browsing_data_quota_helper.h revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
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/message_loop_proxy.h"
14#include "base/sequenced_task_runner_helpers.h"
15#include "webkit/quota/quota_types.h"
16
17class BrowsingDataQuotaHelper;
18class Profile;
19
20struct BrowsingDataQuotaHelperDeleter {
21  static void Destruct(const BrowsingDataQuotaHelper* helper);
22};
23
24// This class is an interface class to bridge between Cookies Tree and Unified
25// Quota System.  This class provides a way to get usage and quota information
26// through the instance.
27//
28// Call Create to create an instance for a profile and call StartFetching with
29// a callback to fetch information asynchronously.
30//
31// Parallel fetching is not allowed, a fetching task should start after end of
32// previous task.  All method of this class should called from UI thread.
33class BrowsingDataQuotaHelper
34    : public base::RefCountedThreadSafe<BrowsingDataQuotaHelper,
35                                        BrowsingDataQuotaHelperDeleter> {
36 public:
37  // QuotaInfo contains host-based quota and usage information for persistent
38  // and temporary storage.
39  struct QuotaInfo {
40    QuotaInfo();
41    explicit QuotaInfo(const std::string& host);
42    QuotaInfo(const std::string& host,
43              int64 temporary_usage,
44              int64 persistent_usage);
45    ~QuotaInfo();
46
47    // Certain versions of MSVC 2008 have bad implementations of ADL for nested
48    // classes so they require these operators to be declared here instead of in
49    // the global namespace.
50    bool operator <(const QuotaInfo& rhs) const;
51    bool operator ==(const QuotaInfo& rhs) const;
52
53    std::string host;
54    int64 temporary_usage;
55    int64 persistent_usage;
56  };
57
58  typedef std::list<QuotaInfo> QuotaInfoArray;
59  typedef base::Callback<void(const QuotaInfoArray&)> FetchResultCallback;
60
61  static BrowsingDataQuotaHelper* Create(Profile* profile);
62
63  virtual void StartFetching(const FetchResultCallback& callback) = 0;
64
65  virtual void RevokeHostQuota(const std::string& host) = 0;
66
67 protected:
68  explicit BrowsingDataQuotaHelper(base::MessageLoopProxy* io_thread_);
69  virtual ~BrowsingDataQuotaHelper();
70
71 private:
72  friend class base::DeleteHelper<BrowsingDataQuotaHelper>;
73  friend struct BrowsingDataQuotaHelperDeleter;
74  scoped_refptr<base::MessageLoopProxy> io_thread_;
75
76  DISALLOW_COPY_AND_ASSIGN(BrowsingDataQuotaHelper);
77};
78
79#endif  // CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_QUOTA_HELPER_H_
80