1// Copyright 2014 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_METRICS_SERVICE_ACCESSOR_H_
6#define CHROME_BROWSER_METRICS_METRICS_SERVICE_ACCESSOR_H_
7
8#include <stdint.h>
9
10#include "base/macros.h"
11
12namespace metrics {
13class MetricsService;
14}
15
16// This class limits and documents access to metrics service helper methods.
17// These methods are protected so each user has to inherit own program-specific
18// specialization and enable access there by declaring friends.
19class MetricsServiceAccessor {
20 protected:
21  // Constructor declared as protected to enable inheritance. Descendants should
22  // disallow instantiation.
23  MetricsServiceAccessor() {}
24
25  // Registers the specified synthetic field trial (identified by a hash of the
26  // trial name and group name) with |metrics_service|, if the service is not
27  // NULL, returning true on success.
28  // See the comment on MetricsService::RegisterSyntheticFieldTrial for details.
29  static bool RegisterSyntheticFieldTrial(
30      metrics::MetricsService* metrics_service,
31      uint32_t trial_name_hash,
32      uint32_t group_name_hash);
33
34 private:
35  DISALLOW_COPY_AND_ASSIGN(MetricsServiceAccessor);
36};
37
38#endif  // CHROME_BROWSER_METRICS_METRICS_SERVICE_ACCESSOR_H_
39