chrome/browser/browsing_data/browsing_data_quota_helper.h

   1 // Copyright (c) 2012 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 CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_QUOTA_HELPER_H_
   6 #define CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_QUOTA_HELPER_H_
   7
   8 #include <list>
   9 #include <string>
  10
  11 #include "base/callback.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/sequenced_task_runner_helpers.h"
  14 #include "storage/common/quota/quota_types.h"
  15
  16
  17 namespace base {
  18 class SingleThreadTaskRunner;
  19 }  // namespace base
  20
  21 class BrowsingDataQuotaHelper;
  22 class Profile;
  23
  24 struct BrowsingDataQuotaHelperDeleter {
  25   static void Destruct(const BrowsingDataQuotaHelper* helper);
  26 };
  27
  28 // This class is an interface class to bridge between Cookies Tree and Unified
  29 // Quota System.  This class provides a way to get usage and quota information
  30 // through the instance.
  31 //
  32 // Call Create to create an instance for a profile and call StartFetching with
  33 // a callback to fetch information asynchronously.
  34 //
  35 // Parallel fetching is not allowed, a fetching task should start after end of
  36 // previous task.  All method of this class should called from UI thread.
  37 class BrowsingDataQuotaHelper
  38     : public base::RefCountedThreadSafe<BrowsingDataQuotaHelper,
  39                                         BrowsingDataQuotaHelperDeleter> {
  40  public:
  41   // QuotaInfo contains host-based quota and usage information for persistent
  42   // and temporary storage.
  43   struct QuotaInfo {
  44     QuotaInfo();
  45     explicit QuotaInfo(const std::string& host);
  46     QuotaInfo(const std::string& host,
  47               int64 temporary_usage,
  48               int64 persistent_usage,
  49               int64 syncable_usage);
  50     ~QuotaInfo();
  51
  52     // Certain versions of MSVC 2008 have bad implementations of ADL for nested
  53     // classes so they require these operators to be declared here instead of in
  54     // the global namespace.
  55     bool operator <(const QuotaInfo& rhs) const;
  56     bool operator ==(const QuotaInfo& rhs) const;
  57
  58     std::string host;
  59     int64 temporary_usage;
  60     int64 persistent_usage;
  61     int64 syncable_usage;
  62   };
  63
  64   typedef std::list<QuotaInfo> QuotaInfoArray;
  65   typedef base::Callback<void(const QuotaInfoArray&)> FetchResultCallback;
  66
  67   static BrowsingDataQuotaHelper* Create(Profile* profile);
  68
  69   virtual void StartFetching(const FetchResultCallback& callback) = 0;
  70
  71   virtual void RevokeHostQuota(const std::string& host) = 0;
  72
  73  protected:
  74   explicit BrowsingDataQuotaHelper(base::SingleThreadTaskRunner* io_thread_);
  75   virtual ~BrowsingDataQuotaHelper();
  76
  77  private:
  78   friend class base::DeleteHelper<BrowsingDataQuotaHelper>;
  79   friend struct BrowsingDataQuotaHelperDeleter;
  80   scoped_refptr<base::SingleThreadTaskRunner> io_thread_;
  81
  82   DISALLOW_COPY_AND_ASSIGN(BrowsingDataQuotaHelper);
  83 };
  84
  85 #endif  // CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_QUOTA_HELPER_H_