src/extensions/browser/api/system_storage/storage_info_provider.h

   1 // Copyright 2013 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 EXTENSIONS_BROWSER_API_SYSTEM_STORAGE_STORAGE_INFO_PROVIDER_H_
   6 #define EXTENSIONS_BROWSER_API_SYSTEM_STORAGE_STORAGE_INFO_PROVIDER_H_
   7
   8 #include <set>
   9
  10 #include "base/lazy_instance.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/observer_list_threadsafe.h"
  13 #include "base/timer/timer.h"
  14 #include "extensions/browser/api/system_info/system_info_provider.h"
  15 #include "extensions/common/api/system_storage.h"
  16
  17 namespace storage_monitor {
  18 class StorageInfo;
  19 }
  20
  21 namespace extensions {
  22
  23 namespace systeminfo {
  24
  25 // Build StorageUnitInfo struct from StorageInfo instance. The |unit|
  26 // parameter is the output value.
  27 void BuildStorageUnitInfo(const storage_monitor::StorageInfo& info,
  28                           core_api::system_storage::StorageUnitInfo* unit);
  29
  30 }  // namespace systeminfo
  31
  32 typedef std::vector<linked_ptr<core_api::system_storage::StorageUnitInfo> >
  33     StorageUnitInfoList;
  34
  35 class StorageInfoProvider : public SystemInfoProvider {
  36  public:
  37   typedef base::Callback<void(const std::string&, double)>
  38       GetStorageFreeSpaceCallback;
  39
  40   // Get the single shared instance of StorageInfoProvider.
  41   static StorageInfoProvider* Get();
  42
  43   // SystemInfoProvider implementations
  44   virtual void PrepareQueryOnUIThread() OVERRIDE;
  45   virtual void InitializeProvider(
  46       const base::Closure& do_query_info_callback) OVERRIDE;
  47
  48   virtual double GetStorageFreeSpaceFromTransientIdOnFileThread(
  49       const std::string& transient_id);
  50
  51   const StorageUnitInfoList& storage_unit_info_list() const;
  52
  53   static void InitializeForTesting(scoped_refptr<StorageInfoProvider> provider);
  54
  55  protected:
  56   StorageInfoProvider();
  57
  58   virtual ~StorageInfoProvider();
  59
  60   // Put all available storages' information into |info_|.
  61   void GetAllStoragesIntoInfoList();
  62
  63   // The last information filled up by QueryInfo and is accessed on multiple
  64   // threads, but the whole class is being guarded by SystemInfoProvider base
  65   // class.
  66   //
  67   // |info_| is accessed on the UI thread while |is_waiting_for_completion_| is
  68   // false and on the sequenced worker pool while |is_waiting_for_completion_|
  69   // is true.
  70   StorageUnitInfoList info_;
  71
  72  private:
  73   // SystemInfoProvider implementations.
  74   // Override to query the available capacity of all known storage devices on
  75   // the blocking pool, including fixed and removable devices.
  76   virtual bool QueryInfo() OVERRIDE;
  77
  78   static base::LazyInstance<scoped_refptr<StorageInfoProvider> > provider_;
  79
  80   DISALLOW_COPY_AND_ASSIGN(StorageInfoProvider);
  81 };
  82
  83 }  // namespace extensions
  84
  85 #endif  // EXTENSIONS_BROWSER_API_SYSTEM_STORAGE_STORAGE_INFO_PROVIDER_H_