| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef COMPONENTS_METRICS_METRICS_SERVICE_ACCESSOR_H_ |
| #define COMPONENTS_METRICS_METRICS_SERVICE_ACCESSOR_H_ |
| |
| #include <stdint.h> |
| |
| #include "base/macros.h" |
| |
| namespace metrics { |
| |
| class MetricsService; |
| |
| // This class limits and documents access to metrics service helper methods. |
| // These methods are protected so each user has to inherit own program-specific |
| // specialization and enable access there by declaring friends. |
| class MetricsServiceAccessor { |
| protected: |
| // Constructor declared as protected to enable inheritance. Descendants should |
| // disallow instantiation. |
| MetricsServiceAccessor() {} |
| |
| // Registers the specified synthetic field trial (identified by a hash of the |
| // trial name and group name) with |metrics_service|, if the service is not |
| // NULL, returning true on success. |
| // See the comment on MetricsService::RegisterSyntheticFieldTrial for details. |
| static bool RegisterSyntheticFieldTrial( |
| MetricsService* metrics_service, |
| uint32_t trial_name_hash, |
| uint32_t group_name_hash); |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(MetricsServiceAccessor); |
| }; |
| |
| } // namespace metrics |
| |
| #endif // COMPONENTS_METRICS_METRICS_SERVICE_ACCESSOR_H_ |