1// Copyright (c) 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 CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_REGISTRY_SYNCER_WIN_H_
6#define CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_REGISTRY_SYNCER_WIN_H_
7
8#include "base/timer/timer.h"
9
10namespace chrome_variations {
11
12// This class manages synchronizing active VariationIDs with the Google Update
13// experiment_labels value in the registry.
14class VariationsRegistrySyncer {
15 public:
16  VariationsRegistrySyncer();
17  ~VariationsRegistrySyncer();
18
19  // Starts a timer that, when it expires, updates the registry with the current
20  // Variations associated with Google Update. If the timer is already running,
21  // calling this just resets the timer.
22  void RequestRegistrySync();
23
24 private:
25  // Perform the actual synchronization process with the registry.
26  void SyncWithRegistry();
27
28  // A timer used to delay the writes to the registry. This is done to optimize
29  // the case where lazy-loaded features start their field trials some time
30  // after initial batch of field trials are created, and also to avoid blocking
31  // the UI thread. The timer effectively allows this class to batch together
32  // update requests, to avoid reading and writing from the registry too much.
33  base::OneShotTimer<VariationsRegistrySyncer> timer_;
34
35  DISALLOW_COPY_AND_ASSIGN(VariationsRegistrySyncer);
36};
37
38}  // namespace chrome_variations
39
40#endif  // CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_REGISTRY_SYNCER_WIN_H_
41