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 SYNC_UTIL_EXTENSIONS_ACTIVITY_H_
6#define SYNC_UTIL_EXTENSIONS_ACTIVITY_H_
7
8#include <map>
9#include <string>
10
11#include "base/basictypes.h"
12#include "base/memory/ref_counted.h"
13#include "base/synchronization/lock.h"
14#include "sync/base/sync_export.h"
15
16namespace syncer {
17
18// A storage to record usage of extensions APIs to send to sync
19// servers, with the ability to purge data once sync servers have
20// acknowledged it (successful commit response).
21class SYNC_EXPORT ExtensionsActivity
22    : public base::RefCountedThreadSafe<ExtensionsActivity> {
23 public:
24  // A data record of activity performed by extension |extension_id|.
25  struct SYNC_EXPORT Record {
26    Record();
27    ~Record();
28
29    // The human-readable ID identifying the extension responsible
30    // for the activity reported in this Record.
31    std::string extension_id;
32
33    // How many times the extension successfully invoked a write
34    // operation through the bookmarks API since the last CommitMessage.
35    uint32 bookmark_write_count;
36  };
37
38  typedef std::map<std::string, Record> Records;
39
40  ExtensionsActivity();
41
42  // Fill |buffer| with all current records and then clear the
43  // internal records. Called on sync thread to append records to sync commit
44  // message.
45  void GetAndClearRecords(Records* buffer);
46
47  // Merge |records| with the current set of records. Called on sync thread to
48  // put back records if sync commit failed.
49  void PutRecords(const Records& records);
50
51  // Increment write count of the specified extension.
52  void UpdateRecord(const std::string& extension_id);
53
54 private:
55  friend class base::RefCountedThreadSafe<ExtensionsActivity>;
56  ~ExtensionsActivity();
57
58  Records records_;
59  mutable base::Lock records_lock_;
60};
61
62}  // namespace syncer
63
64#endif  // SYNC_UTIL_EXTENSIONS_ACTIVITY_H_
65