
  41   const std::string GetValue(const std::string& key) const;
  42
  43   // Returns integer value for |key|, if present.
  44   const int GetIntValue(const std::string& key) const;
  45
  46   // Sets new string value for |key|.
  47   void SetValue(const std::string& key, const std::string& value) const;
  48
  49   // Sets new int value for |key|.
  50   void SetIntValue(const std::string& key, int value) const;
  51
  52   // Whether or not a value has been set for |key|.
  53   bool HasValue(const std::string& key) const;
  54
  55   scoped_refptr<base::SequencedWorkerPool> worker_pool() const {
  56     return worker_pool_;
  57   }
  58
  59   PrefService* pref_service() const { return pref_service_.get(); }
  60
  61  private:
  62   ChromecastConfig();
  63   ~ChromecastConfig();
  64
  65   // Loads configs from config file. Returns true if successful.
  66   bool Load(PrefRegistrySimple* registry);
  67
  68   // Registers any needed preferences for the current platform.
  69   void RegisterPlatformPrefs(PrefRegistrySimple* registry);
  70
  71   // Global singleton instance.
  72   static ChromecastConfig* g_instance_;
  73
  74   const base::FilePath config_path_;
  75   const scoped_refptr<base::SequencedWorkerPool> worker_pool_;
  76   scoped_ptr<PrefService> pref_service_;
  77
  78   base::ThreadChecker thread_checker_;
  79
  80   DISALLOW_COPY_AND_ASSIGN(ChromecastConfig);
  81 };
  82
  83 }  // namespace chromecast
  84
  85 #endif  // CHROMECAST_COMMON_CHROMECAST_CONFIG_H_