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      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_
     86